Linear Technology DC1500A Guida rapida alla configurazione

dc1500af

DEMO MANUAL DC1500A

DESCRIPTION

LTC2393-16/LTC2392-16/

LTC2391-16: 16-Bit,1Msps/

0.5Msps/0.25Msps

Low Noise ADCs

The LTC

2393/LTC2392/LTC2391-16 are low noise high

speed ADCs with both parallel and serial outputs that

can operate from a single 5V supply. The following text

refers to the LTC2393-16 but applies to all three parts.

The only difference being the maximum sample rates. The

LTC2393-16 supports alarge ±4.096V fullydifferential input

range. This makes it ideal for high performance applica-

tions that requiremaximum dynamic range. Demonstration

circuit 1500A provides the user a means of evaluating the L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear

Technology Corporation. All other trademarks are the property of their respective owners.

performance of the LTC2393-16 in both parallel and serial

modes and is intended to demonstrate recommended

grounding, component placement and selection, routing

and bypassing for this ADC. Also several suggested driver

circuits for the analog inputs will be presented.

Design ﬁles for this circuit board are available at www.

linear.com/demo.

Table 1

ASSEMBLY VERSION PART NUMBER MAX CONVERSION RATE

MAX PARALLEL CLK IN

FREQUENCY

MAX SERIAL CLK IN

FREQUENCY

DC1500A-A LTC2393CLX-16 1Msps 1MHz 80MHz

DC1500A-B LTC2392CLX-16 0.5Msps 500kHz 40MHz

DC1500A-C LTC2391CLX-16 0.25Msps 250kHz 20MHz

Figure 1. DC1500A Connection Diagram

CLK_IN

1MHz MAX

(80MHz FOR SERIAL)

3.3VP-P MAX

DC718

–9V

dc1500a F01

GND 9V

AIN–

0V TO 4.096V MAX

(NOT NEEDED UNLESS

U2 IS DISABLED)

AIN+

0V TO 4.096V MAX

dc1500af

DEMO MANUAL DC1500A

QUICK START PROCEDURE

Check to make sure that all switches and jumpers are

set as shown in the connection diagram of Figure 1. The

default connections conﬁgure the ADC for parallel op-

eration with the output data in offset binary format. The

analog input is AC-coupled and the internal reference of

the ADC is used.

Connect DC1500A to a DC718B/C USB High Speed Data

Collection Board using connector J1. Connect DC718B/C

to a host PC with a standard USB A/B cable. Apply ±9V

to the indicated terminals. Apply a low jitter signal source

to J3 (AIN+). The default setup uses a single ended to dif-

ferential converter so that it is only necessary to apply an

input signal to J3. Connect a low jitter 1MHz 3.3VP-P sine

wave or square wave to connector J2 (CLK). Note that J2

has a 50Ω termination resistor to ground.

Run the QuickEval-II software (Pscope.exe version K66

or later) supplied with DC718B/C or download it from

www.linear.com.

Complete software documentation is available from the

Help menu. Updates can be downloaded from the Tools

menu. Check for updates periodically as new features

may be added.

The Pscope software should recognize DC1500A and

conﬁgure itself automatically.

Click the Collect button (see Figure 6) to begin acquiring

data. The Collect button then changes to Pause, which

can be clicked to stop data acquisition.

DC Power

DC1500A requires ±9VDC at approximately 100mA. Most

of the supply current is consumed by the CPLD, op amps,

regulators and discreet logic on the board. The ±9VDC

input voltage powers the ADC through LT1763 regulators

which provide protection against accidental reverse bias.

Additional regulators provide power for the CPLD and op

amps. See Figure 1 for connection details.

Clock Source

You must provide a low jitter 3.3VP-P sine or square wave

to J2. The clock input is AC-coupled so the DC level of the

clock signal is not important. A generator like the HP8644

or similar is recommended.Even a good generatorcan start

to produce noticeable jitter at low frequencies. Therefore

it is recommended for lower sample rates to divide down

a higher frequency clock to the desired sample rate. One

way to do this is by placing the ADC in the serial mode.

This can be accomplished by setting the SER/PARL posi-

tion of SW1 to the high position. In the serial mode the

ratio of clock frequency to conversion rate is 80:1. In

the parallel mode there is a 1:1 ratio of clock frequency

to conversion rate. If the clock input is to be driven with

logic, it is recommended that the 50Ω terminator (R17)

be removed. Slow rising edges may compromise SNR of

the converter in the presence of high amplitude higher

frequency input signals.

Data Output

Parallel data output from this board (0V to 3.3V default),

if not connected to DC718, can be acquired by a logic

analyzer, and subsequently imported into a spreadsheet, or

mathematical package depending on what form of digital

signal processing is desired. Alternatively, the data can be

fed directly into an application circuit. Use pin 3 of J1 to

latch the data. The data can be latched using either edge

of this signal. The data output signal levels at J1 can also

be reduced to 0V to 2.5V if the application circuit cannot

tolerate the higher voltage. Thisis accomplished by moving

JP7 to the 2.5V position.

Reference

JP4, JP5 and JP6 allow you to select an on chip refer-

ence or an external LT1790A-4.096 as the reference. The

worst case initial accuracy and drift speciﬁcations of the

external reference are better than the on chip reference.

To use the internal reference set JP6 to FLT, JP4 to ADC

and JP5 to REFIN. To use the LT1790A-4.096 set JP5 and

JP6 to GND and JP4 to EXT.

SETUP

dc1500af

DEMO MANUAL DC1500A

SETUP

Figure 2. Single-Ended to Differential Driver

249

AIN

0V TO 4.096V

249

R51

49.9

R52

49.9

0.002µF

NPO

C53

10µF

LTC2393-16

dc1500a F02

–

LT6350

VCM

Analog Input

The default driver for the analog inputs of the LTC2393-16

on DC1500A is shown in Figure 2. This circuit converts a

single-ended 0V to 4.096V input signal applied at AIN into

a differential signal with a swing of ±4.096V between the

+IN and –IN inputs of the ADC. In addition this circuit band

limits the input frequenciesto approximately 100kHz which

is the useful linear bandwidth of the LTC2393-16.

Alternatively, if your application circuit produces a dif-

ferential signal which can drive the ADC but you need to

level shift the input signal, the circuits of Figure 3 and

Figure 4 can be used. The circuit of Figure 3 AC-couples

the input signal and is usable down to about 10kHz. The

lower frequency limit can be extended by increasing C37

and C51. The circuit of Figure 3 can be implemented on

DC1500A by putting JP1 and JP3 in the AC position and

moving R2 and R3 to the R50 and R53 positions. At this

point it will be necessary to drive both AIN+and AIN–. One

of these RC pairs can be attached to the input of the circuit

in Figure 2. This allows a single-ended input signal to be

level shifted. This is the default condition for DC1500A.

One of the most asked for ADC driver circuits is one that

allows the input voltage to go below ground with a single

supply ADC. Figure 4’s input driver allows the input volt-

age range to go below ground. It DC-couples and level

shifts the analog input at the expense of attenuating the

input level by a factor of 2. The circuit of Figure 4 can be

implemented on DC1500A by setting VCM to External and

biasing the external pin to 4.096V. Then replace R1 and

R6 with 1k, put JP1 and JP3 in the DC position and move

R2 and R3 to the R50 and R53 positions.

Data Collection

For SINAD, THD or SNR testing a low noise, low distortion

generatorsuchastheB&KType 1051 or Stanford Research

DS360 should be used. A low jitter RF oscillator such as

the HP8644 is used as the clock source.

This demo board is tested in house by attempting to

duplicate the FFT plot shown on the front page of the

LTC2393-16 data sheet. This involves using a 1MHz clock

source, along with a sinusoidal generator at a frequency

of 20kHz. The input signal level is approximately –1dBfs.

The input is ﬁltered with a 20kHz single pole RC ﬁlter

shown in Figure 5. The FFT shown in the data sheet is a

16384-point FFT. A typical FFT obtained with DC1500A is

shown in Figure 6. Note that to calculate the real SNR, the

signal level (F1 amplitude = –1.117dB) has to be added

back to the SNR that PScope displays. With the example

shown in Figure 6, this means that the actual SNR would

be 94.237dB instead of the 93.12dB that PScope displays.

Taking the RMS sum of the recalculated SNR and the THD

yields a SINAD of 93.68 dB which is fairly close to the

typical value for this ADC.

There are a number of scenarios that can produce

misleading results when evaluating an ADC. One that is

common is feeding the converter with a frequency, that

is a sub-multiple of the sample rate, and which will only

exercise a small subset of the possible output codes. The

proper method is to pick an M/N frequency for the input

sine wave frequency. N is the number of samples in the

FFT. M is a prime number between one and N/2. Multiply

M/N by the sample rate to obtain the input sine wave

frequency. Another scenario that can yield poor results

is if you do not have a signal generator capable of ppm

levels of frequency accuracy or if it cannot be slaved to the

clock frequency. You can use an FFT with windowing to

reduce the “leakage” or spreading of the fundamental, to

get a close approximation of the ADC performance. If an

ampliﬁer or clock source with poor phase noise is used,

the windowing will not improve the SNR.

dc1500af

DEMO MANUAL DC1500A

SETUP

Layout

As with any high performance ADC, this part is sensitive

to layout. The area immediately surrounding the ADC on

DC1500A should be used as a guideline for placement,

and routing of the various components associated with the

ADC. Here are some things to remember when laying out

a board for the LTC2393-16. A ground plane is necessary

to obtain maximum performance. Keep bypass capaci-

tors as close to supply pins as possible. Use individual

low impedance returns for all bypass capacitors. Use of a

symmetrical layout around the analog inputs will minimize

the effects of parasitic elements. Shield analog input traces

with ground to minimize coupling from other traces. Keep

traces as short as possible.

R50

249

AIN+

0V TO 4.096V

AIN–

0V TO 4.096V

VCM

(PIN 36)

VCM

(PIN 36)

+IN

(PIN 43)

–IN

(PIN 42)

R53

249

R51

49.9

R52

49.9

2200pF

NPO

C37

10µF

C51

10µF

R37

dc1500a F03

R30

Figure 3. AC-Coupled Differential Driver

Component Selection

When driving a low noise, low distortion ADC such as

the LTC2393-16, component selection is important so

as to not degrade performance. Resistors should have

low values to minimize noise and distortion. Metal ﬁlm

resistors are recommended to reduce distortion caused

by self heating. Because of their low voltage coefﬁcients,

which can reduce distortion NPO or silver mica capacitors

should be used. Any buffer used to drive the LTC2393-16

should have low distortion, low noise and a fast settling

time such as the LT6350.

R50

249

AIN+

–4.096V

4.096V

AIN–

–4.096V

4.096V

+IN

(PIN 43)

–IN

(PIN 42)

R53

249

R51

49.9

R52

49.9

2200pF

NPO

R37

dc1500a F04

R30

Figure 4. DC-Coupled Differential Driver

Figure 5. 20kHz RC Filter

0.033µF

TO J3

FROM SINE

GENERATOR

dc1500a F05

249

dc1500af

DEMO MANUAL DC1500A

SETUP

MISCELLANEOUS DIP SWITCHES AND JUMPERS

Figure 6. Pscope Screenshot

Deﬁnitions

JP2: VCM sets the DC bias for AIN+and AIN–when the

inputs are AC-coupled. INT is the default position.

SW1:

SER_PARL: Selects serial or parallel operation. Default

position is parallel. In parallel mode fS= fCLK. In serial

mode fS= fCLK/80.

OB/2CL:Selects offset binaryor two’scomplement data for-

mat for ADC output word. The default is offset binary.

CSL: This pin must be kept low for normal operation.

RDL: This pin must be kept low for normal operation.

dc1500af

DEMO MANUAL DC1500A

PARTS LIST

ITEM QUANTITY REFERENCE DESIGNATOR DESCRIPTION MANUFACTURERS PART NUMBER

1 0 C1, C9, C39, C52, C54, C55, C56 Capacitor, 0603 OPT

2 1 C2 Capacitor, NP0, 2200pF, 25V, 5% 1206 AVX, 12063A222JAT2A

3 9 C10, C18, C20, C22, C28, C30, C37,

C51, C53

Capacitor, X5R, 10F, 6.3V, 20% 0603 Taiyo Yuden, JMK107BJ106MA (2rls, PbF)

4 13 C11, C27, C29, C31, C32, C34, C35,

C38, C50, C57, C59, C60, C63

Capacitor, X7R, 0.1F, 25V, 10% 0603 AVX, 06033C104KAT2A

5 11 C12, C16, C23, C24, C25, C33, C36,

C41, C58, C61, C62

Capacitor, X7R, 1F, 16V, 10% 0603 AVX, 0603YC105KAT2A

6 2 C13, C14 Capacitor, X5R, 10F, 10V, 20% 0805 Taiyo Yuden, LMK212BJ106MG

7 4 C15, C17, C19, C21 Capacitor, X7R, 0.01F, 50V, 10% 0603 AVX, 06035C103KAT2A

8 1 C26 Capacitor, X5R, 47F, 16V, 20% 1210 Taiyo Yuden, EMK325BJ476MM

9 1 C40 Capacitor, X5R, 4.7F, 4V, 20% 0402 Taiyo Yuden, AMK105BJ475MV-F

10 8 C42, C43, C44, C45, C46, C47, C48,

C49

Capacitor, X5R, 0.1F, 10V, 10% 0402 AVX, 0402ZD104KAT2A

11 9 E1, E2, E3, E4, E5, E6, E7, E8, E9 Test Point, Turret, .064" Mill-Max, 2308-2-00-80-00-00-07-0

12 6 JP1, JP2, JP3, JP4, JP5, JP6 JMP, 1 ×3, 0.1" Samtec, TSW-103-07-L-S

13 6 Shunts On JP1 to JP6 Pins 1 and 2 Shunt, 0.1" Center Samtec, SNT-100-BK-G

14 1 JP7 JMP, 1 ×3, 0.079CC Samtec, TMM-103-02-L-S

15 1 Shunt On JP7 Pins 1 and 2 Shunt, 0.079" Center Samtec, 2SN-BK-G

16 1 JTAG Header, 2 ×5, 0.1" Samtec, TSW-105-07-L-D

17 1 J1 Header, 0.1 ×0.1 CNTRS, 40 Pin Samtec, TSW-120-07-L-S

18 3 J2, J3, J4 Connection, BNC, 5 Pins Connex, 112404

19 3 R1, R4, R6 Resistor, Chip, 0, 1/10W, 0603 Vishay, CRCW06030000Z0EA

20 2 R2, R3 Resistor, Chip, 249, 1/10W, 1% 0603 Vishay, CRCW0603249RFKEA

21 1 R7 Resistor, Chip, 499, 1/10W, 1% 0603 Vishay, CRCW0603499RFKEA

22 3 R8, R9, R10 Resistor, Chip, 4.99k, 1/10W, 1% 0603 Vishay, CRCW06034K99FKEA

23 9 R11, R12, R14, R16, R18, R19,

R28, R30, R37

Resistor, Chip, 1k, 1/10W, 5% 0603 Vishay, CRCW06031K00JNEA

24 2 R13, R15 Resistor, Chip, 3.92k, 1/10W, 1% 0603 Vishay, CRCW06033K92FKEA

25 1 R17 Resistor, Chip, 49.9, 1/4W, 1% 1206 Vishay, CRCW120649R9FKEA

26 3 R20, R22, R49 Resistor, Chip, 33, 1/10W, 5% 0603 Vishay, CRCW060333R0JNEA

27 1 R24 Resistor, Chip, 1, 1/10W, 5% 0603 Vishay, CRCW06031R00JNEA

28 1 R25 Resistor, Chip, 1.69k, 1/10W, 1% 0603 Vishay, CRCW06031K69FKEA

29 1 R26 Resistor, Chip, 1.54k, 1/10W, 1% 0603 Vishay, CRCW06031K54FKEA

30 1 R27 Resistor, Chip, 2.80k, 1/10W, 1% 0603 Vishay, CRCW06032K80FKEA

31 0 R29, R36, R38, R50, R53, R55 Resistor, Chip, 0603 OPT

32 4 R31, R32, R33, R34 Resistor, Chip, 1k, 1/16W, 5% 0402 Vishay, CRCW04021K00JNED

33 5 R35, R40, R41, R42, R43 Resistor, Chip, 10k, 1/16W, 5% 0402 Vishay, CRCW040210K0JNED

34 4 R45, R46, R47, R48 Resistor, Chip, 300, 1/16W, 5% 0402 Vishay, CRCW0402300RJNED

35 2 R51, R52 Resistor, Chip, 49.9, 1/16W, 1% 0402 Vishay, CRCW040249R9FKED

36 1 R54 Resistor, Chip, 10k, 1/10W, 5% 0603 Vishay, CRCW060310K0JNEA

LTC23xxCLX Family, DC1500A-1 General BOM

dc1500af

DEMO MANUAL DC1500A

PARTS LIST

ITEM QUANTITY REFERENCE DESIGNATOR DESCRIPTION MANUFACTURERS PART NUMBER

37 1 SW1 Switch, 219-4MST CTS Electronic Components, 219-4MST

38 1 U2 IC., LT6350CMS8, MS8 Linear Tech., LT6350CMS8

39 1 U4 IC., 24LC025, TSSOP-8 Microchip, 24LC025-T/ST

40 1 U5 IC., LT1790ACS6-4.096, SOT23-6 Linear Tech., LT1790ACS6-4.096#PBF

41 1 U6 IC., LT1763CS8-1.8, SO8 Linear Tech., LT1763CS8-1.8#PBF

42 2 U7, U9 IC., LT1763CS8, SO8 Linear Tech., LT1763CS8#PBF

43 1 U8 IC., LT1763CS8-5, SO8 Linear Tech., LT1763CS8-5#PBF

44 1 U10 IC., LT1964ES5-SD, SOT23-5 Linear Tech., LT1964ES5-SD#PBF

45 1 U12 IC., NL17SZ74, US8 On Semi., NL17SZ74USG

46 1 U13 IC., NC7ST04P5X, SC70-5t Fairchild, NC7ST04P5X

47 1 U14 IC., EPM240GT100C5N, TQFP100 Altera Corp., EPM240GT100C5N

48 1 U15 IC., NC7SZ04P5X, SC70-5 Fairchild, NC7SZ04P5X

49 1 U16 IC., NC7SVU04P5X, SC70-5 Fairchild, NC7SVU04P5X

50 4 Stand-Off at 4 Corners Stand-Off, Nylon 0.25" Keystone, 8831(SNAP ON)

51 1 Stencil for Top Side Only DC1500A-1

LTC2393CLX Family, Demo Circuit 1500A-A

ITEM QUANTITY REFERENCE DESIGNATOR DESCRIPTION MANUFACTURERS PART NUMBER

1 1 DC1500A-1 General BOM

2 1 U1 IC., LTC2393CLX-16, LQFP48-7X7 Linear Tech., LTC2393CLX-16#PBF

LTC2392CLX-16, Demo Circuit 1500A-B

ITEM QUANTITY REFERENCE DESIGNATOR DESCRIPTION MANUFACTURERS PART NUMBER

1 1 DC1500A-1 General BOM

2 1 U1 IC., LTC2392CLX-16, LQFP48-7X7 Linear Tech., LTC2392CLX-16#PBF

LTC2391CLX-16, Demo Circuit 1500A-C

ITEM QUANTITY REFERENCE DESIGNATOR DESCRIPTION MANUFACTURERS PART NUMBER

1 1 DC1500A-1 General BOM

2 1 U1 IC., LTC2391CLX-16, LQFP48-7X7 Linear Tech., LTC2391CLX-16#PBF

dc1500af

DEMO MANUAL DC1500A

SCHEMATIC DIAGRAM

D D

C C

B B

A A

OB/2CL

80MHz MAX

CLK

3.3VPP

AIN+

0V - 4.096V

AIN-

0V - 4.096V

SER_PARL

VCM

EXT

INT

REFSNS

GND

REFIN

EXT ADC

REFOUT

REFIN GND

+COUPLING

EXT_VCM

CSL

RDL

HIGHLOW

FLT

1. ALL RESISTORS ARE IN OHMS, 0603.

ALL CAPACITORS ARE IN MICROFARADS, 0603

NOTES: UNLESS OTHERWISE SPECIFIED

-COUPLING

YES

-AIN

-B

-C

LTC2392CLX-16

LTC2391CLX-16

0.5

0.25

Msps

J2 SHUNT

FULLY DIFFERENTIAL

YES -AIN-A

ASSY

LTC2393CLX-16

BITS

VREF

+3.3V

+5V

V+

V-

V+

+5V

+3.3V

BUSY

D17

D16

D15

D14

D13/SCLK

D12/SDOUT

D11/SDIN

D10

BYTESWAP_D1/A1

GND_D0/A0

CLK

CNVSTL

VCM_BIAS

SER_PARL

16_18L

CNVST_33

DB16

DB17

CLKOUT

DB5

DB6

DB7

DB8

DB9

DB10

DB11

DB12

DB13

DB14

DB15

DB0

DB1

DB2

DB3

DB4

VCM

OB2C

SER_PARL_MODE0

GND_MODE1

VCM

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

GUY H.PRODUCTION

103-24-10

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

GUY H.PRODUCTION

103-24-10

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

GUY H.PRODUCTION

103-24-10

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

DEMO CIRCUIT 1500A

Wednesday, March 24, 2010 1

GUY H.

LOW NOISE HIGH SPEED SAR ADC FAMILY

LTC23XXCLX FAMILY

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

DEMO CIRCUIT 1500A

Wednesday, March 24, 2010 1

GUY H.

LOW NOISE HIGH SPEED SAR ADC FAMILY

LTC23XXCLX FAMILY

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

DEMO CIRCUIT 1500A

Wednesday, March 24, 2010 1

GUY H.

LOW NOISE HIGH SPEED SAR ADC FAMILY

LTC23XXCLX FAMILY

2200pF

NP0

1206

2200pF

NP0

1206

JP3JP3

R11

C31

0.1uF

C31

0.1uF

C52

OPT

C52

OPT

R37

R24

1.0

R24

1.0

U15

NC7SZ04P5X

U15

NC7SZ04P5X

J2J2

C38

0.1uF

C38

0.1uF

10k, 0402 X 4 PLCS10k, 0402 X 4 PLCS

R10

4.99k

R10

4.99k

C53

10uF

6.3V

C53

10uF

6.3V

249

C40

4.7uF

0402

C40

4.7uF

0402

OPT

R45 - R48R45 - R48

JP4JP4

U1B

OGND

GND

AVP/AVL

AVP

DVP

DVP/DVL

OVP

GND

R38

OPT

R38

OPT

R54

10k

R54

10k

R12

C27

0.1uF

C27

0.1uF

C59

0.1uF

C59

0.1uF

HD2X20-100SMT-TB

15 14

JP1JP1

C33

1uF

C33

1uF

24LC025-I /ST

SDA

VCC

VSS

SCL

R55

OPT

R55

OPT

LT6350CMS8

OUT2

+IN1

-IN1

+IN2

V+

OUT1

SHDN

V-

U12

NL17SZ74

U12

NL17SZ74

CLR

VCC

GND

JP6JP6

C56

OPT

C56

OPT

LT1790ACS6-4.096

VIN

GND

VOUT

C37

10uF

6.3V

C37

10uF

6.3V

C60

0.1uF

C60

0.1uF

R19

C50

0.1uF

C50

0.1uF

E1E1

C35

0.1uF

C35

0.1uF

U16

NC7SVU04P5X

U16

NC7SVU04P5X

R18

C32

0.1uF

C32

0.1uF

C51

10uF

6.3V

C51

10uF

6.3V

JP5JP5

C10

10uF

6.3V

C10

10uF

6.3V

C28

10uF

6.3V

C28

10uF

6.3V

C29

0.1uF

C29

0.1uF

C36

1uF

C36

1uF

R52

0402

49.9

R52

0402

49.9

U13

NC7ST04P5X

U13

NC7ST04P5X

C11

0.1uF

C11

0.1uF

OPT

R36

OPT

R36

OPT

R50

OPT

R50

OPT

4.99k

300, 0402 X 4 PLCS300, 0402 X 4 PLCS

C55

OPT

C55

OPT

R51

0402

49.9

R51

0402

49.9

C54

OPT

C54

OPT

4.99k

C34

0.1uF

C34

0.1uF

C58

1uF

C58

1uF

C63

0.1uF

C63

0.1uF

R49

R30

C62

1uF

C62

1uF

J3J3

C41

1uF

C41

1uF

C39

18pF

C39

18pF

J4J4

1234

SW1

219-4MST

1234

SW1

219-4MST

C61

1uF

C61

1uF

R29

OPT

R29

OPT

249

U1A

SER_PARL_MODE0

GND_MODE1

OB/2CL

D0/A0

D1/A1

D10

D11/SDIN

D12/SDOUT

D13/SCLK

D14

D15

D16

D17

BUSY

RDL

CSL

RESET

CNVSTL

REFOUT

REFIN

REFSENSE

-IN

+IN

VCM

R28

R53

OPT

R53

OPT

R40 - R43R40 - R43

C57

0.1uF

C57

0.1uF

JP2JP2

R17

49.9

1206

R17

49.9

1206

C30

10uF

6.3V

C30

10uF

6.3V

499

R22

R20

dc1500af

DEMO MANUAL DC1500A

SCHEMATIC DIAGRAM

D D

C C

B B

A A

-9V/-10VIN V-

OPAMP

VCCINT

VCCIO

ADC_LOGIC

+9V/+10VIN +1.8V

VCCIO

+3.3V

+2.5V

+3.3V

+5V

GND

CNTRL

POWER

V+

-9V_IN V-

+3.3V +1.8V

+9V_IN

+3.3V

+1.8V

+3.3V

+5V

V+

D14

D13/SCLK

D15

D16

BUSY

D11/SDIN

D17

D10

D12/SDOUT

BYTESWAP_D1/A1

GND_D0/A0

SER_PARL_MODE0

OB2C

GND_MODE1

SER_PARL

16_18L

DB0

DB8

DB14

DB1

DB10

DB6

DB13

DB12

DB5

DB7

DB11

CLKOUT

DB15

DB4

DB2

DB9

DB3 CLK

DEV_OE

DEV_CLRN

CNVST_33

DB16

DB17

SIZE

DATE:

IC NO.

REV

SHEET OF

TITLE:

CONTRACT NO.

APPROVALS

PCB DES.

ENG.

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

DEMO CIRCUIT 1500A

Tuesday, December 01, 2009 2

K. TRAN

G. HOOVER

LOW NOISE HIGH SPEED SAR ADC FAMILY

LTC23XXCLX FAMILY

SCALE: NONE

SIZE

DATE:

IC NO.

REV

SHEET OF

TITLE:

CONTRACT NO.

APPROVALS

PCB DES.

ENG.

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

DEMO CIRCUIT 1500A

Tuesday, December 01, 2009 2

K. TRAN

G. HOOVER

LOW NOISE HIGH SPEED SAR ADC FAMILY

LTC23XXCLX FAMILY

SCALE: NONE

SIZE

DATE:

IC NO.

REV

SHEET OF

TITLE:

CONTRACT NO.

APPROVALS

PCB DES.

ENG.

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

DEMO CIRCUIT 1500A

Tuesday, December 01, 2009 2

K. TRAN

G. HOOVER

LOW NOISE HIGH SPEED SAR ADC FAMILY

LTC23XXCLX FAMILY

SCALE: NONE

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

G. HOOVER1ST PROTOTYPE

112-01-09

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

G. HOOVER1ST PROTOTYPE

112-01-09

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

G. HOOVER1ST PROTOTYPE

112-01-09

E7E7

LT1763CS8-5

OUT

SEN

GND

BYP

SHDN

GND

E3E3

E9E9

1k, 0402 X 3 PLCS1k, 0402 X 3 PLCS

C21

0.01uF

C21

0.01uF

R35

0402

10k

R35

0402

10k

U10

LT1964ES5-SD

U10

LT1964ES5-SD

GND

ADJ

SHDN

OUT

E6E6

U14A

EPM240T

U14A

EPM240T

IO1

IO2

IO3

IO4

IO5

IO6

IO7

IO8

IO15

IO16

IO17

IO18

IO19

IO20

IO21

D2D2

U14D

EPM240T

U14D

EPM240T

IO76

IO77

IO78

IO81

IO82

IO83

IO84

IO85

IO86

IO87

IO88

IO89

IO90

IO91

IO92

IO95

IO96

IO97

IO98

IO99

IO100

100

D11D11

D8D8

D3D3

E4E4

C24

1uF

16V

C24

1uF

16V

C17

0.01uF

C17

0.01uF

D5D5

C12

1uF

16V

C12

1uF

16V

U14E

EPM240T

U14E

EPM240T

GCLK0

GCLK1

GCLK2

GCLK3

DEV_OE

DEV_CLRN

TMS

TDI

TCK

TDO

C18

10uF

6.3V

C18

10uF

6.3V

R15

3.92k

R15

3.92k

U14B

EPM240T

U14B

EPM240T

IO26

IO27

IO28

IO29

IO30

IO33

IO34

IO35

IO36

IO37

IO38

IO39

IO40

IO41

IO42

IO47

IO48

IO49

IO50

D16D16

LT1763CS8-1.8

OUT

SEN

GND

BYP

SHDN

GND

R25

1.69k

R25

1.69k

D12D12

R16

JP7JP7

R27

2.80k

R27

2.80k

C25

1uF

16V

C25

1uF

16V

D6D6

D17D17

C13

10uF

0805

10V

C13

10uF

0805

10V

C20

10uF

6.3V

C20

10uF

6.3V

C19

0.01uF

C19

0.01uF

U14C

EPM240T

U14C

EPM240T

IO51

IO52

IO53

IO54

IO55

IO56

IO57

IO58

IO61

IO66

IO67

IO68

IO69

IO70

IO71

IO72

IO73

IO74

IO75

C14

10uF

0805

10V

C14

10uF

0805

10V

E5E5

E8E8

BUSYBUSY

R14

C44 - C49

0402

C44 - C49

0402

D15D15

D0D0

JTAG

HD2X5-100

JTAG

HD2X5-100

D9D9

D7D7

LT1763CS8

OUT

SEN

GND

BYP

SHDN

GND

E2E2

C43C43

D14D14

LT1763CS8

OUT

SEN

GND

BYP

SHDN

GND

D1D1

C15

0.01uF

C15

0.01uF

D13D13

U14F

EPM240T

U14F

EPM240T

VCCINT

VCCIO1

VCCIO2

VCCIO1

VCCIO2

GND

R26

1.54k

R26

1.54k

0.1uF0.1uF

D10D10

D4D4

C16

1uF

16V

C16

1uF

16V

C26

47uF

1210

16V

C26

47uF

1210

16V

R31 - R33R31 - R33

R13

3.92k

R13

3.92k

C22

10uF

6.3V

C22

10uF

6.3V

C42

0402

0.1uF

C42

0402

0.1uF

R34

0402

R34

0402

C23

1uF

16V

C23

1uF

16V

dc1500af

DEMO MANUAL DC1500A

ASSEMBLY DRAWINGS

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