Linear DC1339 Manuale utente

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1339

LOW NOISE, 500KSPS, 12-BIT ADC

DESCRIPTION

LTC2302

Demonstration circuit 1339 features the

LTC2302 low noise, 500ksps, 12-Bit, ADC.

The LTC2302 has an SPI compatible serial

interface that can be used to select channel

polarity and unipolar or bipolar settings.

DC1339A demonstrates the DC and AC

performance of the LTC2302 in conjunction

with the DC590B QuikEval and DC890B Fast

DAACS data collection boards. Use DC590B

to demonstrate DC performance such as

peak-to-peak noise and DC linearity. Use

DC890B if precise sampling rates are required

or to demonstrate AC performance such as

SNR, THD, SINAD and SFDR. Alternatively,

by connecting the DC1339A into a customer

application, the performance of the LTC2302

can be evaluated directly in that circuit.

Design files for this circuit board are

available. Call the LTC factory.

LTC is a trademark of Linear Technology Corporation

Figure 1. DC1339A Connection Diagram

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1339

LOW NOISE, 500KSPS, 12-BIT ADC

DC890B QUICK START PROCEDURE

Connect DC1339A to a DC890B USB High

Speed Data Collection Board using connector

J2. Connect DC890B to a host PC with a

standard USB A/B cable. Apply 6V-9V DC to

the 6V-9V and GND terminals. Apply a low

jitter signal source to IN+ on connector J1.

Apply a low jitter clock with a maximum

frequency of 40MHz to connector J3. The clock

can be a sine wave or square wave with

maximum amplitude of 14dBm. Note that J3

has a 50Ωtermination resistor to ground,

which will prevent most logic from driving this

pin directly. Run the Fast DAACS software

(Pscope.exe version K51 or later) supplied with

DC890B 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.

PSCOPE SOFTWARE CONFIGURATION

The Pscope software will recognize DC1339A

and configure itself automatically. The default

configuration is for IN+ with respect to IN- in

unipolar mode. Make sure that the jumpers are

set as shown in Figure 2. If bipolar mode is

desired, it will be necessary to change the

Pscope ADC configuration setting as well as

jumpers JP3 and JP5. From the front page of

the software select ADC Configuration from

the Configure menu. Select 12-Bits,

Alignment 12, FPGA Ld Serial 2308 Class, 1-

Channel. Do not check Positive Edge Clk.

Check Bipolar if the JP5 UNI jumper is set to

GND. An example of the ADC configuration

menu is shown in Figure 3. JP3 should be

changed from GND to VREF/2 in bipolar

mode, so that the minus input is biased

halfway between ground and Vref.

Click the Collect button (See Figure 4) to

begin acquiring data. Depending on which

board was previously used by Pscope it may

be necessary to press Collect a second time.

The Collect button then changes to Pause,

which can be used to pause data acquisition.

Figure 2. Jumper Settings

Figure 3. User Configure Menu

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1339

LOW NOISE, 500KSPS, 12-BIT ADC

DC590B QUICK START PROCEDURE

Connect DC1339A to a DC590 USB serial

controller using the supplied 14-conductor

ribbon cable. Connect DC590 to a host PC

with a standard USB A/B cable. Run the

evaluation software supplied with DC590 or

download it from www.linear.com. The correct

control panel will be loaded automatically.

Version K73 of QuikEval or higher should be

used for this board. Click the COLLECT button

to begin reading the ADC. Change the range

(unipolar or bipolar) by right clicking over the

range indicator in the display. See Figure 5.

HARDWARE SET UP

SIGNAL CONNECTIONS

J1 SMA connector for IN+. Limit input swings

to 0V-4.096V. For optimum performance, the

input should be band limited to the frequencies

of interest. See schematic for details.

J2 FastDAACS interface to DC890B. Do not

use J4 at the same time.

J3 Conversion Clock Input. This input has a

50Ωtermination resistor, and is intended to be

driven by a 14dBm sine or square wave. To

achieve full AC performance of this part, the

clock jitter should be kept under 20ps. This

input is capacitively coupled to a clock buffer

so that level shifting is not required. To run at

maximum conversion rate, apply a 40MHz

signal to this connector. J3 is used only for

DC890B. DC590B generates its own clock

signal.

J4 Quick Eval interface to DC590B. Do not use

J2 at the same time. This connector can also

be used to drive the ADC directly. See

schematic for details.

JUMPERS

JP1 (OVDD) connects the OVDD pin of the

ADC to 5V or to an external voltage. The SDO

pin swings from ground to OVDD.

JP2 contains CONV, SDI, SCK and a buffered

SDO signal. This connector is intended to

monitor these signals. For for those who want

to drive the ADC directly use J4.

JP3 (IN-) selects whether the IN- pin of the

ADC is to be cleanly grounded near the ADC or

connected to VREF/2.

JP4 (VREF) selects onboard or external

reference for the ADC

JP5 (DIN Word) selects the channel

configuration and unipolar/bipolar settings of

the ADC. (JP5 is used by the DC890B only. It

is ignored by the DC590B.)

GROUNDING AND POWER CONNECTION

Connect a 6V to 9V power supply to the 6-

9VDC and GND posts when using DC890B. If

the DC590B is used it will provide power to the

DC1339.

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1339

LOW NOISE, 500KSPS, 12-BIT ADC

Figure 4. DC1339A Pscope Screenshot

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1339

LOW NOISE, 500KSPS, 12-BIT ADC

Figure 5. DC1339A QuikEval Screen Shot

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1339

LOW NOISE, 500KSPS, 12-BIT ADC

C14

1uF

C33

0.1uF

3.01K

E10

GND

49.9

(Opt)

LT1790ACS6 4.096

VOUT

GNDGND

VIN

DNCDNC

C34

0.1uF

SN74AHCT1G04DCKT

0.1uF

CONV_AT_ADC

2.5V

C12

1uF

IN+

0V 4.096V

1uF

16V

VREF

10uF

6.3V

MUX

EXPOSED

CONVST

SDO

SCK

SDI

VREF

GND

OVDD

VDD

PAD

IN+

LTC2302CDD

103

6711

LT1761ES5 2.5

GND

ADJSHDN

OUT

2.5V

JP1

EXT

OVDD

IN+

JP4

EXT REF

VREF

4.096V

100

C15

47uF

10V

VREF/2

4.99K

C16

1uF

16V

EXT REF

NC7SVU04P5X

SDO_AT_590

JP2

CLK

CNV

7 8

OVDD

6V 9V

100

C11

0.01uF

SCK_AT_ADC

C17

10uF

6.3V

LT1761ES5 5

GND

ADJSHDN

OUT

SDI_AT_ADC

47pF

SDO_AT_BUF

0.1uF

JP3

GND

VREF/2

C13

0.01uF

C10

0.1uF

47pF

2.5V

0.1uF

301 1%

10uF

6.3V

4.99K

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1339

LOW NOISE, 500KSPS, 12-BIT ADC

C27

0.1uF

SHDN#

R11

49.9

U13

LT1719CS6

U11

LT1719CS6

R20

4.99K

R21

4.99K

SHDN

U12

LT1719CS6

R12

R24

2.49K

SHDN

R13

EDGE CON 100

100

SHDN

E17

SCK

C22

0.1uF

NC7SVU04P5X

NC7SZ66P5X

3 5

CONV_AT_ADC

C19

0.1uF

C24

0.1uF

R23

2.49K

SDI_AT_ADC

2.5V

C23

0.1uF

R14

E12

CNVCLK

R19

4.99K

1.25V E13

MISO

R10

MISO

E16

CNVST

CONV_AT_ADC

C28

0.1uF

UNI

E15

LATCH

C31

0.1uF

E11

CONV

VCC_IN

C30

0.1uF

C18

0.1uF

SHDN#

E14

MOSI

CLK_IN

R16

4.7K

2.5V

SDO_AT_590

Array

EEPROM

U16

24LC025 I /ST

SDA

VCC

VSS

SCL

7V C29

0.1uF

87831 1420

Molex

MOSI/SDA

EESDA

VUNREG

SCK/SCL

EEVCC

MISO

EESCL

EEGND

GND

SHDN

SDI_AT_ADC

R15

C26

0.1uF

1.25V

C25

0.1uF

U14

NC7SZ04P5X_NL

C20

0.1uF

1.25V

SDO_AT_590

JP5

SHDN

SCK_AT_ADC

1.25V

LATCH

U15

NC7SZ04P5X_NL

R22

4.99K

R18

2.00K

CONV

R17

U10

NL17SZ74USG

VCC

GND

CLR

MOSI

NC7SZ04P5X_NL

C32

2.2uF

16V

2.5V

CNVST

C21

0.1uF

SDO_AT_BUF

2.5V

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