Linear Technology 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. 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 50•

termination 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 50•

termination 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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