Linear Technology LTC2351-14 Guía

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1278

6-CHANNEL, 14-BIT, 1.5MSPS SIMULTANEOUS SAMPLING ADC

LTC2351-14

DESCRIPTION

Demonstration circuit 1278 features the LTC2351-14

6-channel, 14-Bit, simultaneous sampling ADC. Total

throughput is 1.5MSPS; 250KSPS per channel, with a

typical channel-to-channel aperture skew of 200ps.

The board is designed to be used with the DC890B

Fast DAACS data collection board to show the AC

performance of the LTC2351-14. Alternatively, the

board can be directly connected to an application to

evaluate the ADC’s performance.

Design files for this circuit board are available. Call

the LTC factory.

LTC is a trademark of Linear Technology Corporation

QUICK START PROCEDURE

BASIC CONNECTIONS

Connect DC1278 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 5-7V DC to the VIN and GND terminals. Apply a

25MHz 3.3Vp-p sine wave or square wave to connec-

tor J3. Note that J3 has a 50 ohm termination resistor

to ground. CH0-CH5 are provided through connector

J1 (See schematic for details.). Run the QuickEval II

(Pscope.exe) evaluation software supplied with

DC890 or download it from www.linear.com/software.

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1278

6-CHANNEL, 14-BIT, 1.5MSPS SIMULTANEOUS SAMPLING ADC

Figure 1.

CONNECTION DIAGRAM

40 pin Analog

Signal Connector

(Refer to Schematic)

To DC890

Controller

Master clock at

x co

vers

ion rate,

3.3Vpp

Sine or Square wave (See

Hardware Setup Section)

7VDC Supply

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1278

6-CHANNEL, 14-BIT, 1.5MSPS SIMULTANEOUS SAMPLING ADC

Figure 2.

SOFTWARE SCREENSHOT

Figure 3. CONFIGURE MENUS

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1278

6-CHANNEL, 14-BIT, 1.5MSPS SIMULTANEOUS SAMPLING ADC

SOFTWARE CONFIGURATION

CONFIGURE DEVICE

The Pscope software should automatically config-

ure itself after detecting the demo board. To change

from Bipolar to Unipolar mode it will be necessary

to manually configure the software. In the

CONFIGURE menu (See Figure 3) select Device,

which will bring up another window. In this window,

select User Configure and adjust the other settings

as follows:

Bits: 14

Alignment: 14

Bipolar: Checked if BIP jumper is set high, Un-

Checked if BIP jumper is set to low. (Default is

checked)

Channels: 6

Positive Edge Clk: UN-Checked

FPGA: Serial 1408 Class.

CONFIGURE SOFTWARE SCREEN

The software interface is highly configurable and

displays any combination of time domain data, fre-

quency domain data, primitive wave and perform-

ance parameters (SNR, THD, SINAD, etc.). The

screen can be broken into multiple panes as shown

in Figure 2. Complete documentation on configur-

ing PSCOPE can be found in the help file.

Click the COLLECT button to begin acquiring data.

Complete software documentation is available from

the Help menu item, as features may be added peri-

odically.

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1278

6-CHANNEL, 14-BIT, 1.5MSPS SIMULTANEOUS SAMPLING ADC

HARDWARE SET-UP

JUMPERS

JP1, JP2 - Select number of channels to convert

and Unipolar / Bipolar selection. NCH2, NCH1,

NCH0 are set to 111 which selects all six channels.

These switches should be left in this position when

running Pscope software. UNI/BIP selection applies

to all channels. Refer to Figure 4.

JP3 – Enable Oscillator and Oscillator Division.

Presently not used. This may be used in the future

as serial clock, to allow a convert signal at 1X the

conversion rate.

JP4 – Digital Interface Header. Provides direct con-

nection to the LTC2351-14 CONV, SDO, and SCK

pins. This can be used to either monitor signals

with a logic analyzer or to drive the LTC2351-14

directly from the customer’s test equipment or pro-

totype circuitry. DC890B should be disconnected

before driving the LTC2351-14 externally with JP4.

Note that R34 should be removed if the CONV sig-

nal is being driven externally.

JP5 – Currently not used

SIGNAL CONNECTIONS

J1 – 40 pin connector with CH0-CH5 differential

inputs, multiple grounds, a mid-supply bias voltage

and Vref. Refer to schematic for pin out. The mid-

supply bias voltage can be used to bias the minus

ADC inputs for bipolar conversions.

J2 – Data connections to DC890B collection board.

J3 – Conversion Clock Input. This input has a 50

ohm termination resistor, and is intended to be

driven by a 3.3Vpp sine or square wave. This clock

is divided by 98 in the DC890B collection board to

control the serial interface and convert pulse. To run

the LTC2351-14 at maximum conversion rate, apply

a 25MHz signal to this input.

GROUNDING AND POWER CONNECTION

Connect a 5V to 7V power supply to the Vin and

GND turret posts. For optimum performance, this

supply should be floating with respect to any signal

generators connected to the analog inputs.

Figure 4 – JP1, JP2 CONFIGURATION

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1278

6-CHANNEL, 14-BIT, 1.5MSPS SIMULTANEOUS SAMPLING ADC

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1278

6-CHANNEL, 14-BIT, 1.5MSPS SIMULTANEOUS SAMPLING ADC

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