AD8031ARTZ datasheet(8/32 Pages) AD

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UG-609

EVAL-AD7903SDZ User Guide

Rev. 0 | Page 8 of 32

EVALUATION BOARD HARDWARE

DEVICE DESCRIPTION

The AD7903 is a 16-bit, 1 MSPS, precision, power efficient, dual

differential PulSAR ADC that uses SAR-based architecture and

does not exhibit any pipeline delay or latency. The AD7903 is

specified for use with a single supply of 2.5 V (VDD1, VDD2).

The interface from the digital host to the AD7903 uses 1.8 V/

2.5 V/3.3 V/5.5 V logic. The AD7903 is compatible with the

SPI/QSPI/MICROWIRE/DSP serial interface to transfer data

conversions. Complete AD7903 specifications are provided in

the AD7903 data sheet and should be consulted in conjunction

with this user guide when using the evaluation board. Full

details on the EVAL-SDP-CB1Z are available on the Analog

Devices website, at www.analog.com.

Figure 26 to Figure 31 show the evaluation board schematics.

The board consists of an AD7903 ADC (U1) with a reference

(U6—ADR435), and several ADC drivers (U12, U14, U16, and

U17—ADA4841-1YRZ). The evaluation board is a flexible

design that enables you to adjust compensation components

and operate the evaluation board from an adjustable bench top

power supply.

POWER SUPPLIES

The evaluation board can be powered from a wall adapter or

from a bench top power supply. By default, the board is set up

to operate from a 9 V wall adapter using the on-board power

supplies described in Table 1.

Table 1. Power Supplies Provided on the Board

Power Supply (V)

Function

Components Used

SDP power

ADP2301

+7.5

Positive rail

ADP7104

−2.5

Negative rail

ADP2301

+2.5

ADC VDD rail

ADP7104

+3.3

VDRIVE (digital power)

ADP7104

Each on-board power supply is decoupled where it enters the

board as well as where it connects to each device. A single ground

plane is used on this board to minimize the effect of high frequency

noise interference.

Alternatively, the board can be powered from a bench top power

supply by using the J2 and J3 screw terminals and changing the

SL1 to SL4 and LK3 to LK5 solder link settings to Position B (see

Table 2). When bench top power is used, use of the wall adapter

and the on-board power supplies are no longer required.

Table 2. Solder Links—Settings for Bench Top Power Supply1

Link

Setting

Function

SL1

+VS

SL2

−VS

SL3

−VS

SL4

+VS

LK3

V_SDP

LK4

VREF

LK5

VDD for ADC

All other solder link settings are as described in Table 3.

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