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1.3

ADS528x EVM Quick Start Procedure

Overview

The ADS528x EVM provides a flexible means of evaluating the ADS528x in a number of modes of

operation. A basic setup procedure that can be used as a board confidence check is as follows:

1. Verify all jumper settings against the schematic jumper list in Table 1.

Table 1. Three-Pin Jumper List

JUMPER

FUNCTION

LOCATION: PINS 1–2

LOCATION: PINS 2–3

DEFAULT

JP2

ADC internal or external reference

ADC internal reference

ADC external reference

1–2

selection

JP3 (SMT)

EVM clock input selection

Transformer coupled

Single-ended PECL

1–2

JP4 (SMT)

ADC CLKP

Transformer

Single-ended PECL

1–2

JP5 (SMT)

ADC CLKM

Transformer

GND

1–2

JP8

Selects power management

ADC powered by LDO (3.3 V)

ADC powered by J4 (3.3 V)

1–2

configuration

JP9

Selects power management

ADC powered by LDO (1.8 V)

ADC powered by J5 (1.8 V)

1–2

configuration

2. Connect a 5-V supply to J1 and its return to J2.

3. Switch power supplies on.

4. Using a function generator with 50-

Ω output, generate a 0-V offset, 1.5-Vpp sine-wave clock into J26.

The frequency of the clock must be within the specification for the device speed grade.

5. Use a frequency generator with a 50-

Ω output to provide a 5-MHz, 0-V offset, –1-dBFS-amplitude

sine-wave signal into J9. This provides a transformer-coupled differential input signal to the ADC.

6. Connect the USB cable, open the PC software and provide a reset command. For first-time use, see

Section 3.1 for installation instructions.

7. Connect J8 to the ADS5281DeSerAdapter+ADSDeser-50EVM or TSW1200 deserializer card to

evaluate the ADC digital data using a logic analyzer.

Note:

Software Operation: Users must use the accompanying software to issue a reset command

before taking measurements. In addition to providing the ADS528X with the initialization

register writes detailed in the data sheet, the accompanying software also sets the state of

ADC pins ADCRESET and PD. Failure to do so can cause improper operation.

SLAU205 – January 2008

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