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Overview
1.3
ADS528x EVM Quick Start Procedure
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. Three-Pin Jumper List
JUMPER
JP2
JP3 (SMT)
JP4 (SMT)
JP5 (SMT)
JP8
JP9
FUNCTION
ADC internal or external reference
selection
EVM clock input selection
ADC CLKP
ADC CLKM
Selects power management
configuration
Selects power management
configuration
LOCATION: PINS 1–2
ADC internal reference
Transformer coupled
Transformer
Transformer
ADC powered by LDO (3.3 V)
ADC powered by LDO (1.8 V)
LOCATION: PINS 2–3
ADC external reference
Single-ended PECL
Single-ended PECL
GND
ADC powered by J4 (3.3 V)
ADC powered by J5 (1.8 V)
DEFAULT
1–2
1–2
1–2
1–2
1–2
1–2
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
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
7
TI [ TEXAS INSTRUMENTS ]
