Datasheet

Power Supplies

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4 Power Supplies

J2 is the power-supply input connector. Table 3 lists the configuration details for J2.

Table 3. J2 Configuration: Power-Supply Input

Pin No. Pin Name Function Required

J2.1 +VA Unused No

J2.2 –VA Unused No

J2.3 +5VA +5V analog supply Always

J2.4 –5VA –5V analog supply No

J2.5 DGND Digital ground input Yes

J2.6 AGND Analog ground input Yes

J2.7 +1.8VD 1.8V digital supply Sometimes

J2.8 VD1 Unused No

J2.9 +3.3VD 3.3V digital supply Always

J2.10 +5VD +5V No

All of the power supplies (VDD and BVDD) have corresponding jumpers on J7 that can be replaced with a

current meter to measure the respective supply currents.

4.1 Power Options

J7 is arranged as four rows, each of which can be shorted. Table 4 lists the power option details for J10.

For normal operation, J7.1-2, J7.3-4, J7.5-6, and J7.7-8 must be connected (direct or through an ammeter

otherwise, the board does not function.

Table 4. J7 Configuration: Power Options

Row Name Function

VDD supply point for the ADC. Must be connected

1-2 ADC VDD

for operation.

BVDD supply point for the ADC. Must be connected

3-4 ADC BVDD

for operation.

5-6 AGND Connects AGND to board ground.

7-8 DGND Connects AGND to board ground.

space

Switches S1 and S2 are also used to select the operational voltage of the EVM. Switch S1 selects the

VDD voltage for the EVM from J2.3 (+5VA) or J2.9 (+3.3VD). Switch S2 selects the BVDD voltage for the

EVM from J2.3 (+5VA), J2.7 (+1.8VD) or J2.9 (+3.3VD).

ADS7924EVM and ADS7924EVM-PDK User's Guide SBAU173–June 2010