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Power Supplies

Table 2. J7: Serial Interface Pins (continued)

Pin No. Pin Name Signal Name I/O Type Pullup Function

J7.16 SCL SCL I

C High I

C clock

J7.17 TOUT CLK In None Can be used to provide

a clock from a

processor

J7.18 DGND DGND In/Out None Digital ground

J7.19 GPIO5 CLK Select – None

J7.20 SDA SDA I

C High I

C data

Many pins on J7 have weak pull-up resistors. These resistors provide default settings for many of the

control pins. Many pins on J7 correspond directly to ADS1248 pins. See the ADS1248 product data sheet

for complete details on these pins.

4 Power Supplies

J11 is the power-supply input connector. Table 3 lists the configuration details for J11.

Table 3. J11 Configuration: Power-Supply Input

Pin No. Pin Name Function Required

J11.1 +VA Unused No

J11.2 –VA Unused No

J11.3 +5VA +5V analog supply Always

J11.4 –5VA –5V analog supply Only in bipolar mode

J11.5 DGND Digital ground input Yes

J11.6 AGND Analog ground input Yes

J11.7 +1.8VD 1.8V digital supply No

J11.8 VD1 Unused No

J11.9 +3.3VD 3.3V digital supply Always

J11.10 +5VD +5V digital supply No

All of the power supplies (AVDD, AVSS, and DVDD) have corresponding jumpers on J10 that can be

replaced with a current meter to measure the respective supply currents.

4.1 Power Options

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

For normal operation, J10.1-2, J10.3-4, and J10.5-6 must be connected (direct or through an ammeter),

and either (or both) of J10.7-8 and J10.9-10 must be connected; otherwise, the board does not function.

Table 4. J10 Configuration: Power Options

Row Name Function

1-2 ADC AVDD AVDD supply current measurement point for the ADC. Must be

connected for operation.

3-4 ADC AVSS AVSS supply current measurement point for the ADC. Must be

connected for operation.

5-6 ADC DVDD DVDD supply current measurement point for the ADC. Must be

connected for operation.

7-8 DGND Connects DGND to board ground.

9-10 AGND Connects AGND to board ground.

SBAU142B– April 2009–Revised May 2011 ADS1148EVM, ADS1248EVM, ADS1148EVM-PDK, and ADS1248EVM-PDK

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