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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

High

I

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

High

I

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.

5

SBAU142B

– April 2009 – Revised May 2011

ADS1148EVM, ADS1248EVM, ADS1148EVM-PDK, and ADS1248EVM-PDK

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