2

Analog Interface

3

Digital Interface

3.1

Serial Data Interface

Analog Interface

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For maximum flexibility, the ADS1246EVM is designed for easy interfacing to multiple analog sources.

Samtec part numbers SSW-110-22-F-D-VS-K and TSM-110-01-T-DV-P provide a convenient 10-pin,

dual-row, header/socket combination at J8. This header/socket provides access to the analog input pins of

the ADS1246. Consult Samtec at http://www.samtec.com or call 1-800-SAMTEC-9 for a variety of mating

connector options. These signals can also be connected to the terminal block J4.

All of the pins on J4 and J8 are connected with minimal filtering or protection. Use appropriate caution

when handling these pins. Table 1 summarizes the pinouts for analog interfaces J4 and J8.

Table 1. J8/J4: Analog Interface Pinout

Description,

Pin Number

Signal

ADS1146/ADS1246

J8.1, J4-2

A0(–)

AINN

J8.2, J4-1

A0(+)

AINP

J8.3-8

Unused

—

J8.18

REF–

External Reference source input

(– side of differential input)

J8.20

REF+

External Reference source input

(+ side of differential input)

J8.10-16 (even)

Unused

—

J8.15

Unused

—

J8.9-19 (odd), J4-9

AGND

Analog ground connections

(except J8.15)

The ADS1246EVM is designed to easily interface with multiple control platforms. Samtec part numbers

SSW-110-22-F-D-VS-K and TSM-110-01-T-DV-P provide a convenient 10-pin, dual-row, header/socket

combination at J7. This header/socket provides access to the digital control and serial data pins of the

ADC. Consult Samtec at http://www.samtec.com or call 1-800-SAMTEC-9 for a variety of mating

connector options.

Table 2 describes the J7 serial interface pins.

Table 2. J7: Serial Interface Pins

Pin No.

Pin Name

Signal Name

I/O Type

Pullup

Function

J7.1

CNTL

CS

In

High

J7.2

GPIO0

START

In

High

J7.3

CLKX

SCLK

In

None

ADS1246 SPI

clock

J7.4

DGND

DGND

In/Out

None

Digital ground

J7.5

CLKR

Unused

—

None

J7.6

GPIO1

MR

In

High

Master reset

J7.7

FSX

Unused

—

None

J7.8

GPIO2

Unused

—

None

J7.9

FSR

DRDY

Out

None

J7.10

DGND

DGND

In/Out

None

Digital ground

J7.11

DX

DIN

In

None

ADS1246 SPI

data in

4

ADS1146EVM, ADS1246EVM, ADS1146EVM-PDK, ADS1246EVM-PDK

SBAU149A – June 2009 – Revised July 2009

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