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Digital Interface

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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

Pin Number Signal Description, ADS1148/ADS1248

J8.1, J4-1 A0(–) AIN0

J8.2, J4-2 A0(+) AIN1

J8.3, J4-3 A1(–) AIN2

J8.4, J4-4 A1(+) AIN3

J8.5, J4-5 A2(–) AIN4

J8.6, J4-6 A2(+) AIN5

J8.7, J4-7 A3(–) AIN6

J8.8, J4-8 A3(+) AIN7

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)

3 Digital Interface

3.1 Serial Data Interface

The ADS1248EVM 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.

All logic levels on J7 are 3.3V CMOS, except for the I

C™ pins. These pins conform to 3.3V I

C rules.

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 ADS1248 SPI clock

J7.4 DGND DGND In/Out None Digital ground

J7.5 CLKR Unused – –

J7.6 GPIO1 MR In High Master reset

J7.7 FSX Unused – –

J7.8 GPIO2 Unused – –

J7.9 FSR DRDY Out None

J7.10 DGND DGND In/Out None Digital ground

J7.11 DX DIN In None ADS1248 SPI data in

J7.12 GPIO3 PWRSEL In High Selects ±2.5V or +5V

supply

J7.13 DR DOUT/DRDY Out None ADS1248 data out

J7.14 GPIO4 Unused – –

J7.15 INT DRDY Out None

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

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