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Digital Interface

3 Digital Interface

3.1 Serial Data Interface

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 J2. This header/socket provides access to the digital control pins of the

EVM. Consult Samtec at www.samtec.com or 1-800-SAMTEC- 9 for a variety of mating connector options.

Table 2 describes the J2 serial interface pins.

Table 2. J2: Serial Interface Header

Pin Number Signal Description

J2.1 CS ADC CS signal: controlled by jumper JP1

J2.2 GPIO ADC PD / Alert signal

J2.3 SCLK ADC SCLK signal

J2.4 GND Digital ground

J2.5 SCLK ADC SCLK signal

J2.7 CS ADC CS signal: controlled by jumper JP1

J2.9 CS ADC CS signal: controlled by jumper JP1

J2.10 GND Digital ground

J2.11 SDI ADC SDI signal

J2.13 SDO ADC SDO signal

J2.16 SCL I

C™ clock line for EEPROM

J2.18 GND Digital ground

J2.20 SDA I

C data line for EEPROM

4 Power Supplies

J3 is the power-supply input connector. Table 3 lists the configuration details for J3.

Table 3. J3: Power-Supply Interface Header

Pin Number Pin Name Function Required

J3.1 +VA High voltage positive Yes

analog supply

J3.2 –VA High voltage negative Yes

analog supply

J3.3 +5VA 5-V analog supply Yes

J3.4 –5VA Unused No

J3.5 GND Digital ground input Yes

J3.6 GND Analog ground input Yes

J3.7 +1.8VD 1.8-V digital supply Yes/Optional

J3.8 VD1 Unused No

J3.9 +3.3VD 3.3-V digital supply Yes/Optional

J3.10 +5VD Unused Yes/Optional

SBAU192– July 2011 ADS8638EVM-PDK

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