AD7476/AD7477/AD7478

Rev. F | Page 10 of 24

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

1

6

CS

2

GND

5

SDATA

3

4

SCLK

AD7476/

AD7477/

AD7478

TOP VIEW

(Not to Scale)

Figure 3. Pin Configuration

Table 6. Pin Function Descriptions

Pin No.

Mnemonic

Description

1

2

GND

Analog Ground. Ground reference point for all circuitry on the part. All analog input signals should be referred to this

GND voltage.

3

4

SCLK

Serial Clock. Logic input. SCLK provides the serial clock for accessing data from the part. This clock input is also used as

the clock source for the AD7476/AD7477/AD7478 conversion process.

5

SDATA

Data Out. Logic output. The conversion result is provided on this output as a serial data stream. The bits are clocked

out on the falling edge of the SCLK input. The data stream from the AD7476 consists of four leading zeros followed by

the 12 bits of conversion data; this is provided MSB first. The data stream from the AD7477 consists of four leading

zeros followed by the 10 bits of conversion data, followed by two trailing zeros, which is also provided MSB first. The

data stream from the AD7478 consists of four leading zeros followed by the eight bits of conversion data, followed by

four trailing zeros, which is provided MSB first.

6

CS

Chip Select. Active low logic input. This input provides the dual function of initiating conversions on the

AD7476/AD7477/AD7478 and framing the serial data transfer.