AD7476A/AD7477A/AD7478A

Rev. F | Page 11 of 28

PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS

TOP VIEW

(Not to Scale)

6

5

4

1

2

3

GND

CS

SDATA

SCLK

AD7476A/

AD7477A/

AD7478A

Figure 5. 6-Lead SC70 Pin Configuration

8

7

6

5

1

2

3

4

NC = NO CONNECT

SDATA

GND

SCLK

NC

NC

TOP VIEW

(Not to Scale)

AD7476A/

AD7477A/

AD7478A

CS

Figure 6. 8-Lead MSOP Pin Configuration

Table 6. Pin Function Descriptions

Mnemonic

Description

CS

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

AD7476A/AD7477A/AD7478A and also frames the serial data transfer.

GND

Analog Ground. Ground reference point for all circuitry on AD7476A/AD7477A/AD7478A. Refer all analog input signals to this

GND voltage.

SDATA

Data Out. Logic output. The conversion result from AD7476A/AD7477A/AD7478A 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 AD7476A consists of four

leading zeros followed by 12 bits of conversion data that are provided MSB first. The data stream from the AD7477A consists

of four leading zeros followed by 10 bits of conversion data followed by two trailing zeros, provided MSB first. The data stream

from the AD7478A consists of four leading zeros followed by 8 bits of conversion data followed by four trailing zeros that are

provided MSB first.

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 conversion process of AD7476A/AD7477A/AD7478A.

NC

No Connect.