AD7767

Rev. 0 | Page 9 of 24

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

1

2

3

4

5

6

7

8

REFGND

SYNC/PD

AGND

16

15

14

13

12

11

10

9

SDI

MCLK

SCLK

SDO

DGND

DRDY

CS

AD7767/

AD767-1/

AD7767-2

TOP VIEW

(Not to Scale)

Figure 6. 16-Lead TSSOP Pin Configuration

Table 5. Pin Function Descriptions

Pin No.

Mnemonic

Description

1

+2.5 V Analog Power Supply.

2

3

REFGND

decoupled to this pin.

4

Positive Input of the Differential Analog Input.

5

Negative Input of the Differential Analog Input.

6

AGND

Power Supply Ground for Analog Circuitry.

7

SYNC/PD

Synchronization and Power-Down Input Pin. This pin has dual functionality. It can be used to synchronize multiple

AD7767 devices and/or put the AD7767 device into power-down mode. See the Power-Down, Reset, and

Synchronization section for further details.

8

9

Logic Power Supply Input, +1.8 V to +3.6 V. The voltage supplied at this pin determines the operating voltage of

the digital logic interface.

10

SDO

Serial Data Output (SDO). The conversion result from the AD7767 is output on the SDO pin as a 24-bit, twos

complement, MSB first, serial data stream.

11

DGND

Digital Logic Power Supply Ground.

12

DRDY

Data Ready Output. A falling edge on the DRDY signal indicates that a new conversion data result is available in the

output register of the AD7767. See the AD7767 Interface section for further details.

13

SCLK

Serial Clock Input. The SCLK input provides the serial clock for all serial data transfers with the AD7767 device. See

the AD7767 Interface section for further details.

14

MCLK

Master Clock Input. The AD7767 sampling frequency is equal to the MCLK frequency.

15

SDI

Serial Data Input. This is the daisy chain input of the AD7767. See the Daisy Chaining section for further details.

16

CS

Chip Select Input. The CS input selects the AD7767 device and acts as an enable on the SDO pin. In cases where CS

is used, the MSB of the conversion result is clocked onto the SDO line on the CS falling edge. The CS input allows

multiple AD7767 devices to share the same SDO line. This allows the user to select the appropriate device by

supplying it with a logic low CS signal, which enables the SDO pin of the device concerned. See the AD7767

Interface section for further details.