AD7691

Rev. 0 | Page 8 of 28

PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS

VIO

10

SDI

9

SCK

8

SDO

7

CNV

6

AD7691

TOP VIEW

(Not to Scale)

Figure 5. 10-Lead MSOP Pin Configuration

1

REF

2

VDD

3

IN+

4

IN–

5

GND

10 VIO

NOTES

1. QFN PACKAGE IN DEVELOPMENT. CONTACT

SALES FOR SAMPLES AND AVAILABILITY.

9SDI

8SCK

7SDO

6CNV

TOP VIEW

(Not to Scale)

AD7691

Figure 6. 10-Lead QFN (LFCSP) Pin Configuration

Table 7. Pin Function Descriptions

Pin No.

Mnemonic

Type1

Description

1

REF

AI

Reference Input Voltage. The REF range is from 0.5 V to VDD. It is referred to the GND pin. This

pin should be decoupled closely to the pin with a 10 μF capacitor.

2

VDD

P

Power Supply.

3

IN+

AI

Differential Positive Analog Input.

4

IN−

AI

Differential Negative Analog Input.

5

GND

P

Power Supply Ground.

6

CNV

DI

Convert Input. This input has multiple functions. On its leading edge, it initiates the conversions

and selects the interface mode of the part, either chain or CS mode. In CS mode, it enables the

SDO pin when low. In chain mode, the data should be read when CNV is high.

7

SDO

DO

Serial Data Output. The conversion result is output on this pin. It is synchronized to SCK.

8

SCK

DI

Serial Data Clock Input. When the part is selected, the conversion result is shifted out by this

clock.

9

SDI

DI

Serial Data Input. This input provides multiple features. It selects the interface mode of the ADC

as follows:

Chain mode is selected if SDI is low during the CNV rising edge. In this mode, SDI is used as a

data input to daisy-chain the conversion results of two or more ADCs onto a single SDO line.

The digital data level on SDI is output on SDO with a delay of 18 SCK cycles.

CS mode is selected if SDI is high during the CNV rising edge. In this mode, either SDI or CNV

can enable the serial output signals when low, and if SDI or CNV is low when the conversion is

complete, the busy indicator feature is enabled.

10

VIO

P

Input/Output Interface Digital Power. Nominally at the same supply as the host interface (1.8 V,

2.5 V, 3 V, or 5 V).