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Data Sheet

AD7683

Rev. B | Page 7 of 16

PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS

REF 1

+IN 2

–IN 3

GND 4

VDD

DCLOCK

DOUT

AD7683

TOP VIEW

(Not to Scale)

Figure 6. 8-Lead MSOP Pin Configuration

Table 8. 8-Lead MSOP Pin Function Descriptions

Pin No.

Mnemonic

Type1

Function

REF

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

REF pin closely to the GND pin with a ceramic capacitor of a few μF.

+IN

Analog Input. It is referred to Pin –IN. The voltage range, that is, the difference between +IN and –IN, is 0 V

to VREF.

–IN

Analog Input Ground Sense. Connect this pin to either the analog ground plane or a remote sense ground.

GND

Power Supply Ground.

Chip Select Input. On its falling edge, it initiates the conversions. The part returns to shutdown mode as

soon as the conversion is completed. It also enables DOUT. When high, DOUT is high impedance.

DOUT

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

DCLOCK

Serial Data Clock Input.

VDD

Power Supply.

1 AI = analog input; DI = digital input; DO = digital output; and P = power.

–IN

GND

REF

+IN

6DOUT

5CS

NOTES

1. EXPOSED PAD. CONNECT THE EXPOSED PAD TO GND. THIS CONNECTION

IS NOT REQUIRED TO MEET SPECIFIED ELECTRICAL PERFORMANCE.

8VDD

7 DCLOCK

AD7683

TOP VIEW

(Not to Scale)

Figure 7. 8-Lead QFN (LFCSP) Pin Configuration

Table 9. 8-Lead QFN (LFCSP) Pin Function Descriptions

Pin No.

Mnemonic

Type1

Function

REF

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

REF pin closely to the GND pin with a ceramic capacitor of a few μF.

+IN

Analog Input. It is referred to Pin –IN. The voltage range, that is, the difference between +IN and –IN, is 0 V

to VREF.

–IN

Analog Input Ground Sense. Connect this pin to either the analog ground plane or a remote sense ground.

GND

Power Supply Ground.

Chip Select Input. On its falling edge, it initiates the conversions. The part returns to shutdown mode as

soon as the conversion is completed. It also enables DOUT. When high, DOUT is high impedance.

DOUT

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

DCLOCK

Serial Data Clock Input.

VDD

Power Supply.

EPAD

Exposed Pad. Connect the exposed pad to GND. This connection is not required to meet specified

electrical performance.

1 AI = analog input; DI = digital input; DO = digital output; and P = power.

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