AD7980 datasheet(7/16 Pages) AD

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AD7684

Rev. A | Page 7 of 16

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

REF

+IN

–IN

GND

VDD

DCLOCK

DOUT

AD7684

TOP VIEW

(Not to Scale)

Figure 6. 8-Lead MSOP Pin Configuration

Table 7. Pin Function Descriptions

Pin No.

Mnemonic

Type1

Description

REF

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

should be decoupled closely to the GND pin with a ceramic capacitor of a few μF.

+IN

Differential Positive Analog Input. Referenced to −IN. The input range for +IN is between 0 V and VREF,

centered about VREF/2 and must be driven 180° out of phase with −IN.

–IN

Differential Negative Analog Input. Referenced to +IN. The input range for −IN is between VREF and 0 V,

centered about VREF/2 and must be driven 180° out of phase with +IN.

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 complete. 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.

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