AD7991 datasheet(12/28 Pages) AD

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AD7991/AD7995/AD7999

Rev. 0 | Page 12 of 28

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

SCL 1

SDA 2

VIN0 3

VIN1 4

VDD

GND

VIN3/VREF

VIN2

AD7991/

AD7995/

AD7999

TOP VIEW

(Not to Scale)

Figure 3. SOT-23 Pin Configuration

Table 7. Pin Function Descriptions

No.

Mnemonic

Description

SCL

Digital Input. Serial bus clock. External pull-up resistor required.

SDA

Digital I/O. Serial bus bidirectional data. Open-drain output. External pull-up resistor required.

VIN0

Analog Input 1. Single-ended analog input channel. The input range is 0 V to VREF.

VIN1

Analog Input 2. Single-ended analog input channel. The input range is 0 V to VREF.

VIN2

Analog Input 3. Single-ended analog input channel. The input range is 0 V to VREF.

VIN3/VREF

Analog Input 4. Single-ended analog input channel. The input range is 0 V to VREF. Can also be used to input an

external VREF signal.

GND

Analog Ground. Ground reference point for all circuitry on the AD7991/AD7995/AD7999. All analog input signals

should be referred to this AGND voltage.

VDD

Power Supply Input. The VDD range for the AD7991/AD7995/AD7999 is from 2.7 V to 5.5 V.

Table 8. I2C Address Selection

Part Number

I2C Address

AD7991-0

010 1000

AD7991-1

010 1001

AD7995-0

010 1000

AD7995-1

010 1001

AD7999-1

010 1001

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