AD7991/AD7995/AD7999
Rev. B | Page 12 of 28
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
06
46
1-
00
3
SCL 1
SDA 2
VIN0 3
VIN1 4
VDD
8
GND
7
VIN3/VREF
6
VIN2
5
AD7991/
AD7995/
AD7999
TOP VIEW
(Not to Scale)
Figure 3. SOT-23 Pin Configuration
Table 7. Pin Function Descriptions
Pin
No.
Mnemonic
Description
1
SCL
Digital Input. Serial bus clock. External pull-up resistor required.
2
SDA
Digital I/O. Serial bus bidirectional data. Open-drain output. External pull-up resistor required.
3
VIN0
Analog Input 1. Single-ended analog input channel. The input range is 0 V to VREF.
4
VIN1
Analog Input 2. Single-ended analog input channel. The input range is 0 V to VREF.
5
VIN2
Analog Input 3. Single-ended analog input channel. The input range is 0 V to VREF.
6
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.
7
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.
8
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