AD7992

Rev. 0 | Page 8 of 28

PIN CONFIGURATION AND PIN FUNCTION DESCRIPTIONS

AD7992

TOP VIEW

1

2

3

4

7

8

9

10

SDA

SCL

AGND

AGND

5

(Not to Scale)

ALERT

6

AS

CONVST

Figure 3. AD7992 Pin Configuration

Table 5. Pin Function Descriptions

Pin No.

Mnemonic

Function

2, 7

AGND

Analog Ground. Ground reference point for all circuitry on the AD7992. All analog input signals should be

referred to this GND voltage.

3

4

Analog Input 2/Voltage Reference Input. In single-channel mode, this pin becomes the reference voltage input;

and 1µF capacitor should be tied between this pin and AGND. If Bit D6 is set to 1 in the configuration register,

the AD7992 operates in single-channel mode. In dual-channel mode, D6 in the configuration register is 0; in

this case, this pin provides the second analog input channel. The reference voltage for the AD7992 is taken

from the power supply voltage in dual-channel mode. See the Configuration Register section and Table 10.

5

6

AS

1

CONVST

Logic Input Signal. Convert start signal. This is an edge-triggered logic input. The rising edge of this signal

powers up the part. The power up time for the part is 1 µs. The falling edge of CONVST places the track-and-

hold into hold mode and initiates a conversion. A power-up time of at least 1 µs must be allowed for the

CONVST high pulse; otherwise, the conversion result is invalid (see the Modes of Operation section).

8

ALERT/BUSY

Digital Output. Selectable as an ALERT or BUSY output function. When configured as an ALERT, this pin acts as

active when a conversion is in progress. Open-drain output. An external pull-up resistor is required.

9

SDA

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

10

SCL

Digital Input. Serial bus clock. Open-drain output. An external pull-up resistor is required.

Part Number

AS Pin

AD7992-0

GND

010 0001

AD7992-0

010 0010

AD7992-1

GND

010 0011

AD7992-1

010 0100

AD7992-x1

Float

010 0000