AD4682/AD4683

Data Sheet

Rev. 0 | Page 8 of 30

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

12

11

10

1

3

4

9

2

GND

REGCAP

REFCAP

GND

CS

REFIO

NOTES

1. EXPOSED PAD. FOR PROPER OPERATION OF THE DEVICE,

CONNECT THE EXPOSED PAD TO GROUND.

AD4682/

AD4683

TOP VIEW

(Not to Scale)

Figure 6. Pin Configuration

Table 7. Pin Function Descriptions

Pin No.

Mnemonic

Description

1, 10

GND

Ground Reference Points. The GND pins are the ground reference points for all circuitry on the device.

2

3

REGCAP

Decoupling Capacitor Pin for Voltage Output from the Internal Regulator. Decouple REGCAP to GND with a 1 µF

capacitor. The voltage at REGCAP is 1.9 V typical.

4

5, 6

7, 8

9

REFCAP

Decoupling Capacitor Pin for Band Gap Reference. Decouple REFCAP to GND with a 0.1 µF capacitor. The voltage

at REFCAP is 2.5 V typical.

11

REFIO

Reference Input and Output. The on-chip reference of 2.5 V is available as an output on REFIO for external use if

the device is configured accordingly. Alternatively, an external reference of 2.5 V to 3.3 V can be input to REFIO.

Set the REFSEL bit in the CONFIGURATION1 register to 1 when using the external reference, and apply the

options. Apply a 1 µF capacitor from REFIO to GND.

12

CS

Chip Select Input. Active low, logic input. CS provides the dual function of initiating conversions on the AD4682

and the AD4683 and framing the serial data transfer.

13

SDOA

Serial Data Output A. SDOA functions as a serial data output pin to access the ADC A or ADC B conversion results

or data from any of the on-chip registers.

14

SDOB/ALERT

Serial Data Output B/Alert Indication Output. The SDOB/ALERT pin can operate as a serial data output pin or an

alert indication output.

SDOB functions as a serial data output pin to access the ADC B conversion results.

ALERT operates as an alert pin going low to indicate that a conversion result exceeded a configured threshold.

When using ALERT, set the SDO bit in the CONFIGURATION2 register to 1, and set the ALERT_EN bit to 1 in the

CONFIGURATION1 register.

15

SDI

Serial Data Input. SDI provides the data written to the on-chip control registers.

16

SCLK

Serial Clock Input. SCLK is for data transfers to and from the ADC.

EPAD

Exposed Pad. For proper operation of the device, connect the exposed pad to ground.