Data Sheet

AD7380-4

Rev. 0 | Page 9 of 31

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

2

1

3

4

5

13

GND

6

7

REGCAP

GND

14

GND

15

DNC

16

GND

17

REFIN

18

CS

8

9

10 11

12

19

20

21

22

23

24

AD7380-4

TOP VIEW

(Not to Scale)

NOTES

1. DNC = DO NOT CONNECT.

2. EXPOSED PAD. FOR CORRECT OPERATION OF THE DEVICE

THE EXPOSED PAD MUST BE CONNECTED TO GND.

Figure 9. Pin Configuration

Table 8. Pin Function Descriptions

Pin No.

Mnemonic

Description

1, 5, 14, 16

GND

Ground Reference Point. These pins are the ground reference points for all circuitry on the device.

2

Logic Interface Supply Voltage, 1.65 V to 3.6 V. Decouple this pin to GND with a 1 µF capacitor.

3

REGCAP

Decoupling Capacitor Pin for Voltage Output from Internal Regulator. Decouple this pin to GND with a 1

µF capacitor. The voltage at this pin is 1.9 V typical.

4

Power Supply Input Voltage. 3.0 V to 3.6 V. Decouple this pin to GND using a 1µF capacitor.

6, 7

Analog Inputs of ADC D. These analog inputs form a fully differential pair.

8, 9

Analog Inputs of ADC C. These analog inputs form a fully differential pair.

10, 11

Analog Inputs of ADC B. These analog inputs form a fully differential pair.

12, 13

Analog Inputs of ADC A. These analog inputs form a fully differential pair.

15

DNC

Do Not Connect.

17

REFIN

Reference Input. An external reference of 2.5 V to 3.3 V can be input to this pin. Decoupling is required on

this pin. Apply a 1 µF capacitor from this pin to GND.

18

CS

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

on the AD7380-4 and framing the serial data transfer.

19

SDOA

Serial Data Output A. This pin functions as a serial data output pin to access the conversion results and

register contents.

20

SDOB

Serial Data Output B. This pin functions as a serial data output pin to access the conversion results.

21

SDI

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

22

SCLK

Serial Clock Input. This serial clock input is for data transfers to and from the ADC.

23

SDOC

Serial Data Output C. This pin functions as a serial data output pin to access the conversion results and

register contents.

24

SDOD/ALERT

Serial Data Output D/Alert Indication Output. This pin can operate as a serial data output pin or alert

indication output.

SDOD. This pin functions as a serial data output pin to access the conversion results.

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

configured threshold.

Not applicable

EPAD

Exposed Pad. For correct operation of the device, the exposed pad must be connected to GND.