CS5451A

DS635PP1

3

1.

PIN DESCRIPTION

Clock Generator

XIN - Master Clock Input

Control Pins and Serial Data I/O

SE - Serial Port Enable

When SE is low, the output pins of the serial port are 3-stated.

SDO - Serial Port Output

Data will be at a rate determined by SCLK.

FSO - Frame Signal Output

Framing signal output for data transfer from SDO pin.

SCLK - Serial Clock Output

A clock signal on this pin determines the output rate of data for SDO pin. Rate of SCLK is determined

by XIN frequency and state of OWRS input pin.

RESET - Reset

When reset is taken low, all internal registers are set to their default states.

GAIN - Input Gain Control

Sets input gain for current channels. A logic high sets internal gain to 1, a logic low level sets the gain

to 20.

If no connection is made to this pin, it will default to logic low level (through internal 200 k

Ω

resistor to DGND).

OWRS - Output Word Rate Select

When OWRS is set to logic low, the output word rate (OWR) at SDO pin is XIN/2048 (Hz). When set to

logic high, the OWR at SDO pin is XIN/1024 (Hz). If no connection is made to this pin, then OWRS will

default to logic low level (through internal 200 k

Ω resistor to DGND).

2

3

4

1

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

Serial Clock Output

SCLK

VD+

Digital Supply

Serial Data Output

SDO

DGND

Digital Ground

Frame Sync

FSO

CPD

Charge Pump Drive

Serial Port Enable

SE

XIN

Master Clock

Current Input Gain

GAIN

RESET

Reset

Analog Ground

AGND

OWRS

Output Word Rate Select

Reference Input

VREFIN

VIN1+

Differential Voltage Input 1

Reference Output VREFOUT

VIN1-

Differential Voltage Input 1

Positive Analog Supply

VA+

IIN1+

Differential Current Input 1

Negative Analog Supply

VA-

IIN1-

Differential Current Input 1

Differential Voltage Input 3

VIN3+

VIN2+

Differential Voltage Input 2

Differential Voltage Input 3

VIN3-

VIN2-

Differential Voltage Input 2

Differential Current Input 3

IIN3+

IIN2+

Differential Current Input 2

Differential Current Input 3

IIN3-

IIN2-

Differential Current Input 2