AD7453

Rev. B | Page 7 of 20

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

SCLK

2

SDATA

3

CS

4

GND

8

7

6

5

AD7453

TOP VIEW

(Not to Scale)

Figure 4. Pin Function Descriptions

Table 4. Pin Function Descriptions

Mnemonic

Function

reference input is 2.5 V. This pin should be decoupled to GND with a capacitor of at least 0.1 µF.

Noninverting Analog Input.

pseudo ground.

GND

Analog Ground. Ground reference point for all circuitry on the AD7453. All analog input signals and any external reference

signal should be referred to this GND voltage.

CS

Chip Select. Active low logic input. This input provides the dual function of initiating a conversion on the AD7453 and

framing the serial data transfer.

SDATA

Serial Data. Logic output. The conversion result from the AD7453 is provided on this output as a serial data stream. The bits

are clocked out on the falling edge of the SCLK input. The data stream of the AD7453 consists of four leading zeros followed

by the 12 bits of conversion data that are provided MSB first. The output coding is straight (natural) binary.

SCLK

Serial Clock. Logic input. SCLK provides the serial clock for accessing data from the part. This clock input is also used as the

clock source for the conversion process.

tantalum capacitor.