REV. 0

–6–

AD7453

PIN CONFIGURATION

PIN FUNCTION DESCRIPTIONS

Mnemonic

Function

Reference Input for the AD7453. An external reference in the range 100 mV to 3.5 V must be applied to this input.

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

mF.

Noninverting Analog Input.

provide a 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.

mF capacitor

and a 10

mF tantalum capacitor.

8-Lead SOT-23

1

AD7453

TOP VIEW

(Not to Scale)

8

2

SCLK

7

3

CS

6

4

SDATA

GND

5