Datasheet

T/H
8-BIT
SUCCESSIVE
APPROXIMATION
ADC
SCLK
CS
SDATA
CONTROL
LOGIC
V
IN
ADC081S051
SNAS309E –APRIL 2005–REVISED MARCH 2013 www.ti.com
Block Diagram
PIN DESCRIPTIONS and EQUIVALENT CIRCUITS
Pin No. Symbol Description
ANALOG I/O
3 V
IN
Analog input. This signal can range from 0V to V
A
.
DIGITAL I/O
4 SCLK Digital clock input. This clock directly controls the conversion and readout processes.
5 SDATA Digital data output. The output samples are clocked out of this pin on falling edges of the SCLK pin.
6 CS Chip select. On the falling edge of CS, a conversion process begins.
POWER SUPPLY
Positive supply pin. This pin should be connected to a quiet +2.7V to +5.25V source and bypassed to
1 V
A
GND with a 1 µF capacitor and a 0.1 µF monolithic capacitor located within 1 cm of the power pin.
2 GND The ground return for the supply and signals.
PAD GND For package suffix CISD(X) only, it is recommended that the center pad should be connected to ground.
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