Copyright © 2008, ZMD AG, Rev. 1.1

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ZADCS1282/1242/1222

12-Bit, 200ksps, Serial Output ADC Family

Datasheet

Features

·

Single Supply Operation:

+ 2.7V … + 5.25V

·

Family approach providing

2 / 4 / 8-Channel Single-Ended or

1 / 2 / 4-Channel Differential Inputs

·

Up to 200ksps Conversion Rate

·

± 1 LSB INL and DNL

·

No Missing Codes

·

> 70 dB SINAD

·

True fully differential Operation

·

Software-Configurable Unipolar or

Bipolar output coding

·

Internal 3.2MHz oscillator for independent

operation from external clock

·

Internal 2.5V Reference

·

Low Power

-

< 1.2mA (200ksps, 5V supply)

-

< 0.5μA (power-down mode)

·

SPI

4-Wire Serial Interface

·

14 / 16 / 20-Pin SSOP

Applications

·

Data Acquisition

·

Industrial Process Control

·

Portable Data Logging

·

Battery-Powered Systems

Functional Block Diagram

Description

The ZADCS12x2 family is a set of low power, 12-bit, suc-

cessive approximation analog-to-digital (A/D) converters

with up to 200ksps conversion rate, two up to eight input

channels, high-bandwidth track/hold and synchronous

serial interface.

The ADCs operate from a single + 2.7V to + 5.25V supply.

Their analog inputs are software configurable for unipo-

lar/bipolar and single-ended/differential operation.

The 4-wire serial interface connects directly to SPI™/

(QSPI™ and MICROWIRE™) devices without external

logic.

All family devices can use either the external serial-

interface clock or an internal clock to perform successive-

approximation analog-to-digital conversions. The internal

clock can be used to run independent conversions on

more than one device in parallel.

The ZADCS12x2V versions are equipped with a highly

accurate internal 2.5V reference with an additional external

±1.5% voltage adjustment range.

All members of the ZADCS12x2 family provide a hard-

wired shut-down pin (nSHDN) pin and software-selectable

power-down modes that can be programmed to automati-

cally shut down the IC at the end of a conversion. Access-

ing the serial interface automatically powers up the IC. A

quick turn-on time allows the device to be shut down be-

tween all conversions.

8-Channel

Analog

Input

Multiplexer

DAC with

inherent

T&H

SAR

Serial

Interface

and

Control

State

Machine

+ 1.25V

Reference

Internal

3.2 MHz

Oscillator

CH0

CH1

CH2

CH3

CH4

CH5

CH6

CH7

COM

REFADJ

VREF

AGND

DGND

VDD

nSHDN

SSTRB

DOUT

DIN

SCLK

nCS

+

-

Comparator

x 2.000

Available in ZADCS12x2V versions

IN+

IN-

Available in

ZADCS1242

Available in

ZADCS1282

Available in

ZADCS1222

Starterkit

available