ZADCS1282/1242/1222
12-Bit, 200ksps, Serial Output ADC Family
Datasheet
Features
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.
•
Single Supply Operation:
+ 2.7V … + 5.25V
•
Family approach providing
2 / 4 / 8-Channel Single-Ended or
1 / 2 / 4-Channel Differential Inputs
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.
•
•
•
•
•
•
Up to 200ksps Conversion Rate
± 1 LSB INL and DNL
The 4-wire serial interface connects directly to SPI™/
(QSPI™ and MICROWIRE™) devices without external
logic.
No Missing Codes
> 70 dB SINAD
True fully differential Operation
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.
Software-Configurable Unipolar or
Bipolar output coding
•
Internal 3.2MHz oscillator for independent
operation from external clock
The ZADCS12x2V versions are equipped with a highly
accurate internal 2.5V reference with an additional external
±1.5% voltage adjustment range.
•
•
Internal 2.5V Reference
Low Power
-
-
< 1.2mA (200ksps, 5V supply)
< 0.5μA (power-down mode)
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.
•
•
SPITM / QSPITM / MICROWIRETM - compatible
4-Wire Serial Interface
14 / 16 / 20-Pin SSOP
Applications
•
•
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Data Acquisition
Industrial Process Control
Portable Data Logging
Battery-Powered Systems
Starterkit
available
Functional Block Diagram
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
Available in
ZADCS1222
SAR
8-Channel
Analog
Available in
ZADCS1242
Comparator
Input
IN+
IN-
nCS
+
Serial
Interface
and
Multiplexer
DAC with
inherent
T&H
SCLK
DIN
DOUT
SSTRB
Available in
ZADCS1282
-
Control
State
COM
nSHDN
Internal
3.2 MHz
Oscillator
x 2.000
Machine
+ 1.25V
Reference
VDD
REFADJ
VREF
DGND
AGND
Available in ZADCS12x2V versions
Copyright © 2008, ZMD AG, Rev. 1.1
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. The
Information furnished in this publication is preliminary and subject to changes without notice.
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