ZADCS146 Datasheet, PDF (1/19 Pages) Zentrum Mikroelektronik Dresden AG – 12-Bit, 200ksps, 8-Channel, Serial Output ADC

ZADCS146/ZADCS147
12-Bit, 200ksps, 8-Channel, Serial Output ADC
Datasheet
Features
· Single Supply Operation:
+ 2.7V … + 5.25V
· 8-Channel Single-Ended or
4-Channel Differential Inputs
· Up to 200ksps Conversion Rate
· ± 1 LSB INL and DNL
· No Missing Codes
· 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^TM / QSPI^TM / MICROWIRE^TM - compatible
4-Wire Serial Interface
· 20-Pin SSOP
· Alternate Source for MAX146 / MAX147
Applications
· Data Acquisition
· Industrial Process Control
· Portable Data Logging
· Battery-Powered Systems
Description
ZADCS146 and ZADCS147 are low power, 12-bit, succes-
sive approximation analog-to-digital (A/D) converters with
up to 200ksps conversion rate, 8-channel input multi-
plexer, high-bandwidth track/hold and synchronous serial
interface.
The ADC operates from a single + 2.7V to + 5.25V supply.
Its 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.
Both 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 ZADC146 is equipped with a highly accurate internal
2.5V reference with an additional external ±1.5% voltage
adjustment range.
ZADCS146 / ZADCS147 provide a hard-wired shut-down
pin (nSHDN) pin and software-selectable power-down
modes that can be programmed to automatically shut
down the IC at the end of a conversion. Accessing the
serial interface automatically powers up the IC. A quick
turn-on time allows the device to be shut down between all
conversions.
Starterkit
available
Functional Block Diagram
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
COM
REFADJ
VREF
8-Channel
Analog
Input IN+
Multiplexer
IN-
DAC with
inherent
T&H
SAR
Comparator
+
-
+ 1.25V
Reference
x 2.000
Internal
3.2 MHz
Oscillator
Available in ZADCS146 only
Serial
Interface
and
Control
State
Machine
nCS
SCLK
DIN
DOUT
SSTRB
nSHDN
VDD
DGND
AGND
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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