ZADCS146/147

12-Bit, 200ksps, ADC Family

© 2011 Zentrum Mikroelektronik Dresden AG — Rev. 2.0

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The information furnished in this publication is PRELIMINARY and subject to changes without notice.

Brief Description

The ZMDI ZADCS146 and ZADCS147 are 12-Bit

low power analog-to-digital (A/D) converters with

up to 250ksps conversion rate. The converter is

based

on

successive-approximation-register

architecture.

All converters have an 8-channel input multiplexer

and a high-bandwidth a track/hold circuit. All

analog inputs are software configurable as eight /

four/two single ended or four/two/one differential

analog input channels as well as for unipolar or

bipolar output coding.

The ZADCS146 and ZADCS147 operate from a

single +2.7V to +5.25V supply.

The synchronous four wire serial interface

connects directly to a microcontroller using one of

the standards like SPI™, QSPI™, and Microwire™

without external components.

The ZADCS146 and ZADCS147 use either the

external serial-interface clock or an internally

generated

clock

to

perform

successive-

approximation analog-to-digital conversions. The

internal clock mode can be used to run

synchronous conversions on several ZMDI ADCs

in parallel.

The ZADCS 146 is equipped with a high accurate

internal 2.5V reference with an additional external

±1.5% voltage adjustment range.

The device provides a hard-wired shut-down pin

(nSHDN) and software-selectable power-down

modes to automatically shut down the IC at the

end of a conversion. Accessing the serial interface

automatically powers up the ZADCS146 and

ZADCS147. A quick turn-on time allows the device

to be shut down between measurements.

Features



12-Bit resolution SAR ADC



8 channel single or 4 channel diff. inputs



Software configurable uni- or bipolar output code



SPI™/QSPI™, Microwire™ compatible serial

interface



No missing codes



Low power consumption



Internal 2.5V reference (only ZADCS146)



Software programmable power down mode



Single-Supply Operation +2.5V to +5.25V



Benefits



Accurate measurements



Long battery life cycles due to low power

consumption

Available Support



ZADCS146 Kit

- Evaluation Kit for ZADCS146 and ZADCS147

based on ZADCS146 device

- Standalone and PC based operation modus

- USB 2.0 (1.1) compatible

- User Interface for PC operated modus

- Graphical oscilloscope appl. and FFT analyzer

Physical Characteristics



ADC resolution............................ 12 Bit



Conversion rate........................... 200 ksps



Power supply rate ....................... 2.7V to 5.25V



INL............................................... ±1.0 LSB max.



DNL............................................. ±1.0 LSB max.



SINAD ......................................... >70 dB



Standby (idle) current.................. <0.5 µA



Current consumption @ 200 ksps, 3V supply

- with internal reference .............. < 1.2 mA

- without internal reference ......... < 0.9 mA



85°C



20-Pin SSOP package

Temperature range ..................... -25°C to +