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ZMD31020 Datasheet(PDF) 4 Page - Zentrum Mikroelektronik Dresden AG

Part No. ZMD31020
Description  Sensor Signal Conditioner
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Maker  ZMD [Zentrum Mikroelektronik Dresden AG]
Homepage  http://www.zmdi.com
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 4 page
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Copyright © 2004, ZMD AG, Rev. 1.6, 2005-05-19
4/19
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.
ZMD31020
Sensor Signal Conditioner
Datasheet
2.
CIRCUIT DESCRIPTION
Block diagram of ZMD31050
PGA
programmable gain amplifier
MUX
multiplexer
ADC
analog-to-digital converter
CMC
calibration microcontroller
DAC
digital-to-analog converter
BAMP
buffer amplifier
TS
on-chip temperature sensor (pn-junction)
EEPROM
for calibration parameters and configuration
ROM
for correction formula and –algorithm
I
2C
serial interface: I
2
C data I/O, clock
The ZMD31020’s signal path is partly analog (blue) and partly digital (red). The differential signal from the
resistive bridge sensor is pre-amplified by the programmable gain amplifier (PGA). There are 3 different
adjustable gains.
The Multiplexer (MUX) transmits the differential signal or the temperature signal to the ADC in a certain
sequence. (The external temperature sensing diode or the internal temperature sensor can be used optionally.)
The ADC converts the differential signal with 12 bits resolution and the temperature signal with 10 bits resolution
into digital values.
2.1 Signal Flow




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