ZMD31020
Sensor Signal Conditioner
Datasheet
2. CIRCUIT DESCRIPTION
2.1 Signal Flow
Block diagram of ZMD31050
PGA
MUX
ADC
CMC
DAC
BAMP
TS
EEPROM
ROM
I2C
programmable gain amplifier
multiplexer
analog-to-digital converter
calibration microcontroller
digital-to-analog converter
buffer amplifier
on-chip temperature sensor (pn-junction)
for calibration parameters and configuration
for correction formula and –algorithm
serial interface: I2C 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.
Copyright © 2004, ZMD AG, Rev. 1.6, 2005-05-19
4/19
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ZMD [ Zentrum Mikroelektronik Dresden AG ]
