Features two ZMD31010
• Separate digital compensation of sensor offset, sensitivity,
temperature coefficient and non-linearity
• Accommodates differential sensor signal spans from 1.2mV/V
to 60mV/V for two inputs
• Dual ZACwire
TM
one-wire interface
• Internal temperature compensation reference
via bandgap PTAT*
• Optional sequential output of both temperature and bridge
readings two ZACwire
TM
digital output
• Output options: ratiometric analog voltage, absolute analog
voltage, digital one-wire-interface
• Supply voltage 2.7V to 5.5V, with external JFET 5.5V to 30V
• Current consumption 2mA
• Operation temperature -50°C to +150°C
• Fast response time: 1ms
• High voltage protection up to 30V with external JFET
• Chopper stabilized true differential ADC
• Buffered and chopper stabilize output DAC
*Proportional to absolute temperature
• ZMD31010 Development Kit can be used
• Support for industrial mass calibration will be available
• Quick circuit customization possible for large production volumes
Application Circuit
Benefits
The ZMD31012 combines the benefits of two single ZMD31010.
• No external trimming components required
• PC-controlled configuration and calibration via one-wire interface
– simple, low cost
• High accuracy (±0.1% FSO @ -25°C to 85°C;
±0.25% FSO @ -40°C to 125°C)
• Single pass calibration – quick and precise
Due to the two independent channels the ZMD31012 provides
a perfect fit for the following selected samples:
• Applications that require redundancy
• Measurement of differential pressure
• Flow Sensors
Brief Description
The ZMD31012 consists of two ZMD31010 dies in a standard
SSOP14 packages. ZMD31012 is a CMOS integrated circuit, which
enables easy and precise calibration of resistive bridge sensors via
EEPROM. When mated to a resistive bridge sensor, it will digitally
correct offset and gain with the option to correct offset and gain
coefcients and linearity over temperature. A second compensa-
tion can be enabled for temperature coefcients of gain or offset
or bridge linearity. ZMD31012 communicates via ZMD’s ZACwire
TM
serial interface to the host computer and is easily mass calibrated in
a Windows
®
environment.
Once calibrated, the output SIG
TM
pin can provide selectable 0V to
1V, rail-to-rail ratiometric analog output, or digital serial output of
bridge data with optional temperature data.
The Analog Mixed Signal Company
ZMD31012
RBic
2
Lite
™
Two Low-cost Sensor Signal Conditioners
ZMD31010 Chips in One Package
P R E L I M I N A RY
