PGA309-HT Datasheet, PDF (1/27 Pages) Texas Instruments – VOLTAGE OUTPUT PROGRAMMABLE SENSOR CONDITIONER

PGA309-HT
www.ti.com
SBOS687A – OCTOBER 2013 – REVISED DECEMBER 2013
VOLTAGE OUTPUT PROGRAMMABLE SENSOR CONDITIONER
Check for Samples: PGA309-HT
FEATURES
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•2 Complete Bridge Sensor Conditioner
• Voltage Output: Ratiometric or Absolute
• Digital Cal: No Potentiometers/Sensor Trims
• Sensor Error Compensation
– Span, Offset, and Temperature Drifts
• Low Error, Time-Stable
• Sensor Linearization Circuitry
• Temperature Sense: Internal or External
• Calibration Lookup Table Logic
– Uses External EEPROM (SOT23-5)
• Over/Under-Scale Limiting
• Sensor Fault Detection
• +2.7V TO +5.5V Operation
• Small TSSOP-16 Package
APPLICATIONS
• Bridge Sensors
• Remote 4-20mA Transmitters
• Strain, Load, and Weigh Scales
• Automotive Sensors
SUPPORTS EXTREME TEMPERATURE
APPLICATIONS
• Controlled Baseline
• One Assembly and Test Site
• One Fabrication Site
• Available in Extreme (–55°C to 150°C)
Temperature Range ⁽¹⁾
• Extended Product Life Cycle
• Extended Product-Change Notification
• Product Traceability
• Texas Instruments high temperature products
utilize highly optimized silicon (die) solutions
with design and process enhancements to
maximize performance over extended
temperatures. All devices are characterized
and qualified for 1000 hours continuous
operating life at maximum rated temperature.
EVALUATION TOOLS
• Hardware Designer’s Kit (PGA309EVM)
– Temperature Eval of PGA309 + Sensor
– Full Programming of PGA309
– Sensor Compensation Analysis Tool
(1) Custom temperature ranges available
DESCRIPTION
The PGA309 is a programmable analog signal conditioner designed for bridge sensors. The analog signal path
amplifies the sensor signal and provides digital calibration for zero, span, zero drift, span drift, and sensor
linearization errors with applied stress (pressure, strain, etc.). The calibration is done via a One-Wire digital serial
interface or through a Two-Wire industry-standard connection. The calibration parameters are stored in external
nonvolatile memory (typically SOT23-5) to eliminate manual trimming and achieve long-term stability.
The all-analog signal path contains a 2x2 input multiplexer (mux), auto-zero programmable-gain instrumentation
amplifier, linearization circuit, voltage reference, internal oscillator, control logic, and an output amplifier.
Programmable level shifting compensates for sensor dc offsets.
The core of the PGA309 is the precision, low-drift, no 1/f noise Front-End PGA (Programmable Gain Amplifier).
The overall gain of the Front-End PGA + Output Amplifier can be adjusted from 2.7V/V to 1152V/V. The polarity
of the inputs can be switched through the input mux to accommodate sensors with unknown polarity output. The
Fault Monitor circuit detects and signals sensor burnout, overload, and system fault conditions.
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2013, Texas Instruments Incorporated