PGA308-Q1 Datasheet, PDF (1/26 Pages) Texas Instruments – Single-Supply, Auto-Zero Sensor Amplifier with Programmable Gain and Offset

PGA308
PGA308
PGA308-Q1
www.ti.com
SBOS599A – MARCH 2012 – REVISED MARCH 2012
Single-Supply, Auto-Zero Sensor Amplifier
with Programmable Gain and Offset
Check for Samples: PGA308-Q1
FEATURES
1
•2 Qualified for Automotive Applications
• AEC-Q100 Qualified with the following results
– Device Temperature Grade 1: -40°C to
+125°C Ambient Operating Temperature
Range
– Device HBM ESD Classification Level H2
– Device CDM ESD Classification Level C3B
• Digital Calibration for Bridge Sensors
• Offset Select: Coarse and Fine
• Gain Select: Coarse and Fine
• Bridge Fault Monitor
• Input Mux for Lead Swap
• Over/Under Scale Limits
• D_OUT/ V_OUT Clamp Function
• Seven Banks OTP Memory
• One-Wire Digital UART Interface
• Operating Voltage: +2.7V to +5.5V
• MSOP-10 and 3mm × 4mm DFN-10 Packages
APPLICATIONS
• Bridge Sensors
• Remote 4-20mA Transmitters
• Strain, Load, Weigh Scales
• Automotive Sensors
EVALUATION TOOLS
• PGA308EVM (Hardware and Software)
– Calibration and Configuration
– Sensor Emulation
DESCRIPTION
The PGA308-Q1 is a programmable analog sensor
signal conditioner. The analog signal path amplifies
the sensor signal and provides digital calibration for
offset and gain. Calibration is done via the 1W pin, a
digital One-Wire, UART-compatible interface. For
three-terminal sensor modules, 1W may be
connected to V_OUT and the assembly programmed
through the V_OUT pin. Gain and offset calibration
parameters are stored onboard in seven banks of
one-time programmable (OTP) memory. The power-
on reset (POR) OTP bank may be programmed a
total of four times.
The all-analog signal path contains a 2×2 input
multiplexer (mux) to allow electronic sensor lead
swapping, a coarse offset adjust, an auto-zero
programmable gain instrumentation amplifier (PGA),
a fine gain adjust, a fine offset adjust, and a
programmable gain output amplifier. Fault monitor
circuitry detects and signals sensor burnout,
overload, and system fault conditions. Over/under-
scale limits provide additional means for system level
diagnostics. The dual-use D_OUT/V_CLAMP pin can be
used as a programmable digital output or as a V_OUT
over-voltage clamp.
For detailed application information, see the PGA308
User's Guide (SBOU069) available for download at
www.ti.com.
VEXC
PGA308
Coarse Offset
7-Bit + Sign
DAC
VREF
VS
4
VREF
10
DOUT/VCLAMP
1
VREF
DOUT
Select
Fine Offset
16-Bit
DAC
VREF
Overscale
3-Bit
DAC
Output Gain
Ref⁽¹⁾
VIN1 5
Bridge
Sensor
VIN2 6
Input
Mux
Fault
Monitor
Front-End
Gain Select
Auto-Zero
PGA
3
GND
Output
Gain
Select
16-Bit
DAC
Fine Gain
Output
Amplifier
Ref⁽¹⁾
3-Bit
DAC
Underscale
NOTE: (1) Ref = VREF or VS selectable.
Digital Interface
(One-Wire)
2
1W
OTP
(7 Banks)
RAM
Scale
Limit
8
VFB
7
VSJ
9
VOUT
1
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
2
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 © 2012, Texas Instruments Incorporated