PGA970 Datasheet, PDF (1/5 Pages) Texas Instruments – Sensor Signal Conditioner

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PGA970 LVDT Sensor Signal Conditioner
PGA970
SLDS201 – JANUARY 2016
1 Features
•1 Analog Features
– Analog Front End for LVDT Sensors
– On-Chip Temperature Sensor
– Programmable Gain
– Two 24-Bit Digital Demodulators
– 24-Bit Auxiliary Analog-to-Digital Converter
– 14-Bit Output DAC
• Digital Features
– Microcontroller Core
– ARM Cortex-M0 at 8 MHz
– On-Chip Oscillator
– Memory
– 8 KBytes FRAM for Program and
Configuration Data
– 2 KBytes RAM for Variables
– 512 Bytes of RAM for Waveform Generator
• Peripheral Features
– Serial Peripheral Interface (SPI)
– One-Wire Interface
– Ratiometric and Absolute Voltage Output
– 4- to 20-mA Current Loop Interface (with
external components)
– Power Management Control
– Analog Low-Voltage Detect
• General Features
– Industrial Temperature Range: –40°C to 125°C
– Power Supply:
– Depletion MOSFET Gate Controller
– ABSMAX: –0.3 to 33 V
– Operational: 3.5 to 30 V
– Package Option: QFP-48
2 Applications
• LVDT Sensor Signal Conditioning
• RVDT Sensor Signal Conditioning
• Resolver Signal Conditioning
• Conductivity Measurement
3 Description
The PGA970 is an interface device for LVDT sensors.
The device incorporates analog front end that directly
connects to the sense element and has voltage
regulators and oscillator. The device also includes
analog-to-digital converters, ARM Cortex-M0
microprocessor and FRAM memory. Sensor
compensation algorithms can be implemented in
software. The PGA970 includes multiple output
interfaces.
Device Information⁽¹⁾
ORDER NUMBER
PACKAGE
BODY SIZE (NOM)
PGA970QPHPR
PGA970QPHPT
QFP (48)
9.00 mm × 9.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Block Diagram
LVDT
SENSOR
C
o
r
e
PI PGA970
REFERENCE
PE
P2
P1
S1P
WAVE
GAIN
WAVEFORM
GENERATOR
PGA
ADC
S1N
S2P
S2N
PGA
ADC
INTERNAL
OSCILLATOR
Digital
Demodulation
Digital
Demodulation
VI
SOFTWARE
AND DATA
MEMORY
8KB FRAM
2KB RAM
512B RAM
CONTROL
AND
STATUS
REGISTERS
External
TEMPERATURE
SENSOR
PGA
INTERNAL
TEMPERATURE
SENSOR
ADC
Digital
Demodulation
DIAGNOSTICS
ARM
CORTEX M0
(PROGRAMMABLE
BY USERS)
POWER MANAGEMENT
OWI
SPI
GPIO
14-bit
DAC
GAIN
DEBUGGER
1
VDD
(3.3 ± 30 V)
MISO/MOSI
CSN/SCK
GPIO1/2
VOUT
COMP
FBN
SWDIO,
SWDCLK
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCT PREVIEW Information. Product in design phase of
development. Subject to change or discontinuance without notice.