herunterladen
PGA280
Gain
Network
ADC
(ADS1259)
+5V
+15V
-15V
Switch
Matrix
and
100 A
Source
Sinkand
Buffer
m
ControlRegister
7xGPIO SPIInterface
INP2
INN2
INP1
INN1
Address
MUX
SPI
PGA280
PGA280
www.ti.com
................................................................................................................................................ SBOS487A –JUNE 2009–REVISED SEPTEMBER 2009
Zerø-Drift, High-Voltage,
Programmable Gain INSTRUMENTATION AMPLIFIER
Check for Samples: PGA280
1
FEATURES
DESCRIPTION
23
• WIDE INPUT RANGE: ±15.5V at ±18V SUPPLY
The PGA280 is a high-precision instrumentation
amplifier with digitally-controllable gain and signal
• BINARY GAIN STEPS: 128V/V to 1/8V/V
integrity test capability. This device offers low offset
• ADDITIONAL SCALING FACTOR: 1V/V and
voltage, near-zero offset and gain drift, excellent
1⅜V/V
linearity, and nearly no 1/f noise with superior
• LOW OFFSET VOLTAGE: 3μV at G = 128
common-mode and supply rejection to support
high-resolution precision measurement. The 36V
• NEAR-ZERO LONG-TERM DRIFT OF OFFSET
supply capability and wide, high-impedance input
VOLTAGE
range comply with requirements for universal signal
• NEAR-ZERO GAIN DRIFT: 0.5ppm/°C
measurement.
• EXCELLENT LINEARITY: 1.5ppm
Special circuitry prevents inrush currents from
• EXCELLENT CMRR: 140dB
multiplexer (MUX) switching. In addition, the input
• HIGH INPUT IMPEDANCE
switch matrix enables easy reconfiguration and
system-level diagnostics—overload conditions are
• VERY LOW 1/f NOISE
indicated.
• DIFFERENTIAL SIGNAL OUTPUT
The configurable general-purpose input/output
• OVERLOAD DETECTION
(GPIO) offers several control and communication
• INPUT CONFIGURATION SWITCH MATRIX
features. The SPI can be expanded to communicate
• WIRE BREAK TEST CURRENT
with more devices, supporting isolation with only four
ISO couplers. The PGA280 is available in a
• EXPANDABLE SPI™ WITH CHECKSUM
TSSOP-24 package and is specified from –40°C to
• GENERAL-PURPOSE I/O PORT
+105°C.
• TSSOP-24 PACKAGE
RELATED PRODUCTS
APPLICATIONS
FEATURES PRODUCT
• HIGH-PRECISION SIGNAL INSTRUMENTATION
23-bit resolution, ΔΣ analog-to-digital converter ADS1259
• MULTIPLEXED DATA ACQUISITION
Chopper-stabilized instrumentation amplifier,
INA333
RR I/O, 5V single-supply
• HIGH-VOLTAGE ANALOG INPUT AMPLIFIER
High-precision PGA, G = 1, 10, 100, 1000 PGA204
• UNIVERSAL INDUSTRIAL ANALOG INPUT
High-precision PGA, JFET Input, G = 1, 2, 4, 8 PGA206
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2SPI is a trademark of Motorola.
3All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2009, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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