Information

6 | Signal Chain Guide 2013 Texas Instruments
Amplifiers and Comparators
Operational Amplifiers
Get more information: www.ti.com/product/OPA172
10-MHz, Low-Noise, RRO, 36 V Operational Amplifier in MicroPackages
OPA172
The OPA172 family of single, dual and quad op amps are a series of 36 V low noise
operational amplifiers that feature single supply, and MicroPackages with the ability to
operate on supplies ranging from +2.7 V (±1.35 V) to +36 V (±18 V). They offer good
offset, drift and bandwidth with low quiescent current. All versions have identical speci
-
fications for maximum design flexibility.
Unlike most op amps, which ar
e specified at only one supply voltage, the OPA172
family of op amps are specified from +2.7 V to +36 V. Input signals beyond the supply
rails will not cause phase reversal and the OPA172 family is stable with capacitive loads
of 300 pF. The input can go 100 mV below the negative rail and within 2 V of the top rail
for normal operation.
System block diagram
Key Features
• Supplyrange:+2.7Vto+36V,
±1.3 5 V to ±18 V
•
MicroPackages:SingleinSC-70,
dual in MSOP-8
•
Lownoise:8nV/
√
—
Hz
•Inputoffsetvoltage:1mV
•RFIfilteredinputs
•Inputrangeincludesthenegativesupply
•Inputrangeoperatestopositivesupply
•Outputshortcircuitcurrent:80mAtyp
•Rail-to-railoutput
•GainBandwidth:10MHz
•Lowquiescentcurrent:1.6mAperampmax
•Highcommon-moderejection:120dB
Applications
•Trackingamplifierinpowermodules
•Merchantpowersupplies
•Transduceramplifier
•Bridgeamplifier
•Temperaturemeasurements
•Straingageamplifier
•Precisionintegrator
•Batterypoweredinstruments
•Testequipment
• Activefilters
DC/DC Converter Isolated Power DC/DC Converter
24 V
Communication
Fieldbus IN
Electrical Isolation
Field Side
Control Backplane
Low Noise Power
Power Management: Exists on
All Modules
Group Isolated Analog Input Module
Per Channel Isolated Analog Input Module
AMP
Protection
Protection
±5 V, ±10 V
0–5 V, 0–10 V
4–20 mA
0–20 mA
From Sensors
Group Isolated Analog Input Module
Digital
Isolation
Digital
Isolation
Controller
Interface
Memory
Buffer
HART
ADC
V
REF
PGA
MUX
Buffer
Protection
Protection
AMP
Controller
Interface
Memory
Digital
Isolation
Digital
Isolation
ADC
ADC
±5 V, ±10 V
0–5 V, 0–10 V
4–20 mA
0–20 mA
Field Inputs From Sensors
Digital
Isolation
Digital
Isolation
Controller
Interface
Memory
AMP
AMP
Buffer
HART
ADC
MUX
Protection
Protection
V
REF
V+
Temp
Flow
Optical
Pressure
Level
-
+