OPA145 Datasheet, PDF (1/40 Pages) Texas Instruments – High-Precision, Low-Noise, Rail-to-Rail Output, 5.5-MHz JFET Operational Amplifiers

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OPA145, OPA2145, OPA4145
SBOS427 – JUNE 2017
OPAx145 High-Precision, Low-Noise, Rail-to-Rail Output, 5.5-MHz
JFET Operational Amplifiers
1 Features
•1 Best Bandwidth and Slew-Rate-to-Power Ratio:
– Gain-Bandwidth Product: 5.5 MHz
– Slew Rate: 20 V/μs
– Low Supply Current: 475 µA (maximum)
• High Precision:
– Very Low Offset: 150 μV (maximum)
– Very Low Offset Drift: 1 μV/°C (maximum)
• Low Input Bias Current: 2 pA
• Excellent Noise Performance:
– Very Low Voltage Noise: 7 nV/√Hz
– Very Low Current Noise: 0.8 fA/√Hz
• Input-Voltage Range Includes V– Supply
• Single-Supply Operation: 4.5 V to 36 V
• Dual-Supply Operation: ±2.25 V to ±18 V
2 Applications
• Analog I/O Modules
• Battery-Powered Instruments
• Industrial Controls
• Medical Instrumentation
• Photodiode Amplifiers
• Active Filters
• Data Acquisition Systems
• Automatic Test Systems
3 Description
The OPA145, OPA2145, and OPA4145 operational
amplifier (op amp) family is a series of low-power
JFET input amplifiers that feature excellent drift, low
current noise, and pico-ampere input bias current,
making these devices a suitable choice for amplifying
small signals from high-impedance sensors. The rail-
to-rail output swing interfaces to modern, single-
supply, precision analog-to-digital converters (ADCs)
and digital-to-analog converters (DACs). In addition,
the input range that includes V– allows designers to
simplify power management and take advantage of
the single-supply, low-noise JFET architecture.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
SOIC (8)
4.90 mm × 3.91 mm
OPA145
VSSOP (8)
SOT-23 (5)
3.00 mm × 3.00 mm
2.90 mm × 1.60 mm
WSON (8)
3.00 mm × 3.00 mm
SOIC (8)
4.90 mm × 3.91 mm
OPA2145
VSSOP (8)
3.00 mm × 3.00 mm
WSON (8)
3.00 mm × 3.00 mm
TSSOP (14)
5.00 mm × 4.40 mm
OPA4145
SOIC (14)
8.65 mm × 3.91 mm
QFN (16)
4.00 mm × 4.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
OPA145 Excels in 16-bit, 100-kSPS Fully
Differential Transimpedance Imaging Application
R1
50 k
C1
9 pF
+10V
±
OPA145
+
ò ‡ 9REF
GND
Fast Silicon
PIN Photodiode
5A
3.8 pF
2.5 mW/cm²
Photovoltaic Mode
GND
+
OPA145
±
+10V
C2
9 pF
R2
50 k
+10V
±
OPA145
+
GND
R5
22
R3
180
C3
432p
C5
200p
GND
GND
+
OPA145
±
+10V
C4
C6
432p 200p
R4
180
R6
22
2.5 V to 5 V 2.7 V to 3.6 V
REF
AVDD
AINP
ADS8867
AINN
GND
Copyright © 2017, Texas Instruments Incorporated
OPA145 Precision JFET Technology Offers
Excellent Linear Input Impedance
3
1.5
0
-1.5
-3
±20 ±15 ±10 ±5 0
5 10 15 20
Input Common-mode Voltage (V)
C001
1
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. PRODUCTION DATA.