OPA2325 Datasheet, PDF (1/32 Pages) Texas Instruments – Precision, 10-MHz, Low-Noise, Low-Power, RRIO, CMOS Operational Amplifier

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OPA2325
SBOS637 – OCTOBER 2016
OPA2325
Precision, 10-MHz, Low-Noise, Low-Power, RRIO, CMOS Operational Amplifier
1 Features
•1 Precision with Zero-Crossover Distortion:
– Low Offset Voltage: 150 μV (max)
– High CMRR: 114 dB
– Rail-to-Rail I/O
• Wide Bandwidth: 10 MHz
• Quiescent Current: 650 μA/ch
• Single-Supply Voltage Range: 2.2 V to 5.5 V
• Low Input Bias Current: 0.2 pA
• Low Noise: 9 nV/√Hz at 10 kHz
• Slew Rate: 5 V/μs
• Unity-Gain Stable
2 Applications
• High-Z Sensor Signal Conditioning
• Transimpedance Amplifiers
• Test and Measurement Equipment
• Programmable Logic Controllers (PLCs)
• Motor Control Loops
• Communications
• Input, Output ADC and DAC Buffers
• Active Filters
3 Description
The OPA2325 device is a dual, precision, low-voltage
complementary metal oxide semiconductor (CMOS)
operational amplifier optimized for very low noise and
wide bandwidth when operating on a low quiescent
current of only 650 μA.
The OPA2325 features a linear input stage with zero-
crossover distortion that delivers excellent common-
mode rejection ratio (CMRR) of typically 114 dB over
the entire input range. The input common-mode
range extends 100 mV beyond the negative and
positive supply rails. The output voltage typically
swings within 10 mV of the rails.
The zero-crossover distortion combined with wide
bandwidth (10 MHz), high slew rate (5 V/µs), and low
noise (9 nV/√Hz) make the OPA2325 a very good
successive-approximation register (SAR) analog-to-
digital converter (ADC) input driver amplifier. The low
offset, and 0.2-pA input bias current make this device
ideal for a wide range of precision applications with
high-impedance sensors. The unique feature of
interfacing to high-impedance sensors on the input
and being able to drive ADC inputs with very little
distortion make the OPA2325 suitable for various
data acquisition and process control applications.
In addition, the OPA2325 has a wide supply voltage
range from 2.2 V to 5.5 V with excellent power-supply
rejection ratio (PSRR) over the entire supply range,
making the device suitable for precision, low-power
applications that run directly from batteries without
regulation.
Offset Voltage vs Input Common-Mode Voltage
150
125
100
75
50
25
0
±25
±50
±75
±100
±125
V_CM = ±2.85 V
V_CM = 2.85 V
±150
±3
±2
±1
0
1
2
3
V_CM (V)
C003
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
OPA2325
SOIC (8)
3.91 mm × 4.90 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
The OPA2325 as an ADC Driver Amplifier
3.3 V
Input
OPA2325
+
R
C
VREF
ADC
VSS
VDD
5V
Copyright © 2016, Texas Instruments Incorporated
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.