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OPA365-Q1_15 Datasheet, PDF (11/26 Pages) Texas Instruments – 50-MHz Low-Distortion High-CMRR Rail-to-Rail I/O, Single-Supply Operational Amplifier | |||
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www.ti.com
OPA365-Q1
OPA2365-Q1
SBOS512C â MARCH 2010 â REVISED APRIL 2012
Rail-to-Rail Input
The OPA365 product family features true rail-to-rail input operation, with supply voltages as low as ±1.1V (2.2V).
A unique zero-crossover input topology eliminates the input offset transition region typical of many rail-to-rail,
complementary stage operational amplifiers. This topology also allows the OPA365 to provide superior common-
mode performance over the entire input range, which extends 100mV beyond both power-supply rails, as shown
in Figure 5. When driving ADCs, the highly linear VCM range of the OPA365 assures that the op amp/ADC
system linearity performance is not compromised.
OFFSET VOLTAGE vs COMMON MODE VOLTAGE
200
VS = ±2.75V
150
100
OPA365
50
0
â50
â100
â150
Competitors
â200
â3
â2
â1
0
1
2
3
Common Mode Voltage (V)
Figure 5. OPA365 has Linear Offset Over the Entire Common-Mode Range
A simplified schematic illustrating the rail-to-rail input circuitry is shown in Figure 6.
VC C + 1. 8 V
VS
Regulated
Charge Pump
VOU T = VC C +1.8V
Patent Pending
Very Low Ripple
IB IA S
Topology
IB IA S
VINâ
VI N +
IBI AS
VOU T
IB IA S
Figure 6. Simplified Schematic
Copyright © 2010â2012, Texas Instruments Incorporated
Product Folder Link(s): OPA365-Q1
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