OPA365-EP Datasheet, PDF (10/19 Pages) Texas Instruments – 50-MHz Low-Distortion High-CMRR Rail-to-Rail I/O, Single-Supply Operational Amplifier

OPA365-EP
SLOS735 – AUGUST 2011
www.ti.com
Rail-to-Rail Input
The OPA365 features true rail-to-rail input operation, with supply voltages as low as ±1.1 V (2.2 V). 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 100 mV 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
V_S = ±2.75V
150
100
OPA365
50
0
−50
−100
−150
Competitors
−200
−3
−2
−1
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.
V_{C C} + 1. 8 V
V_S
Regulated
Charge Pump
V_{OU T} = V_{C C} +1.8V
Patent Pending
Very Low Ripple
I_{B IA S}
Topology
I_{B IA S}
V_IN−
V_{I N} +
I_{BI AS}
V_{OU T}
I_{B IA S}
Figure 6. Simplified Schematic
10
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