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OPA4347EA2K5 Datasheet(PDF) 7 Page - Texas Instruments

Part # OPA4347EA2K5
Description  microPower, Rail-to-Rail Operational Amplifiers
Download  33 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

OPA4347EA2K5 Datasheet(HTML) 7 Page - Texas Instruments

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OPA347, 2347, 4347
7
SBOS167D
www.ti.com
APPLICATIONS INFORMATION
The OPA347 series op amps are unity-gain stable and can
operate on a single supply, making them highly versatile and
easy to use.
Rail-to-rail input and output swing significantly increases dy-
namic range, especially in low supply applications. Figure 1
shows the input and output waveforms for the OPA347 in
unity-gain configuration. Operation is from VS = +5V with a
100k
Ω load connected to V
S/2. The input is a 5VPP sinusoid.
Output voltage is approximately 4.995VPP.
Power-supply pins should be bypassed with 0.01
µF ceramic
capacitors.
OPERATING VOLTAGE
The OPA347 series op amps are fully specified and en-
sured from 2.5V to 5.5V. In addition, many specifications
apply from –55
°C to +125°C. Parameters that vary signifi-
cantly with operating voltages or temperature are shown in
the Typical Characteristics.
RAIL-TO-RAIL INPUT
The input common-mode voltage range of the OPA347
series extends 200mV beyond the supply rails. This is
achieved with a complementary input stage—an N-channel
input differential pair in parallel with a P-channel differential
pair, as shown in Figure 2. The N-channel pair is active for
input voltages close to the positive rail, typically (V+) – 1.3V
to 200mV above the positive supply, while the P-channel pair
is on for inputs from 200mV below the negative supply to
approximately (V+) – 1.3V. There is a small transition region,
typically (V+) – 1.5V to (V+) – 1.1V, in which both pairs are
on. This 400mV transition region can vary 300mV with
process variation. Thus, the transition region (both stages
on) can range from (V+) – 1.65V to (V+) – 1.25V on the low
end, up to (V+) – 1.35V to (V+) – 0.95V on the high end.
Within the 400mV transition region PSRR, CMRR, offset
voltage, and offset drift may be degraded compared to
operation outside this region. For more information on de-
signing with rail-to-rail input op amps, see Figure 3,
Design
Optimization with Rail-to-Rail Input Op Amps.
FIGURE 2. Simplified Schematic.
FIGURE 1. Rail-to-Rail Input and Output.
V
BIAS1
V
BIAS2
V
IN+
V
IN
Class AB
Control
Circuitry
V
O
V–
(Ground)
V+
Reference
Current
Input
Output (inverted on scope)
5V
1V/div
0V
G = +1, V
S = +5V
20
µs/div


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