OPA341_08 datasheet(9/15 Pages) BURR-BROWN

9 / 15 page

OPA341, 2341

SBOS202A

FIGURE 2. Simplified Schematic.

APPLICATIONS INFORMATION

OPA341 series op amps are fabricated on a state-of-the-art

0.6-micron CMOS process. They are unity-gain stable and

suitable for a wide range of general-purpose applications.

Rail-to-rail I/O make them ideal for driving sampling A/D

converters. In addition, excellent ac performance makes

them well suited for audio applications. The class AB output

stage is capable of driving 600

Ω loads connected to any point

between V+ and ground. Rail-to-rail input and output swing

significantly increases dynamic range, especially in low-

supply applications. Figure 1 shows the input and output

waveforms for the OPA341 in unity-gain configuration.

Operation is from a single +5V supply with a 10k

Ω load

connected to VS /2. The input is a 5Vp-p sinusoid. Output

voltage is approximately 4.98Vp-p. Power-supply pins should

be bypassed with 0.01

µF ceramic capacitors.

OPERATING VOLTAGE

OPA341 series op amps are fully specified from +2.7V to

+5.5V. However, supply voltage may range from +2.5V to

+5.5V. Parameters are tested over the specified supply

range—a unique feature of the OPA341 series. In addition,

many specifications apply from –55

°C to +125°C. Most

behavior remains virtually unchanged throughout the full

operating voltage range. Parameters that vary significantly

with operating voltages or temperature are shown in the

Typical Characteristics.

RAIL-TO-RAIL INPUT

The input common-mode voltage range of the OPA341

series extends 300mV beyond the supply rails. This is achieved

with a complementary input stage—an N-channel input dif-

ferential 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

300mV above the positive supply. The P-channel pair is on

for inputs from 300mV below the negative supply to approxi-

mately (V+) – 1.3V.

There is a small transition region, typically (V+) – 1.5V to

(V+) – 1.1V, in which both input pairs are on. This 400mV

transition region can vary

±300mV with process variation.

Thus, the transition region (both stages on) can range from

(V+) – 1.8V to (V+) – 1.4V on the low end, up to (V+) – 1.2V

to (V+) – 0.8V on the high end. Within the 400mV transition

region PSRR, CMRR, offset voltage, offset drift, and THD

may be degraded compared to operation outside this region.

FIGURE 1. Rail-to-Rail Input and Output.

S = 5, G = +1, RL = 10kΩ

µs/div

2V/div

OUT

BIAS1

BIAS2

IN+

IN–

Class AB

Control

Circuitry

V–

(Ground)

ENABLE (CMOS Input)

On = High

Off = Low

V+

Reference

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