OPA340MDREP datasheet(9/17 Pages) TI

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APPLICATION INFORMATION

Rail-to-Rail Input

V =+5,G=+1,R =10kW

OUT

Operating Voltage

OPA340-EP

OPA2340-EP

OPA4340-EP

www.ti.com ................................................................................................................................................................................................ SBOS433 – AUGUST 2008

apply from –55°C to 125°C. Most behavior remains

OPA340 series operational amplifiers are fabricated

nearly

unchanged

throughout

the

full

operating

on a state-of-the-art 0.6-micron CMOS process. They

voltage range. Parameters that vary significantly with

are unity-gain stable and suitable for a wide range of

operating voltages or temperature are shown in

general-purpose applications. Rail-to-rail input/output

Typical Characteristics.

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

The input common-mode voltage range of the

connected to any point between V+ and ground.

OPA340 series extends 500 mV beyond the supply

rails. This is achieved with a complementary input

Rail-to-rail

input

and

output

swing

significantly

stage—an N-channel input differential pair in parallel

increases dynamic range, especially in low-supply

with a P-channel differential pair (as shown in

applications. Figure 23 shows the input and output

Figure 24). The N-channel pair is active for input

waveforms

for

the

OPA340

unity-gain

voltages

the

positive

rail,

typically

configuration. Operation is from a single 5-V supply

(V+) – 1.3 V to 500 mV above the positive supply,

with a 10-k

Ω load connected to VS/2. The input is a

while the P-channel pair is on for inputs from 500 mV

5-VPP sinusoid. Output voltage is approximately

below

the

negative

supply

approximately

4.98 VPP.

(V+) – 1.3 V. There is a small transition region,

typically (V+) – 1.5 V to (V+) – 1.1 V, in which both

Power-supply pins should be bypassed with 0.01-

µF

pairs are on. This 400-mV transition region can vary

ceramic capacitors.

±300 mV with process variation. Thus, the transition

region (both stages on) can range from (V+) – 1.8 V

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

(V+) – 0.8 V on the high end.

OPA340

series

operational

amplifiers

are

laser-trimmed to reduce the offset voltage difference

between the N-channel and P-channel input stages,

resulting in improved common-mode rejection and a

smooth transition between the N-channel pair and the

P-channel pair. However, within the 400-mV transition

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

THD may be degraded compared to operation

outside this region.

A double-folded cascode adds the signal from the two

input pairs and presents a differential signal to the

Figure 23. Rail-to-Rail Input and Output

class AB output stage. Normally, input bias current is

approximately

200

fA;

however,

input

voltages

exceeding the power supplies by more than 500 mV

can cause excessive current to flow in or out of the

OPA340

series

operational

amplifiers

are

fully

input pins. Momentary voltages greater than 500 mV

specified from 2.7 V to 5 V. Parameters are ensured

beyond the power supply can be tolerated if the

over the specified supply range—a unique feature of

current on the input pins is limited to 10 mA. This is

the OPA340 series. In addition, many specifications

easily accomplished with an input resistor, as shown

in Figure 25. Many input signals are inherently

current-limited to less than 10 mA; therefore, a

limiting resistor is not required.

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Product Folder Link(s): OPA340-EP OPA2340-EP OPA4340-EP

OPA340MDREP Datasheet(PDF) 9 Page - Texas Instruments

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