OPA348 datasheet(8/32 Pages) TI1

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-0.5

Common-Mode Voltage (V)

OFFSET VOLTAGE

vs FULL COMMON-MODE VOLTAGE RANGE

V-

0.5

1.5

2.5

3.5

4.5

5.5

1.5

0.5

-0.5

-1

-1.5

-2

V+

G = +1V/V, V = +5V

20 s/div

Output (Inverted on Scope)

OPA348

OPA2348

OPA4348

SBOS213G – NOVEMBER 2001 – REVISED MARCH 2013

www.ti.com

APPLICATION INFORMATION

COMMON-MODE VOLTAGE RANGE

The OPA348 series op amps are unity-gain stable

and suitable for a wide range of general-purpose

The input common-mode voltage range of the

applications.

OPA348 series extends 200mV beyond the supply

rails. This is achieved with a complementary input

The OPA348 series features wide bandwidth and

stage—an N-channel input differential pair in parallel

unity-gain stability with rail-to-rail input and output for

with a P-channel differential pair. The N-channel pair

increased dynamic range. Figure 19 shows the input

is active for input voltages close to the positive rail,

and output waveforms for the OPA348 in unity-gain

typically (V+) – 1.2V to 300mV above the positive

configuration. Operation is from a single +5V supply

supply, while the P-channel pair is on for inputs from

with a 100k

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

300mV below the negative supply to approximately

5VPP sinusoid. Output voltage is approximately

(V+) – 1.4V. There is a small transition region,

4.98VPP.

typically (V+) – 1.4V to (V+) – 1.2V, in which both

pairs are on. This 200mV transition region, shown in

Power-supply pins should be bypassed with 0.01

μF

Figure 20, can vary ±300mV with process variation.

ceramic capacitors.

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

from (V+) – 1.7V to (V+) – 1.5V on the low end, up to

(V+) – 1.1V to (V+) – 0.9V on the high end. Within the

200mV

transition

region

PSRR,

CMRR,

offset

voltage, offset drift, and THD may be degraded

compared to operation outside this region.

Figure 19. The OPA348 Features Rail-to-Rail

Input/Output

OPERATING VOLTAGE

The OPA348 series op amps are fully specified and

tested from +2.5V to +5.5V. However, supply voltage

may range from +2.1V to +5.5V. Parameters are

tested over the specified supply range—a unique

Figure 20. Behavior of Typical Transition Region

feature of the OPA348 series. In addition, all

at Room Temperature

temperature specifications apply from –40°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.

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