OPA348_15 Datasheet, PDF (8/32 Pages) Texas Instruments – 1MHz, 45uA, CMOS, Rail-to-Rail OPERATIONAL AMPLIFIERS Value Line

OPA348
OPA2348
OPA4348
SBOS213G – NOVEMBER 2001 – REVISED MARCH 2013
www.ti.com
APPLICATION INFORMATION
The OPA348 series op amps are unity-gain stable
and suitable for a wide range of general-purpose
applications.
The OPA348 series features wide bandwidth and
unity-gain stability with rail-to-rail input and output for
increased dynamic range. Figure 19 shows the input
and output waveforms for the OPA348 in unity-gain
configuration. Operation is from a single +5V supply
with a 100kΩ load connected to V_S/2. The input is a
5V_PP sinusoid. Output voltage is approximately
4.98V_PP.
Power-supply pins should be bypassed with 0.01μF
ceramic capacitors.
Output (Inverted on Scope)
5V
G = +1V/V, V_S = +5V
COMMON-MODE VOLTAGE RANGE
The input common-mode voltage range of the
OPA348 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. The N-channel pair
is active for input voltages close to the positive rail,
typically (V+) – 1.2V to 300mV above the positive
supply, while the P-channel pair is on for inputs from
300mV below the negative supply to approximately
(V+) – 1.4V. There is a small transition region,
typically (V+) – 1.4V to (V+) – 1.2V, in which both
pairs are on. This 200mV transition region, shown in
Figure 20, can vary ±300mV with process variation.
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.
0V
20ms/div
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
feature of the OPA348 series. In addition, all
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.
OFFSET VOLTAGE
vs FULL COMMON-MODE VOLTAGE RANGE
2
1.5
1
0.5
0
-0.5
-1
V-
V+
-1.5
-2
-0.5 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5
Common-Mode Voltage (V)
Figure 20. Behavior of Typical Transition Region
at Room Temperature
8
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