OPA2348-HIREL Datasheet, PDF (9/14 Pages) Texas Instruments – 1-MHz, 45-μA CMOS RAIL-TO-RAIL OPERATIONAL AMPLIFIER

OPA2348-HiRel
www.ti.com
APPLICATION INFORMATION
SBOS482 – NOVEMBER 2009
OPA2348 op amps are unity-gain stable and suitable for a wide range of general-purpose applications.
The OPA2348 features wide bandwidth and unity-gain stability with rail-to-rail input and output for increased
dynamic range. Figure 1 shows the input and output waveforms for the OPA2348 in unity-gain configuration.
Operation is from a single 5-V supply with a 100-kΩ load connected to V_S/2. The input is a 5-V_PP sinusoid.
Output voltage is approximately 4.98 V_PP.
Power-supply pins should be bypassed with 0.01-μF ceramic capacitors.
Output (Inverted on Scope)
5V
G = +1V/V, V_S = +5V
0V
20µs/div
Figure 1. Rail-to-Rail Input/Output
Operating Voltage
OPA2348 op amps are fully specified and tested from 2.5 V to 5.5 V. However, supply voltage may range from
2.1 V to 5.5 V. Parameters are tested over the specified supply range, a unique feature of the OPA2348. In
addition, all temperature specifications apply from 0°C to 70°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.
Common-Mode Voltage Range
The input common-mode voltage range of the OPA2348 extends 200 mV 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+) – 1.2 V to
300 mV above the positive supply, while the P-channel pair is on for inputs from 300 mV below the negative
supply to approximately (V+) – 1.4 V. There is a small transition region, typically (V+) – 1.4 V to (V+) – 1.2 V, in
which both pairs are on. This 200-mV transition region, shown in Figure 2, can vary ±300 mV with process
variation. Thus, the transition region (both stages on) can range from (V+) – 1.7 V to (V+) – 1.5 V on the low end,
up to (V+) – 1.1 V to (V+) – 0.9 V on the high end. Within the 200-mV transition region, PSRR, CMRR, offset
voltage, offset drift, and THD may be degraded compared to operation outside this region.
Copyright © 2009, Texas Instruments Incorporated
Product Folder Link(s): OPA2348-HiRel
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