OPA2348-HIREL_15 Datasheet, PDF (10/15 Pages) Texas Instruments – 1-MHz, 45-μA CMOS RAIL-TO-RAIL OPERATIONAL AMPLIFIER

OPA2348-HiRel
SBOS482 – NOVEMBER 2009
www.ti.com
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 2. Behavior of Typical Transition Region at Room Temperature
Rail-to-Rail Input
The input common-mode range extends from (V–) – 0.2 V to (V+) + 0.2 V. For normal operation, inputs should
be limited to this range. The absolute maximum input voltage is 500 mV beyond the supplies. Inputs greater than
the input common-mode range but less than the maximum input voltage, while not valid, do not cause any
damage to the op amp. Unlike some other op amps, if input current is limited the inputs may go beyond the
power supplies without phase inversion, as shown in Figure 3.
V_IN
G = +1V/V, V _S = +5V
5V
V_OUT
0V
10µs/div
Figure 3. No Phase Inversion With Inputs Greater Than Power-Supply Voltage
Normally, input currents are 0.5 pA. However, large inputs (greater than 500 mV beyond the supply rails) can
cause excessive current to flow in or out of the input pins. Therefore, as well as keeping the input voltage below
the maximum rating, it is also important to limit the input current to less than 10 mA. This is easily accomplished
with an input voltage resistor, as shown in Figure 4.
I_OVERLOAD
10mA max
V_IN
5kW
+5V
1/2
OPA2348
V_OUT
Figure 4. Input Current Protection for Voltages Exceeding the Supply Voltage
10
Submit Documentation Feedback
Product Folder Link(s): OPA2348-HiRel
Copyright © 2009, Texas Instruments Incorporated