OPA4172 Datasheet, PDF (21/42 Pages) Texas Instruments – OPAx172 36-V, Single-Supply, 10-MHz, Rail-to-Rail Output Operational Amplifiers

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OPA172, OPA2172, OPA4172
SBOS618H – DECEMBER 2013 – REVISED SEPTEMBER 2015
8.4 Device Functional Modes
8.4.1 Common-Mode Voltage Range
The input common-mode voltage range of the OPAx172 series extends 100 mV below the negative rail and
within 2 V of the top rail for normal operation.
This device can operate with full rail-to-rail input 100 mV beyond the top rail, but with reduced performance within
2 V of the top rail. The typical performance in this range is summarized in Table 3.
Table 3. Typical Performance Range (V_S = ±18 V)
PARAMETER
MIN
TYP
Input Common-Mode Voltage
(V+) – 2
Offset voltage
5
Offset voltage vs temperature (T_A = –40°C to +125°C)
10
Common-mode rejection
70
Open-loop gain
60
Gain bandwidth product (GBP)
4
Slew rate
4
Noise at f = 1 kHz
22
MAX
(V+) + 0.1
UNIT
V
mV
µV/°C
dB
dB
MHz
V/µs
nV/√Hz
8.4.2 Electrical Overstress
Designers often ask questions about the capability of an operational amplifier to withstand electrical overstress.
These questions tend to focus on the device inputs, but may involve the supply voltage terminals or even the
output terminal. Each of these different terminal functions have electrical stress limits determined by the voltage
breakdown characteristics of the particular semiconductor fabrication process and specific circuits connected to
the terminal. Additionally, internal electrostatic discharge (ESD) protection is built into these circuits to protect
them from accidental ESD events both before and during product assembly.
A good understanding of this basic ESD circuitry and its relevance to an electrical overstress event is helpful.
Figure 46 illustrates the ESD circuits contained in the OPAx172 (indicated by the dashed line area). The ESD
protection circuitry involves several current-steering diodes connected from the input and output terminals and
routed back to the internal power-supply lines, where the diodes meet at an absorption device internal to the
operational amplifier. This protection circuitry is intended to remain inactive during normal circuit operation.
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