OPA1688 Datasheet, PDF (21/41 Pages) Texas Instruments – OPA168x SoundPlus 36-V, Single-Supply, 10-MHz, Rail-to-Rail Output Operational Amplifiers

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OPA1688, OPA1689
SBOS724 – SEPTEMBER 2015
9.4 Device Functional Modes
9.4.1 Common-Mode Voltage Range
The input common-mode voltage range of the OPA168x 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 85°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
9.4.2 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 can involve the supply voltage pins or even the output
pin. Each of these different pin functions have electrical stress limits determined by the voltage breakdown
characteristics of the particular semiconductor fabrication process and specific circuits connected to the pin.
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 48 illustrates the ESD circuits contained in the OPA168x (indicated by the dashed line area). The ESD
protection circuitry involves several current-steering diodes connected from the input and output pins 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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