OPA2320-Q1_15 Datasheet, PDF (12/31 Pages) Texas Instruments – Precision, 20-MHz, 0.9-pA, Low-Noise, RRIO,CMOS Operational Amplifier

OPA2320-Q1
SLOS884 – SEPTEMBER 2014
7 Detailed Description
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7.1 Overview
The OPA2320-Q1 operational amplifier (op amp) is unity-gain stable and can operate on a single-supply voltage
(1.8 V to 5.5 V), or a split supply voltage (±0.9 V to ±2.75 V), making it highly versatile and easy to use. The
OPA2320-Q1 device amplifier is fully specified from 1.8 V to 5.5 V and over the extended temperature range of
–40°C to 125°C. Parameters that can exhibit variance with regard to operating voltage or temperature are
presented in the Typical Characteristics section.
7.2 Functional Block Diagram
V(V+)
Charge Pump
Reference
Current
IN+
IN±
VBIAS1
VBIAS2
Class AB
Control
Circuitry
OUT
E-Trim^TM
V(V-)
7.3 Feature Description
7.3.1 Input and ESD Protection
The OPA2320-Q1 device incorporates internal electrostatic discharge (ESD) protection circuits on all pins. In the
case of input and output pins, this protection primarily consists of current-steering diodes connected between the
input and power-supply pins. These ESD protection diodes also provide in-circuit input overdrive protection,
provided that the current is limited to 10 mA as stated in the Absolute Maximum Ratings . Many input signals are
inherently current-limited to less than 10 mA; therefore, a limiting resistor is not required. Figure 29 shows how a
series input resistor (R_(S)) may be added to the driven input to limit the input current. The added resistor
contributes thermal noise at the amplifier input and the value should be kept to the minimum in noise-sensitive
applications.
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