OPA835 datasheet(7/21 Pages) TI1

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VIN

VREF

½ OPA2834

VS-

VOUT

VREF

GVSIG

VREF

VSIG

VS+

OPA2834

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SBOS973 – JUNE 2019

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8 Detailed Description

8.1 Overview

The OPA2834 bipolar-input operational amplifier offers excellent bandwidth of 50 MHz with ultra-low THD of

0.00002% at 1 kHz. The device can swing to within 100 mV of the supply rails while driving a 5-kΩ load. The

input common-mode of the amplifier can swing to 200 mV below the negative supply rail. This level of

performance is achieved at 170 µA of quiescent current per amplifier channel.

8.2 Functional Block Diagrams

Figure 1. Noninverting Amplifier

Figure 2. Inverting Amplifier

8.3 Feature Description

8.3.1 Input Common-Mode Voltage Range

When the primary design goal is a linear amplifier circuit with high CMRR, do not violate the input common-mode

voltage range (VICR) of the op amp. The typical specifications are 0.2 V below the negative rail and 1.1 V below

the positive rail. The limits cover all process variations, and most devices are better than specified.

Assuming the op amp is in linear operation, the voltage difference between the input pins is small (ideally 0 V);

and the input common-mode voltage is analyzed at either input pin with the other input pin assumed to be at the

same potential. The voltage at VIN+ is simple to evaluate. In a noninverting configuration, as shown in Figure 1,

the input signal, VIN, must not violate the VICR. In an inverting configuration, as shown in Figure 2, the reference

voltage, VREF, must be within the VICR.

The input voltage limits have fixed headroom to the power rails and track the power-supply voltages. For a 5-V

supply, the linear input voltage ranges from –0.2 V to 3.9 V and –0.2 V to 1.6 V for a 2.7-V supply. The delta

headroom from each power-supply rail is the same in either case: –0.2 V and 1.1 V.

OPA835 Datasheet(PDF) 7 Page - Texas Instruments