9 Application and Implementation

Note

Information in the following applications sections is not part of the TI component specification,

and TI does not warrant its accuracy or completeness. TI’s customers are responsible for

determining suitability of components for their purposes, as well as validating and testing their design

implementation to confirm system functionality.

9.1 Application Information

The OPAx205 are unity-gain stable operational amplifiers with very low offset voltage, offset voltage drift, voltage

noise, current noise and power consumption. These features make this device family a great choice for a variety

of space-constrained and power-constrained systems.

9.2 Typical Applications

9.2.1 High-Precision Signal-Chain Input Buffer

A common application for the OPAx205 is an input buffer for the signal chain of a data acquisition (DAQ) or

field instrumentation system. This amplifier family is selected because of the low offset and drift that maintain

system accuracy across a variety of operating conditions. The low power consumption of the OPAx205 enables

the device to be used in battery-operated or high-density applications, where thermal dissipation is difficult. The

low 1/f (flicker) noise and broadband noise allow for higher-accuracy signal chains, such as those using a 24-bit

delta-sigma analog-to-digital converter (ADC). If a higher sampling rate is needed, the OPAx205 can be paired

with a fully differential amplifier, such as the THP210, to drive the ADC inputs. Figure 9-1 shows the OPA2205

configured as an input buffer to a differential ADC driver.

+

±

+7 V

2.4 k

OPA2205

í7 V

+

±

+7 V

OPA2205

í7 V

2.4 k

+

±

+7 V

THP210

í7 V

1.1 nF

3 k

3 k

IN+

INí

470 pF

470 pF

750

750

100

100

1 nF

Figure 9-1. OPA2205 Configured as a DAQ Input Buffer

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OPA205, OPA2205

SBOS962C – APRIL 2020 – REVISED JULY 2022

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Product Folder Links: OPA205 OPA2205