+

±

OUT

Copyright © 2017, Texas Instruments Incorporated

GND

Load

Current

Load

+

±

GND

Frequency (Hz)

-60

-40

-20

0

20

100

1k

10k

100k

1M

21

OPA207

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SBOS826A – DECEMBER 2017 – REVISED DECEMBER 2018

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Typical Application (continued)

8.2.3 Application Curve

Figure 48. Low-Pass Filter Transfer Function

8.3 Other Applications

8.3.1 Precision Low-Side Current Sensing

With low offset voltage and low offset voltage drift over time and temperature the OPA207 is works well for

precision low-side current sensing applications as shown in Figure 49

Figure 49. Precision Low-Side Current Sensing

8.3.2 Precision Buffer With Increased Output Current

The OPA207 can be configured as illustrated in Figure 50 to drive low impedance loads. In Figure 50, the

OPA207 is configured in a gain of +10 V/V, and the output current is boosted by the NPN (2N2904) and PNP

(2N2906) bipolar transistors. For low output voltages the OPA207 supplies the load current directly through the

100-Ω resistor. The bipolar transistors begin to supply current when the voltage drop across the 100-Ω resistor

exceeds approximately 500 mV. Figure 50 illustrates the results for a 50-Ω load resistor driven with a 10-V step

at the output. This results in a 200-mA current supplied by the circuit.