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APPLICATION INFORMATION

Dual-Supply, Non-Inverting Amplifier

OPA689

49.9

Ω

6

I VH

V O

V IN

I

VL

− V S = − 5V

3

2

4

7

8

5

R F

402

Ω

R G

402

Ω

500

Ω

0.1 µ F

0.1 µ F

0.1 µ F

174

Ω

3.01kΩ

1.91kΩ

3.01kΩ

1.91kΩ

0.1 µ F

V

H = +2V

V L = − 2V

2.2 µ F

2.2 µ F

+V S = +5V

Single-Supply, Non-Inverting Amplifier

OPA689M

GAIN +4 STABLE WIDEBAND

VOLTAGE-LIMITING AMPLIFIER

SGLS146B – MARCH 2003 – REVISED DECEMBER 2006

Figure 30 shows a non-inverting gain amplifier for dual-supply operation. This circuit was used for AC

characterization of the OPA689, with a 50-

Ω source, which it matches, and a 500-Ω load. The power-supply

bypass capacitors are shown explicitly in Figure 30 and Figure 31, but will be assumed in the other figures. The

limiter voltages (VH and VL) and their bias currents (IVH and IVL) have the polarities shown.

Figure 30. DC-Coupled, Dual Supply Amplifier

Figure 31 shows an AC-coupled, non-inverting gain amplifier for single 5-V supply operation. This circuit was

used for AC characterization of the OPA689, with a 50-

Ω source, which it matches, and a 500-Ω load. The

power-supply bypass capacitors are shown explicitly in Figure 30 and Figure 31, but will be assumed in the

other figures. The limiter voltages (VH and VL) and their bias currents (IVH and IVL) have the polarities shown.

Notice that the single-supply circuit can use three resistors to set VH and VL, where the dual-supply circuit

usually uses four to reference the limit voltages to ground.

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