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OPA699

53.6

Ω

6

I

VH

V

V

O

V

V

IN

I

VL

1.5k

Ω

3

2

4

7

8

5

1.5k

Ω

523

Ω

976

Ω

523

Ω

R

G

150

Ω

R

F

750

Ω

500

Ω

0.1

µF

0.1

µF

0.1

µF

+

2.2

µF

0.1

µF

V

0.1

µF

0.1

µF

S0036-02

WIDEBAND INVERTING OPERATION

OPA699

-5V

V

I

-2V

+5V

+2V

R

M

68.1

Ω

R

F

750

Ω

R

G

187

Ω

500

Ω

0.1

µF

R

T

169

Ω

V

H

V

L

V

O

50

Ω Source

S0037-02

OPA699M

SGLS289A – MAY 2005 – REVISED MARCH 2006

APPLICATION INFORMATION (continued)

the dual-supply circuit usually uses four to reference the limit voltages to ground. While this circuit shows +5-V

operation, the same circuit may be used for single supplies up to +12 V.

Figure 48. AC-Coupled, Single Supply Amplifier

Operating the OPA699 as an inverting amplifier has several benefits and is particularly useful when a matched

50-

Ω source and input impedance are required. Figure 49 shows the inverting gain of –4 V/V circuit used as the

basis of the inverting mode typical characteristics.

Figure 49. Inverting G = –4 Specifications and Test Circuit

In the inverting case, only the feedback resistor appears as part of the total output load in parallel with the actual

load. For a 500-

Ω load used in the typical characteristics, this gives a total load of 329 Ω in this inverting

18

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