OPA690 datasheet(17/35 Pages) TI

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1/2

OPA2830

1/2

OPA2830

OUT

+5V

-5V

G =

1/2

OPA2890

+5V

DIS

V /2

698W

200W

698W

50W

750W

0.1 F

59W

6.8 F

0.1 F

1/2

OPA2830

1/2

OPA2830

+5V

-5V

G =1+

DIFFERENTIAL OPERATION

OPA2890

SBOS364A – DECEMBER 2007 – REVISED DECEMBER 2007

Figure 51. Differential Inverting Specification and

Test Circuit

Figure 50. DC-Coupled, G = +2V/V, Single-Supply,

Specification and Test Circuit

Again, an additional resistor (50

Ω in this case) is

included directly in series with the noninverting input.

This minimum recommended value provides part of

the

source

resistance

matching

for

the

noninverting input bias current. It is also used to form

a simple parasitic pole to roll off the frequency

response at very high frequencies ( > 500MHz) using

the input parasitic capacitance. The gain resistor (RG)

is AC-coupled, giving the circuit a dc gain of +1V/V,

which puts the input dc bias voltage (2.5V) on the

output as well. The output voltage can swing to within

1V of either supply pin while delivering greater than

40mA output current.

Figure 52. Differential Noninverting Specification

and Test Circuit

Figure

shows

the

inverting

differential

configuration used as the basis for the ±5V and +5V

Typical

Characteristics.

This

circuit

offers

combination of excellent distortion with low quiescent

current for frequencies below 100kHz.

The other possibility is to use the OPA2890 in a

differential configuration as shown in Figure 52. This

figure

illustrates

the

differential

noninverting

configuration that has the advantage of showing a

high input impedance to any prior stage.

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