OPA2889 datasheet(17/38 Pages) NSC

17 / 38 page

1/2

OPA2889

+5V

DIS

V /2

698W

200W

698W

50W

750W

0.1 F

59W

6.8 F

0.1 F

1/2

OPA2889

1/2

OPA2889

OUT

+5V

-5V

G =

DIFFERENTIAL OPERATION

1/2

OPA2889

1/2

OPA2889

+5V

-5V

G =1+

OPA2889

www.ti.com ....................................................................................................................................................... SBOS373B – JUNE 2007 – REVISED AUGUST 2008

The other possibility is using the OPA2889 in a

differential configuration as shown in Figure 53. This

figure illustrates the differential noninverting input

configuration which has the advantage of showing a

high input impedance to any prior stage.

Figure 51. DC-Coupled, G = +2, Single-Supply,

Specification and Test Circuit

Figure 52. Differential Inverting Specification and

Again, an additional resistor (50

Ω in this case) is

Test Circuit

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 +1, 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 > 40mA output

current.

Figure 52 shows the inverting input differential

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

Typical

Characteristics.

This

circuit

offers

combination of excellent distortion with low quiescent

current.

Figure 53. Differential Noninverting Specification

and Test Circuit

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