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| OPA2889 Datasheet, PDF (17/35 Pages) Burr-Brown (TI) – Dual, Low-Power, Wideband, Voltage Feedback OPERATIONAL AMPLIFIER with Disable | |||
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OPA2889
www.ti.com
+5V
+VS
698W
0.1mF
6.8mF
0.1mF
50W
DIS
VI
698W
VD
1/2
VO 200W
59W
OPA2889
VS/2
RF
750W
RG
750W
0.1mF
Figure 51. DC-Coupled, G = +2, Single-Supply,
Specification and Test Circuit
Again, an additional resistor (50⦠in this case) is
included directly in series with the noninverting input.
This minimum recommended value provides part of
the dc 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.
SBOS373 â JUNE 2007
DIFFERENTIAL OPERATION
Figure 52 shows the inverting input differential
configuration used as the basis for the ±5V and +5V
Typical Characteristics. This circuit offers a
combination of excellent distortion with low quiescent
current.
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.
+5V
1/2
OPA2889
GD =
RF
RG
RG
RF
VIN
RG
RL VOUT
RF
1/2
OPA2889
-5V
Figure 52. Differential Inverting Specification and
Test Circuit
+5V
1/2
OPA2889
GD = 1 + 2RF
RG
RF
VIN
RG
RF
RL
1/2
OPA2889
-5V
Figure 53. Differential Noninverting Specification
and Test Circuit
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