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OPA690 データシート(PDF) 17 Page - Texas Instruments

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部品番号 OPA690
部品情報  Low-Power, Wideband, Voltage-Feedback OPERATIONAL AMPLIFIER with Disable
PDF  35 Pages
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メーカー  TI [Texas Instruments]
ホームページ  http://www.ti.com
Logo TI - Texas Instruments

OPA690 データシート(HTML) 17 Page - Texas Instruments

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R
G
R
F
1/2
OPA2830
R
G
R
F
1/2
OPA2830
V
IN
R
L
V
OUT
+5V
-5V
G =
D
R
F
R
G
1/2
OPA2890
+5V
+V
S
DIS
V /2
S
698W
200W
V
O
V
D
V
I
698W
50W
R
G
750W
R
F
750W
0.1 F
m
0.1 F
m
59W
+
6.8 F
m
0.1 F
m
R
F
1/2
OPA2830
R
F
1/2
OPA2830
V
IN
R
L
R
G
+5V
-5V
G =1+
D
2R
F
R
G
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
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 +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
51
shows
the
inverting
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 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.
Copyright © 2007, Texas Instruments Incorporated
Submit Documentation Feedback
17
Product Folder Link(s): OPA2890



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