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OPA2690 Datasheet(PDF) 15 Page - Burr-Brown (TI)

[Old version datasheet] Texas Instruments acquired Burr-Brown Corporation. Click here to check the latest version.
Part No. OPA2690
Description  Dual, Wideband, Voltage-Feedback OPERATIONAL AMPLIFIER with Disable
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Maker  BURR-BROWN [Burr-Brown (TI)]
Homepage  http://www.burr-brown.com
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OPA2690 Datasheet(HTML) 15 Page - Burr-Brown (TI)

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OPA2690
SBOS238D − JUNE 2002 − REVISED DECEMBER 2004
www.ti.com
15
HIGH-PERFORMANCE DAC
TRANSIMPEDANCE AMPLIFIER
High-frequency
DDS
Digital-to-Analog
Converters
(DACs) require a low distortion output amplifier to retain
their SFDR performance into real-world loads. Figure 5
shows a single-ended output drive implementation. The
diagram shows the signal output current(s) connected into
the virtual ground summing junction(s) of the OPA2690,
which is set up as a transimpedance stage or I-V converter.
If the DAC requires that its outputs terminate to a
compliance voltage other than ground for operation, the
appropriate voltage level may be applied to the
noninverting input of the OPA2690. The DC gain for this
circuit is equal to RF. At high frequencies, the DAC output
capacitance (CD in Figure 5) will produce a zero in the
noise gain for the OPA2690 that may cause peaking in the
closed-loop frequency response. CF is added across RF to
compensate for this noise gain peaking. To achieve a flat
transimpedance frequency response, the pole in each
feedback network should be set to:
1
2
pR
FCF
+
GBP
4
pR
FCD
which will give a cutoff frequency f−3dB of approximately:
f*3dB +
GBP
2
pR
FCD
1/2
O P A 2690
1/2
O P A 2690
High−Speed
DAC
V
O =IO RF
−V
O = − IO RF
R
F1
R
F2
C
F1
C
F2
GBP
→Gain Bandwidth
Product (Hz) for the OPA2690
C
D1
C
D2
I
O
−I
O
50
50
Figure 5. DAC Transimpedance Amplifier
WIDEBAND VIDEO MULTIPLEXING
One common application for video speed amplifiers that
include a disable pin is to wire multiple amplifier outputs
together, then select which one of several possible video
inputs to source onto a single line. This simple wired-OR
video multiplexer can be easily implemented using the
OP2690I-14D (SO-14 package only), as shown in
Figure 6.
146
2k
82.5
75
Ω Cable
75
Ω Load
RG−59
82.5
75
402
340
Video 1
+5V
+5V
−5V
1/2
O P A 2 690
1/2
O P A 2 690
146
2k
75
402
340
Video 2
−5V
+5V
V
DIS
DISA
DISB
Figure 6. 2-Channel Video Multiplexer (SO-14 package only)
(1)
(2)


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