Texas Instruments THS3201 Evaluation Module THS3201EVM THS3201EVM Fiche De Données
Codes de produits
THS3201EVM
SINGLE-SUPPLY OPERATION
+
-
75
Ω
75
Ω
75
Ω
75
Ω
75
Ω
n Lines
V
O(1)
V
O(n)
THS3201
75-
Ω
Transmission Line
V
I
768
Ω
768
Ω
±
7.5 V
±
7.5 V
ADC DRIVER APPLICATION
_
+
THS3201
49.9
Ω
50
Ω
Source
V
I
+V
S
R
F
768
Ω
R
G
768
Ω
+V
S
2
+V
S
2
_
+
THS3201
287
Ω
50
Ω
Source
V
I
V
S
R
F
576
Ω
+V
S
2
+V
S
2
60.4
Ω
R
G
50
Ω
R
T
50
Ω
R
T
49.9
Ω
49.9
Ω
VIDEO HDTV DRIVERS
THS3201
47pF
CM
ADC
47pF
1:n
24.9
Ω
V
S+
R
F
V
S-
V
IN
R
G
0.1
µ
F
0.1
µ
F
24.9
Ω
R
OUT
0.1
µ
F
R
T
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SLOS416C – JUNE 2003 – REVISED JUNE 2009
The THS3201 has the capability to operate from a
single supply voltage ranging from 6.6 V to 15 V.
When operating from a single power supply, care
must be taken to ensure the input signal and amplifier
are biased appropriately to allow for the maximum
output voltage swing. The circuits shown in
single supply voltage ranging from 6.6 V to 15 V.
When operating from a single power supply, care
must be taken to ensure the input signal and amplifier
are biased appropriately to allow for the maximum
output voltage swing. The circuits shown in
demonstrate methods to configure an amplifier in a
manner conducive for single-supply operation.
manner conducive for single-supply operation.
Figure 58. Video Distribution Amplifier
Application
The THS3201 can be used as a high-performance
ADC driver in applications like radio receiver IF
stages, and test and measurement devices. All
high-performance ADCs have differential inputs. The
THS3201
ADC driver in applications like radio receiver IF
stages, and test and measurement devices. All
high-performance ADCs have differential inputs. The
THS3201
can
be
used
in
conjunction
with
a
transformer as a drive amplifier in these applications.
and
show
two
different
approaches.
In
, a transformer is used after the amplifier
to convert the signal to differential. The advantage of
this approach is fewer components are required.
R
this approach is fewer components are required.
R
OUT
and R
T
are required for impedance matching
the transformer.
Figure 57. DC-Coupled Single-Supply Operation
The exceptional bandwidth and slew rate of the
THS3201 matches the demands for professional
video and HDTV. Most commercial HDTV standards
requires a video passband of 30-MHz. To ensure
high signal quality with minimal degradation of
performance, a 0.1-dB gain flatness should be at
least 7x the passband frequency to minimize group
delay
THS3201 matches the demands for professional
video and HDTV. Most commercial HDTV standards
requires a video passband of 30-MHz. To ensure
high signal quality with minimal degradation of
performance, a 0.1-dB gain flatness should be at
least 7x the passband frequency to minimize group
delay
variations—requiring
210-MHz
0.1-dB
frequency flatness from the amplifier. High slew rates
ensure there is minimal distortion of the video signal.
ensure there is minimal distortion of the video signal.
Figure 59. Differential ADC Driver Circuit 1
Component video and RGB video signals require fast
transition times and fast settling times to keep a high
signal quality. The
transition times and fast settling times to keep a high
signal quality. The
, for example, is a
In
, a transformer is used before two
240-MSPS video digital-to-analog converter (DAC)
amplifiers to convert the signal to differential. The two
and has a transition time approaching 4 ns. The
amplifiers then amplify the differential signal. The
THS3201 is a perfect candidate for interfacing the
advantage to this approach is each amplifier is
output of such high-performance video components.
required to drive half the voltage as before. R
T
is
used to impedance match the transformer.
Copyright © 2003–2009, Texas Instruments Incorporated
17
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