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CLC3801 Schematic ( PDF Datasheet ) - Cadeka

Teilenummer CLC3801
Beschreibung (CLC3800 - CLC3802) Standard Definition Video Amplifiers
Hersteller Cadeka
Logo Cadeka Logo 




Gesamt 11 Seiten
CLC3801 Datasheet, Funktion
Data Sheet
Amplify the Human Experience
Comlinear® CLC3800, CLC3801, CLC3802
Triple, Standard Definition Video Amplifiers
www.datasheet4u.com
features
n Integrated 4th-order, 8MHz filters
n Integrated 6, 9, or 12dB video drivers
n 8.8mA total supply current
n 0.05%/0.02˚ differential gain/phase
error
n DC coupled inputs
n AC or DC coupled outputs
n DC-coupled outputs remove the need
for AC-coupling capacitors
n Each channel can drive 2Vpp into 1 or 2
video loads (150Ω or 75Ω)
n 0.1% THD
n Operates from 3V to 7V supplies
n Pb-free SOIC-8 or DFN-8 packages
Applications
n Cable or satellite set-top-box (STB)
n Portable DVD players
n DVD players
n Portable media players with video out
n Video on demand
n Personal video recorders
General Description
The CLC3800 (6dB), CLC3801 (9dB), and CLC3802 (12dB) are triple low cost
video amplifiers capable of driving 2Vpp into 1 (150Ω) or 2 (75Ω) video loads.
The CLC3800, CLC3801, and CLC3802 feature integrated 8MHz, 4th-order
low pass filters designed to cleanly pass standard definition video signals
while filtering out noise and other unwanted signals , resulting in a crisper,
cleaner video signal. The 4th-order filters provide improved image quality
when compared to 2nd-order passive filtering solutions.
The CLC3800 video amplifier offers a fixed gain of 6dB. This integrated
gain compensates for the voltage drop inherent in properly terminated video
loads; ensuring a 1Vpp video signal is present at the load. If additional gain
is required, the CLC3801 video amplifier offers a fixed gain of 9dB and the
CLC3802 offers 12dB.
All three video amplifiers can be driven by DC-coupled signals. Thier outputs
can drive either AC- or DC-coupled loads.
These video amplifiers operate from 3V to 7V supplies and consume 8.8mA of
supply current, making them well suited for battery powered devices.
Functional Block Diagram
IN1
Gain
OUT1
IN2
Gain
OUT2
IN3
Gain
OUT3
Ordering Information
8MHz, 4th Order
Low Pass Filter
CLC3800 - 6dB
CLC3801 - 9dB
CLC3802 - 12dB
Part Number
Gain Package
Pb-Free RoHS Compliant
CLC3800ISO8X 6dB SOIC-8
Yes
Yes
CLC3801ISO8X 9dB SOIC-8
CLC3802ISO8X12dB SOIC-8
Yes
Yes
Yes
Yes
CLC3800ILP8X* 6dB DFN-8
Yes
Yes
CLC3801ILP8X* 9dB DFN-8
Yes
Yes
CLC3802ILP8X* 12dB DFN-8
Yes
Yes
Preliminary, contact CADEKA for availablility. *Future product offering.
Moisture sensitivity level for all parts is MSL-1.
Operating Temperature Range
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
Packaging Method
Reel
Reel
Reel
Reel
Reel
Reel
©2008 CADEKA Microcircuits LLC
www.cadeka.com






CLC3801 Datasheet, Funktion
Data Sheet
Application Information
Basic Operation
The CLC3800, CLC3801, and CLC3802 are 3-channel video
amplifiers that operate with single supply voltages from 3V
to 7V. They are designed to accept DC-coupled inputs and
wwwwil.ldadtraisvheeeAt4Cu-.coormDC-coupled outputs. Each channel inte-
grates a DC offset, 4th order Butterworth filters, and fixed
gain video drivers. The filtering is appropriate for standard
definition video signals and has a -3dB cutoff of 8.6MHz.
This cutoff provides an excellent compromise between flat
in-band response and high frequency noise reduction. The
input signals are level shifted prior to the input filters and
output amplifiers.
Inputs: DC-Coupled
The inputs must be DC-coupled. Many DACs provide a
current output that is resistively terminated to ground.
These DACs are conveniently DC-coupled to the inputs of
the CLC3800, CLC3801, or CLC3802 as shown in Figure 1.
DC-coupled inputs use fewer components and lowers the
overall system cost.
R or Y
Video
DAC/
Encoder
G or PB
B or PR
DAC Load Resistors
per Video DAC/Encoder specs
1
IN1
8
OUT1
+3V or +5V
1.0µF
2
IN2
7
OUT2
CLC3800
3
IN3
6
OUT3
4
+Vs
0.1µF
5
GND
Figure 1. Typical Input Configuration
The input termination/source resistance is set by the ap-
plication. Any value up to several kΩ can be used. Lower
values reduce noise, but if higher values are needed, there
is little effect on filter shape or distortion performance of
the CLC380x. If the CLC380x is located on the same board
as the video source, and within a few inches, the input
termination resistance is determined by the requirements
of the Video DAC or Encoder. If a cable is needed to con-
nect the CLC380x to the video source, the termination must
match the cable impedance which is 75Ω for standard vid-
eo cable.
The CLC380x Family of video amplifiers add a DC offset,
raising the input signal by approximately 330mV. For ex-
ample, when 0V is applied to the input, the output becomes
approximately 330mV above ground. This offset eliminates
sync tip clipping. Figure 2 illustrates a typical DC-coupled
input signal and resulting output signal after exiting the
CLC3800.
2.39V
Output Signal
1.02V
0.32V
0.02V
0.00V
Input Signal
0.97V
0.35V
Figure 2. Typical DC-coupled Signal for CLC3800
The input voltage range is typically 0V to 1.4V for the
CLC3800 at 5V supply. Due to the internal fixed gain of 6dB
(for the CLC3800) and the internal level shift of nominally
330mV, the VIN range is generally limited by the output.
VIN and VOUT are fully detailed in the Electrical Character-
istics section.
Outputs: AC- or DC-Coupled
Each channel of the CLC3800, CLC3801, and CLC3802 can
drive either AC- or DC-coupled loads. Each channel can
drive single or dual video loads, 150Ω (1 video load) or
75Ω (2 video loads). Figure 3 shows the typical configura-
tion for driving either AC- or DC-coupled loads.
With DC-coupled loads, AC-coupling capacitors are not
used. Match the series termination resistors to the typi-
cal cable impedance, 75Ω for standard video cable. Keep
the output connection to the series termination resistors
as short as possible. If driving 2 video loads, place both
resistors close to the CLC3800.
With AC-coupled loads, use an AC-coupling capacitor of
at least 220μF in a 75Ω environment. A value of at least
220μF will ensure that low frequencies are passed, pre-
venting video droop across the line, referred to as “tilt”.
©2007-2008 CADEKA Microcircuits LLC
www.cadeka.com 6

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