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FMS6414
Dual Channel Video Drivers with Integrated Filters
Video Features
• Dual Integrated Video Low Pass reconstruction filters on
outputs
• Integrated output drivers provide low impedance outputs
and deliver 2Vp-p (6dB gain) composite video into 150
Ω
.
• 7.1MHz 4
th
order video filters
• 0.4% differential gain with 0.4° differential phase
• Integrated DC Restore / Clamp Circuitry
General Description
The FMS6414 Dual Channel Video Filter – Driver Chip
offers comprehensive video filtering for set top box or DVD
applications. This part consists of two 4
th
order video Low
Pass Filters for video filtering. This device integrates video
drivers so that it can directly drive to the outside world.
The video signals are filtered at 7.1MHz and buffered to
drive 2Vp-p into AC coupled 150
Ω
loads with up to 35pF of
load capacitance at the output pin. The filters approximate a
4th-order Butterworth characteristic with an optimization
toward low overshoot and flat group delay. Likewise, they
are capable of driving a 75
Ω
load at 1Vp-p. There is an
option for the video output to be DC coupled which limits
the drive to 1 output.
Applications
•
•
•
•
•
•
•
CCTV
Cable and Satellite Set top boxes
DVD players
Televisions
HDTV
Personal Video Recorders (PVRs)
Video On Demand (VOD)
Functional Block Diagram
1
YIN
SYNC STRIP,
REF, AND TIMING
x2
YOUT
8
gM
2
1V
NC (Reserved)
VCC_VIDEO
7
FMS6414
3
6
GND_VIDEO
NC (Reserved)
gM
1V
4
CIN
x2
COUT
5
REV. 1.0.1 6/27/02
PRODUCT SPECIFICATION
FMS6414
Pin Description
FMS6414
8-Pin SOIC (S08)
1
YIN
Y_OUT
8
2
NC
VCC_VIDEO
7
3
GND_VIDEO
NC
6
4
CIN
COUT
5
Video Section
Pin#
1
4
5
8
Pin
YIN
CIN
COUT
YOUT
Type
Input
Input
Output
Output
Description
Luma (Luminance) / Composite Input
Chroma (Chrominance) Input
Filtered Chroma (Chrominance) Output
Filtered Luma (Luminance) Output
Power/Ground Pins
Pin#
7
3
6
2
Pin
VCC_VIDEO
GND_VIDEO
NC
NC
Type
Power
Power
NC
NC
Description
+5 VDC for Video
Ground for Video
Reserved (Need to Float)
Reserved (Need to Float)
2
REV. 1.0.1 6/27/02
FMS6414
PRODUCT SPECIFICATION
Functional Description
Introduction
The FMS6414 is a monolithic continuous time video filter
designed for reconstructing the luminance, chrominance,
or composite video signals from D/A source. The chip is
intended for use in applications with AC coupled input and
AC coupled outputs. (See Figure 1) The reconstruction filters
approximate a 4th-order Butterworth characteristic with an
optimization toward low over-shoot and flat group delay.
The video outputs are each capable of driving 2VP-P into an
AC coupled 150
Ω
video load, with up to 35pF of load
capacitance at the output pin. The channel is clamped during
sync to establish the appropriate output voltage swing range.
Thus the input coupling capacitors do not behave according
to the conventional RC time constant. Clamping for all
channels settles to less than 10mv within 5ms of a change in
video input source. In most applications the input coupling
capacitors are 0.1µF. The input typically sinks 1µA during
active video, which nominally tilts a horizontal line by about
2mV at the Video output. During sync, the clamp typically
sources 20µA to restore the DC level. The net result is that
the average input current is zero. Any change in the input
coupling capacitor’s value will inversely alter the amount of
tilt per line. Such a change will also linearly affect the clamp
response time. This product is robust and stable under all
stated load and input conditions. Capacitive bypassing VCC
directly to ground ensures this performance.
Video I/O
The video inputs are driven by either a low impedance
source of 1VP-P or the output of a 75
Ω
terminated line.
The input is required to be AC coupled via a 0.1µF coupling
capacitor which allows for a settling time of 5ms. The video
output is capable of driving an AC coupled 150
Ω
load at
2VP-P, or 1VP-P into a 75
Ω
load. Up to 35pF of load
capacitance (at the output pin) can be driven without stability
or slew issues. The output is AC coupled with a 220µF or
larger AC coupling capacitor.
Typical Applications Diagram
YIN
1
0.1µF
YIN
SYNC STRIP,
REF, AND TIMING
x2
220µF
YOUT
8
75Ω
Video Cable
YOUT
75Ω
gM
2
1V
NC (Reserved)
VCC_VIDEO
7
0.1µF
+5.0V
1µF
FMS6414
3
GND_VIDEO
NC (Reserved)
6
gM
CIN
1V
4
CIN
0.1µF
x2
COUT
220µF
75Ω
5
Video Cable
COUT
75Ω
Figure 1.
REV. 1.0.1 6/27/02
3
PRODUCT SPECIFICATION
FMS6414
Absolute Maximum Ratings
(beyond which the device may be damaged)
Parameter
VCC_VIDEO (Positive DC Supply Voltage)
GND_VIDEO (Negative DC Supply Voltage)
Analog and Digital I/O
Output Current (Continuous)
Junction Temperature
Storage Temperature Range
Lead Temperature (Soldering, 10s)
Thermal Resistance (
Θ
JA
)
-65
GND – 0.3
VCC + 0.3
60
150
+150
260
115
Min
Max
+6.5
Units
V
V
V
mA
°C
°C
°C
°C/W
Note:
Functional operation under any of these conditions is NOT implied. Performance and reliability are guaranteed only if
Operating Conditions are not exceeded.
Operating Conditions
Parameter
Temperature Range
VCC_VIDEO Range
GND_VIDEO
ICC (+5 VDC)
Min
0
4.75
5.0
0
60
Typ
Max
70
5.25
Units
°C
V
V
mA
4
REV. 1.0.1 6/27/02
FMS6414
PRODUCT SPECIFICATION
Electrical Characteristics
1Vp-p signal at room temperature
Video Characteristics
– Unless otherwise noted, typical output loading on video output is 150
Ω
.
Symbol
AVYC
YSYNC
CSYNC
tCLAMP
f1dB
fC
fSB
Vi
ISC
CL
dG
dP
THD
XTALK
Parameter
Low Frequency Gain
(YOUT, COUT)
YOUT Output Level (During Sync)
COUT Output Level (During Sync)
Clamp Response Time
(Y Channel)
–1.0dB Bandwidth (Flatness)
(YOUT, COUT)
–3dB Bandwidth (Flatness)
(YOUT, COUT)
Stopband Rejection
(YOUT, COUT)
Input Signal Dynamic Range
(All Channels)
Output Short Circuit Current
(All Channels)
Output Shunt Capacitance
Differential Gain
Differential Phase
Output Distortion (All Channels)
Crosstalk
fIN = 27MHz to 100MHz worst case
AC Coupled
YOUT, COUT to GND (Note 2)
All Channels
YOUT, COUT
YOUT, COUT
YOUT/ COUT = 1.8VP-P at 3.58/
4.43MHz
From CIN of 0.5VP-P at 3.58MHz to
YOUT
From YIN Input of 0.4VP-P at
3.58MHz, to COUT
PSRR
SNR
tpd
∆
tpd
tSKEW
PSRR (All Channels)
Y, C Channel
Group Delay (Y, C)
Group Delay Deviation from
Flatness (Y, C)
Skew between YOUT and COUT
0.5VP-P (100kHz) at VCC
NTC-7 weighting 4.2 MHz lowpass
100kHz
to 3.58MHz (NTSC)
to 4.43MHz (PAL)
At 1MHz
Condition
VCC_VIDEO=+5.0V ±10%
at 400KHz
Sync Present on YIN
Sync Present on YIN
Settled to Within 10mV, 0.1µF cap
on YIN and CIN
No Peaking Cap (Note 1)
4.0
6.7
-37
1.3
Min
5.75
0.75
1.6
Typ
6.0
1.0
2.0
5
4.5
7.1
-42
1.4
40
35
0.4
0.4
0.8
-55
-58
-40
-75
70
9
7
0
80
Max Units
6.25
1.25
2.4
dB
V
V
ms
MHz
MHz
dB
VP-P
mA
pF
%
°
%
dB
dB
dB
dB
ns
ns
ns
ns
Notes:
1. Peaking capacitor increases output at 4.2MHz nominally by 0.7dB
2. Sustained short circuit protection limited to 10 seconds
REV. 1.0.1 6/27/02
5
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