www.fairchildsemi.com
FMS6413
Single Channel Video Driver with Integrated Filter
and Clamp
Video Features
• Integrated Video Low Pass reconstruction filter
• Integrated output driver provides a low impedance output
and delivers 2Vp-p (6dB gain) composite video into
150
Ω
.
• 7.1MHz 4
th
order video filter
• 0.4% differential gain with 0.4° differential phase
• Integrated DC Restore / Clamp Circuitry
General Description
The FMS6413 Single Channel Video Filter – Driver Chip
offers comprehensive video filtering for set top box or DVD
applications. This part consists of a 4
th
order video Low
Pass filter for video filtering. This device integrates a video
driver so that it can directly drive to the outside world. There
is also an integrated clamp circuit that allows the part to DC
restore.
The video output is filtered at 7.1MHz and buffered to drive
2Vp-p into an AC coupled 150
Ω
load with up to 35pF of
load capacitance at the output pin. The filter approximates a
4th-order Butterworth characteristic with an optimization
toward low overshoot and flat group delay. Likewise, the
driver is 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
DVD players
Televisions
HDTV
Personal Video Recorders (PVRs)
Video On Demand (VOD)
Cable and Satellite Set top boxes
Block Diagram
SYNC STRIP,
REFERENCE,
AND TIMING
VIDEO_IN
x2
VIDEO_OUT
gM
1V
REV. 1.0.2 6/27/02
FMS6413
Pin Configuration
FMS6413
8-Pin SOIC (S08)
1
VIDEO_IN
VIDEO_OUT
8
2
NC
VCC_VIDEO
7
3
GND_VIDEO
NC
6
4
NC
NC
5
Pin Description
Video Section
Pin#
1
8
Pin
VIDEO_IN
VIDEO_OUT
Type
Input
Output
Description
Video Input
Video Output: This pin is the filtered video output
Power/Ground Pins
Pin#
7
3
4
5
6
2
Pin
VCC_VIDEO
GND_VIDEO
NC
NC
NC
NC
Type
Power
Power
NC
NC
NC
NC
Description
+5 VDC for Video
Ground for Video
Reserved (Need to Float)
Reserved (Need to Float)
Reserved (Need to Float)
Reserved (Need to Float)
2
REV. 1.0.2 6/27/02
FMS6413
Functional Description
Introduction
The FMS6413 is a monolithic continuous time video filter -
driver designed for reconstructing the video signals from a
D/A source. This chip is intended for use in applications
with AC coupled input and AC coupled outputs. (See
Figure 1) The reconstruction filter approximates a 4th-order
Butterworth characteristic with an optimization toward low
over-shoot and flat group delay. The video output is 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 capacitor does
not behave according to the conventional RC time constant.
Clamping for the video channel settles to less than 10mv
within 5ms of a change in video input source. In most
applications the input coupling capacitor is 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 input is 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
VIDEO_IN
1
0.1µF
VIDEO_IN
SYNC STRIP,
REF, AND TIMING
x2
220µF
VIDEO_OUT
8
75Ω
Video Cable
VIDEO_OUT
75Ω
gM
1V
2
NC (Reserved)
VCC_VIDEO
7
0.1µF
+5.0V
FMS6413
1µF
3
GND_VIDEO
NC (Reserved)
6
4
NC (Reserved)
NC (Reserved)
5
Figure 1.
REV. 1.0.2 6/27/02
3
FMS6413
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. 1.0.2 6/27/02
FMS6413
Electrical Characteristics
1Vp-p signal at room temperature
Video Characteristics
- Unless otherwise noted, typical output loading on video output is 150
Ω
.
Symbol
AV
Parameter
Low Frequency Gain (VIDEO_OUT)
VIDEO_OUT Output Level (During
Sync)
tCLAMP
f1dB
fC
fSB
Vi
ISC
CL
dG
dP
THD
PSRR
SNR
tpd
∆
tpd
Group Delay
Group Delay Deviation from
Flatness
Clamp Response Time
–1.0dB Bandwidth (Flatness)
(VIDEO_OUT)
–3dB Bandwidth (Flatness)
(VIDEO_OUT)
Stopband Rejection (VIDEO_OUT)
Input Signal Dynamic Range
Output Short Circuit Current
(All Channels)
Output Shunt Capacitance
Differential Gain
Differential Phase
Output Distortion (All Channels)
PSRR (All Channels)
fIN = 27MHz to 100MHz worst
case
AC Coupled
VIDEO_OUT to GND
VIDEO_OUT
VIDEO_OUT
VIDEO_OUT
VIDEO_OUT = 1.8VP-P at 3.58/
4.43MHz
0.5VP-P (100kHz) at VCC
NTC-7 weighting 4.2 MHz lowpass
100kHz
to 3.58MHz (NTSC)
to 4.43MHz (PAL)
Condition
VCC_VIDEO=+5.0V ±5%
at 400KHz
Sync Present on YIN
Settled to Within 10mV,0.1µF cap
on VIDEO_IN
No Peaking Cap (Note 1)
4.0
6.7
-37
1.3
Min
Typ
6.0
1.0
5
4.5
7.1
-42
1.4
40
35
0.4
0.4
0.8
-40
-75
70
9
7
80
Max Units
dB
V
ms
MHz
MHz
dB
VP-P
mA
pF
%
°
%
dB
dB
ns
ns
ns
Notes:
1. Peaking capacitor increases video output at 4.2MHz nominally by 0.7dB
2. Sustained short circuit protection limited to 10 seconds
REV. 1.0.2 6/27/02
5
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