Fairchild FMS6410CS Dual channel video drivers with integrated filters and composite video summer Datasheet

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FMS6410
Dual Channel Video Drivers with Integrated Filters
and Composite Video Summer
Video Features
General Description
• Dual integrated video low pass reconstruction filters on
outputs
• Composite Video Summer
• Integrated output drivers provide low impedance outputs
and deliver 2VP-P (6dB gain) video into 150Ω.
• 7.1MHz 4th order video filters
• 7.1MHz Y and C filters, with CV out
• 42dB stopband attenuation at 27MHz on Y, C, and CV
• Better than 1dB flatness to 4.5 MHz on Y, C, and CV
• No external frequency select components or clocks
• 9ns group delay flatness on Y, C, and CV output
• AC coupled inputs and outputs
• 0.4% differential gain with 0.4° differential phase
• Integrated DC Restore / Clamp circuitry with low tilt
The FMS6410 Dual Channel Video Filter – Driver Chip with
CV Summer offers comprehensive video filtering for set top
box or DVD applications. This part consists of two 4th order
Butterworth 7.1MHz low pass filters for video signals. The
filters are optimized for low overshoot and flat group delay.
The device also contains a summing circuit to generate
filtered composite video. Integrated video drivers are
included to facilitate a direct drive to the outside world.
In a typical application, the Y and C input signals from
DACs are AC coupled into the filter. Both channels have DC
restore circuitry to clamp the DC input levels during video
sync. The Y and C channels use a separate feedback clamp.
The clamp pulse is derived from the Y channel.
The outputs are AC coupled. The Y, C and, CV outputs are
buffered to drive 2VP-P into a 150Ω load (1VP-P into a
doubly terminated 75Ω coax load) with up to 35pF of load
capacitance at the output pin. The Y, C, and CV channels
have a gain of approximately 2 (6dB) with 1VP-P input
levels. There is an option for the video output to be DC
coupled which limits the drive output to one output on each
channel.
Applications
•
•
•
•
•
•
•
CCTV
Cable and Satellite Set top boxes
DVD players
Televisions
Personal Video Recorders (PVRs)
Video On Demand (VOD)
Distribution Amplifiers
Functional Block Diagram
1
SYNC STRIP, REF,
AND TIMING
YIN
YOUT
6dB
8
gM
2
1V
NC (Reserved)
VCC_VIDEO
7
FMS6410
3
CVOUT 6
GND_VIDEO
gM
1V
4
CIN
6dB
COUT 5
REV. 0.0.2 9/3/02
FMS6410
PRODUCT SPECIFICATION
Pin Configuration
FMS6410
8-Pin SOIC (SO8)
YIN
1
8
YOUT
NC
2
7
VCC_VIDEO
GND_VIDEO
3
6
CVOUT
CIN
4
5
COUT
Video Section
Pin#
Pin
Type
Description
1
YIN
Input
Luma (Luminance) / Composite Input
4
CIN
Input
Chroma (Chrominance) Input
5
COUT
Output
Filtered Chroma (Chrominance) Output
6
CVOUT
Output
Summed Composite Video Output
8
YOUT
Output
Filtered Luma (Luminance) Output
Power/Ground Pins
2
7
VCC_VIDEO
Power
+5 VDC for Video
3
GND_VIDEO
Power
Ground for Video
2
NC
NC
Reserved (Need to Float)
REV. 0.0.2 9/3/02
FMS6410
Functional Description
Introduction
The FMS6410 is a dual monolithic continuous time video
filter designed for reconstructing the luminance and chrominance signals from an S-Video D/A source. The Composite
video output is generated by summing the filtered Y and C
outputs. The chip is intended for use in applications with AC
coupled inputs and AC coupled outputs (See Figure 1). The
reconstruction filters approximate a 4th-order Butterworth
characteristic with an optimization toward low overshoot and
flat group delay. Y, C, and CV outputs are capable of driving
2VP-P into AC coupled 150Ω video loads with up to 35pF of
load capacitance at the output pin. All channels are 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 sources. In most applications the input
coupling capacitors are 0.1µF. The Y and C inputs typically
sink 1µA during active video, which nominally tilts a
horizontal line by about 2mV at the Y 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 times. This product is
robust and stable under all stated load and input conditions.
Capacitive bypassing of VCC directly to ground ensures this
performance.
Luminance (Y) I/O
The luma input is driven by either a low impedance source of
1VP-P or the output of a 75Ω 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 luma output is
capable of driving an AC coupled 150Ω load at 2VP-P, or
1VP-P into a doubly terminated 75Ω 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.
REV. 0.0.2 9/3/02
Chrominance (C) I/O
The chroma input is driven by a low impedance source of
0.7VP-P or the output of a 75Ω terminated line. The input is
required to be AC coupled via a 0.1µF coupling capacitor
which allows for a clamp setting time of 5ms. The chroma
output is capable of driving an AC coupled 150Ω load at
2VP-P, or 1VP-P into a doubly terminated 75Ω load. Up to
35pF of load capacitance can be driven without stability or
slew issues. A 0.1µF AC coupling capacitor is recommended
at the output. Since chrominance signals do not contain
low frequency components, the smaller 0.1µF cap is
recommended instead of the 220µF cap to reduce circuit
cost.
Composite Video (CV) Output
The composite video output is capable of driving 2 loads to
2VP-P. It is intended to drive a TV and a VCR. Either the TV
input or the VCR input can be shorted to ground and the
other output will still meet specifications. Up to 35pF of load
capacitance (at the output pin) can be driven without stability
or slew issues.
DC Coupled Output Applications
The 220µF capacitor coupled with the 150Ω termination
forms a high pass filter that blocks the DC while passing the
video frequencies and avoiding tilt. Lower values such as
10µF would create a problem. By AC coupling, the average
DC level is zero. Thus, the output voltages of all channels
will be centered around zero. Alternately, DC coupling the
output of the FMS6410 is allowable. There are several
tradeoffs: The average DC level on the outputs will be 2V;
Each output will dissipate an additional 40mW nominally;
The application will need to accommodate a 1V DC offset
sync tip; And it is recommended to limit each output to one
150Ω load.
3
FMS6410
PRODUCT SPECIFICATION
Typical Applications
SYNC STRIP, REF,
AND TIMING
YIN
1 YIN
YOUT
6dB
75Ω
220µF
8
YOUT
Video Cable
0.1µF
75Ω
gM
2
1V
NC (Reserved)
VCC_VIDEO
+5.0V
7
0.1µF
1µF
FMS6410
3
CVOUT
GND_VIDEO
220µF
6
75Ω
CVOUT
Video Cable
75Ω
gM
1V
0.1µF
CIN
COUT
4 CIN
6dB
5
75Ω
COUT
Video Cable
0.1µF
75Ω
Figure 1. Typical Configuration
220µF
75Ω
YOUT
Video Cable
75Ω
SYNC STRIP, REF,
AND TIMING
YIN
1 YIN
YOUT
6dB
220µF
8
75Ω
YOUT
Video Cable
0.1µF
75Ω
gM
2
1V
NC (Reserved)
VCC_VIDEO
+5.0V
7
0.1µF
1µF
FMS6410
3
CVOUT
GND_VIDEO
6
220µF
75Ω
YOUT
Video Cable
75Ω
gM
4 CIN
1V
COUT
6dB
5
220µF
75Ω
YOUT
Video Cable
75Ω
Figure 2. One Input to Four Output Distribution Amplifier Configuration
4
REV. 0.0.2 9/3/02
PRODUCT SPECIFICATION
FMS6410
1
20
0
0
AMPLITUDE (dB)
AMPLITUDE (dB)
Typical Performance Graphs
-1
-2
-3
-20
-40
-60
-4
0.01
0.1
1
10
FREQUENCY (MHz)
-80
0.01
0.1
1
10
100
FREQUENCY (MHz)
Figure 3. Passband Flatness for Y, C, and CV
outputs (Normalized). Passband is ripple-free.
Figure 4. Passband/Stopband Rejection Ratios
for Y, C, and CV outputs. (Normalized)
90
DELAY (ns)
70
50
30
10
1
2
3
4
5
6
7
8
9
10 11
FREQUENCY (MHz)
Figure 5. tPD Propagation Delay for Y, C,
and CV Outputs
REV. 0.0.2 9/3/02
Figure 6. DC Restore Performance of Luma Output.
Luma ramp test pattern is shown to have minimal tilt
during vertical sync.
5
FMS6410
PRODUCT SPECIFICATION
Absolute Maximum Ratings (beyond which the device may be damaged)
Min
Max
Units
-0.3
+7.0
V
GND-0.3
VCC+0.3
V
CV Channel
60
mA
Y and C Channels
30
mA
150
°C
Parameter
DC Supply Voltage
Analog I/O
Output Current (Continuous)
Junction Temperature
+150
°C
Lead Temperature (Soldering, 10s)
260
°C
Thermal Resistance (ΘJA)
115
°C/W
Storage Temperature Range
-65
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
Min
Temperature Range
0
VCC_VIDEO Range
4.75
Typ
ICC (+5 VDC), AC Coupled Outputs
Max
Units
70
°C
5.0
5.25
V
60
85
mA
Electrical Characteristics 1Vp-p input signal at room temperature
Video Characteristics - Unless otherwise noted, typical output loading on video output is 150Ω.
Symbol
Parameter
Condition
VCC_VIDEO=+5.0V+/-5%
Min
Typ
Max Units
5.75
6.0
6.25
dB
AVYC
Low Frequency Gain (YOUT, COUT)
at 400kHz
AVCV
Low Frequency Gain (CVOUT)
at 400kHz
5.55
5.9
6.25
dB
YSYNC
YOUT Output Level (During Sync)
Sync Present on YIN
0.75
1.0
1.25
V
CSYNC
COUT Output Level (During Sync)
Sync Present on YIN
1.6
2.0
2.4
V
CVSYNC
CVOUT Output Level (During Sync)
Sync Present on YIN
0.75
1.0
1.25
V
tCLAMP
Clamp Response Time (Y Channel)
Settled to within 10mV, 0.1µF cap
on YIN and CIN
5
9
ms
f1dB
–1.0dB Bandwidth (Flatness)
(YOUT, COUT, and CVOUT)
No Peaking Cap (Note 1)
fC
–3dB Bandwidth (Flatness)
(YOUT, COUT, and CVOUT)
fSB
Stopband Rejection
(YOUT, COUT, and CVOUT)
Vi
4.0
4.5
MHz
6.7
7.1
MHz
fIN = 27MHz
-37
-42
dB
Input Signal Dynamic Range
AC Coupled (All Channels)
1.3
1.4
VP-P
ISC
Output Short Circuit Current (Note 2)
YOUT, COUT, CVOUT to GND
CL
Output Shunt Capacitance
All Channels
35
dG
Differential Gain (Note 3)
YOUT, COUT, and CVOUT
0.4
1
%
dP
Differential Phase (Note 3)
YOUT, COUT, and CVOUT
0.4
1
°
THD
Output Distortion (All Channels)(Note 3) YOUT / COUT = 1.8VP-P at
3.58 / 4.43MHz
0.1
0.5
%
6
40
80
mA
pF
REV. 0.0.2 9/3/02
PRODUCT SPECIFICATION
FMS6410
Electrical Characteristics 1Vp-p input signal at room temperature (continued)
Video Characteristics - Unless otherwise noted, typical output loading on video output is 150Ω.
Symbol
XTALK
Parameter
Crosstalk (Note 3)
Condition
VCC_VIDEO=+5.0V+/-5%
Min
Typ
Max Units
From CIN of 0.5VP-P at 3.58MHz
to YOUT
-45
-55
dB
From YIN Input of 0.4VP-P at
3.58MHz, to COUT
-50
-58
dB
PSRR
PSRR (All Channels) (Note 3)
0.5VP-P (100kHz) at VCC
-30
-40
dB
SNR
Y, C Channel (Note 3)
NTC-7 weighting 4.2 MHz
lowpass
-65
-75
dB
CV Channel (Note 3)
NTC-7 weighting 4.2 MHz
lowpass
-60
-70
dB
tPD
Propagation Delay (Y, C, CV) (Note 3)
100kHz
30
70
∆tpd
Group Delay Deviation from Flatness
(Y, C, and CV) (Note 3)
to 3.58MHz (NTSC)
9
ns
to 4.43MHz (PAL)
7
ns
110
0
ns
tSKEW
Skew between YOUT and COUT (Note 3) at 1MHz
TCLDCV
Chroma-Luma Delay CVOUT
f = 3.58MHz (referenced to YIN at
400kHz)
-35
0
35
ns
ns
TCLGCV
Chroma-Luma Gain CVOUT
f = 3.58MHz (referenced to YIN at
400kHz)
92
95
104
%
Notes:
1. Peaking capacitor of 330pF increases output at 4.2MHz nominally by 0.7dB
2. Sustained short circuit protection limited to 10 seconds
3. Guaranteed by Characterization
REV. 0.0.2 9/3/02
7
FMS6410
PRODUCT SPECIFICATION
Mechanical Dimensions Inches (millimeters)
Package: S08
8-Pin SOIC
0.189 - 0.199
(4.80 - 5.06)
8
0.148 - 0.158 0.228 - 0.244
(3.76 - 4.01) (5.79 - 6.20)
PIN 1 ID
1
0.017 - 0.027
(0.43 - 0.69)
(4 PLACES)
0.050 BSC
(1.27 BSC)
0.059 - 0.069
(1.49 - 1.75)
0° - 8°
0.055 - 0.061
(1.40 - 1.55)
0.012 - 0.020
(0.30 - 0.51)
0.004 - 0.010
(0.10 - 0.26)
0.015 - 0.035
(0.38 - 0.89)
0.006 - 0.010
(0.15 - 0.26)
SEATING PLANE
8
REV. 0.0.2 9/3/02
FMS6410
PRODUCT SPECIFICATION
Ordering Information
Part Number
Temperature Range
Package
FMS6410CS
0° to 70°
8 Pin SOIC (S08)
FMS6410CSX
0° to 70°
Tape and Reel
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FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO
ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME
ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN;
NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.
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FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES
OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR
CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body,
or (b) support or sustain life, and (c) whose failure to
perform when properly used in accordance with
instructions for use provided in the labeling, can be
reasonably expected to result in a significant injury of the
user.
2. A critical component in any component of a life support
device or system whose failure to perform can be
reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
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