Fairchild FMS6410BCS Dual channel video drivers with integrated filters and composite video summer Datasheet

FMS6410B
Dual Channel Video Drivers with Integrated Filters and
Composite Video Summer
Features
Description
■ 7.1MHz 5th order Y,C filters with composite summer
The FMS6410B is a dual Y/C 5th order Butterworth lowpass
video filter optimized for minimum overshoot and flat group
delay. The device also contains a summing circuit to generate
filtered composite video. In a typical application, the Y and C
input signals from DACs are AC coupled into the filters. Both
channels have DC restore circuitry to clamp the DC input levels
during video sync. The Y and C channels use separate feedback clamps. The clamp pulse is derived from the Y channel.
■ 50dB stopband attenuation at 27MHz on Y, C and CV outputs
■ Better than 0.1dB flatness to 4.5MHz on Y,C and CV outputs
■ No external frequency selection components or clocks
■ < 5ns group delay on Y, C and CV outputs
■ AC-Coupled Inputs
■ AC or DC-Coupled Outputs
■ Capable of PAL frequency selection components or clocks
All outputs are capable of driving 2Vpp, AC or DC coupled, into
either a single or dual video load. A single video load consists of
a series 75Ω impedance matching resistor connected to a terminated 75Ω line. This presents a total of 150Ω of loading to the
part. A dual load would be two of these in parallel which would
present a total of 75Ω to the part. The gain of the Y, C and CV
signals is 6dB with 1Vpp input levels. All video channels are
clamped during sync to establish the appropriate output voltage
reference levels.
■ 0.3% differential gain with 0.2° differential phase on Y,C and
CV channels
■ Integrated DC restore circuitry with low tilt
■ Lead (Pb) Free SOIC-8 Package
Applications
■ Cable and Satellite set top boxes
■ DVD players
■ Personal Video Recorders (PVR)
■ Video On Demand (VOD)
Block Diagrams
VCC
7
Sync Strip
Reference and
Timing
YIN
6dB
1
8
YOUT
gM
250mV
+
S
6 CVOUT
+
gM
250mV
CIN
4
6dB
5
COUT
3
GND
©2004 Fairchild Semiconductor Corporation
FMS6410B Rev. 1A
1
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FMS6410B Dual Channel Video Drivers with Integrated Filters and Composite Video Summer
September 2005
Pin Assignments
Pin#
Pin
Type
Description
1
YIN
Input
Luminance (Luma) Input: In a typical system,
this pin is connected to the Luma or composite video output pin from the external video
encoder.
2
NC
-
3
GND
Input
Must be tied to Ground
4
CIN
Input
Chrominance (Chroma) Input: In a typical
system, this pin is connected to the Chroma
output pin from the external video encoder.
5
COUT
Output
Filtered Chrominance Video Output from the
CIN channel.
6
CVOUT
Output
Composite Video Output: This pin is the sum
of YOUT and COUT .
FAIRCHILD
YIN
1
8
YOUT
7
VCC
FMS6410B
NC
2
8L SOIC
GND
3
6
CVOUT
CIN
4
5
COUT
7
VCC
Input
8
YOUT
Output
No Connect.
+5V supply
Filtered Luminance Output from the YIN
channel.
Typical Application Diagram
FMS6410B may also
be DC-Coupled
0.1µF
YIN
1
YIN
YOUT
75Ω
8
220µF
YOUT
75Ω
FMS6410B
CVOUT
75Ω
6
220µF
To TV
75Ω
0.1µF
CIN
4
75Ω
220µF
CIN
COUT 5
5V
0.1µF
VCC
GND
7
3
75Ω
75Ω
CVOUT
to VCR
220µF
COUT
10µF
75Ω
Figure 1. AC or DC-Coupled Application Diagram
2
FMS6410B Rev. 1A
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FMS6410B Dual Channel Video Drivers with Integrated Filters and Composite Video Summer
Pin Configuration
Parameter
Min.
Max.
Unit
DC Supply Voltage
-0.3
6
V
Analog and Digital I/O
-0.3
Vcc + 0.3
V
40
mA
Output Current Any One Channel, Do Not Exceed
Note:
Functional operation under any of these conditions in NOT implied. Performance and reliability are guaranteed only if operating conditions are not exceeded.
Reliability Information
Parameter
Min.
Typ.
Max.
Unit
150
°C
150
°C
300
°C
Junction Temperature
Storage Temperature Range
-65
Lead Temperature (Soldering, 10s)
Thermal Resistance (ThetaJA), JEDEC Standard Multi-Layer Test Boards, Still Air
115
°C/W
Recommended Operating Conditions
Parameter
Min.
Operating Temperature Range
Max.
Unit
70
°C
5.0
5.25
V
0
Supply Voltage Range
4.75
3
FMS6410B Rev. 1A
Typ.
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FMS6410B Dual Channel Video Drivers with Integrated Filters and Composite Video Summer
Absolute Maximum Ratings
Tc = 25°C, Vcc = 5V, Vin = 1Vpp, all inputs AC coupled with 0.1uF, all outputs AC coupled with 220uF into
150Ω loads, referenced to 400kHz; unless otherwise noted.
Symbol
Parameter
Conditions
Current1
ICC
Supply
Vi
Input Voltage Max
PSRR
Power Supply Rejection Ratio
Min.
No load
All channels, DC
Typ.
Max
50
60
Units
mA
1.4
Vpp
60
dB
AC Electrical Characteristics
Tc = 25°C, Vcc = 5V, Vin = 1Vpp, all inputs AC coupled with 0.1uF, all outputs AC coupled with 220uF into
150Ω loads, referenced to 400kHz; unless otherwise noted.
Symbol
Parameter
Conditions
1
All Channels
Min.
Max
Units
AV
Channel Gain
6.0
6.25
dB
Csync
COUT Output Level (during sync)1
Sync present on YIN (after 6dB gain)
1.0
1.3
V
Ysync
YOUT Output Level (during
sync)1
Sync present on YIN (after 6dB gain)
0.35
0.5
V
CVsync
CVOUT Output Level (during sync)1
Sync present on YIN (after 6dB gain)
0.35
0.5
V
TCLAMP
Clamp Response Time (Y channel) Settled to within 10mV
10
ms
fFLAT
Gain Flatness to 4.5MHz
0
dB
Bandwidth1
5.75
Typ.
All Channels
fC
-3dB
fSB
Stopband Attenuation1
All Channels
6.7
7.1
MHz
All Channels at 27MHz
42
50
dB
dG
Differential Gain
All Channels
0.3
%
dP
Differential Phase
All Channels
0.2
deg
THD
Output Distortion
VOUT = 1.4Vpp, 3.58MHz
0.3
%
XTALK
Crosstalk
at 3.58MHz
-50
dB
SNR
Signal-to-Noise Ratio
All Channels
NTC-7 weighting, 4.2MHz LP,
100kHz HP
82
dB
tpd
Propagation Delay
All Channels
115
ns
GD
Group Delay Deviation
All Channels at 3.58MHz
4
ns
tSKEW
Skew Between YOUT and COUT
at 1MHz
tCLGCV
Chroma-Luma Gain CVOUT1
f = 3.58MHz (ref to YIN at 400kHz)
0
tCLDCV
Chroma-Luma Delay CVOUT
f = 3.58MHz (ref to YIN at 400kHz)
96
100
4
ns
104
%
ns
Notes:
1. 100% tested at 25°C
4
FMS6410B Rev. 1A
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FMS6410B Dual Channel Video Drivers with Integrated Filters and Composite Video Summer
DC Electrical Characteristics
Layout Considerations
Functional Description
General layout and supply bypassing play major roles in high
frequency performance and thermal characteristics. Fairchild
offers a demonstration board, FMS6410BDEMO, to use as a
guide for layout and to aid in device testing and characterization.
The FMS6410BDEMO is a 4-layer board with a full power and
ground plane. For optimum results, follow the steps below as a
basis for high frequency layout:
This product is a two channel monolithic continuous time video
filter designed for reconstructing the luminance and chrominance signals from an S-Video D/A source. Composite video
output is generated by summing the Y and C outputs. The chip
is designed to have AC coupled inputs and will work equally well
with either AC or DC coupled outputs.
• Include 10µF and 0.1µF ceramic bypass capacitors
The reconstruction filters provide a 5th order Butterworth
response with group delay equalization. This provides a maximally flat response in terms of delay and amplitude. Each of the
three outputs is capable of driving 2Vpp into a 75Ω load.
• Place the 10µF capacitor within 0.75 inches of the power pin
• Place the 0.1µF capacitor within 0.1 inches of the power pin
• If using DC-coupled outputs, use a large ground plane to help
dissipate heat
All channels are clamped during the sync interval to set the
appropriate minimum output dc level. With this operation the
effective input time constant is greatly reduced, which allows for
the use of small low cost coupling capacitors. The net effect is
that the input will settle to 10mV in 10ms for any DC shifts
present in the input video signal.
• Minimize all trace lengths to reduce series inductances
In most applications the input coupling capacitors are 0.1µF.
The Y and C inputs typically sink 1µA of current during active
video, which normally tilts a horizontal line by 2mV at the Y output. During sync, the clamp restores this leakage current by
sourcing an average of 20µA over the clamp interval. Any
change in the coupling capacitor values will affect the amount of
tilt per line. Any reduction in tilt will come with an increase in settling time.
Luminance (Y) I/O
The typical luma input is driven by either a low impedance
source of 1Vpp or the output of a 75Ω terminated line driven by
the output of a current DAC. In either case, the input must be
capacitively coupled to allow the sync-detect and DC restore circuitry to operate properly.
All outputs are capable of driving 2Vpp, AC or DC coupled, into
either a single or dual video load. A single video load consists of
a series 75Ω impedance matching resistor connected to a terminated 75Ω line, this presents a total of 150Ω of loading to the
part. A dual load would be two of these in parallel which would
present a total of 75Ω to the part. The gain of the Y, C and CV
signals is 6dB with 1Vpp input levels.
Chrominance (C) I/O
The chrominance input can be driven in the same manner as
the luminance input but is typically only a 0.7Vpp signal.
Since the chrominance signal doesn't contain any DC content,
the output signal can be AC coupled using as small as a 0.1µF
capacitor if DC coupling is not desired.
Composite Video (CV) Output
The composite video output driver is same as the other outputs.
5
FMS6410B Rev. 1A
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FMS6410B Dual Channel Video Drivers with Integrated Filters and Composite Video Summer
Applications Information
FMS6410B Rev. 1A
FMS6410B Dual Channel Video Drivers with Integrated Filters and Composite Video Summer
Mechanical Dimensions
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FMS6410B Dual Channel Video Drivers with Integrated Filters and Composite Video Summer
Ordering Information
Model
Part Number
Lead Free
Package
Container
Pack
Qty
FMS6410B
FMS6410BCS
Yes
SOIC-8
Rail
95
FMS6410B
FMS6410BCSX
Yes
SOIC-8
Reel
2500
Temperature range for all parts: 0°C to 70°C.
7
FMS6410B Rev. 1A
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Rev. I7
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FMS6410B Dual Channel Video Drivers with Integrated Filters and Composite Video Summer
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