FMS6246 Six Channel, 6th Order SD/PS Video Filter Driver
March 2006
FMS6246
Six Channel, 6th Order SD/PS Video Filter Driver
Features
■
■
■
■
■
■
■
■
■
■
■
Three selectable sixth-order 8/15MHz (SD/PS) filters
Three fixed sixth-order 8MHz (SD) filters
Transparent input clamping
Single video load drive (2V
pp
, 150
Ω
, A
V
= 6dB)
AC or DC-coupled inputs
AC or DC-coupled outputs
DC-coupled outputs eliminate AC-coupling capacitors
Low power
5V only
Robust (12kV HBM) output ESD protection
Lead (Pb) free packages- TSSOP-20
Description
The FMS6246 Low Cost Video Filter (LCVF) is intended to
replace passive LC filters and drivers with a low-cost integrated
device. Six 6th order Butterworth filters provide improved image
quality compared to typical passive solutions. The combination
of low power Standard Definition (SD) and Progressive Scan
(PS) filters greatly simplify DVD video output circuitry. Three
channels offer fixed SD filters while the other three are select-
able between SD and PS filters.
The FMS6246 offers a fixed gain of 6dB. A metal option is avail-
able that provides a fixed gain of 9dB, offering even more flexi-
bility.
The FMS6246 may be directly driven by a DC-coupled DAC out-
put or an AC-coupled signal. Internal diode clamps and bias cir-
cuitry may be used if AC-coupled inputs are required (see
applications section for details).
The outputs can drive AC or DC-coupled single (150
Ω
) video
loads. DC-coupling the outputs removes the need for output
coupling capacitors. The input DC levels will be offset approxi-
mately +280mV at the output.
Applications
■
Cable and satellite set-top boxes
■
DVD players
■
HDTV
■
Personal Video Recorders (PVR)
■
Video On Demand (VOD)
Block Diagram
SD IN1
Transparent Clamp
6d
B
SD OUT1
SD IN2
Transparent Clamp
6d
B
SD OUT2
SD IN3
Transparent Clamp
6d
B
SD OUT3
8MHz, 6th order
SD/PS IN1
Transparent Clamp
6d
B
SD/PS OUT1
SD/PS IN2
Transparent Clamp
6d
B
SD/PS OUT2
SD/PS IN3
Transparent Clamp
6d
B
SD/PS OUT3
FcSEL PS/HD
Selectable
8/15MHz
6th order
FMS6246 Rev. 1B
1
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FMS6246 Six Channel, 6th Order SD/PS Video Filter Driver
Pin Configuration
SD IN1
SD IN2
SD IN3
N/C
V
CC
F
cSEL
SD/PS IN1
SD/PS IN2
SD/PS IN3
N/C
Pin Assignments
20
19
SD OUT1
SD OUT2
SD OUT3
GND
GND
N/C
SD/PS OUT1
SD/PS OUT2
SD/PS OUT3
1
2
3
4
5
6
7
8
9
10
Pin
#
1
2
3
4
5
Pin
SD IN1
SD IN2
SD IN3
N/C
VCC
FcSEL
SD/PS IN1
SD/PS IN2
SD/PS IN3
N/C
N/C
Type
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Description
SD video input, channel 1
SD video input, channel 2
SD video input, channel 3
No Connect
+5V supply
Selects filter corner frequency for pins 7, 8, and
9. “0” = SD, “1” = PS
Selectable SD or PS video input, channel 1
Selectable SD or PS video input, channel 2
Selectable SD or PS video input, channel 3
No Connect
No Connect
FMS6246
20L TSSOP
18
17
16
15
14
13
12
11
6
7
8
9
N/C
10
11
12
13
14
SD/PS OUT3 Output Filtered SD or PS video output, channel 3
SD/PS OUT2 Output Filtered SD or PS video output, channel 2
SD/PS OUT1 Output Filtered SD or PS video output, channel 1
N/C
GND
GND
SD OUT3
SD OUT2
SD OUT1
Input
Input
Input
No Connect
Must be tied to Ground
Must be tied to Ground
Factory Programming Options
Part
Name
FMS6246
15
16
17
18
19
20
Part
Number
FMS6246MTC20
Gain
Option
6dB
9dB
Output Filtered SD video output, channel 3
Output Filtered SD video output, channel 2
Output Filtered SD video output, channel 1
FMS6246-9 FMS6246MTC209
Absolute Maximum Ratings
Parameter
DC Supply Voltage
Analog and Digital I/O
Output Current, Any One Channel (Do Not Exceed)
Min
-0.3
-0.3
Max
6
V
cc
+ 0.3
50
Unit
V
V
mA
Reliability Information
Parameter
Junction Temperature
Storage Temperature Range
Lead Temperature (Soldering, 10s)
Thermal Resistance (Theta
JA
), JEDEC Standard Multi-Layer Test
Boards, Still Air
74
-65
Min
Typ
Max
150
150
300
Unit
˚C
˚C
˚C
˚C/W
Recommended Operating Conditions
Parameter
Operating Temperature Range
Supply Voltage Range
Min
0
4.75
Typ
5.0
Max
70
5.25
Unit
˚C
V
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2
FMS6246 Rev. 1B
FMS6246 Six Channel, 6th Order SD/PS Video Filter Driver
DC Electrical Characteristics
T
c
= 25˚C, V
cc
= 5V, R
source
= 37.5
Ω
, inputs AC coupled with 0.1
µ
F, all outputs AC coupled with 220
µ
F into
150
Ω
loads, referenced to 400kHz; unless otherwise noted.
Symbol
I
CC
V
in
V
il
V
ih
Parameter
Supply Current
1
Video Input Voltage Range
Digital Input Low
1
Digital Input
High
1
no load
Conditions
Referenced to GND, if DC-coupled
F
cSEL
F
cSEL
Min
Typ
60
1.4
Max
80
Units
mA
Vpp
0
2.4
0.8
V
V
V
cc
Standard Definition Electrical Characteristics
T
c
= 25˚C, V
in
= 1V
pp
, V
cc
= 5V, R
source
= 37.5
Ω
, all inputs AC coupled with 0.1
µ
F, all outputs AC coupled
with 220
µ
F into 150
Ω
loads, referenced to 400kHz; unless otherwise noted.
Symbol
AV
SD
f
1dBSD
f
cSD
f
SBSD
DG
DP
THD
X
TALKSD
SNR
t
pdSD
Parameter
Channel Gain
1
-1dB Bandwidth
1
-3dB Bandwidth
1
Conditions
All SD Channels
All SD Channels
All SD Channels
Min
5.6
5.2
6.5
43
Typ
6.0
7.15
8.0
50
0.7
1.0
0.35
-54
72
90
Max
6.4
Units
dB
MHz
MHz
dB
%
˚
%
dB
dB
ns
Attenuation(stopband reject)
1
All SD Channels at f = 27MHz
Differential Gain
Differential Phase
Output Distortion
Crosstalk (ch-to-ch)
Signal-to-Noise Ratio
2
Propagation Delay
All SD Channels
All SD Channels
V
OUT
= 1.4V
pp
, 3.58MHz
at 1MHz
NTC-7 weighting, 100kHz to 4.2MHz
Delay from input to output, 4.5MHz
Progressive Scan Electrical Characteristics
T
c
= 25˚C, V
in
= 1V
pp
, V
cc
= 5V, R
source
= 37.5
Ω
, F
cSEL
= 0, all inputs AC coupled with 0.1
µ
F, all outputs AC
coupled with 220
µ
F into 150
Ω
loads, referenced to 400kHz; unless otherwise noted.
Symbol
AV
PS
f
1dBSPS
f
cPS
f
SBPS
THD
X
TALKPS
SNR
t
pdPS
Parameter
Channel Gain
1
-1dB Bandwidth
1
-3dB Bandwidth
1
Conditions
All PS Channels
All PS Channels
All PS Channels
Min
5.6
12
13
37
Typ
6.0
14
16
45
0.35
-53
66
47
Max
6.4
Units
dB
MHz
MHz
dB
%
dB
dB
ns
Attenuation(stopband reject)
1
All PS Channels at f = 54MHz
Output Distortion (All PS
channels)
Crosstalk (ch-to-ch)
Signal-to-Noise Ratio
2
Propagation Delay
V
OUT
= 1.4V
pp
, 7MHz
at 1MHz
unweighted; 100kHz to 15MHz
Delay from input to output
Notes:
1. 100% tested at 25˚C
2. SNR = 20 * log (714mV/rms noise)
FMS6246 Rev. 1B
3
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FMS6246 Six Channel, 6th Order SD/PS Video Filter Driver
Typical Performance Characteristics
T
c
= 25˚C, V
in
= 1V
pp
, V
CC
= 5V, R
source
= 37.5
Ω
, inputs AC coupled with 0.1
µ
F, all outputs AC coupled with
220
µ
F into 150
Ω
loads; unless otherwise noted.
Figure 1. SD Gain vs. Frequency
5
0
Figure 2. SD Flatness vs. Frequency
0.35
0.30
Normalized Gain (dB)
-5
-10
-15
-20
-25
-30
-35
-40
-45
-50
400kHz
5
10
15
20
25
30
Normalized Gain (dB)
0.25
0.20
0.15
0.10
0.05
0
-0.05
-0.10
-0.15
400kHz
1
2
3
4
5
6
Frequency (MHz)
Frequency (MHz)
Figure 3. PS Gain vs. Frequency
5
0
Figure 4. PS Flatness vs. Frequency
0.8
0.7
Normalized Gain (dB)
Normalized Gain (dB)
10
20
30
40
50
60
-5
-10
-15
-20
-25
-30
-35
-40
-45
400kHz
0.6
0.5
0.4
0.3
0.2
0.1
0
-0.1
-0.2
400kHz
2
4
6
8
10
12
14
Frequency (MHz)
Frequency (MHz)
Figure 5. SD Group Delay vs. Frequency
70
Figure 6. PS Group Delay vs. Frequency
25
Normalized Group Delay (ns)
60
50
40
30
20
10
0
400kHz 1
Normalized Group Delay (ns)
2
3
4
5
6
7
8
9
10
20
15
10
5
0
400kHz 5
10
15
20
25
30
35
40
45
Frequency (MHz)
Frequency (MHz)
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4
FMS6246 Rev. 1B
FMS6246 Six Channel, 6th Order SD/PS Video Filter Driver
Typical Performance Characteristics
T
c
= 25˚C, V
in
= 1V
pp
, V
CC
= 5V, R
source
= 37.5Ω, inputs AC coupled with 0.1µF, all outputs AC coupled with
220µF into 150Ω loads; unless otherwise noted.
Figure 7. SD Differential Gain
1.0
NTSC
Figure 8. SD Differential Phase
1.0
NTSC
0.5
Differential Phase (Deg)
Differential Gain (%)
0
0
Min = 0.05
Max = 0.59
ppmax = 0.63
-1.0
Min = 0.00
Max = 1.00
ppmax = 1.00
-1.0
1st
2nd
3rd
4th
5th
6th
-2.0
1st
2nd
3rd
4th
5th
6th
FMS6246 Rev. 1B
5
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