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PDF FMS6690 Data sheet ( Hoja de datos )
| Número de pieza | FMS6690 | |
| Descripción | 6th Order SD/PS/HD Video Filter Driver | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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January 2006
FMS6690
Six Channel, 6th Order SD/PS/HD Video Filter Driver
Features
■ Three selectable sixth-order 15/32MHz (PS/HD) filters
■ Three fixed sixth-order 8MHz (SD) filters with muxed input
■ Transparent input clamping
■ Single video load drive (2Vpp, 150Ω, AV = 6dB)
■ AC or DC-coupled inputs
■ AC or DC-coupled outputs
■ DC-coupled outputs eliminate AC-coupling capacitors
■ Low power
■ 5V only
■ Lead (Pb) free packages - TSSOP-20
Applications
■ Cable and satellite set-top boxes
■ DVD players
■ HDTV
■ Personal Video Recorders (PVR)
■ Video On Demand (VOD)
Description
The FMS6690 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), Progressive Scan (PS),
and High Definition (HD) filters greatly simplify DVD video output
circuitry. Three channels offer fixed SD filters and feature an
additional muxed input, while the other three channels are
selectable between PS and HD filters. The FMS6690 offers a
fixed gain of 6dB.
The FMS6690 may be directly driven by a DC-coupled DAC output
or an AC-coupled signal. Internal diode clamps and bias circuitry
may be used if AC-coupled inputs are required (see applications
section for details).
The outputs can drive AC or DC-coupled single (150Ω) 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.
Block Diagram
SD IN1
SD IN2
SD IN3A
SD IN3B
MUXSEL A/B
PS/HD IN1
Transparent Clamp
6dB
Transparent Clamp
6dB
Transparent Clamp
8MHz, 6th order
6dB
Transparent Clamp
6dB
SD OUT1
SD OUT2
SD OUT3
PS/HD OUT1
PS/HD IN2
Transparent Clamp
6dB PS/HD OUT2
PS/HD IN3
Transparent Clamp
FcSEL PS/HD
Selectable
15/32MHz
6th order
6dB
PS/HD OUT3
FMS6690 Rev. 2B
1 www.fairchildsemi.com
1 page  
Typical Performance Characteristics
Tc = 25˚C, Vin = 1Vpp, VCC = 5V, Rsource = 37.5Ω, inputs AC coupled with 0.1µF, all outputs AC coupled with
220µF into 150Ω loads; unless otherwise noted.
Figure 1. SD Gain vs. Frequency
5
0
-5
-10
-15
-20
-25
-30
-35
-40
-45
-50
400kHz
5
10 15 20 25
Frequency (MHz)
30
Figure 3. PS Gain vs. Frequency
-520
-030
-5
-1-040
-1-550
-20
-2-560
-3-070
-35
-80
-40
-4-590
400k0H.1z 10 20 1 30 40 5100
FrFerqeuqeunecnycy(M(MHHz)z)
6030
Figure 5. HD Gain vs. Frequency
5
0
-5
-10
-15
-20
-25
-30
-35
-40
400kHz 10 20 30 40 50 60 70 80
Frequency (MHz)
Figure 2. SD Flatness vs. Frequency
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
-0.05
-0.10
-0.15
400kHz
1
234
Frequency (MHz)
5
6
Figure 4. PS Flatness vs. Frequency
0.-830
0.7
0.-640
Using 0.1µF and 0.01µF
Bypass Capacitors as suggested
0.-550
0.4
0.-360
0.2
0.-170
0
-80
-0.1
-0.-290
400k0H.1z 2
4 61 8 10
FrFerqeuqeunecnycy(M(MHHz)z)
1102
1430
Figure 6. HD Flatness vs. Frequency
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
-0.1
400kHz 5 10 15 20 25 30
Frequency (MHz)
FMS6690 Rev. 2B
5 www.fairchildsemi.com
5 Page 
Ordering Information
Model Part Number
FMS6690 FMS6690MTC20
FMS6690 FMS6690MTC20X
Lead Free Package Container
Yes TSSOP-20 Rail
Yes TSSOP-20 Reel
Temperature range for all parts: 0˚C to 70˚C.
Pack
Qty
94
2500
FMS6690 Rev. 2B
11 www.fairchildsemi.com
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet FMS6690.PDF ] | |
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