Datasheet

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FMS6346 • Rev. 1.0.5

October 2009

FMS6346 — Six Channel, 6th-Order SD/HD Video FIlter Driver

FMS6346

Six Channel, 6th-Order SD/HD Video Filter Driver

Features

Three selectable sixth-order 8/32MHz (SD/HD) ﬁ lters

Three ﬁ xed sixth-order 8MHz (SD) ﬁ lters

Transparent input clamping

Single video load drive (2V

, 150, A

= 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-free package - TSSOP-20

Applications

Cable and satellite set-top boxes

DVD players

HDTV

Personal Video Recorders (PVR)

Video On Demand (VOD)

■

Description

The FMS6346 Low Cost Video Filter (LCVF) is intended

to replace passive LC ﬁ lters and drivers with a low-cost

integrated device. Six sixth-order Butterworth ﬁ lters pro-

vide improved image quality compared to typical passive

solutions. The combination of low-power Standard-Deﬁ ni-

tion (SD) and High-Deﬁ nition (HD) ﬁ lters greatly simplify

DVD video output circuitry. Three channels offer ﬁ xed SD

ﬁ lters, while the other three are select able between SD

and HD ﬁ lters.

The FMS6346 offers a ﬁ xed gain of 6dB. The FMS6346

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)

video loads. DC-coupling the outputs removes the need

for output coupling capacitors. The input DC levels are

offset approxi mately +280mV at the output.

Ordering Information

Part Number Gain Option

Operating

Temperature

Eco Status Package Packing Method

FMS6346MTC20X 6dB 0°C to 70°C RoHS TSSOP-20

2500 Units on

Tape and Reel

For Fairchild’s deﬁ nition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.

SD IN1

Selectable

8/32MHz

6th order

6dB

Transparent Clamp

6dB

Transparent Clamp

6dB

Transparent Clamp

6dB

Transparent Clamp

6dB

Transparent Clamp

6dB

Transparent Clamp

8MHz, 6

order

SD/HD

SD IN2

SD IN3

SD OUT1

SD OUT2

SD OUT3

SD/HD IN1

SD/HD IN2

SD/HD IN3

SD/HD OUT

Figure 1. Block Diagram

Summary of content (10 pages)

PAGE 1
FMS6346 Six Channel, 6th-Order SD/HD Video Filter Driver Features Description ■ Three selectable sixth-order 8/32MHz (SD/HD) filters The FMS6346 Low Cost Video Filter (LCVF) is intended to replace passive LC filters and drivers with a low-cost integrated device. Six sixth-order Butterworth filters provide improved image quality compared to typical passive solutions. The combination of low-power Standard-Definition (SD) and High-Definition (HD) filters greatly simplify DVD video output circuitry.
PAGE 2
FMS6346 — Six Channel, 6th-Order SD/HD Video FIlter Driver Pin Configuration SD IN1 1 20 SD OUT1 SD IN2 2 19 SD OUT2 SD IN3 3 18 SD OUT3 FMS6346 20L TSSOP N/C 4 17 GND VCC 5 16 GND FcSEL 6 15 N/C SD/HD IN1 7 14 SD/HD OUT1 SD/HD IN2 8 13 SD/HD OUT2 SD/HD IN3 9 12 SD/HD OUT3 N/C 10 11 N/C Figure 2.
PAGE 3
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only. Symbol Parameter Min. Max. Unit VCC DC Supply Voltage -0.3 6 V VIO Analog and Digital I/O -0.3 VCC + 0.
PAGE 4
TA = 25°C, Vcc = 5V, Rsource = 37.5Ω, inputs AC coupled with 0.1μF, all outputs AC coupled with 220μF into 150Ω loads, referenced to 400kHz; unless otherwise noted. Symbol Parameter Conditions Min. Typ. Max. Units No Load 60 80 mA 1.4 ICC Supply Current VIN Video Input Voltage Range Referenced to GND, if DC-coupled VIL Digital Input Low(1) fcSEL 0 0.8 V VIH Digital Input High(1) fcSEL 2.
PAGE 5
TA = 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. 0.35 0.30 Normalized Gain (dB) Normalized Gain (dB) 5 0 -5 -10 -15 -20 -25 -30 -35 -40 0.25 0.20 0.15 0.10 0.05 0 -0.05 -45 -0.10 -50 400kHz -0.15 5 10 15 20 25 30 400kHz 1 2 Frequency (MHz) 5 Normalized Gain (dB) Normalized Gain (dB) -5 -10 -15 -20 -25 -30 -35 -40 400kHz 10 20 30 40 50 60 70 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.
PAGE 6
Functional Description 0.65V The FMS6346 Low-Cost Video Filter (LCVF) provides 6dB gain from input to output. In addition, the input is slightly offset to optimize the output driver performance. The offset is held to the minimum required value to decrease the standing DC current into the load. Typical voltage levels are shown in Figure 11. YIN Driver YOUT 800kΩ Figure 12. Input Clamp Circuit 1.0 -> 1.02V 0.65 -> 0.67V I/O Configurations 0.3 -> 0.32V 0.0 -> 0.02V VIN 2.28V 1.58V 0.88V 0.
PAGE 7
External video source must be AC coupled 75Ω Power Dissipation The FMS6346 output drive configuration must be considered when calculating overall power dissipation. Care must be taken not to exceed the maximum die junction temperature. The following example can be used to calculate the FMS6346’s power dissipation and internal temperature rise: TJ = TA + Pd • θJA 0.1μF where Pd = PCH1 + PCH2 + PCHx 7.5MΩ LCVF Bias Input 75Ω and PCHx = Vs • ICH - (VO2/RL) where VO = 2Vin + 0.
PAGE 8
Figure 21 Distance from Device Pin to Series Termination Resistor Typical Application Diagram The following circuit may be used for direct DC-coupled drive by DACs with an output voltage range of 0V to 1.4V. AC-coupled or DC-coupled outputs may be used with AC-coupled outputs offering slightly lower power dissipation. DVD Player or STB +5V 0.1 µF 10.
PAGE 9
FMS6346 — Six Channel, 6th-Order SD/HD Video FIlter Driver Physical Dimensions Figure 21. 20-Lead, Thin-Shrink Outline Package (TSSOP) Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or obtain the most recent revision.
PAGE 10
FMS6346 — Six Channel, 6th-Order SD/HD Video FIlter Driver © 2006 Fairchild Semiconductor FMS6346 • Rev. 1.0.5 www.fairchildsemi.