SM5309A

SEIKO NPC CORPORATION —1

3-channel Video Buffer with Built-in wideband LPF

OVERVIEW

The SM5309A is a 3-channel video buffer with built-in 5th-order lowpass filters. The lowpass filter cutoff fre-

mat, video signal equipment analog input/outputs. For video input systems, the device functions as a next-stage

ADC system anti-aliasing filter. For video output systems, the filter reduces video DAC aliasing and external

noise and can drive up to 300

Ω load resistance. The cutoff frequency and signal input type can be controlled

on the same bus.

FEATURES

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Supply voltages

• Analog: 4.75 to 5.25V

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Lowpass filter with adjustable cutoff frequency

(256 steps)

• Cutoff frequency range: 4MHz to 40MHz

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Filter bypass mode function for display specifica-

tions up to SXGA resolution

• Passband: 80MHz (typ)

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Half fc mode switch function (CH-2, CH-3) suit-

able for component signals

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2-system input multiplexer function

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Video input pins can be independently set to sync-

tip clamp/bias/direct inputs

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Up to 300

Ω load resistance drive capability

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Output gain: 0dB

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Power-down function

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≤ 1mA current consumption when power-down

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• Slave address: 90h, 92h, or 94h

(up to three devices can be used simultaneously,

selected by ADS input)

• Data transfer rate: Fast mode (up to 400kbit/s)

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Operating ambient temperature range: 0 to 70

°C

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Package: 24-pin VSOP

APPLICATIONS

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HDTVs

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LCD TVs

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PDPs

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Projectors

ORDERING INFORMATION

PINOUT

(Top view)

PACKAGE DIMENSIONS

(Unit: mm)

Device

Package

SM5309AV

24-pin VSOP

1

24

IN1A

IN1B

GND

ISET

NC

IN2A

IN2B

VCC

IN3A

IN3B

MUXSEL

SCL

SDA

VDD

GND

OUT3

VCC

OUT2

GND

OUT1

VCC

REF2

REF1

ADS

13

12

0 to 10

7.9 ± 0.2

0.65

0.22

− 0.05

+ 0.1

0.10

0.15

− 0.05

+ 0.1