ML6423 データシートの表示（PDF） - Micro Linear Corporation

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ML6423

Dual S-Video Lowpass Filter with Phase and Sinx/x Equalization

Micro Linear Corporation 

June 1999

PRELIMINARY

ML6423*

Dual S-Video Lowpass Filter with

Phase and Sinx/x Equalization

GENERAL DESCRIPTION

The ML6423 monolithic BiCMOS 6th-order filter provides

a two-channel fixed frequency lowpass filtering for video

applications. This dual phase equalized filter with sinx/x

correction is designed for reconstruction filtering at the

output of a Video DAC. A composite sum output

eliminates the need for a third DAC.

Cutoff frequencies are either 5.5MHz or 9.6MHz. Each

channel incorporates a 6th-order lowpass filter, a first

order allpass filter, a gain boost circuit, and a 75W coax

cable driver. A control pin (RANGE) is provided to allow

the inputs to swing from 0 to 1V, or 0.5 to 1.5V, by

providing a 0.5V offset to the input.

The 2X gain filters are powered from a single 5V supply,

and can drive 1VP-P into 75W (0.5V to 1.5V), or 2VP-P into

150W (0.5V to 2.5V) with the internal coax drivers.

BLOCK DIAGRAM

10

VCCB

7

VCCC

FEATURES

s 5.5 or 9.6MHz bandwidth with 6dB gain

s >40dB stopband rejection

s No external components or clocks

s ±10% frequency accuracy over maximum supply

and temperature variation

s <2% differential gain, <2° differential phase

s <20ns group delay variation

s 5V ±10% operation

s Composite (sum) output

s High sink current for AC coupled loads, ML6423-5

* This Product Is End Of Life As Of August 1, 2000

4

13

VCC

VCCA

VINA (Y)

16

BUF

2kΩ

IBIAS

2kΩ

15 RANGE

LOWPASS

FILTER A

ALLPASS

SINX/X

2X

FILTER EQUALIZER BUF

∑

2X

BUF

VOUTA (Y)

12

3.43kΩ

VOUTB (CV)

8

3.43kΩ

VINC (C)

1

BUF

2kΩ

IBIAS

2kΩ

LOWPASS

FILTER C

ALLPASS

SINX/X

2X

FILTER EQUALIZER BUF

VOUTC (C)

6

3.43kΩ

GND

2

GNDA

14

Filter A

Filter C

ML6423-1

5.50MHz

5.50MHz

GNDC

3

ML6423-2

9.6MHz

9.6MHz

GNDB

9

ML6423-5

9.6MHz

9.6MHz

1

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