MAX7432EUD(2002) 查看數據表（PDF） - Maxim Integrated

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MAX7432EUD
(Rev.:2002)

Standard Definition Video Reconstruction Filters and Buffers

Maxim Integrated 

Standard Definition Video Reconstruction

Filters and Buffers

MAX7432

13

14

—

—

—

—

PIN

MAX7430

9

10

—

—

—

—

MAX7428

—

2

1

3

5

8

Pin Description (continued)

NAME

OUT1

VCC

INA

INB

SYNCIO

OUT

FUNCTION

Buffer Output 1

+5V Supply Voltage

Video Input A. Use a 0.1µF series input capacitor for proper operation.

Video Input B. Use a 0.1µF series input capacitor for proper operation.

Sync Pulse Input or Output

Buffer Output

0.1µF

D/A

*1MΩ

D/A

ENCODER

0.1µF

*1MΩ

5V

VCC

INA

OUT

MAX7428

REXT

INB

DATA

GND

SYNCIO

Figure 1. MAX7428 Typical Application Circuit

75Ω

**220µF

75Ω

**220µF

C1

300kΩ

Z0 = 75Ω

75Ω

Z0 = 75Ω

75Ω

***

10kΩ

SERIAL I/O

5V

SYNC PULSE

IN OR OUT

C1 = 1nF TO 1µF (SEE TABLE 3)

*NEEDED ONLY IN FILTER BYPASS MODE

**OPTIONAL CAPACITOR

***ONLY ONE PULLUP RESISTOR NEEDED PER BUS

Detailed Description

The MAX7428/MAX7430/MAX7432 filter and buffer the

outputs of DAC encoder chipsets that process digital

video information in applications such as set-top boxes,

hard-disk recorders, DVD players, recorders, and digi-

tal VCRs. These devices also filter and “clean-up” ana-

log video signals. Each channel in the MAX7428/

MAX7430/MAX7432 includes an input mux to select the

input channel, a 6th-order Sallen-Key filter with four

adjustable high-frequency boost levels, an output

buffer with a 6dB gain, a sync detector and clamp, and

an external resistor to set internal bias levels. Output

disable adds additional multiplexing in a wired-OR con-

figuration. Filter bypass, in conjunction with the two

inputs, can be used to provide filtered and unfiltered

video signal processing. Maxim’s Single Pin Bus

(MSPB) interface controls all of the above features. An

external capacitor is used to assign each device a

unique address that allows control of up to 16 devices

on the same bus. Typical application circuits for the

MAX7428/MAX7430/MAX7432 are shown in Figures 1,

2, and 3.

Input Considerations

Use a 0.1µF ceramic capacitor to AC-couple the input

to the MAX7428/MAX7430/MAX7432. This input capaci-

tor stores a DC level to level-shift the input signal to an

optimal point between VCC and GND. The ABSEL bit on

the Control Register sets which channel (IN_A or IN_B)

is selected (Control Register section). The IN_A and

IN_B inputs have a typical input resistance of 50kΩ.

6 _______________________________________________________________________________________

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