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參數(shù)資料

型號(hào)：	MAX4550
廠商：	Maxim Integrated Products, Inc.
元件分類：	數(shù)字信號(hào)處理
英文描述：	Fixed-Point Digital Signal Processors 240-BGA MICROSTAR
中文描述：	串行控制、雙路4x2、無(wú)喀嗒聲的音頻/視頻模擬交叉點(diǎn)開(kāi)關(guān)
文件頁(yè)數(shù)：	10/16頁(yè)
文件大?。?/td>	170K
代理商：	MAX4550

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S erially Controlled, Dual 4x2, Clic kless

Audio/Video Analog Crosspoint S witc hes

______________________________________________________________________________________

Detailed Desc ription

The MAX4550/MAX4570 are serial-interface, program-

mable, dual 4x2 audio/video crosspoint switches. Each

device contains two independent 4x2 crosspoint

switches, controlled through the on-chip serial inter-

face. The MAX4550 uses a 2-wire I

C-compatible serial

communications protocol, while the MAX4570 uses a

3-wire SPI/QSPI/MICROWIRE-compatible serial com-

munications protocol.

These ICs include four controllable auxiliary outputs,

each capable of sourcing 1mA or sinking 12mA. Also

included are four selectable bias-resistor networks (one

for each output) for use with AC-coupled input signals.

Both devices operate with either ±5V dual supplies or a

single +5V supply, and are optimized for use in the

audio frequency range to 20kHz and at video frequen-

cies up to 4MHz. They feature 80

on-resistance, 10

on-resistance matching between channels, 5

on-

resistance flatness, and as low as 0.004% total harmon-

ic distortion.

The MAX4550/MAX4570 offer better than -110dB of

audio off-isolation, -95dB of audio crosstalk, -78dB of

video off-isolation, and -54dB of video crosstalk

(4MHz). The SA and SB (shunt) inputs further improve

off-isolation, allowing for the addition of external shunt

capacitors or the connection of outputs to AC grounds.

These devices feature a clickless operation mode for

noiseless audio switching. Clickless or standard switch-

ing mode is selectable for each individual output using

the serial interface.

__________

Applic ations Information

The MAX4550/MAX4570 are divided into five functional

blocks: the control-logic block, two switch-matrix

blocks, the bias-resistor block, and the auxiliary-output

block (see Functional Diagram. The control-logic block

accepts commands via the serial interface and uses

those commands to control the four remaining blocks.

Command-Byte and Data-Byte

Programming

The devices are programmed through their serial inter-

face with a command byte followed by a data byte.

Each bit of the command byte selects one of the func-

tional blocks to be controlled by the subsequent data

byte. The data byte sets the state of the selected

block(s). For the two switch-matrix blocks, the data

byte sets the switch state. For the bias-resistor block,

the data byte controls which bias network is active. For

the auxiliary-output block, the data byte programs the

state of the four auxiliary outputs (see Functional

Diagram.

A logic “1” in any bit position of the data byte makes

that function active, while a logic “0” makes it inactive.

Tables 1–4 describe the command byte and the corre-

sponding data byte. For example, if bit C4 of the com-

mand byte is set, the subsequent data byte programs

the state of the auxiliary outputs. If bits D0 and D2 of

the subsequent data byte are set, Q0 and Q2 outputs

are set high. If more than one bit of the command byte

is set, the data byte programs

all

of the corresponding

blocks. This operation is useful, for instance, to simulta-

neously set both switch matrices to the same configura-

tion. Any block that is not selected in the command

byte remains unchanged.

Don’t care

BIAS/MODE

AUX

COM2B

COM1B

BIT

COM2A

COM1A

Don’t care

Controls the switch connected to S_ ;