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參數(shù)資料
| 型號： | MAX4550-MAX4570 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | 數(shù)字信號處理 |
| 英文描述： | Fixed-Point Digital Signal Processors 240-BGA MICROSTAR |
| 中文描述： | 串行控制，雙4x2，無咔嗒聲的音頻/視頻模擬交叉點(diǎn)開關(guān) |
| 文件頁數(shù)： | 14/16頁 |
| 文件大小： | 170K |
| 代理商： | MAX4550-MAX4570 |
M
S erially Controlled, Dual 4x2, Clic kless
Audio/Video Analog Crosspoint S witc hes
14
______________________________________________________________________________________
Addressable Serial Interface
To program several MAX4570s individually using a sin-
gle processor, connect DIN of each MAX4570 together
and control
CS
on each MAX4570 separately. To select
a particular device, drive the corresponding
CS
low,
clock in the 16-bit command, then drive
CS
high and
execute the command. Typically, only one MAX4570 is
addressed at a time.
Improving Off-Isolation
To improve off-isolation, connect the SA or SB input to
ground either directly (DC ground) or through capaci-
tors (AC ground). Closing SA or SB effectively grounds
the unused outputs.
Using the Internal Bias Resistors
Use the internal bias-resistor networks to give the
switch outputs a DC bias when the switch terminals are
AC coupled. Programming of the switches that connect
the bias resistors to the outputs is accomplished via bit
C5 of the command byte. Connect the BIASH and
BIASL inputs to DC levels (for example, V+ and GND),
and activate the switch connecting the appropriate out-
put. This applies a voltage midway between V
BIASH
and V
BIASL
to the output (refer to Tables 1, 4, and the
Functional Diagram.
Using the Auxiliary Outputs
The four auxiliary outputs provide a way to control
external circuitry, such as LEDs or other DC loads,
through the serial interface. Program these outputs via
bit C4 of the command byte. Each output is capable of
sourcing 1mA or sinking 12mA. They are programmed
through the command byte and data byte (refer to
Tables 1, 3, and the Functional Diagram.
Clic kless S witc hing
Audible switching transients (“clicks”) are eliminated in
this mode of operation. When an output is configured
as “clickless,” the gate signal of the switches connect-
ed to that output are controlled with slow-moving volt-
ages. As a result, the output slew rates are significantly
reduced. Program clickless operation via bit C5 of the
command byte (refer to Tables 1, 4, and the Functional
Diagram. Each operating switch may draw as much as
2mA during transition.
Power-Up S tate
The MAX4550/MAX4570 feature a preset power-up
state. Upon power-up, COM1A and COM2A are con-
nected to SA, COM1B and COM2B are connected to
SB, all outputs are set to clickless mode, all bias-resis-
tor networks are disconnected from the outputs, and all
auxiliary outputs are low. All other switches are open.
Table 6. 3-Wire Serial-Interface Data Format
X = Don’t care
X
MSB
C7
X
C6
AUX
C4
C5
BIAS
COM1B
C2
C3
COM1A
COM2B
C0
C1
COM2A
COMMAND BYTE
D6
D6
D7
D7
D4
D4
D5
D5
D2
D2
D3
D3
LSB
D0
D0
DATA BYTE
D1
D1
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| MAX4550CWI | Fixed-Point Digital Signal Processors 240-BGA MICROSTAR |
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