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CAT522

更新时间： 2024-11-18 22:54:19
品牌 Logo 应用领域
CATALYST 电位器
页数 文件大小 规格书
10页 73K
描述
8-Bit Dual Digital POT With Independent Reference Inputs

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CAT522 数据手册

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Advanced Information  
CAT522  
8-Bit Dual Digital POT With Independent Reference Inputs  
FEATURES  
APPLICATIONS  
ꢀꢀꢀBuffered Outputs  
ꢀ Automated product calibration.  
ꢀ Output settings retained without power  
ꢀ Independent Reference Inputs  
ꢀ Output range includes both supply rails  
ꢀ Programming voltage generated on-chip  
ꢀ 2 independently addressable outputs  
ꢀ Serial µP interface  
ꢀ Remote control adjustment of equipment  
ꢀ Offset, gain and zero adjustments in Self-  
Calibrating and Adaptive Control systems.  
ꢀ Tamper-proof calibrations.  
ꢀ Single supply operation: 2.7V-5.5V  
DESCRIPTION  
and stored settings can be read back without disturbing  
the DAC’s output.  
TheCAT522isadual8-BitMemoryDACdesignedasan  
electronic replacement for mechanical potentiometers  
and trim pots. Intended for final calibration of products  
such as camcorders, fax machines and cellular tele-  
phones on automated high volume production lines and  
systems capable of self calibration, it is also well suited  
for applications were equipment requiring periodic ad-  
justment is either difficult to access or located in a  
hazardous environment.  
Control of the CAT522 is accomplished with a simple 3  
wire serial interface. A Chip Select pin allows several  
CAT522's to share a common serial interface and com-  
munications back to the host controller is via a single  
serial data line thanks to the CAT522’s Tri-Stated Data  
Output pin. A RDY/BSY output working in concert with  
aninternallowvoltagedetectorsignalsproperoperation  
of EEPROM Erase/Write cycle.  
TheCAT522offers2independentlyprogrammableDACs  
each having its own reference inputs and each capable  
of rail to rail output swing. Outputs are buffered by rail  
to rail OP AMPS Output settings, stored in non-volatile  
EEPROM memory, are not lost when the device is  
powered down and are automatically reinstated when  
power is returned. Each output can be dithered to test  
new output values without effecting the stored settings  
The CAT522 operates from a single 3–5 volt power  
supply. The high voltage required for EEPROM Erase/  
Write operations is generated on-chip.  
The CAT522 is available in the 0°C to 70°C Commercial  
and –40°C to +85°C Industrial operating temperature  
ranges and offered in 14-pin plastic DIP and Surface  
mount packages.  
FUNCTIONAL DIAGRAM  
PIN CONFIGURATION  
V
DD  
1
DIP Package (P)  
SOIC Package (J)  
6
3
7
RDY/BSY  
SERIAL DATA OUTPUT  
DO  
H1  
H2  
H1  
H2  
1
2
3
4
5
14  
13  
12  
11  
14  
13  
12  
11  
V
V
V
V
1
2
3
4
5
V
V
V
V
DD  
REF  
PROGRAM  
CONTROL  
REF  
DD  
PROG  
14  
V
H1  
1
CLK  
REF  
CLK  
REF  
REF  
EEPROM  
12  
9
+
–
V
LATCH  
DAC 1  
1
OUT  
1
OUT  
OUT  
RDY/BSY  
RDY/BSY  
V
L1  
REF  
2
4
V
2
V
2
CLK  
CS  
DI  
CS  
DI  
CS  
DI  
OUT  
OUT  
CAT522  
CAT522  
DATA  
CONTROLLER  
L2  
L2  
10  
V
V
10  
V
V
REF  
REF  
REF  
REF  
13  
11  
10  
V
H2  
2
L1  
L1  
9
DO  
9
REF  
DO  
6
7
5
6
7
EEPROM  
LATCH  
+
–
V
DAC 2  
OUT  
8
GND  
PROG  
8
GND  
PROG  
V
L2  
REF  
H.V.  
CHARGE  
PUMP  
CAT522  
8
GND  
© 2000 by Catalyst Semiconductor, Inc.  
Characteristics subject to change without notice  
1
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