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CAT525JITE13

更新时间： 2024-11-28 04:29:07
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Configured Digitally Programmable Potentiometer (DPP⑩): Programmable Voltage Applications

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CAT525JITE13 数据手册

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CAT525  
Configured Digitally Programmable Potentiometer (DPP™): Programmable Voltage Applications  
APPLICATIONS  
FEATURES  
■ Automated product calibration  
■ Four 8-bit DPPs configured as programmable  
voltage sources in DAC-like applications  
■ Remote control adjustment of equipment  
■ Independent reference inputs  
■ Offset, gain and zero adjustments in  
self-calibrating and adaptive control systems  
■ Buffered wiper outputs  
■ Tamper-proof calibrations  
■ Non-volatile NVRAM memory wiper storage  
■ Output voltage range includes both supply rails  
■ DAC (with memory) substitute  
■ 4 independently addressable buffered  
output wipers  
■ 1 LSB accuracy, high resolution  
■ Serial µP interface  
■ Single supply operation: 2.7V-5.5V  
■ Setting read-back without effecting outputs  
DESCRIPTION  
stated when power is returned. Each wiper can be  
dithered to test new output values without effecting the  
stored settings and stored settings can be read back  
without disturbing the DPP’s output.  
The CAT525 is a quad 8-Bit digitally programmable  
potentiometer (DPP™) configured for programmable  
voltage and DAC-like applications. Intended for final  
calibration of products such as camcorders, fax ma-  
chines and cellular telephones on automated high vol-  
ume production lines and systems capable of self cali-  
bration, it is also well suited for applications were equip-  
ment requiring periodic adjustment is either difficult to  
access or located in a hazardous environment.  
Control of the CAT525 is accomplished with a simple 3  
wire serial interface. A Chip Select pin allows several  
CAT525's to share a common serial interface and  
communicationsbacktothehostcontrollerisviaasingle  
serial data line thanks to the CAT525’s Tri-Stated Data  
Output pin. A RDY/BSY output working in concert with  
aninternallowvoltagedetectorsignalsproperoperation  
of non-volatile NVRAM Memory Erase/Write cycle.  
The CAT525 offers four independently programmable  
DPPs each having its own reference inputs and each  
capable of rail to rail output swing. The wipers are  
buffered by rail to rail op amps. Wiper settings, stored in  
non-volatile NVRAM memory, are not lost when the  
device is powered down and are automatically rein-  
The CAT525 is available in the 0°C to 70°C commercial  
and –40°C to 85°C industrial operating temperature  
ranges and offered in 20-pin plastic DIP and Surface  
mount packages.  
FUNCTIONAL DIAGRAM  
PIN CONFIGURATION  
V
H1  
V
V
H3  
V
REF  
REF  
H2  
H4  
REF  
REF  
2
1
20  
19  
SOIC Package (J)  
DIP Package (P)  
5
9
RDY/BSY  
18  
17  
16  
15  
+
–
H3  
H4  
H2  
20  
19  
18  
17  
16  
15  
V
1
2
3
4
1
2
3
4
5
V
V
V
V
H3  
H4  
OUT  
H2  
20  
19  
18  
17  
16  
15  
REF  
REF  
1
2
3
4
5
V
V
V
V
PROGRAM  
CONTROL  
REF  
REF  
PROG  
H1  
V
REF  
V
H1  
V
REF  
REF  
V
REF  
+
–
V
OUT  
1
D
D
OUT  
1
D
D
OUT  
4
6
NVRAM  
V
2
3
CLK  
CS  
CLK  
V
2
3
OUT  
CLK  
OUT  
+
–
DATA  
CONTROLLER  
V
OUT  
V
V
RDY/BSY  
CS  
V
V
OUT  
RDY/BSY  
CS  
OUT  
7
4
4
6
7
OUT  
6
7
OUT  
+
–
V
CAT525  
OUT  
CAT525  
L4  
L3  
14  
13  
12  
11  
V
V
DI  
DO  
L4  
L3  
REF  
7K  
(ea)  
14  
13  
12  
11  
V
V
DI  
DO  
REF  
8
9
REF  
H.V.  
CHARGE  
PUMP  
8
9
SERIAL  
DATA  
OUTPUT  
REGISTER  
REF  
8
DO  
V
L2  
L1  
PROG  
GND  
V
L2  
L1  
REF  
REF  
PROG  
GND  
REF  
REF  
10  
V
11  
12  
V
13  
14  
V
CAT525  
10  
V
L2  
L4  
REF  
REF  
V
L1  
V
L3  
REF  
REF  
© 2001 by Catalyst Semiconductor, Inc.  
Characteristics subject to change without notice  
Doc. No. 25078-00 4/01-A M-1  
1
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