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CAT522_07

更新时间： 2024-11-19 04:35:47
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15页 236K
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Configured Digitally Programmable Potentiometer (DPP⑩): Programmable Voltage Applications

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CAT522  
Configured Digitally Programmable Potentiometer (DPP™):  
Programmable Voltage Applications  
FEATURES  
DESCRIPTION  
„ Two 8-bit DPPs configured as programmable  
The CAT522 is a dual, 8-bit digitally-programmable  
potentiometer (DPP™) configured for programmable  
voltage and DAC-like applications. Intended for final  
calibration of products such as camcorders, fax  
machines and cellular telephones on automated high  
volume production lines, it is also well suited for self-  
calibrating systems and for applications where  
equipment which requires periodic adjustment is either  
difficult to access or in a hazardous environment.  
voltage sources in DAC-like applications  
„ Independent reference inputs  
„ Non-volatile NVRAM memory wiper storage  
„ Output voltage range includes both supply rails  
„ 2 independently addressable buffered  
output wipers  
„ 1 LSB accuracy, high resolution  
„ Serial Microwire-like interface  
The CAT522 offers two 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 opamps. Wiper settings, stored  
in non-volatile NVRAM memory, are not lost when the  
device is powered down and are automatically  
reinstated 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.  
„ Single supply operation: 2.7V - 5.5V  
„ Setting read-back without effecting outputs  
For Ordering Information details, see page 14.  
APPLICATIONS  
„ Automated product calibration.  
The CAT522 is controlled with a simple 3-wire,  
microwire-like serial interface. A Chip Select pin  
allows several devices to share a common serial  
interface. Communication back to the host controller is  
via a single serial data line thanks to the CAT522 Tri-  
„ Remote control adjustment of equipment  
„ Offset, gain and zero adjustments in self-  
calibrating and adaptive control systems.  
„ Tamper-proof calibrations.  
¯¯¯¯  
Stated Data Output pin. A RDY/BSY output working  
„ DAC (with memory) substitute.  
in concert with an internal low voltage detector signals  
proper operation of the non-volatile NVRAM memory  
Erase/Write cycle.  
PIN CONFIGURATION  
The CAT522 is available in the 0°C to 70°C  
commercial and -40°C to 85°C industrial operating  
temperature ranges. Both 14-pin plastic DIP and  
surface mount packages are available.  
PDIP 14-Lead (L)  
SOIC 14-Lead (W)  
VDD  
1
2
3
4
5
6
7
14 VREFH1  
13 VREFH1  
12 VOUT1  
11 VOUT2  
10 VREFL2  
CLK  
¯¯¯¯  
RDY/BSY  
CAT522  
CS  
DI  
DO  
8
8
VREFL1  
GND  
PROG  
© Catalyst Semiconductor, Inc.  
Characteristics subject to change without notice  
1
Doc. No. MD-2004 Rev. F  
1234567...15

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