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SP8853AHC

更新时间： 2024-10-31 22:13:51
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页数 文件大小 规格书
14页 212K
描述
1·3GHz Professional Synthesiser

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SP8853AHC 数据手册

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SP8853A/B  
1·3GHz Professional Synthesiser  
Supersedes March 1997 version, DS2352 - 3.0  
DS2352 - 4.0 March 1998  
The SP8853 is a low power single chip synthesiser  
intended for professional radio applications, containing all the  
elements(apartfromtheloopamplifier)requiredtobuildaPLL  
frequency synthesis loop  
The device is serially programmable by a three-wire data  
highway and contains three independent buffers to store one  
reference divider word and two local oscillator divider words.  
A digital phase detector with two charge pumps,  
programmable in phase and gain, are provided to improve  
lock-up performance. The preset operation of the charge  
pumps can be overwritten or the comparison frequencies  
switched to output ports under control of the divider word. The  
dual modulus ratio and so operating range is also  
programmable through the same word.  
4
3
2
1
28 27 26  
5
25  
24  
23  
22  
21  
20  
19  
F
*
PD2 OUTPUT  
RPD  
REF  
6
POWER DOWN  
7
V
V
4
4
1
V 3  
CC  
EE  
8
GROUND  
XTAL 1  
XTAL2  
SP8853  
CC  
CC  
9
V
A power down mode is incorporated as a battery economy  
feature.  
10  
11  
RF INPUT  
RF INPUT  
V 2  
EE  
The SP8853 is specified at 1·3GHz at 255°C to1125°C (A  
grade) and 240°C to185°C (B grade).  
12 13 14 15 16 17 18  
FEATURES  
■ Improved Digital Phase Detector Eliminates  
‘Dead Band’ Effects  
■ Low Operating Power, Typically 175mW  
■ 1·3GHz Operating Frequency  
■ Complete Phase Locked Loop  
■ High Input Sensitivity  
■ Programmed throughThree-Wire Bus  
■ Wide Range of Reference Division Ratios  
■ Local Storage for Two Frequency Words, giving  
Rapid Frequency Toggling  
■ Programmable Phase Detector Gain  
■ Power Down Mode  
HC28  
*FPD and FREF outputs are reversed by the phase  
detectorsensebitintheF1/F2programmingword. The  
abovediagramiscorrectwhenthesensebitislow. See  
Table 2 and Fig. 7.  
V
V
V
CC1, VEE1 – preamplifier and prescaler supplies  
CC2, VEE2 – oscillator supplies  
CC3, VEE3 – charge pump 2 supplies  
VCC4, VEE4 – ECL supplies  
Fig. 1 Pin identification diagram (top view)  
ABSOLUTE MAXIMUM RATINGS  
ORDERING INFORMATION  
SP8853/A/HC Military temperature range  
SP8853/B/HC Industrial temperature range  
Supply voltage  
20·3V to 17V  
255°C to 1150°C  
2·5V p-p  
Storage temperature  
Prescaler input voltage  
1234567...14

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