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參數(shù)資料
| 型號(hào)： | SDA 4335 |
| 廠商： | SIEMENS AG |
| 元件分類： | 通用總線功能 |
| 英文描述： | PLL Frequency Synthesizer, IF Counter, 7 bit ADC, 7 & 4 bit DAC(包含IF計(jì)數(shù)器,7位ADC,7和4位DAC的用于汽車收音機(jī)的鎖相環(huán)頻率合成器) |
| 中文描述： | 鎖相環(huán)頻率合成器，中頻計(jì)數(shù)器，7位ADC，7 |
| 文件頁(yè)數(shù)： | 16/33頁(yè) |
| 文件大?。?/td> | 676K |
| 代理商： | SDA 4335 |
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Specification
SDA 4335
Semiconductor Group
16
21.5.99
3//6\QWKHVL]HU
R / N Counter
The SDA 4335 has 2 identical 16bit counter for R and N path. Input frequency for the R-counter is
the buffered XTAL-frequency (61.5MHz). Tuning steps can be selected by the 16bit R-counter from
f
R
= 6.25kHz...100kHz. Input frequency for the N-counter is the buffered LO-frequency (in FM mode
98.2MHz...118.7MHz).
Three State Phase Comparator
The phase comparator generates a phase error signal according to phase difference between f
R
(R
counter output) and f
N
(N counter output).This phase error signal drives the charge pump current
generator. Polarity is fixed positiv for this application note.
Charge Pump
The charge pump generates signed pulses of current. 4 current values and 2 outputs are available.
Loop Amp
The integrated rail to rail loop amplifier allows an active loop filter design with external components.
Two modes are availiable with status bit D11: high speed and normal mode.
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