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參數資料
| 型號： | S1M8836 |
| 廠商： | SAMSUNG SEMICONDUCTOR CO. LTD. |
| 英文描述： | FRACTIONAL-N RF/INTEGER-N IF DUAL PLL |
| 中文描述： | 分數N射頻/整數N如果雙鎖相環(huán) |
| 文件頁數： | 12/29頁 |
| 文件大小： | 234K |
| 代理商： | S1M8836 |
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S1M8836/37
FRACTIONAL-N RF/INTEGER-N IF DUAL PLL
12
When the PLL is in the locked state, the RF VCO's frequency will be N
INT
+ N
FRAC
times the comparison
frequency, where N
INT
is the integer divide ratio and N
FRAC
is the fractional component.
The S1M8836/37 has new improved features compared to conventional Integer-N PLLs.
The fractional-N PLL is available for the RF. The fractional synthesis frequency as is AMPS and IS-95A/B/C.
This makes it possible to widen the loop bandwidth as wide as 20kHz or wider for a faster lock-up time and to
improve the in-band phase noise performance due to the reduced divide ratio N. Such S1M8836/37 in the
fractional-N mode is suitable for CDMA, GSM and PCS band applications.
Also, from the programmability of the charge pump, the users can easily design a stable loop by free selection of
loop components and reach to the low spurious, the low power PLL by an optimized current selection.
Prescaler
The RF/IF prescaler consists of a differential input buffer and ECL frequency dividers. The input buffer amplifies
the input signal from the external VCO to the required level set by sensitivity requirements. The output of the
amplifier delivers a differential signal to the divider with the correct DC level. The buffer may be either single-
ended or differentially driven. The single-ended operation is preferred in typical applications due to external VCO.
In this case, we recommend that the complementary input /fin of the input buffer be AC coupled to ground
through external capacitors, even though it is internally coupled to ground via an internal 10pF capacitor. The
other input pin fin of the buffer also needs external capacitor for decoupling the DC component and controlling
the input power level.
The RF prescalers of S1M8836 and S1M8837 provide 8/9/12/13 and 16/17/20/21 prescaler ratio, respectively.
The IF prescaler of S1M8836/37 contains 8/9 dual modulus prescaler.
Reference Oscillator Inputs
The reference oscillator frequency is provided by an external reference such as TCXO through the OSC
in
.
It drives both the IF R and RF R counters.
Programmable Dividers (RF/IF N Counters)
The RF N counter can be configured as a fractional counter. The fractional-N counter is selected when the
Frac-N_SEL bit becomes HIGH.
In the fractional mode, the S1M8836 is capable of offering a continuous integer divide range from 25 to 1023 and
the S1M8837 offering a continuous integer divide range from 49 to 2047.
The S1M8836/37 IF N counter supports an integer counter mode only, not including fractional counter, and is
capable of operating from 45MHz to 520MHz offering a continuous integer divide range from 72 to 32767.
相關PDF資料 |
PDF描述 |
|---|---|
| S1M8836X01-G0T0 | FRACTIONAL-N RF/INTEGER-N IF DUAL PLL |
| S1M8837 | FRACTIONAL-N RF/INTEGER-N IF DUAL PLL |
| S1M8837X01-G0T0 | FRACTIONAL-N RF/INTEGER-N IF DUAL PLL |
| S1PG | High Current Density Surface Mount Glass-Passivated Rectifiers |
| S1PJ | High Current Density Surface Mount Glass-Passivated Rectifiers |
相關代理商/技術參數 |
參數描述 |
|---|---|
| S1M8836X01-G0T0 | 制造商:SAMSUNG 制造商全稱:Samsung semiconductor 功能描述:FRACTIONAL-N RF/INTEGER-N IF DUAL PLL |
| S1M8837 | 制造商:SAMSUNG 制造商全稱:Samsung semiconductor 功能描述:FRACTIONAL-N RF/INTEGER-N IF DUAL PLL |
| S1M8837X01-G0T0 | 制造商:SAMSUNG 制造商全稱:Samsung semiconductor 功能描述:FRACTIONAL-N RF/INTEGER-N IF DUAL PLL |
| S1MA | 制造商:VISHAY 制造商全稱:Vishay Siliconix 功能描述:Standard Surface Mount Glass Passivated Rectifier |
| S1MA-E3/5AT | 功能描述:整流器 1.0 Amp 1000 Volt 30A IFSM @ 8.3ms RoHS:否 制造商:Vishay Semiconductors 產品:Standard Recovery Rectifiers 配置: 反向電壓:100 V 正向電壓下降: 恢復時間:1.2 us 正向連續(xù)電流:2 A 最大浪涌電流:35 A 反向電流 IR:5 uA 安裝風格:SMD/SMT 封裝 / 箱體:DO-221AC 封裝:Reel |
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