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參數(shù)資料
| 型號： | S1M8831A |
| 廠商： | SAMSUNG SEMICONDUCTOR CO. LTD. |
| 英文描述： | FRACTIONAL-N RF/INTEGER-N IF DUAL PLL |
| 中文描述： | 分?jǐn)?shù)N射頻/整數(shù)N如果雙鎖相環(huán) |
| 文件頁數(shù)： | 12/32頁 |
| 文件大小： | 248K |
| 代理商： | S1M8831A |
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S1M8831A/33
FRACTIONAL-N RF/INTEGER-N IF DUAL PLL
12
FUNCTIONAL DESCRIPTION
f
o
LD
Data Out
Multiplexer
CLOCK
DATA
LE
CP
o
RF
∑
-
Modulator
RF
N Counter
RF
Prescaler
RF
Phase
Detector
RF
Charge
Pump
RF
LD
CMOS
Output
MUX
Serial Data Control
RF
R Counter
OSC
in
OUT0
f
o
LD
CMOS
Output
MUX
OUT1
IF
Charge
Pump
CP
o
IF
IF
Phase
Detector
IF
LD
IF
R Counter
IF
N Counter
IF
Prescaler
f
in
RF
f
in
RF
+
-
f
in
IF
f
in
IF
+
-
OSCx
The Samsung S1M8831A/33 is RF/IF dual frequency synthesizer IC which supports Fractional-N mode for RF
PLL and Integer-N mode for IF PLL depending on a program control. S1M8831A/33 combined with external
LPFs and external VCOs forms PLL frequency synthesizer. The frequency synthesizer consists of prescalers,
pulse-swallowed programmable N counters, programmable reference R counters, phase detectors,
programmable charge pumps, analog LD (Lock Detector), serial data control, etc.
An input buffer in the prescalers amplifies an RF input power of -10dBm from external RF/IF VCOs to a
sufficient ECL switching level to drive the following ECL divider so that it can normally operate even in a smaller
input power less than -10dBm. The amplified VCO output signal is divided by the prescaler with a pre-determined
divide ratio (div. 8/9 in S1M8831A, div. 16/17 in S1M8833, div. 8/9 in IF), the N counter, or the Fractional-N
circuitry (
Σ
-
modulator). External reference signal is divided by the R counter to set the comparison frequency
of the PFD. The divide ratios of the programmable counters can be programmed via the serial bus interface.
These two signals drive the both inputs of the phase detector. The phase detector drives the charge pump by
comparing frequencies and phases of the above two signals. The charge pump and the external LPF make the
control voltage for the external VCO and finally the VCO generates the appropriate frequency signal.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| S1M8831A/33 | 制造商:SAMSUNG 制造商全稱:Samsung semiconductor 功能描述:FRACTIONAL-N RF/INTEGER-N IF DUAL PLL |
| S1M8831A01-G0T0 | 制造商:SAMSUNG 制造商全稱:Samsung semiconductor 功能描述:FRACTIONAL-N RF/INTEGER-N IF DUAL PLL |
| S1M8833 | 制造商:SAMSUNG 制造商全稱:Samsung semiconductor 功能描述:FRACTIONAL-N RF/INTEGER-N IF DUAL PLL |
| S1M8833X01-G0T0 | 制造商:SAMSUNG 制造商全稱:Samsung semiconductor 功能描述:FRACTIONAL-N RF/INTEGER-N IF DUAL PLL |
| S1M8836 | 制造商:SAMSUNG 制造商全稱:Samsung semiconductor 功能描述:FRACTIONAL-N RF/INTEGER-N IF DUAL PLL |
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