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參數(shù)資料
| 型號： | MC12202 |
| 廠商： | Motorola, Inc. |
| 英文描述： | MECL PLL COMPONENTS Serial Input PLL Frequency Synthesizer |
| 中文描述： | 梅奇爾PLL元件串行輸入鎖相環(huán)頻率合成器 |
| 文件頁數(shù)： | 6/12頁 |
| 文件大?。?/td> | 162K |
| 代理商： | MC12202 |
MC12202
MOTOROLA
HIPERCOMM
BR1334 — Rev 4
6
PHASE CHARACTERISTICS/VCO CHARACTERISTICS
The phase comparator in the MC12202 is a high speed digital phase frequency detector circuit. The circuit determines the “l(fā)ead”
or “l(fā)ag” phase relationship and time difference between the leading edges of the VCO (fp) signal and the reference (fr) input.
Since these edges occur only once per cycle, the detector has a range of
±
2
π
radians. The phase comparator outputs are
standard CMOS rail–to–rail levels (VP to GND for
φ
P and VCC to GND for
φ
R), designed for up to 20MHz operation into a 15pF
load. These phase comparator outputs can be used along with an external charge pump to enhance the PLL characteristics.
The operation of the phase comparator is shown in Figures 3 and 5. The phase characteristics of the phase comparator are
controlled by the FC pin. The polarity of the phase comparator outputs,
φ
R and
φ
P, as well as the charge pump output Do can be
reversed by switching the FC pin.
Figure 3. Phase/Frequency Detector, Internal Charge Pump and Lock Detect Waveforms
fr
fp
LD
Do (FC = H)
BISW (LE = H or Open)
φ
R (FC = H)
φ
P (FC = H)
Do (FC = L)
BISW (LE = H or Open)
φ
R (FC = L)
φ
P (FC = L)
H
L
H
L
H
L
Source
Z
Sink
H
L
H
L
Source
Z
Sink
H
L
H
L
NOTES: Do and BISW are current outputs.
Phase difference detection range: –2
π
to +2
π
Spike difference depends on charge pump characteristics. Also, the spike is output in order to diminish dead band.
When fr > fp or fr < fp, spike might not appear depending upon charge pump characteristics.
Internal Charge Pump Gain
Isource
Isink
4
4mA
4
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MC12202D | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:MECL PLL COMPONENTS Serial Input PLL Frequency Synthesizer |
| MC12202DT | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:MECL PLL COMPONENTS Serial Input PLL Frequency Synthesizer |
| MC12202M | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:MECL PLL COMPONENTS Serial Input PLL Frequency Synthesizer |
| MC122032B6W-BNMLW | 制造商:MIDAS 功能描述:LCD 122X32 BSTN WHITE ON BL 制造商:MIDAS 功能描述:LCD, 122X32, BSTN, WHITE ON BLUE 制造商:MIDAS 功能描述:LCD, 122X32, BSTN, WHITE ON BLUE; Backlighting Colour:White; LCD Display Type:STN; Pixel Size (H x W):0.375mm x 0.375mm; Pixel Pitch (H x W):0.04mm x 0.04mm; Display Mode:Transmissive; Viewing Area (H x W):17.9mm x 64mm; Supply ;RoHS Compliant: Yes |
| MC122032B6W-FPTLW | 制造商:MIDAS 功能描述:LCD 122X32 FSTN BLACK ON WH 制造商:MIDAS 功能描述:LCD, 122X32, FSTN, BLACK ON WHITE 制造商:MIDAS 功能描述:LCD, 122X32, FSTN, BLACK ON WHITE; Backlighting Colour:White; LCD Display Type:FSTN; Pixel Size (H x W):0.45mm x 0.4mm; Pixel Pitch (H x W):0.04mm x 0.04mm; Display Mode:Transflective; Viewing Area (H x W):17.9mm x 64mm; Supply ;RoHS Compliant: Yes |
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