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參數資料
| 型號： | U2781B |
| 英文描述： | Frequency Synthesizer |
| 中文描述： | 頻率合成器 |
| 文件頁數： | 5/10頁 |
| 文件大小： | 204K |
| 代理商： | U2781B |
U2781B
TELEFUNKEN Semiconductors
Rev. A3, 26-Nov-97
5 (10)
Timing 3-Wire Bus
C = 1 : Reference scaler date
93 7787 e
MSB
P 17
LSB
C = 0 : Prog. scaler data
R 0
P 0
R 6
P 8
R 7
P 9
R 13
P 16
PSC
Enable
Clock
Data
t
5
t
1
t
2
t
3
t
4
All times t
1
to t
5
> 1 s
Figure 3.
Phase-Detector Polarity
The polarity of the phase detector can be changed with the
PS input. Depending on the PS input level, the charge-
pump current will also be inverted. The monitor output
signal MO (emitter follower output with ECL level) will
be switched over from f
P
to f
R
simultanously.
CP
I
sink
source
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f
R
> f
P
R
P
R
P
MO
f
R
R
R
CP
I
source
sink
MO
f
P
P
P
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Depending on the VCO frequency versus tuning voltage characteristic, the PS input has to be programmed as follows:
For increasing tuning voltage and increasing frequency:
PS = High or open
PS = Low.
decreasing frequency:
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相關代理商/技術參數 |
參數描述 |
|---|---|
| U2781B-AFS | 制造商:TEMIC 制造商全稱:TEMIC Semiconductors 功能描述:Frequency Synthesizer |
| U2781B-AFSG3 | 制造商:TEMIC 制造商全稱:TEMIC Semiconductors 功能描述:Frequency Synthesizer |
| U2782B | 制造商:TEMIC 制造商全稱:TEMIC Semiconductors 功能描述:1100 MHz Twin PLL |
| U2782B-AFS | 制造商:TEMIC 制造商全稱:TEMIC Semiconductors 功能描述:1100 MHz Twin PLL |
| U2782B-AFSG3 | 制造商:TEMIC 制造商全稱:TEMIC Semiconductors 功能描述:1100 MHz Twin PLL |
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