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參數(shù)資料
| 型號(hào)： | U2781B |
| 英文描述： | Frequency Synthesizer |
| 中文描述： | 頻率合成器 |
| 文件頁(yè)數(shù)： | 2/10頁(yè) |
| 文件大?。?/td> | 204K |
| 代理商： | U2781B |
U2781B
TELEFUNKEN Semiconductors
Rev. A3, 26-Nov-97
2 (10)
Functional Description
The IC is controlled by a 3-wire bus with Clock, Data and
Enable inputs for programming the scaling factors of the
programmable counter, the reference counter and the
prescaler.
A TCXO can be connected to the oscillator input (OSCi)
as an alternative solution to the common crystal reference
oscillator. In that case, the oscillator output (OSCo)
should be left open.
The charge pump-output operates as switched current
sources. The characteristics of the phase-locked loop can
be determinated by the external low-pass filter.
The phase characteristic of the phase detector is convert-
ible and thus matchable to different frequency/ tuning
voltage characteristics.
Pin Description
1
2
3
4
5
6
7
8
10
9
19
18
17
16
14
15
13
12
11
20
V
SCP
V
S
14775
CP
GND
LDo
NC
NC
Osco
Mo
NC
PS
Enable
Data
NC
NC
NC
RFi
Clock
Osci
NC
Figure 2. Pinning
Pin
1
2
3
9
10
11
17
18
19
Symbol
Osci
NC
Osco
SCP
s
NC
RFi
Clock
Mo
NC
NC
Function
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Not connected
VCO input
Not connected
Oscillator input
Oscillator output
Not connected
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3-wire bus Clock
Monitor output for f
and f
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Not connected
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Absolute Maximum Ratings
Parameters
Symbol
V
V
Osco
V
BUS
PS
SCP
Value
1
1.5
6
Unit
V
V
V
°
C
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Oscillator output voltage
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Oscillator input voltage
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Bus input voltage
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)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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