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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 |
| 文件頁數(shù)： | 4/10頁 |
| 文件大?。?/td> | 204K |
| 代理商： | U2781B |
U2781B
TELEFUNKEN Semiconductors
Rev. A3, 26-Nov-97
4 (10)
Functional Description
The reference- and the programmable counter can be
programmed by the 3-wire bus (Clock, Data and Enable).
The Data Signal is transfered bit by bit into the shift
register during the rising edge, starting with the MSB-bit.
As soon as the enable signal is in high condition, the
content of the shift register will be taken over either into
the 15-bit reference counter latch (C = H) or into the
18-bit latch of the programmable counter (C = L)
Reference Counter
(15bit shift register)
áááááááááááááááááááááááááááá
ááááááááááááááá
áááááááááááááá
áááááááááááááááááááááááááááá
R0
R1
R2
R7
R8
R9
R10
R11
R12
C:
PSC: Prescaler scaling factor bit: High – 64/65
Control bit High
Low – 128/129
S
PSC
= 64 or 128
These bits are setting the reference counter S
R
S
R
= R0
2
0
+ R1
2
1
+ to + R12
permitted scaling factors for S
R
: 4 to 16383
R0 to R13:
2
12
+ R13
2
13
Programmable Counter
(18-bit shift register)
ááááááááááááááááááááááááááááá
ááááááá
S2
áááá
S4
ááá
S6
áááááá
M2
áááá
M4
áááá
M6
áááá
M8
ááááá
M10
ááááááááááááááááááááááááááááá
C:
S0 to S6:
Control bit Low
These bits are setting the swallow counter S
S
.
S
S
= S0
2
0
+ S1
2
1
+ to + S5
permitted scaling factors for S
S
: 0 to 127, S
S
< S
M
M0 to M10 : These bits are setting the main counter S
M
.
S
M
= M0
2
0
+ M1
permitted scaling factors for S
M
: 4 to 2047
2
5
+ S6
2
6
2
1
+ to + M9
2
9
+ M10
2
10
Total scaling factor S
P
of the programmable counter
S
P
= (S
PSC
S
M
) + S
S
Condition: S
S
< S
M
VCO Frequency
f
VCO
= ((S
PSC
S
M
) + S
S
)
f
RefOsc
/ S
R
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| U2782B | Ring Tongue Solderless Terminal; RoHS Compliant: Yes |
| U2782B-AFS | Ring Tongue Solderless Terminal; Wire Size (AWG):6; Stud Size:#10 RoHS Compliant: Yes |
| U2782B-AFSG3 | 1100 MHz Twin PLL |
| U2794 | 1000 MHz Quadrature Demodulator |
| U2794B | 1000 MHz Quadrature Demodulator |
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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