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參數(shù)資料
| 型號(hào)： | U2893B |
| 英文描述： | Modulation PLL for GSM, DCS and PCS Systems |
| 中文描述： | 調(diào)制鎖相環(huán)用于GSM，DCS和PCS系統(tǒng) |
| 文件頁(yè)數(shù)： | 7/14頁(yè) |
| 文件大小： | 294K |
| 代理商： | U2893B |
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U2893B
Preliminary Information
TELEFUNKEN Semiconductors
Rev. A1, 29-Jan-97
7 (14)
Mode Selection
The device can be programmed to different modes via an external resistor (including short, open) connected between
Pin MC and VS2. The mode selection controls the N-, R-divider ratios, and the polarity of the charge pump current.
Mode Selection
Resistance between Pin MC
and Pin VS2
0 (<50 )
2.7 k (
±
5%)
10 k (
±
5%)
36 k (
±
5%)
(>1 M )
Frequencies referred to PFD input!
N-Divider
R-Divider
CPO Current Polarity
f
N
< f
R
1)
Application
Mode
f
N
< f
R
1)
1
2
3
4
5
3:1
2:1
2:1
3:1
3:1
5:1
5:1
6:1
6:1
6:1
Sink
Source
Source
Source
Sink
Source
Sink
Sink
Sink
Source
GSM
PCS
DCS
GSM
GSM
1)
Equivalent Circuits at the IC’s Pins
Vref_input
VS1
MDO
NMDO
I, Q
NI, NQ
GND
Vbias_MDLO
2230
250
30p
MDLO
Vref_MDLO
Vref_output
Baseband input
LO input
Output
Figure 5. I/Q modulator
40p
MIXLO
Vref_RF
NRF
MIXO
VS3
6.3
Vbias_RF
RF
890
1k
Vref_LO
Vbias_LO
1k
1.6k
GND
890
1.6k
RF input
LO input
Output
Figure 6. Mixer
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