- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄225366 > U2894B-AFSG3 Modulation PLL for GSM, DCS and PCS Systems PDF資料下載
參數(shù)資料
| 型號： | U2894B-AFSG3 |
| 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) |
| 文件頁數(shù)： | 2/16頁 |
| 文件大?。?/td> | 802K |
| 代理商： | U2894B-AFSG3 |
U2894B
Rev. A4, 30-Sep-98
10 (16)
Application Hints
Interfacing
For some of the baseband ICs it may be necessary to
reduce the I/Q voltage swing so that it can be handled by
the U2894B. In those cases, the following circuitry can be
used.
14562
II
R
2
R
1
R
1
R
2
R
1
R
1
NI
Q
NQ
Baseband IC
NI
Q
NQ
U2894B
Figure 13. Interfacing the U2894B to I/Q baseband circuits
Due to a possible current offset in the differential base-
band inputs of the U2894B the best values for the carrier
suppression of the I/Q modulator can be achieved with
voltage driven I/NI-, and Q/NQ-inputs. A value of
Rsource = R2/2*RS
v 1.5 kW should be realized. RS is the
sum of R1 (above drawing) and the output resistance of
the baseband IC.
Charge-Pump Current Programming
12497
1 nF
GND
CPC
R
CPC2 = 1 k (incl. rds_on of FET)
R
CPC1 = 2.2 k
R
CPC2
R
CPC1
|I
CPO | = 4 mA
|I
CPO | = 2 mA
‘H’
‘L’
Figure 14. Programming the charge-pump current
Mode Control
14563
R
Mode1
R
Mode2
VS2
MC
U2894B
VS2
MC
U2894B
R
Mode
VS2
MC
U2894B
VS2
MC
U2894B
R
Mode
36 k
or
10 k
R
Mode
a) any single mode
b) any 2 modes
c) any mode
& mode 5
d) mode 5 & mode 3 or mode 4
Figure 15. Application examples for programming
different modes
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| U3900BM | Programmable Telephone Audio Processor |
| U3900BM-AFN | Programmable Telephone Audio Processor |
| U3900BM-AFNG3 | Programmable Telephone Audio Processor |
| U4479B | DVB-Cable IF Converter and Full Multi-Standard Video-/Sound IF Processing |
| U4479B-MFLG3 | DVB-Cable IF Converter and Full Multi-Standard Video-/Sound IF Processing |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| U2895B | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Modulation PLL for GSM, DCS and PCS Systems |
| U2896B | 制造商:TEMIC 制造商全稱:TEMIC Semiconductors 功能描述:Modulation PLL for GSM, DCS and PCS Systems |
| U2896B-MFCG3 | 制造商:TEMIC 制造商全稱:TEMIC Semiconductors 功能描述:Modulation PLL for GSM, DCS and PCS Systems |
| U28J16Z3GE22 | 功能描述:搖臂開關(guān)與扳鈕開關(guān) RoHS:否 制造商:C&K Components 觸點形式: 開關(guān)功能: 電流額定值:50 mA 電壓額定值 AC: 電壓額定值 DC:30 V 功率額定值: 端接類型: 執(zhí)行器:Paddle 顏色: 安裝風(fēng)格:Panel 端子密封: 觸點電鍍: 照明:Not Illuminated 照明顏色: |
| U28J16Z3QE2 | 制造商:C&K Components 功能描述:SWIT RCKR ON NONE MOM DPDT QC RCKR 5A 250VAC 28VDC - Bulk |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。