- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄373782 > ZL20250 (Zarlink Semiconductor Inc.) 2.5G Multimode Transceiver PDF資料下載
參數(shù)資料
| 型號(hào)： | ZL20250 |
| 廠商： | Zarlink Semiconductor Inc. |
| 英文描述： | 2.5G Multimode Transceiver |
| 中文描述： | 2.5G的多模收發(fā)器 |
| 文件頁數(shù)： | 22/56頁 |
| 文件大?。?/td> | 392K |
| 代理商： | ZL20250 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁當(dāng)前第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁
ZL20250
Data Sheet
22
Zarlink Semiconductor Inc.
The compensation value can be calculated from the following formula:
Comp Value = 255 - INT((Icp * Ftcxo)/(0.0245 * 6 * MOD *Fvco))
where
Icp
= charge pump current (uA)
Ftcxo
= Reference frequency
MOD
= Fractional Modulus
Fvco
= UHF VCO Frequency
The synthesizer provides a lock detect output. When the output pulse from the phase detector is less than half a
reference clock period an in-lock signal is generated. These in-lock signals then clock a 4 bit counter into which a
threshold value has been programmed. When the required number of successive in-lock pulses have been
generated the lock detect output is set.
The ZL20250 has a single lock detect output pin for the UHF synthesizer and VHF synthesizers. The lock detect
signal is asserted when all active synthesizers are in lock. If a synthesizer has not been enabled in the power control
registers then that synthesizer will be inactive and will have no effect on the lock detect output.
1.5 VHF Frequency Synthesizer
The ZL20250 includes two VHF synthesizers to generate the second LO for the receiver and the transmit IF. They
operate with their respective on-chip VHF VCO's and off-chip loop filters. The tank circuits and tuning components
for the VCO's are also off chip. The two synthesizers are identical and are shown in Figure 12.
Figure 12 - VHF Frequency Synthesizer
The synthesizer uses a 2 modulus 16/17 prescaler with an 'M' counter and an 'A' swallow counter. This allows
maximum flexibility when using this synthesizer. The reference counter is a simple 14 bit counter. All counter values
are programmed via the serial bus and programming details are shown in the programming section. Both counters
operate as count down. At the start of a count the counters are loaded with their respective values. The initial
Reference Counter
14 bit
Dual Modulus
Prescaler
16/17
M Counter
13 bit
A
4 bit
Phase
Detector
Charge
Pump
Lock Detect
TCXO
VHF LO
VHF
CP
+1
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ZL20250LCE | 2.5G Multimode Transceiver |
| ZL20250LCF | 2.5G Multimode Transceiver |
| ZL30100QDG1 | T1/E1 System Synchronizer |
| ZL30100 | T1/E1 System Synchronizer |
| ZL30100QDC | T1/E1 System Synchronizer |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ZL20250/LCE | 制造商:Microsemi Corporation 功能描述:RF TRNSCVR FM 56QFN - Bulk |
| ZL20250/LCF | 制造商:Microsemi Corporation 功能描述:RF TRNSCVR FM 56QFN - Bulk |
| ZL20250LCE | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:2.5G Multimode Transceiver |
| ZL20250LCF | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:2.5G Multimode Transceiver |
| ZL20B | 制造商:YEASHIN 制造商全稱:YEASHIN 功能描述:500 mW DO-35 Hermetically Sealed Glass Zener Voltage Regulators |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。