參數(shù)資料
型號: ZL20250LCF
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): 36/56頁
文件大?。?/td> 392K
代理商: ZL20250LCF
ZL20250
Data Sheet
36
Zarlink Semiconductor Inc.
2.4.2 TCXO Reference Selection
Bits 20:19 are used to set the device to the required TCXO reference frequency.
2.4.3 Discriminator Output Filtering
Bits 17:14 set up on chip filtering of the FM output signal and are therefore only used in AMPS mode. Two cascaded
filters can be selected and the bandwidth can be set to 25 or 37.5 kHz cut-off. Bits 17,16 (PDF) select the filters and
bits 15,14 set the cutoff frequency.
In GSM and IS136 modes Bits <17:14> should be set to 0000. It is recommended that if the additional discriminator
filtering is required in AMPS mode then both filters should be used with 25 kHz bandwidth, i.e. Bits<17:14> should
be set 1111.
TCXO<1>
Bit 20
TCXO<0>
Bit 19
TCXO Frequency
(MHz)
0
0
13.0
0
1
14.4
1
0
19.44
1
1
26.0
<17>
<16>
<15>
<14>
Filter Selection
0
0
X
X
No filters
0
1
X
X
Filter 1 selected
1
0
X
X
Filter 2 selected
1
1
X
X
Filters 1 and 2 selected
X
X
0
0
Both filters 37.5 kHz
X
X
0
1
Filter 1 25kHz, Filter 2 37.5kHz
X
X
1
0
Filter 1 37.5 kHz, Filter 2 25 kHz
X
X
1
1
Both filters 25kHz
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