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(yè)數(shù)： 30/56頁(yè)
文件大小： 392K
代理商： ZL20250
ZL20250
Data Sheet
30
Zarlink Semiconductor Inc.
The function of the transmit bits is shown below:
Control bits TX<11:4> allow optimization of the transmit output stage. This allows variation of the decrease in supply
current with decreasing agc voltage and also allows optimization depending on output power and linearity
requirements. Figure 15 shows the variation of output stage supply current with agc voltage and the programmable
characteristics. The maximum current, agc threshold and slope can be programmed. The minimum current is not
programmable.
TX<11:10> (bits 15,14) allow the gain of the transmit output stage to be varied in 3 dB steps as shown in the table
below:
Register Bit
No.
Control
Bit
Action if '0'
Action if '1'
15
TX<11>
Transmit output stage gain control
14
TX<10>
13
TX<9>
Control of RF Transmit output stage current with VGA control voltage.
Nominal value for TX<11:4> is 101010
12
TX<8>
11
TX<7>
10
TX<6>
9
TX<5>
8
TX<4>
7
TX<3>
900 MHz output
1900MHz output
6
TX<2>
Internal
External transmit IF Filter
5
TX<1>
IS136 baseband filters
GSM/EDGE baseband filters
4
TX<0>
Transmit baseband filters selected
Transmit baseband filters by-passed
TX<11>
TX<10>
Gain (dB)
0
0
-6
0
1
-3
1
0
Nominal
1
1
+3
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