參數(shù)資料
型號: 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): 35/56頁
文件大小: 392K
代理商: ZL20250
ZL20250
Data Sheet
35
Zarlink Semiconductor Inc.
2.3.4 Transmit LO Set Up
Bits 10,9 select the charge pump current for the receive VHF PLL as shown below:
2.4 Control Register - Address 6
2.4.1 IS136 Baseband Gain
Bits 22:21 can be used to vary the gain of the baseband output stages in IS136 mode only. The gain of the 60 kHz
IF stage preceding the baseband mixer is also varied so that the overall gain of the device can be maintained if
required. The nominal gain is 20 dB and the recommended setting is BBG<1:0> = 11 to minimize output dc offsets.
Register
Bit No.
Action if '0'
Action if '1'
15
Transmit DLL disabled
Transmit DLL enabled
13
Low side Tx up-converter LO injection
High side Tx up-converter LO injection
12
Tx second LO = VCO/2
Tx second LO = VCO/4
11
Tx LO phase detector polarity normal
Tx LO phase detector polarity inverted
10
Transmit VHF PLL Charge Pump Current - see table below
9
<10>
<9>
Current (mA)
0
0
1.00
0
1
0.50
1
0
0.25
1
1
0.125
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
0
0
1
1
0
BBG
TCXO
PDF
LPC
Tx Gain
R
Mode Control
Address
BBG<1>
Bit 22
BBG<0>
Bit 21
IF Gain
(dB)
Baseband Gain
(dB)
Overall Gain
(dB)
0
0
14
6
20
0
1
17
6
23
1
0
17
0
17
1
1
20
0
20
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