參數(shù)資料
型號(hào)： LMX2542
廠商： National Semiconductor Corporation
英文描述： PLLatinum Cellular and GPS Frequency Synthesizer System with Integrated VCO
中文描述： PLLatinum蜂窩頻率合成器和GPS系統(tǒng)的集成VCO
文件頁(yè)數(shù)： 15/22頁(yè)
文件大小： 253K
代理商： LMX2542
2.0 Programming Description
2.1 MICROWIRE INTERFACE
The MICROWIRE Serial Port Interface (SPI) has a 24-bit shift register to store the incoming DATA bits temporarily. The incoming
DATA is loaded into the shift register from MSB to LSB. The data is shifted at the rising edge of the CLK signal. When the LE
signal transitions from LOW to HIGH, the DATA stored in the shift register is transferred to the proper register depending on the
state of the ADDRESS bits. The selection of the particular register is determined by the address bits equal to the binary
representation of the number of the control register.
At start-up, the 24-bit shift register is loaded via the MICROWIRE interface. The loading requires 3 default words, with register
R2 loaded first, and R0 loaded last. Once loaded, the RF VCO frequency can then be changed by only programming register R0
appropriately. If an IF frequency other than the default value is desired, the SPI_DEF bit should be set to 0, and registers R4 and
R5 programmed appropriately.
2.1.1 Control Register Content Map
The control register content map describes how the bits within each control register are allocated to specific control functions. The
bits that are marked 0 should be programmed as such to ensure proper device operation.
Reg
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
MSB
SHIFT REGISTER BIT LOCATION
LSB
R0
SPI_
DEF
1
RF_
LD
0
RF_B
[3:0]
RF_A
[2:0]
RF_FN
[10:0]
0
0
R1
0
1
1
0
1
0
0
0
1
0
1
0
1
0
1
0
0
1
OB_CRL
[1:0]
RF_
EN
FREQ_
OFF
IF_
EN
0
0
1
R2
1
1
0
0
1
0
0
1
0
0
0
0
0
0
VCO_CUR
[1:0]
OSC_
FREQ
1
IF_FREQ
[1:0]
IF_CUR
[1:0]
1
0
R3
0
0
0
0
0
0
0
0
0
0
0
1
0
1
0
0
0
0
1
0
1
1
R4
0
0
0
0
0
0
0
IF_A
[3:0]
IF_B
[8:0]
0
1
1
1
R5
0
0
0
0
0
0
0
0
0
0
IF_R
[8:0]
0
1
1
1
1
R6
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
0
1
1
1
1
1
Note:
Numbers in
Bold
represent the ADDRESS bits.
L
www.national.com
15
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