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參數(shù)資料
| 型號(hào)： | LMX2512LQX0967/NOPB |
| 廠(chǎng)商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類(lèi)： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 19.68 MHz, QCC28 |
| 封裝： | 5 X 5 MM, 0.75 MM HEIGHT, LLP-28 |
| 文件頁(yè)數(shù)： | 2/18頁(yè) |
| 文件大?。?/td> | 184K |
| 代理商： | LMX2512LQX0967/NOPB |
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Programming Description
GENERAL PROGRAMMING INFORMATION
The serial interface 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 clock signal. When the latch enable signal transitions from
LOW to HIGH, the data stored in the shift register is transferred to the proper register depending on the address bit settings. 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 initial start-up, the MICROWIRE loading requires 4 default words (registers R3, loaded first, to R0, loaded last). After the device
has been initially programmed, the RF VCO frequency can be changed using a single register (R0). If an IF frequency other than
the default value for the device is desired the SPI_DEF bit should be set to 0, the desired values for IF_A, IF_B, and IF_R entered
and words R6 to R0 should be sent.
The control register content map describes how the bits within each control register are allocated to the specific control functions.
COMPLETE REGISTER MAP
Register
MSB
SHIFT REGISTER BIT LOCATION
LSB
23
22
21
20 19
18 17 16 15 14 13 12
11
10 9 8 7 6 5
4
3
2
1 0
R0
(Default)
SPI_
DEF
RF_
SEL
RF_
LD
0
RF_B
[3:0]
RF_A
[2:0]
RF_FN
[10:0]
00
R1
(Default)
IF_
FREQ
[1:0]
OSC_
FREQ
10
000000
SPUR_
RDT
[1:0]
0
0 1 0 1 OB_
CRL
[1:0]
RF_
EN
IF_
EN
01
R2
(Default)
IF_
CUR[1:0]
0
1
0
011101
1
0
1 0 1 0 0
0
1
0
10
R3
(Default)
BW_
DUR
[1:0]
BW_
CRL
[1:0]
BW_
EN
1011110
1
0
0 0 1 1 0
VCO_
CUR
[1:0]
01 1
R4
0
1
0
IF_A
[3:0]
IF_B
[8:0]
01
1 1
R5
0
1
0
0010
IF_R
[8:0]
01
1
1 1
R6
1
0
000000
0
0 0 0 0 011
1
1 1
NOTE: Bold numbers represent the address bits.
LMX2502/LMX2512
www.national.com
10
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