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參數(shù)資料
| 型號(hào)： | LMX2525LQX1321 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | XO, clock |
| 英文描述： | PLLatinum Dual Frequency Synthesizer System with Integrated VCOs |
| 中文描述： | PLL FREQUENCY SYNTHESIZER, 26 MHz, QCC24 |
| 封裝： | 5 X 4 MM, 0.75 MM HEIGHT, LLP-24 |
| 文件頁數(shù)： | 13/17頁 |
| 文件大小： | 237K |
| 代理商： | LMX2525LQX1321 |
Programming Description
(Continued)
R0 REGISTER
The R0 register address bits (R0 [1:0]) are “00”.
The Rx/Tx bit selects between receive and transmit modes and, in conjunction with the band select bit (BS), the channel spacing
to be synthesized.
The RF_PD bit selects the power down mode of the RF PLL and selected VCO.
The HS bit selects between normal and high speed locking mode.
The BS bit determines which of the two internal VCOs (PDC800 or PDC1500) is active.
The RF N counter consists of the 4-bit programmable counter (RF_B counter), the 3-bit swallow counter (RF_A counter) and the
10-bit delta sigma modulator (RF_FN counter). The equations for calculating the counter values are presented below.
R0 REGISTER
R
MSB
23
SHIFT REGISTER BIT LOCATION
16
15
14
13
Data Field
LSB
0
22
21
20
19
18
17
12
11
10
9
8
7
6
5
4
3
2
1
Address
Field
0
R0
(Default)
RX/
TX
RF_
PD
HS
0
BS
RF_B
[3:0]
RF_A
[2:0]
RF_FN
[9:0]
0
Name
RX/TX
Functions
RX/TX Mode
0 = Rx
1 = Tx
Power Down of RF Synthesizer
0 = RF synthesizer on (Active mode)
1 = RF synthesizer powered down
Locking Mode
0 = Normal Mode
1 = High Speed Mode
Band Select
1 = RF1 VCO (PDC1500)
0 = RF2 VCO (PDC800)
RF_B Counter
4-bit programmable counter
0
≤
RF_B
≤
15 for both bands
RF_A Counter
3-bit swallow counter
0
≤
RF_A
≤
7 for PDC1500
0
≤
RF_A
≤
3 for PDC800
RF_FN Counter
10-bit modulus counter
0
≤
RF_FN
<
FD See
Table 6
for FD values.
RF_PD
HS
BS
RF_B [3:0]
RF_A [2:0]
RF_FN [9:0]
Counter Name
Modulus Counter
Programmable Counter
Swallow Counter
Symbol
RF_FN
RF_B
RF_A
Functions
RF N Divider
N = 8 x RF_B + RF_A + RF_FN/FD (PDC1500)
N = 4 x RF_B + RF_A + RF_FN/FD (PDC800)
L
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMX2525LQX1321/NOPB | 功能描述:IC FREQ SYNTH DUAL VCO 24-LLP RoHS:是 類別:RF/IF 和 RFID >> RF 其它 IC 和模塊 系列:PLLatinum™ 標(biāo)準(zhǔn)包裝:100 系列:* |
| LMX2531 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:High Performance Frequency Synthesizer System with Integrated VCO |
| LMX2531_07 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:High Performance Frequency Synthesizer System with Integrated VCO |
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