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參數(shù)資料
| 型號： | LMX2505 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | PLLatinu Dual Frequency Synthesizer System with Integrated VCOs |
| 中文描述： | PLLatinu雙頻率合成系統(tǒng)的集成和VCO |
| 文件頁數(shù)： | 12/16頁 |
| 文件大?。?/td> | 231K |
| 代理商： | LMX2505 |
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
www.national.com
12
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMX25051321EVAL/NOPB | 功能描述:EVALUATION BOARD FOR LMX25051321 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估演示板和套件 系列:PLLatinum™ 標準包裝:1 系列:PCI Express® (PCIe) 主要目的:接口，收發(fā)器，PCI Express 嵌入式:- 已用 IC / 零件:DS80PCI800 主要屬性:- 次要屬性:- 已供物品:板 |
| LMX2505LQ1321 | 制造商:Texas Instruments 功能描述:PLL VCO CDMA SMD 2505 LLP-28 |
| LMX2505LQ1321/NOPB | 功能描述:IC FREQ SYNTH DUAL W/VCO 28LLP RoHS:是 類別:RF/IF 和 RFID >> RF 其它 IC 和模塊 系列:PLLatinum™ 標準包裝:100 系列:* |
| LMX2505LQX1321 | 功能描述:IC SYNTHESIZER PLL VCO 28-LLP RoHS:是 類別:RF/IF 和 RFID >> RF 其它 IC 和模塊 系列:PLLatinum™ 標準包裝:100 系列:* |
| LMX2512 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PLLatinum⑩ Frequency Synthesizer System with Integrated VCO |
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