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參數(shù)資料
| 型號(hào)： | LMX2364TMX/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 2600 MHz, PDSO24 |
| 封裝： | TSSOP-24 |
| 文件頁數(shù)： | 21/39頁 |
| 文件大?。?/td> | 694K |
| 代理商： | LMX2364TMX/NOPB |
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Programming Description (Continued)
2.6 R3 REGISTER
The R3 register is used to setup the RF R Divider ratio as well as several other control functions related to the RF synthesizer.
Reg
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9876543210
DATA[20:0]
C2
C1
C0
R3
RF_
RST
RF_
P
RF_
CPP
RF_
CP[1:0]
RF_R[8:0]
RF_FD[6:0]
0
1
2.6.1 RF_FD[6:0] — Fractional Denominator, RF Synthesizer
In Fractional Mode, RF_FD[6:0] is used to specify the fractional denominator of the fractional part of the N counter value. Note
that in this mode, values below 32 are not supported. If a fractional denominator between 2 and 32 is desired, the same N counter
value can be achieved by multiplying the fractional numerator and denominator by some constant factor. For instance, 1/16 can
be expressed as 5/80.
In integer mode, the value represented by this bit multiplies both the RF_N and RF_R counter values. If both of these counter
sizes are sufficiently large, it is recommended to set this bit to one. If the counter sizes are too small, this bit can be used to extend
the counter range.
RF_FD[6:0]
RF_FD
Value
Integer Mode
Fractional Mode
[RF_OM = 0]
RF_OM = 1
0
128
1
Not Supported (Use Integer Mode Instead)
…
Not Supported ( Use a higher value )
32
33
34
……
…
127
Value
Fractional Mode
(RF_OM=1)
Integer Mode
(RF_OM=0)
R Divider Value
RF_R
RF_R x RF_FD
Complete N Divider Value
RF_N x RF_FN/RF_FD
RF_N x RF_FD + RF_FN
See R divider programming (section 2.6.2 ) and N divider programming (Section 2.7.2) for more detailed programming
information.
2.6.2 RF_R[8:0] — R Divider Ratio, RF Synthesizer
RF_R[8:0] is used to specify an integer value from 1 to 511 that is used in calculating the R divider ratio for the RF synthesizer.
In the case that the PLL is operating in fractional mode, the R counter value is simply the value represented by RF_R. However,
in integer mode, the R counter value is calculated by multiplying RF_R by the fractional denominator value.
R (Integer Mode) = RF_R x RF_FD
Since RF_R can take on integer values between 1 – 511 and RF_FD can take on integer values between 1 – 128, this value can
range from 1 - 65408, although prime values between 512 and 65,408 can not be realized.
RF_R[8:0]
RF_R
Value
0
Not Supported
11
……
511
LMX2364
www.national.com
28
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| LMX2370 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PLLatinum⑩ Dual Frequency Synthesizer for RF Personal Communications |
| LMX2370SLBX | 功能描述:IC FREQ SYNTH DUAL 24LAMINATECSP RoHS:否 類別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 時(shí)鐘發(fā)生器，PLL，頻率合成器 系列:PLLatinum™ 標(biāo)準(zhǔn)包裝:39 系列:- 類型:* PLL:帶旁路 輸入:時(shí)鐘 輸出:時(shí)鐘 電路數(shù):1 比率 - 輸入:輸出:1:10 差分 - 輸入:輸出:是/是 頻率 - 最大:170MHz 除法器/乘法器:無/無 電源電壓:2.375 V ~ 3.465 V 工作溫度:0°C ~ 70°C 安裝類型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:* |
| LMX2370SLDX | 功能描述:IC FREQ SYNTH DUAL 24LAMINATECSP RoHS:否 類別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 時(shí)鐘發(fā)生器，PLL，頻率合成器 系列:PLLatinum™ 標(biāo)準(zhǔn)包裝:39 系列:- 類型:* PLL:帶旁路 輸入:時(shí)鐘 輸出:時(shí)鐘 電路數(shù):1 比率 - 輸入:輸出:1:10 差分 - 輸入:輸出:是/是 頻率 - 最大:170MHz 除法器/乘法器:無/無 電源電壓:2.375 V ~ 3.465 V 工作溫度:0°C ~ 70°C 安裝類型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:* |
| LMX2370TM | 功能描述:IC FREQ SYNTH DL 2.5GHZ 20TSSOP RoHS:否 類別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 時(shí)鐘發(fā)生器，PLL，頻率合成器 系列:PLLatinum™ 標(biāo)準(zhǔn)包裝:39 系列:- 類型:* PLL:帶旁路 輸入:時(shí)鐘 輸出:時(shí)鐘 電路數(shù):1 比率 - 輸入:輸出:1:10 差分 - 輸入:輸出:是/是 頻率 - 最大:170MHz 除法器/乘法器:無/無 電源電壓:2.375 V ~ 3.465 V 工作溫度:0°C ~ 70°C 安裝類型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:* |
| LMX2370TMX | 功能描述:IC FREQ SYNTH DL 2.5GHZ 20-TSSOP RoHS:否 類別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 時(shí)鐘發(fā)生器，PLL，頻率合成器 系列:PLLatinum™ 標(biāo)準(zhǔn)包裝:39 系列:- 類型:* PLL:帶旁路 輸入:時(shí)鐘 輸出:時(shí)鐘 電路數(shù):1 比率 - 輸入:輸出:1:10 差分 - 輸入:輸出:是/是 頻率 - 最大:170MHz 除法器/乘法器:無/無 電源電壓:2.375 V ~ 3.465 V 工作溫度:0°C ~ 70°C 安裝類型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:* |
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