參數(shù)資料
型號(hào)： LMX2364TMX
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： XO, clock
英文描述： 2.6 GHz PLLatinum Fractional RF Frequency Synthesizer with 850 MHz Integer IF Frequency Synthesizer
中文描述： PLL FREQUENCY SYNTHESIZER, 2600 MHz, PDSO24
封裝： TSSOP-24
文件頁數(shù)： 28/39頁
文件大?。?/td> 694K
代理商： LMX2364TMX
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
9
8
7
6
5
4
3
2
1
0
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
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
[RF_OM = 0]
Fractional Mode
RF_OM = 1
0
128
128
1
1
Not Supported (Use Integer Mode Instead)
…
…
Not Supported ( Use a higher value )
32
32
32
33
33
33
34
34
34
…
…
…
127
127
127
Value
Fractional Mode
(RF_OM=1)
RF_R
RF_N x RF_FN/RF_FD
Integer Mode
(RF_OM=0)
RF_R x RF_FD
RF_N x RF_FD + RF_FN
R Divider Value
Complete N Divider Value
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
1
1
…
…
511
511
L
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參數(shù)描述
LMX2364TMX/NOPB 功能描述:IC FREQ SYNTH 2.6GHZ 24-TSSOP RoHS:是 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:*
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:*
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