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參數(shù)資料
| 型號： | 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)： | 24/39頁 |
| 文件大?。?/td> | 694K |
| 代理商： | LMX2364TMX/NOPB |
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Programming Description (Continued)
2.7 R4 REGISTER
This register is used to setup the N divider for the RF Synthesizer. A single word write to this register is all that is required to power
up and tune the RF synthesizer to the desired frequency.
Reg
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9876543210
DATA[20:0]
C2
C1
C0
R4
RF_
PD
RF_N[12:0]
RF_FN[6:0]
1
0
2.7.1 RF_FN — Fractional Numerator, RF Synthesizer
In the case that the PLL is operating in fractional mode (RF_OM=1), RF_FN[6:0] specifies the fractional numerator of the
complete N counter value of the RF PLL. In the case that the PLL is operating in integer mode (RF_OM=0), RF_FN adds to the
total value of the N counter.
Operating Mode
RF N Divider Value Calculation
Fractional Mode (RF_OM=1)
RF_N +RF_FN/RF_FD
Integer Mode (RF_OM=0)
RF_N x RF_FD + RF_FN
2.7.2 RF_N[12:0] — N Divider Ratio, RF Synthesizer
RF_N[12:0] specifies an integer value that is used in calculating the N divider ratio for the RF synthesizer. In the case the part is
operating in fractional mode, it value is the N divider ratio. In the case the part is operating in integer mode, this number is used
in conjunction with the RF_FD and RF_FN values to calculate the N divider value. The range of values supported is dependant
on the selected prescaler. When the 8/9/12/13 prescaler is selected, RF_N value can range from 40 to 4095. When the
16/17/20/21 prescaler is selected, the RF_N value can range from 80 to 8191. The following tables describe how to program a
specific value of RF_N for a given prescaler.
The RF_N value is actually created using a prescaler, C counter, B counter, and an A counter. If RF_P = 16, then the RF_N[12:0]
word is just the binary representation of the desired value. If RF_P = 8, then the case is similiar, except that the third LSB is
disregarded in all calculations. The relationship between RF_N, RF_P, RF_A, RF_B, and RF_C is shown below.
RF_N = RF_PxRF_C +4xRF_B + RF_A
RF_N[12:0] Programming with RF_P = 16
RF_N[12:0]
12
11
10
987654
3
2
1
0
RF_C[8:0]
RF_B [1:0]
RF_A[1:0]
0–47
Values from 0–47 are not allowed.
Some of these N values are allowed, others are illegal divide ratios and not allowed.
48–79
Legal Divide Ratios in Fractional Mode:
48–49, 52–53, 64–66, 68–70, 72–74, 76–78
Legal Divide Ratios in Integer Mode:
All these values are legal in integer mode.
80
0
000101
0
81
0
000101
0
1
…
8191
1
111111
1
RF_N[12:0] Programming with RF_P = 8
RF_N[12:0]
12
11
10
987654
3
2
1
0
RF_C[8:0]
RF_B[1:0]
RF_A[1:0]
0–23
Values from 0–23 are not allowed.
Some of these N values are allowed, others are illegal divide ratios and not allowed.
24–39
Legal Divide Ratios in Fractional Mode:
24–25, 28–29, 32–34, 36–38
Legal Divide Ratios in Integer Mode:
All these values are legal in integer mode.
40
0
000011
X
0
41
0
000011
X
0
1
…
4095
1
111111
X
1
LMX2364
www.national.com
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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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