參數(shù)資料
型號(hào)： LMX1601TM/NOPB
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類(lèi)： PLL合成/DDS/VCOs
英文描述： PLL FREQUENCY SYNTHESIZER, 1100 MHz, PDSO16
封裝： LEAD FREE, PLASTIC, TSSOP-16
文件頁(yè)數(shù)： 2/17頁(yè)
文件大?。?/td> 631K
代理商： LMX1601TM/NOPB
2.0 Programming Description (Continued)
2.3.6
Programmable Counter Divide Ratio (Main B COUNTER)
2 GHz option (11 bit)
MAIN_B_CNTR
Divide Ratio
10
987654321
0
3
0000000001
1
4
0000000010
0
2,047
1111111111
1
Note 13: Divide ratio: 3 to 2,047 (Divide ratios less than 3 are prohibited)
MAIN_B_CNTR
≥ MAIN_A_CNTR.
See section 2.3.7 for calculation of VCO output frequency.
1.1 GHz option (12 bit)
MAIN_B_CNTR
Divide Ratio
11
10
987654321
0
3
00000000001
1
4
00000000010
0
4,095
11111111111
1
Note 14: Divide ratio: 3 to 4,095 (Divide ratios less than 3 are prohibited)
MAIN_B_CNTR
≥ MAIN_A_CNTR.
See section 2.3.7 for calculation of VCO output frequency.
2.3.7
Pulse Swallow Function
The N divider counts such that it divides the VCO RF frequency by (P+1) for A times, and then divides by P for (B – A ) times.
The B value (B_CNTR) must be
≥ 3. The continuous divider range for the Main PLL N divider is from 992 to 65,535 for 2 GHz
option, from 240 to 65,535 for 1.1 GHz option, and from 56 to 32,767 for 500 MHz option. Divider ratios less than the minimum
value are achievable as long as the binary counter value is greater than or equal to the swallow counter value (B_CNTR
≥
A_CNTR).
f
VCO =Nx(fOSC /R)
N=(P x B) + A
f
VCO: Output frequency of external voltage controlled oscillator (VCO)
f
OSC: Output frequency of the external reference frequency oscillator (input to OSCIN).
R:
Preset divide ratio of binary programmable reference counter (R_CNTR)
N:
Preset divide ratio of main programmable integer N counter (N_CNTR)
B:
Preset divide ratio of binary programmable B counter (B_CNTR)
A:
Preset value of binary 4-bit swallow A counter (A _CNTR)
P:
Preset modulus of dual modulus prescaler (P = 32 for 2 GHz option, P=16 for 1.1 GHz option, and P=8 for 500 MHz
option)
LMX1600/LMX1601/LMX1602
www.national.com
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LMX1601TMX 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:LMX1600 2.0 GHz/500 MHz, LMX1601 1.1 GHz/500 MHz, LMX1602 1.1 GHz/1.1 GHz PLLatinuma?￠ Low Cost Dual Frequency Synthesizer
LMX1601TMX/NOPB 功能描述:IC FREQ SYNTHESIZER DUAL 16TSSOP RoHS:是 類(lèi)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(lèi)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(wú)/無(wú) 電源電壓:2.375 V ~ 3.465 V 工作溫度:0°C ~ 70°C 安裝類(lèi)型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:*
LMX1602 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:PLLatinum⑩ Low Cost Dual Frequency Synthesizer
LMX1602SLB 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:PLLatinum⑩ Low Cost Dual Frequency Synthesizer
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