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参数资料
| 型号： | LMX1600TM/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 2000 MHz, PDSO16 |
| 封装： | PLASTIC, TSSOP-16 |
| 文件页数： | 2/17页 |
| 文件大小： | 631K |
| 代理商： | LMX1600TM/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
10
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