lc72136nm Sanyo Semiconductor Corporation, lc72136nm Datasheet - Page 15

• Manufacturer Part Number: lc72136nm
• Description: Pll Frequency Systhesizer
• Manufacturer: Sanyo Semiconductor Corporation

Programmable Divider Structure
Note: * Don’t care.
Sample Programmable Divider Divisor Calculations
1. For a 50 kHz FM step size (DVS = 1, SNS = *: FMIN selected)
2. For a 5 kHz SW step size (DVS = 0, SNS = 1: AMIN high-speed side selected)
3. For a 9 kHz MW step size (DVS = 0, SNS = 0: AMIN low-speed side selected)
A
B
C
• FM RF = 90.0 MHz (IF = +10.7 MHz)
• SW RF = 21.75 MHz (IF = +450 kHz)
• MW RF = 1008 kHz (IF = +450 kHz)
FM VCO = 100.7 MHz
PLL fref = 25 kHz (R0 to R1 = 1, R2 to R3 = 0)
100.7 MHz (FM VCO) 25 kHz (fref) 2 (FMIN: divide-by-two prescaler) = 2014
SW VCO = 22.20 MHz
PLL fref = 5 kHz (R0 = R2 = 0, R1 = R3 = 1)
22.2 MHz (SW VCO) 5 kHz (fref) = 4440
MW VCO = 1458 kHz
PLL fref = 3 kHz (R0 to R1 = 0, R2 to R3 = 1): using a 3 kHz reference frequency
1458 kHz (MW VCO) 3 kHz (fref) = 486
DVS
1
0
0
SNS
1
0
*
Input pin
FMIN
AMIN
AMIN
LC72136N, 72136NM
272 to 65535
272 to 65535
Set divisor
1E6 (HEX)
1158 (HEX)
4 to 4095
Twice the set value
The set value
The set value
Actual divisor: N
07DE (HEX)
Input frequency range (MHz)
10 to 160
0.5 to 10
2 to 40
No. 5608-15/23