LC72121 View Datasheet(PDF) - SANYO -> Panasonic
Part Name
Description
View to exact match
LC72121 Datasheet PDF : 23 Pages
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LC72121, 72121M, 72121V
DI Control Data
No. Control block/data
Function
• Specifies the divisor for the programmable divider.
This is a binary value in which P15 is the MSB. The LSB changes depending on DVS and SNS.
(* : don’t care)
DVS
SNS
LSB Set divisor (N)
Actual divisor
1
*
P0
272 to 65535 Twice the set value
0
1
P0
272 to 65535
The set value
Programmable
divider data
0
0
P4
4 to 4095
* LSB: When P4 is the LSB, P0 to P3 are ignored.
The set value
1
P0 to P15
DVS, SNS
• These pins select the signal input to the programmable divider (FMIN or AMIN) and switch the input
frequency range.
DVS
1
0
0
SNS
*
1
0
(* : don’t care)
Input pin Frequency range accepted by the input pin
FMIN
10 to 160 MHz
AMIN
2 to 40 MHz
AMIN
0.5 to 10 MHz
* See the “Structure of the Programmable Divider” section for details.
Related data
• Reference frequency selection
Reference divider
data
2
R0 to R3
XS
R3 R2 R1 R0
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
Reference frequency
100 kHz
50
25
25
12.5
6.25
3.125
3.125
10
9
5
1
3
15
PLL INHIBIT + Xtal OSC STOP
PLL INHIBIT
* PLL INHIBIT mode
In this mode, the programmable divider and the IF counter block are stopped, the FMIN, AMIN, and IFIN
pins are pulled down to ground, and the charge pump output goes to the high-impedance state.
• Crystal oscillator element selection data
XS = 0: 4.5 MHz
XS = 1: 7.2 MHz
Note that 7.2 MHz is selected after a power on reset.
• IF counter measurement start command data
CTE = 1: Starts the counter
CTE = 0: Resets the counter
• Determines the IF counter measurement time.
IF counter control
data
3
CTE
GT1
GT0 Measurement time
Wait time
0
0
4 ms
3 to 4 ms
GT0, GT1
0
1
8
3 to 4
1
0
32
7 to 8
1
1
64
7 to 8
* See the “Structure of the IF Counter” section for details.
IFS
Continued on next page.
No. 5815-9/23
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