Sanyo LC72146V Specifications

CMOS IC
Ordering number : ENN4922D
N2001TN (OT)/73096HA (OT)/11095TH (OT) No. 4922-1/22
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
PLL Frequency Synthesizer
LC72146, 72146M, 72146V
Any and all SANYO products described or contained herein do not have specifications that can handle applications that require extremely high levels of reliability, such as life-support systems, aircraft’s control systems, or other applications whose failure can be reasonably expected to result in serious physical and/or material damage. Consult with your SANYO representative nearest you before using any SANYO products described or contained herein in such applications.
SANYO assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all SANYO products described or contained herein.
Overview
The LC72146 is a PLL frequency synthesizer LSI circuit for electronic tuning in car stereo systems. The LC72146 supports the construction of high-performance, multi­functional electronic tuning systems for the VHF MW, and LW bands.
Features
• High-speed programmable dividers for — 10 to 160 MHz on FMIN using pulse swallower — 0.5 to 40.0 MHz on AMIN using pulse swallower
and direct division
• General-purpose counters — HCTR for 0.4 to 25.0 MHz frequency measurement — LCTR for 10 to 500 kHz frequency measurement
and 1.0 Hz to 20 × 103kHz period measurement
• Reference frequencies: Twelve selectable reference frequencies (4.5 or 7.2 MHz crystal) 1, 3, 5, 9, 10,
3.125, 6.25, 12.5, 25, 30, 50 and 100 kHz
• Phase comparator — Insensitive band control — Unlock detection — Sub-charge pump for high-speed locking — Deadlock clear circuit
• CCB input/output data interface
• Power-on reset circuit
• Built-in MOS transistor for a low-pass filter
• Inputs/outputs (using five general-purpose input/output ports) — Maximum of seven inputs (max) — Maximum of seven outputs (max/four n-channel
open-drain and three CMOS outputs)
— Time-base output for clock (8 Hz)
• Operating ranges
— Supply voltage ..................................4.5 to 5.5 V
— Opetating temperature ......................–40 to 85°C
• Package — DIP24S, MFP24S, SSOP24
• CCB is a trademark of SANYO ELECTRIC CO., LTD.
• CCB is SANYO’s original bus format and all the bus addresses are controlled by SANYO.
No. 4922-2/22
LC72146, 72146M, 72146V
Package Dimensions
unit: mm
3067A-DIP24S
unit: mm
3112A-MFP24S
0.48
(3.25)
3.3
3.9max
0.51min
21.0
(0.71)
1.78
0.25
7.62
6.4
1
12
24
13
0.95
0.9
SANYO: DIP24S
[LC72146]
1 12
24
13
12.5
(0.75)
1.0
0.15
0.35
5.4
7.6
0.63
1.7max
1.5
0.1
SANYO: MFP24S
[LC72146M]
unit: mm
3175B-SSOP24
SANYO: SSOP24
[LC72146V]
Specifications
Absolute Maximum Ratings at Ta = 25°C, VSS= 0 V
Allowable Operating Ranges at Ta = –40 to 85°C, VSS= 0 V
No. 4922-3/22
LC72146, 72146M, 72146V
Parameter Symbol Conditions min typ max Unit
Supply voltage
V
DD
1 V
DD
4.5 5.5 V
V
DD
2 VDD: Serial data retain voltage 2.0 V
Input high-level voltage
V
IH
1 CE, CL, DI, I/O-1 to I/O-3 2.2 6.5 V
V
IH
2 I/O-4, I/O-5, HCTR/I-6 and LCTR/I-7 2.2 V
DD
V
Input low-level voltage V
IL
1 CE, CL, DI and I/O-1 to I/O-5, HCTR/I-6, LCTR/I-7 0 0.8 V
Input high-leve lvoltage V
IH
3 LCTR/I-7, Pulse wave
*1
2.2 V
DD
V
Input low-level voltage V
IL
2 LCTR/I-7, Pulse wave
*1
0 0.8 V
Output voltage
V
O
1 DO 0 6.5 V
V
O
2 I/O-1 to I/O-3, AOUT, O-7 0 13 V
f
IN
1 XIN; Sine wave, capacitive coupling 1.0 8.0 MHz
f
IN
2 FMIN; Sine wave, capacitive coupling 10 160 MHz
Input frequency
f
IN
3 AMIN; Sine wave, capacitive coupling 0.5 40 MHz
f
IN
4 HCTR/I-6; Sine wave, capacitive coupling 0.4 25 MHz
f
IN
5 LCTR/I-7; Sine wave, capacitive coupling 10 500 kHz
f
IN
6 LCTR/I-7; Pulse wave, DC coupling
*1
1.0 20 × 10
3
Hz
Guaranteed oscillator
Xtal XIN, XOUT
*2
4.0 8.0 MHz
element frequencies
V
IN
1 XIN 200 1500 mVrms
V
IN
2-1 FMIN; 50 f < 130 MHz
*3
40 1500 mVrms
V
IN
2-2 FMIN; 10 f < 50 MHz*3, 130 f 160 MHz 70 1500 mVrms
V
IN
3-1 AMIN; 2 f < 25 MHz
*3
40 1500 mVrms
V
IN
3-2 AMIN; 25 f < 40 MHz
*3
70 1500 mVrms
V
IN
3-3 AMIN; 0.5 f < 2.5 MHz
*3
40 1500 mVrms
Input amplitude
V
IN
3-4 AMIN; 2.5 f < 10 MHz
*3
70 1500 mVrms
V
IN
4-1 HCTR/I-6; 0.4 f < 25 MHz
*4
40 1500 mVrms
V
IN
4-2 HCTR/I-6; 8 f < 12 MHz
*5
70 1500 mVrms
V
IN
5-1 LCTR/I-7; 10 f < 400 kHz
*4
40 1500 mVrms
V
IN
5-2 LCTR/I-7; 400 f < 500 kHz
*4
20 1500 mVrms
V
IN
5-3 LCTR/I-7; 400 f < 500 kHz
*5
70 1500 mVrms
Data set up time t
SU
DI, CL
*6
0.45 µS
Data hold time t
HD
DI, CL
*6
0.45 µS
Parameter Symbol Conditions Ratings Unit
Maximum supply voltage V
DD
max V
DD
–0.3 to +7.0 V
V
IN
1 max CE, CL, DI –0.3 to +7.0 V
Maximum input voltage V
IN
2 max XIN, FMIN, AIN, AMIN, HCTR/I-6, LCTR/I-7, I/O-4, I/O-5 –0.3 to VDD+ 0.3 V
V
IN
3 max I/O-1 to I/O-3 –0.3 to +15 V
V
O
1 max DO –0.3 to +7.0 V
Maximum output voltage V
O
2 max XOUT, I/O-4, I/O-5, O-6, PD0, PF1, AIN –0.3 to VDD+ 0.3 V
V
O
3 max I/O-1 to I/O-3, AOUT, O-7 –0.3 to +15 V
I
O
1 max I/O-4, I/O-5, O-6, O-7 0 to 3.0 mA
Maximum output current I
O
2 max DO, AOUT 0 to 6.0 mA
I
O
3 max I/O-1 to I/O-3 0 to 10 mA
DIP24S:Ta 85°C 350 mW
Allowable power dissipation Pd max MFP24S:Ta 85°C 220 mW
SSOP24:Ta 85°C 150 mW Operating temperature Topr –40 to +85 °C Storage temperature Tstg –55 to +125 °C
Continued on next page.
Continued from preceding page.
Note: 1. Period measurement
2. Recommended crystal oscillator CI values: CI 120 (For a 4.5 MHz crystal) CI 70 (For a 7.2 MHz crystal)
3. See the description of the structure of the programmable divider.
4. With the CTC bit in the serial data set to 0
5. With the CTC bit in the serial data set to 1
6. See the description of the serial data timing.
Electrical Characteristics at Ta = –40 to +85°C, VSS= 0 V
No. 4922-4/22
LC72146, 72146M, 72146V
Parameter Symbol Conditions min typ max Unit
Clock low-level time t
CL
CL
*5
0.45 µs
Clock high-level time t
CH
CL
*5
0.45 µs
CE wait time t
EL
CE, CL
*5
0.45 µs
CE setup time t
ES
CL, CE
*5
0.45 µs
CE hold time t
EH
CE, CL
*5
0.45 µs
Chip enable to data latch time t
LC
*5
0.45 µs
Data output time t
DC
DO, CL; Depends on pull-up resistor 0.2 µs
Parameter Symbol Conditions min typ max Unit
Rf1 XIN 1.0 M Rf2 FMIN 500 k
Internal feedback resistance Rf3 AMIN 500 k
Rf4 HCTR/I-6 250 k Rf5 LCTR/I-7 250 k
Sub charge pump
R1S AIN 100
internal resistance Hysteresis V
HIS
CE, CL, DI, LCTR/I-7 0.1 V
DD
V
I
O
= 0.5 mA VDD– 0.5 V
Output high-level voltage
V
OH
1 PD0, PD1, I/O-4, I/O-5, O-6 IO= 1 mA VDD– 1.0 V
I
O
= 2 mA VDD– 2.0 V
V
OH
2 AIN: IO= 1 mA VDD– 0.6 VDD– 0.3 V
I
O
= 0.5 mA 0.5 V
V
OL
1
PD0, PD1, I/O-4,
IO= 1 mA 1.0 V
I/O-5, O-6, O-7
I
O
= 2 mA 2.0 V
V
OL
2 AIN: IO= 1 mA 0.3 0.6 V
Output low-level voltage
I
O
= 1 mA 0.2 V
V
OL
3 I/O-1 to I/O-3
I
O
= 2.5 mA 0.5 V
I
O
= 5 mA 1.0 V
I
O
= 9 mA 1.8 V
V
OL
4 DO; IO= 5 mA 1.0 V
V
OL
5 AOUT; IO= 1 mA, AIN = 1.3 V 0.5 V
I
IH
1 CE, CL, DI; VI= 6.5 V 5.0 µA
I
IH
2 I/O-1 to I/O-3; VI= 13 V 5.0 µA
Input high-level current
I
IH
3 I/O-4, I/O-5, HCTR/I-6, LCTR/I-7; VI= V
DD
5.0 µA
I
IH
4 XIN; VI= V
DD
2.0 11 µA
I
IH
5 FMIN, AMIN; VI= V
DD
4.0 22 µA
I
IH
6 HCTR/I-6, LCTR/I-7; VI= V
DD
8.0 44 µA
I
IL
1 CE, CL, DI; VI= 0 V 5.0 µA
I
IL
2 I/O-1 to I/O5; VI= 0 V 5.0 µA
Input low-level current
I
IL
3 HCTR/I-6, LCTR/I-7; VI= 0 V 5.0 µA
I
IL
4 XIN; VI= 0 V 2.0 11 µA
I
IL
5 FMIN, AMIN; VI= 0 V 4.0 22 µA
I
IL
6 HCTR/I-6, LCTR/I-7; VI= 0 V 8.0 44 µA
Continued on next page.
Continued from preceding page.
Pin Assignment
Block Diagram
No. 4922-5/22
LC72146, 72146M, 72146V
Parameter Symbol Conditions min typ max Unit
Output off leakage current
I
OFF
1 I/O-1 to I/O3, AOUT, O-7; VO= 13 V 5.0 µA
I
OFF
2 DO; VO= 6.5 V 5.0 µA
High-level three state
I
OFFH
PD0, PD1, AIN; VO= V
DD
0.01 200 nA
off leakage current Lowh-level three state
I
OFFL
PD0, PD1, AIN; VO= 0 V 0.01 200 nA
off leakage current Input cacitance C
IN
FMIN 6 pF
Pull-down transistor
R
pd
1 FMIN 80 200 600 k
on resistance
R
pd
2 AMIN 80 200 600 k
V
DD
; Xtal = 7.2 MHz, fIN2 = 160 MHz,
I
DD
1 VIN2 = 70 mVrms, fIN4 = 25 MHz 10 15 mA
Supply current
V
IN
4 = 40 mVrms
I
DD
2
V
DD
; PLL inhibited,
0.5 1.5 mA
crystal oscillator running (Xtal = 7.2 MHz)
I
DD
3 VDD;PLL inhibited, crystal oscillator stoped 10 µA
XIN
XOUT
FMIN
V
SS
AMIN
XIN23V
24
SS
AOUT21AIN20PD019PD118V
22
SS
17
FMIN16AMIN15V
DD
HCTR/I-613LCTR/I-7
14
LC72146, 72146M, 72146V
Top View
Top View
1
2CE3DI4CL5DO6
XOUT
24
1
17
18
16
REFERENCE
DIVIDER
SWALLOW COUNTER
12bits PROGRAMMABLE
O-77O-6
1/16, 1/17, 4bits
DIVIDER
8
I/O-59I/O-410I/O-311I/O-212I/O-1
PHASE DETECTOR
CHARGE PUMP
19 20
14
13
PD1
PD0
HCTR/I-6
LCTR/I-7
CE
2
DI
3
CL
4
DO
5
V
15
DD
V
23
SS
CCB
I/F
POWER
ON
RESET
DATA SHIFT REGISTER
LATCH
12 11 10 9 8 7 6
I/O-1 I/O-2 I/O-3 I/O-4 I/O-5 O-6 O-7
UNIVERSAL
COUNTER
AIN
21
AOUT
22
Pin Functions
No. 4922-6/22
LC72146, 72146M, 72146V
Number Symbol Type Function Equivalent circuit
24
1
17
16
2
4
18 23
XIN
XOUT
Xtal OSC
FMIN
Local oscillator
signal input
AMIN
Local oscillator
signal input
CE
Chip enable
CL Clock
DI
Input data
DO Output data
V
DD
Power supply
V
DD
Ground
Connection for crystal oscillator element (7.2 or 4.5 MHz)
• Serial data input: FMIN is selected when DVS is set to 1. Input frequency range: 10 to 160 MHz
• The signal is transmitted directly to the swallow counter
• Divisor value range: 272 to 65535
• Serial data input: AMIN is selected when DVS is set to 0.
• Serial data input: when SNS is set to 1.
• Input frequency range: 2 to 40 MHz
• The signal is transmitted directly to the swallow counter.
• Divisor value range: 272 to 65535
• Serial data input: when SNS is set to 0.
• Input frequency range: 0.5 to 10 MHz
• The signal is transmitted directly to the 12-bit programmable divider.
• Divisor value range: 4 to 4095
12 11 10
I/O-1 I/O-2 I/O-3
General-purpose
I/O port
• General-purpose I/O ports
• Output mode circuit type: open drain
• Function after a power on reset: input port
• Can be set up to function as output ports by bits I/O-1 to I/O-3 in the serial data sent from the controller.
• Inputs the clock used for data synchronization when inputting serial data to the LC72146 DI pin or outputting serial data from the DO pin.
• Input pin for serial data transmitted to the LC72146 from a controller.
• Output pin for serial data transmitted from the LC72146 to a controller.
• The LC72146 power supply connection. A voltage between 4.5 and 5.5 volts must be supplied when the PLL circuit is used.
• The power on reset circuit operates when power is first applied.
Continued on next page.
• The LC72146 ground connection.
3
15
5
S
S
S
• This pin must be set high to input serial data to the LC72146 DI pin or to output serial data from the DO pin.
Continued from preceding page.
Number Symbol Type Function Equivalent circuit
No. 4922-7/22
LC72146, 72146M, 72146V
7 O-6
Output port
• The LC72146 latches the OUT6 bit in the serial data and outputs it from pin O-6.
6 O-7
Output port
• The LC72146 latches the OUT7 bit in the serial data and outputs it from pin O-7.
• Outputs a time base signal (8 Hz) when TBC is set to 1.
• Function after a power on reset: open circuit
9 8
I/O-4 I/O-5
General-purpose
I/O port
• General-purpose I/O ports
• Output mode circuit type: complementary
• Function after a power on reset: input port
• Can be set up to function as output ports by bits I/O-4 and I/O-5 in the serial data sent from the controller.
20 19
PD0 PD1
Charge pump
output
• PLL charge pump output pin If the frequency generated by dividing the local oscillator frequency by N is higher than the reference frequency, a high level will be output from PD0, and if it is lower, a low level will be output. PD0 goes to the high-impedance state when the frequencies match.
• PD1 operates identically.
21 22
AIN
AOUT
Connections for the
low-pass filter
transistor
• Connections to the n-channel MOS transistor used for the PLL active low-pass filter.
• A high-speed locking circuit can be formed by using these pins with the built-in sub charge pump.
• See the item on the structure of the charge pump for details.
Continued on next page.
14 HCTR/I-6
General-purpose
counter
• HCTR is selected when CTS1 is set to 1.
• Input frequency range: 0.4 to 25 MHz
• The signal is passed through a divide-by-two circuit and then input to a general-purpose counter. This input also supports an integrating count function.
• The result is output from the DO output pin starting with the MSB of the general-purpose counter.
• See the item on the structure of the general-purpose counter for details.
• When the H/I-6 bit in the serial data is set to 0:
• This pin functions as an input port, and the value input is output from the DO pin.
No. 4922-8/22
LC72146, 72146M, 72146V
Continued from preceding page.
Number Symbol Type Function Equivalent circuit
13 LCTR/I-7
General-purpose
counter
• LCTR is selected when CTS1 is set to 0.
• If the CTS0 bit in the serial data is set to 1:
• The circuit operates in frequency measurement mode.
• nput frequency range: 10 to 500 kHz
• The signal is directly transmitted to the general-purpose counter without passing through the divide-by-two circuit.
• If the CTS0 bit in the serial data is set to 0:
• The circuit operates in period measurement mode.
• nput frequency range: 1 Hz to 20 kHz
• The measurement period can be set to be either one or two periods of the input signal, and if two period measurement is selected, the input frequency range becomes 2 Hz to 40 kHz.
• The result is output from the DO output pin starting with the MSB of the general-purpose counter.
• See the item on the structure of the general-purpose counter for details.
• When the L/I-7 bit in the serial data is set to 0:
• This pin functions as an input port. The value input is output from the DO pin.
S
Functional Description
Serial Data Input
The LC72146 operating parameters are initialized by two 40-bit data words on the serial data input, DI, as shown in Figure 1 and Figure 2 and Table 1.
Figure 1 Input Data Word IN1
Figure 2 Input Data Word IN2
No. 4922-9/22
LC72146, 72146M, 72146V
Address
First Data In1
DI 0
P0P1P2P3P4P5P6
(1) P-CTR
(2) PD-C
(3) R-CTR
(4) DO-C
(5) Don't
care
(6) U-CTR
P7P8P9
P10
P11
P12
P13
P14
P15
SNS
DVS
PDC0
PDC1R0R1R2R3
DT0
DT1
*
CTE
CTS0
CTS1
GT0
GT1
0 0 1 0 0 1 0
Address
First Data In2
DI 1
*
I/O-1
I/O-2
I/O-3
I/O-4
I/O-5
*
*
TBC
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
OUT7
H/I-6
L/I-7
IL0
IL1
ULD
UL0
UL1XSCTP
CTC
DZ0
DZ1
TEST0
TEST1
TEST2
DLC
0 0 1 0 0 1 0
(7) I/O-C
(14) TIME
(8) O-PORT
(9) U/I-C
(4) DO-C
(10) Unlock
(11) XTAL
(6) U-CTR
(12) DZ-C
(15) TEST
(13) PD-L
(5) Don't
care
(5) Don't
care
Table 1 Input Data Functions
No. 4922-10/22
LC72146, 72146M, 72146V
No. Name Function Related bits
Programmable divider ratio P15 is the MSB. The divider ratio, frequency range and LSB are determined by the setting of the DVS and SNS flags as shown in Table 2 and Table 3. P0 to P3 are ignored if P4 is the LSB.
Table 2 Divider ratio settings
Note: × = don’t care
Table 3 Frequency range settings
Note: × = don’t care Sub-charge pump control
Bits PDC0 and PDC1 control the charge pump state as shown in Table 4. The sub-charge pump is connected to the gate of the low-pass filter transistor. This can be used in conjunction with PD0 and PD1 (main charge pump) to build a fast locking PLL.
Table 4 Charge pump state selection
Note: × = don’t care * See the “Charge Pump” on page 16 for details.
Reference frequency select Bits R0 to R3 disable the PLL or select the reference frequency as shown in Table 5.
Table 5 Reference frequency selection
When the PLL is disabled, the programmable divider is stopped, AMIN and FMIN are pulled to ground, and the charge-pump outputs become high impedance.
DVS SNS LSB Divider ratio (N)
1 × P0 272 to 65535 0 1 P0 272 to 65535 0 0 P4 4 to 4095
DVS SNS Input port Input frequency range (MHz)
1 × FMIN 10 to 160 0 1 AMIN 2 to 40 0 0 AMIN 0.5 to 10
PDC1 PDC0 Charge pump state
0 × High impedance 1 1 Operating (operates continuously) 1 0 Operating (when PLL is unlocked)
R
3
R
2
R
1
R
0
Reference frequency (kHz) 0 0 0 0 100 0 0 0 1 50 0 0 1 0 25 0 0 1 1 25 0 1 0 0 12.5 0 1 0 1 6.25 0 1 1 0 3.125 0 1 1 1 3.125 1 0 0 0 10 1 0 0 1 9 1 0 1 0 5 1 0 1 1 1 1 1 0 0 3 1 1 0 1 30 1 1 1 0 PLL inhibited and crystal oscillator stopped 1 1 1 1 PLL inhibited
P0 to P15, DVS, SNS
(1)
PDC0,
PDC1
(2)
R0 to R3(3)
UL0, UL1, DLC
Continued on next page.
Continued from preceding page.
No. 4922-11/22
LC72146, 72146M, 72146V
No. Name Function Related bits
DO and I/O-5 output control data Bits ULD, DT0, DT1, IL0 and IL1 control the mode of outputs DO and I/O-5 as shown in Table 6 and Table 7.
Table 6 DO and I/O-5 output flag selection
Note: *1. End-UC flags that general-purpose counter operation has finished.
*2.Applicable only if I/O-5 is set to be an output port.
Figure 3 DO output state
Table 7 IN state selection
Note: 1. If I/O-1 or I/O-2 is set to be an output port, IN becomes open.
2. DO does not go low when the crystal oscillator has stopped.
[When reference frequencies are as these: R3 = R2 = R1 = 1; R0 = 0] Don’t care. Counter control
Bits CTS0 and CTS1 select the counter input as shown in Table 8.
Table 8 Counter input and measurement mode selection
Note: × = don’t care Bit CTE starts the counter when 1, and resets the counter, when 0.
Bits GT0 and GT1 select the measurement time in frequency measurement mode or the number of periods to count in period measurement mode as shown in Table 9.
Table 9 Measurement duration selection
When CTE is 0 the input is pulled down, and when CTP is 1 it is not. (Wait time: 1 to 2 ms.) CTP must be set to 1 at least 4 ms before CTE is set to 1. The input sensitivity can be reduced by setting CTC to 1. (Sensitivity: 10 to 30 mV rms)
(4)
ULD, DT0,
DT1, IL0, IL1
(6)
(5)
CTS0,
CTS1, CTE,
GT0, GT1
*
CTP, CTC
OUT5, I/O-1, I/O-2, I/O-5
H/I-6, L/I-7
ULD DT1 DT0 DO I/O-5
0 0 0 Unlock flag 0 0 1 Open
OUT5 flag
*
2
.
0 1 0 End-UC flag
*1
. 0 1 1 IN. See table 7. 1 0 0 Open 1 0 1 Open
Unlock flag
*
2
.
1 1 0 End-UC flag 1 1 1 IN. See table 7.
IL1 IL0 IN state
0 0 Open 0 1 I-1 input 1 0 I-2 input 1 1 DO goes low when I1 changes.
CTS1 CTS0 Input
Measurement
mode 1 × HCTR Frequency 0 1 LCTR Frequency 0 0 LCTR Period
Frequency measurement Period measurement
GT1 GT0 Measurement
Wait time (ms) Cycles
duration (ms)
0 0 4
3 to 4 1
0 1 8 1 0 32
7 to 8 2
1 1 64
Continued on next page.
Start Finish
(I-1 change)
CE : Hi
DO
A02691
Continued from preceding page.
No. 4922-12/22
LC72146, 72146M, 72146V
No. Name Function Related bits
Input/output port control Bits I/O-1 to I/O-5 set the direction of the ports. Each pin is an input when the corresponding bit is 0, and an output, when the bit is 1. All ports are set to be inputs after power-on reset.
Output port data Bits OUT1 to OUT7 set the output values of the O-1 to O-7 output ports. Each output is open or high when the corresponding bit is 1, and low, when the bit is 0. A bit is ignored if the corresponding port is an input port or the unlock output.
Counter input control Bits H/I-6 and L/I-7 select the operation of the HCTR/I-6 and LCTR/I-7 pins. When H/I-6 is 0, HCTR/I-6 is an input port, and when H/I-6 is 1, HCTR/I-6 is the HCTR input. When L/I-7 is 0, LCTR/I-7 is an input port, and when L/I-7 is 1, LCTR/I-7 is the LCTR input.
PLL unlock detect control Bits UL0 and UL1 select the phase error threshold and extension (øE) used to detect the PLL unlocked state as shown in Table 10 and Figure 4. When the phase error is greater than the selected error, the PLL unlock detector output goes low.
Table 10 Unlock detection and extension selection
Figure 4 Phase-error extension
Crystal oscillator control Bit XS selects the oscillator frequency. When XS is 1, the frequency is 7.2 MHz, and when XS is 0,
4.5 MHz.
4.5 MHz is selected after power-on reset. Phase comparator control
Bits DZ0 and DZ1 select the phase comparator insensitive band, or dead zone.
Table 11 Insensitive band mode selection
DZA is selected after power-on reset. Charge pump control
Bit DLC controls the charge pump operation. When DLC is 1, the charge pump outputs are forced to low, and when DLC is 0, the charge pump operates normally. This feature can be useful to remove the PLL from a deadlock state. The PLL can deadlock if its VCO control voltage V
tune
becomes 0 V, halting the VCO. Setting DLC to 1 sets V
tune
to VCC, restarting the VCO.
Normal operating mode is selected after power-on reset. An 8 Hz 40% duty clock time base signal can be output from the O-7 by setting TBC to 1.
When TBC is 1 the OUT7 data will be invalid. TBC is set to 0 by the power-on reset. Test data
Bits TEST0 to TEST2 are used for in-factory device testing. Set them all to 0. They are set to zero after a power-on reset.
(7)
(8)
I/O-1 to
I/O-5
OUT1 to
OUT7
(9) H/I-6, L/I-7
(10) UL0, UL1
(11) XS
(12) DZ0, DZ1
(15)
TEST0 to
TEST2
(14) TBC
(13) DLC
OUT1 to OUT5, ULD
I/O-1 to I/O-5, ULD
CTS0, CTS1
ULD, DT0, DT1
OUT7
UL1 UL0 Phase error Detector output
0 0 Stopped Open 0 1 0 øE output 1 0 ±0.56 µs øE with 1 to 2 ms extension 1 1 ±1.11 µs øE with 1 to 2 ms extension
DZ1 DZ0 Insensitive band (dead zone) mode
0 0 DZA 0 1 DZB 1 0 DZC 1 1 DZD
øE
Expansion
DO
1 to 2 ms
I/O-5
Unlock state output
Serial Data Output
The 40-bit data word output on DO has the format and functions as shown in Figure 5 and Table 12, respectively.
Figure 5 Output Data Word Out
Table 12 Input Data Functions
Serial Data Input/Output Mode Selection
The LC72146 use the CCB (computer control bus) serial data format. The first eight bits form the address, shown in Figure 6, used to select the mode of operation as shown in Table 13.
Table 13 Serial Data Input/Output Mode Selection
No. 4922-13/22
LC72146, 72146M, 72146V
No. Name Function Related bits
Input port data Bits I1 to I7 reflect the data latched into each input port when the device changes to data output mode. I6 and I7 are zero when the corresponding port is a counter input. I1 to I5 correspond to the I/O-1 to I/O-5 ports, and I6 and I7, to the HCTR/I-6 and LCTR/I-7 inputs, respectively.
Counter contents Bits C0 to C19 are the latched contents of the 20-bit binary counter. C19 is the MSB. C0 is the LSB.
(1) I1 to I7
(2) C0 to C19
I/O-1 to I/O-5, H/I-6,
L/I-7
OUT1 to OUT5
CTS0, CTS1, CTE
Input/output mode
Address
Function
B0 B1 B2 B3 A0 A1 A2 A3 IN1 0 0 0 1 0 0 1 0 32-bit control data input IN2 1 0 0 1 0 0 1 0 32-bit control data input
OUT 0 1 0 1 0 0 1 0 Output data. Data is output if the clock is active.
Figure 6 Mode Selection Address Bits
Address
DIDO0
1 0 1 0 0 1 0
First Data OUT
I7I6I5I4I3I2I1
(1) IN-PORT
C19
C18
C17
C16
C15
C14
C13
C12
C9C8C7C6C5C4C3C2C1
C11
C10
(2) U-CTR
C0
: Data 0
CE
CL
DI
DO
B0
B1 B2 B3 A0 A1 A2 A3
I/O mode determined
First Data IN1/2
First Data OUT
1. Serial data input (IN1/IN2)
2. Serial data output (OUT)
Note: 1. The data conversion time varies with the value of the pull-up resistor, since the DO pin is an n-channel open drain circuit.
2. The DO pin is normally open.
Programmable Divider
The configuration of the programmable divider is shown in Figure 7. The input mode selection is shown in Table 14, and the input sensitivity, in Table 15.
Figure 7 Programmable Divider
Table 14 Programmable Divider Selection
Note: × = don’t care
No. 4922-14/22
LC72146, 72146M, 72146V
DVS SNS Divisor setting (NO) Input frequency range Input port
1 × 272 to 65535 10 to 160 MHz FMIN 0 1 272 to 65535 2 to 40 MHz AMIN 0 0 4 to 4095 0.5 to 10 MHz AMIN
t
t
t
t
t
EL
ES
EH
CE
SU
HD
t
0.45 µS
<
LC
CL
t
SU
DI
t
HD
B0 B1 B2 B3 A0 A1 A2 A3 P0 P1 P2 P3 CTS0 CTS1 GT0 GT1
Internal data
t
t
t
t
0.45 µS
>
CL
CH
EL
t
ES
t
CL
t
CH
EH
t
LC
CE
t
t
t
t
t
t
t
SU
HD
EL
t
t
0.2 µS (*1)
<
DC
DH
ES
EH
0.45 µS
>
CL
CH
t
t
EL
ES
t
CL
t
CH
t
EH
CL
DO
t
SU
DI
(*2)
t
HD
B0 B1 B2 B3 A0 A1 A2 A3
t
t
DC
DH
I7 I6 I5 I4 C3 C2 C1 C0
(*2)
12bits4bits
FMIN
AMIN
(A)
Swallow
(B)
Counter
(C)
Programmable
Divider
fvco/N
PD øE
fref
fvco=fref x N
Table 15 Input Sensitivity (Target Sensitivity)
CTC: Input sensitivity switching data. When CTC is 1 the input sensitivity is degraded.However, the actual values will be:
HCTR 30 to 40 mVrms (frequency: 10.7 MHz) LCTR 10 to 15 mVrms (frequency: 450 kHz)
CTP: The input pull-down resistor (when CTE is 0) can be disabled by setting CTP to 1.
CTP must be set to 1 at least 4 ms before CTE is set to 1. CTP should be set to 0 if the counter is not used. When CTP is set to 1 wait time is reduced at 1 to 2 ms.
The LC72146 includes a general-purpose 20-bit binary counter whose value can be read out from the DO pin, MBS first. When using this counter for frequency measurement, one of four measurement times (4, 8, 32, or 64 ms) is selected by GT0 and GT1. The frequency input to either the HCTR or the LCTR pin can be measured by determining the number of pulses input to the counter during the measurement period. This counter can be used to measure the period of the signal input to the LCTR pin by determining how many cycles of a reference signal (900 kHz) are input to the counter during one or two periods of the LCTR pin signal. The counter is started by setting the serial data CTE bit to 1. While serial data is latched in the LC72146 when CE falls from high to low, input to the HCTR or the LCTR pin must be provided within the waiting period that follows CE being set low. Next, after the measurement completes, the value of the counter must be read out during the period that CTE is 1. (The general-purpose counter is reset when CTE is set to 0.) It should be emphasized here that the counter should be reset before measurement by setting CTE to 0. Also note that although the signal input to the LCTR pin is input to the counter directly, the signal input to the HCTR pin is divided by two internally before being input to the counter. Accordingly, the value of the counter will be 1/2 the actual frequency input to the HCTR pin.
Figure 8 General-Purpose Counter
No. 4922-15/22
LC72146, 72146M, 72146V
Minimum input sensitivity (f [MHz])
(A) FMIN
10 f < 50 50 f < 130 130 f < 160
70 mVrms 40 mVrms 70 mVrms
(B) AMIN
2 f < 25 25 f < 40
40 mVrms 70 mVrms
(C) AMIN
0.5 f < 2.5 2.5 f < 10 —
40 mVrms 70 mVrms
HCTR
LCTR
CTC, CTP
GT1,GT0
1 2
One period/two period
extraction circuit
Check signal: 900 kHz
4/8/32/64
ms
Input signal
switching gate
(FIF)
(T)
GT
S1
S2
S3
CTS1 CTS0
L S B
0 to 3 4 to 7 8 to 11 12 to 1516 to 19
C = FIF × GT C = (1/T) ÷ 900kHz
General-purpose counter
(20-bit binary counter)
CTE
M
S B
DO pin
Note: * CTC = 0: 40 mVrms
CTC = 1: 70 mVrms However, the frequency ranges will be as follows when CTC is 1. HCTR: 8 to 12 MHz, LCTR: 400 to 500 kHz
Integrating Count
Note: CTE: 0 • General-purpose counter reset
1
• General-purpose counter start
• Restarts on a new 1 setting In integrated count mode, the count value is accumulated in the general-purpose counter. Care is required to handle counter overflow. Counter values: 0
H
to FFFFFH(1,048,575) To implement the integrating count operation leave CTE set to 1. When the serial data (IN1) is transmitted again, the general-purpose counter will start to measure the input again and the result will be added to the count.
No. 4922-16/22
LC72146, 72146M, 72146V
CTS1 CTS0 Input pin Measurement mode Frequency range Input sensitivity S1 1 HCTR Frequency 0.4 to 25.0 MHz 40 mVrms* S2 0 1 LCTR Frequency 10 to 500 kHz 40 mVrms* S3 0 0 LCTR Period 1.0 to 20 × 10
3
Hz (pulse)
GT1 GT0
Frequency measurement mode
Period measurement
Measurement time (ms) Wait time (ms)
mode
0 0 4
3 to 4 One period
0 1 8 1 0 32
7 to 8 Two periods
1 1 64
CE
Frequency Measurement time
HCTR LCTR
LCTR
Period Measurement time
900 kHz (check signal)
Wait time
Measurement time
Signal input
One period
Note: *
V
DD
V
SS
At least 40 mVrms* (during frequency measurement) CTC = 0 : 40 mVrms CTC = 1 : 70 mVrms
2.2 V (min)
0.8 V (max)
(during period measurement)
However, the frequency ranges will be as follows when CTC is 1. HTCR : 8 to 12 MHz, LCTR : 400 to 500 kHz
CTE = 1 CTE = 1 CTE = 0
CE
Internal data
latch (CTE)
GT
General-purpose counter
end-UC (DO)
Start
Count complete Count complete
Restart Reset
(Integration)
Charge Pump
The charge pump configuration is shown in Figure 9.
Figure 9 Charge Pump
When unlock is detected following a channel change, PDS (the sub-charge pump) operates. The value of R1 changes to R1M // R1S (R1S 100 ), as shown in Figure 10, decreasing the low-pass filter time-constant and accelerating PLL locking.
Figure 10 Charge Pump Connections
No. 4922-17/22
LC72146, 72146M, 72146V
PDC1 PDC0 PDS (sub-charge pump state)
0 High impedance 1 1 Charge pump operates (normal operation) 1 0 Charge pump operates (when unlocked)
DLC PD1, PD0, PDS
0 Normal operation 1 Forced to low
PD1
fvco/N
fref
Clock
UL0 UL1
DLC
Phase
Detector
DZ0 DZ1
Unlock
Detector
and
Subcharge
Pump Cont.
PDC0
(MAIN)
(MAIN)
PDS
Unlock
DO, I/O-5 pinPDC1
(SUB)
R1S = 100 (typ)
PD0
A IN
A OUT
R1S
PDO
PDS
R1M
R1S
V
CC
Vtune
The unlock detection data UL1 must be set to 1. The unlock detection range will be set to ±0.56 µs or ±1.11 µs. If a phase difference in excess of these values is detected the circuit will go to the unlock state and the sub-charge pump will operate. When the circuit approaches the lock state and the phase difference falls under the unlock detection range, the sub-charge pump operation will stop, i.e., the sub-charge pump will go to the high impedance state.
Note: 1. Notes on the phase comparator dead zone
Cases where the charge pump is in the ON/ON state require special care during system design since the charge pump outputs correction pulses even when the PLL is locked and it is easy for the loop to become unstable. The following problems may occur in the ON/ON state.
Sidebands may be generated by reference frequency leakage.Sidebands may be generated by low frequency leakage due to the correction pulse envelope.
The settings that have a dead zone (the OFF/OFF settings) provide good loop stability, but it is hard to achieve a good S/N ratio with these settings. Inversely, the settings with no dead zone (the ON/ON settings) allow a high S/N ratio to be achieved but it is hard to achieve good loop stability with these settings. Therefore, it can be effective to select either the DZA or DXB setting, i.e., a setting which has no dead zone, when an S/N ratio of between 90 and 100 dB or higher is required in FM mode, or when the AM stereo pilot margin needs to be increased. However, in cases where such a high FM S/N ratio is not required and where an adequate AM stereo pilot margin can be achieved or AM stereo is not used, either the DZC or DZD setting, i.e., a setting which has a dead zone, should be selected.
Dead Zone Definition The phase comparator compares fp with a reference frequency (fr) as shown in Figure 11. Figure 12 shows the characteristics of an ideal phase comparator, which outputs an output voltage (A) that is proportional to the phase difference ø. However, in an actual IC, a region (dead zone) in which minute phase differences cannot be detected occurs due to internal circuit delays and other factors. To implement an end product with a high S/N ration, the dead zone should be as small as possible. However, there are cases where a larger dead zone can make a popularly-priced model easier to use. This is because it is possible for RF leakage from the mixer to the VCO to modulate the VCO in popularly-priced models when a strong RF input is applied. When the dead zone is small an output that compensates for this problem is generated, and this output may itself modulate the VCO and generate beating with the RF frequency.
No. 4922-18/22
LC72146, 72146M, 72146V
DZ1 DZ0 Dead zone mode Charge pump Dead zone
0 0 DZA ON/ON – –0 s 0 1 DZB ON/ON –0 s 1 0 DZC OFF/OFF +0 s 1 1 DZD OFF/OFF + +0 s
Figure 11 Figure 12
2. FMIN, AMIN, HCTR and LCTR These inputs should each be capacitively coupled using a 50 to 100 pF capacitor. Also, these capacitors should be mounted as close as possible to their respective inputs.
3. IF counting using HCTR or LCTR The LC72146 can perform IF count tuning when connected to an SD (station detector) signal from an IF IC. IF counting should start when the SD signal becomes active. Note on IF counting: The SD (station detect) signal must be used in conjunction with IF counting. When using the general-purpose counter for IF counting, be sure to determine whether or not there is an SD signal from the IF IC. The IF counter buffer should be turned on and IF counting performed only if there is an SD signal. Autosearch techniques that use only the IF counter are not recommended, since it is possible for IF buffer leakage output to cause incorrect stops at points where there is no station.
4. Using the DO pin In modes other than data output mode, the DO pin is also used for counter completion, unlock detection, and for checking for changes in the input pin. (In these cases the DO pin will change from the high to the low level.) The state of the input pin can be input to the controller directly through the DO pin.
5. Power supply pins Capacitors must be inserted between the power supply VDDand VSSpins for noise exclusion. These capacitors must be placed as close as possible to the VDDand VSSpins.
6. VCO setup Applications must be designed so that the VCO (local oscillator) does not stop, even if the control voltage (Vtune) goes to 0 V. If it is possible for the oscillator to stop, the application must be use the control data (DLC) to temporarily force Vtune to VCCto prevent deadlock from occuring. (Deadlock clear circuit)
Pin States at Power On and Reset
No. 4922-19/22
LC72146, 72146M, 72146V
Reference Divider
Phase
Detector
Programmable Divider
fr
LPF VCO
MIX
V
(A)
(B)
ø (ns)
Dead Zone
Leakage
RF
fp
XOUT
CE
DI
CL
DO O–7 O–6
I/O–5 I/O–4 I/O–3 I/O–2 I/O–1
O–7 O–6
I–5 I–4 I–3 I–2 I–1
O L F F F F F
O: Open L: Low F: Floating
I–6 I–7
F F
XIN V
SS
AOUT AIN PD0 PD1 V
SS
FMIN AMIN V
DD
HCTR/I–6 HCTR/I–7
State
Power On
Reset
LC72146, 72146M, 72146V
State
Power On
Reset
Application System Example
Note on Clock Time Base Usage
A resistor of at least 100 kmust be used as the clock time base output pin (O-7) pull-up resistor. Also, the use of a Schmitt circuit is recommended in the controller (microprocessor) input circuit to prevent chattering. Forming a loop filter with the built-in low-pass filter transistor will also serve to prevent degradation of the VCO C/N characteristics. Since the grounding points for the clock time base output pin and the low-pass filter transistor are a common point within the IC, current fluctuations in the clock time base output pin must be kept to a minimum to limit influencing the low-pass filter.
No. 4922-20/22
LC72146, 72146M, 72146V
XOUT
CE
DI
CL
DO O–7 O–6
I/O–5 I/O–4 I/O–3 I/O–2 I/O–1
CE
DI
CL
DO
(TB)
XIN V
SS
AOUT AIN PD0 PD1 V
SS
FMIN AMIN V
DD
HCTR/I
6
HCTR/I
7
SO
end-UC
Unlock ST/MON
SD
SI
FMV
CC
AMV
CC
IF ST/MON SD
STRQ
IF ST/MON SD STRQ
FM V
CC
AM V
CC
FMVCO
AMVCO
µ – com
LC72146, 72146M, 72146V
Time base output
Schmitt input
Microprocessor
Loop filter
V
DO
V
CC
Vt
LC72146
Rt 100k
S
No. 4922-21/22
LC72146, 72146M, 72146V
Serial Data Timing
t
SUtHD
t
EL
t
ES
t
EH
t
CH
t
CL
V
IH
V
IH
V
IH
V
IH
CL
CE
DI
V
IL
V
IL
V
IH
V
IL
V
IH
V
IL
V
IL
Old
Internal data latch
t
LC
New
CL
CE
DI
DO
Internal data latch
t
EL
t
ES
t
EH
t
DH
t
DC
V
IH
V
IH
V
IH
V
IL
V
IL
Old
t
LC
New
t
SUtHD
t
CL
t
CH
V
IH
V
IL
V
IH
V
IL
V
IH
V
IL
When CL is stopped at the low level
When CL is stopped at the high level
PS No. 4922-22/22
LC72146, 72146M, 72146V
This catalog provides information as of November, 2001. Specifications and information herein are subject to change without notice.
Specifications of any and all SANYO products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer’s products or equipment. To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer’s products or equipment.
SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, any and all semiconductor products fail with some probability. It is possible that these probabilistic failures could give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire, or that could cause damage to other property. When designing equipment, adopt safety measures so that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective circuits and error prevention circuits for safe design, redundant design, and structural design.
In the event that any or all SANYO products (including technical data, services) described or contained herein are controlled under any of applicable local export control laws and regulations, such products must not be exported without obtaining the export license from the authorities concerned in accordance with the above law.
No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, or any information storage or retrieval system, or otherwise, without the prior written permission of SANYO Electric Co., Ltd.
Any and all information described or contained herein are subject to change without notice due to product/technology improvement, etc. When designing equipment, refer to the “Delivery Specification” for the SANYO product that you intend to use.
Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties.
Loading...