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Ordering number : ENN6974A
CMOS IC
LC72148V
Electronic Tuning PLL Frequency Synthesizer for Car Stereo Systems
Overview
The LC72148V is a 3 V version of the LC72146 PLL frequency synthesizer that can easily implement a variety of 3 V power supply tuners, including in-car navigation system receivers based on the VICS FM multiplex system.
Functions
* High-speed programmable divider -- FMIN: 10 to 180 MHz ... Pulse swallower technique -- AMIN: 2 to 40 MHz ... Pulse swallower technique 0.5 to 10 MHz ... Direct division technique * IF counters -- HCTR: 0.4 to 25 MHz ... Frequency measurement -- LCTR: 10 to 500 kHz ... Frequency measurement 1.0 to 20 x 103 Hz ... Period measurement * Reference frequency -- One of 12 reference frequencies can be selected (Crystal resonator: 7.2 or 4.5 MHz) 1, 3, 5, 9, 10, 3.125, 6.25, 12.5, 25, 30, 50, and 100 kHz * Phase comparator -- Provides dead zone control -- Built-in unlock detection circuit -- Built-in deadlock clear circuit -- Sub-charge pump for high-speed locking * Built-in MOS transistor for implementing an active lowpass filter
* I/O ports: Five general-purpose I/O ports. -- Input: 7 pins (maximum) -- Output: 7 pins (maximum. N-channel: 4 pins, CMOS: 3 pins) -- A clock time base signal (8 Hz) can be output. * Serial data I/O -- Supports communication with a controller in the CCB format. -- Uses the same serial data as the LC72146. * Operating ranges -- Supply voltage: 2.7 to 3.6 V -- Operating temperature: -40 to +85C * Package -- SSOP24
Package Dimensions
unit: mm 3175B-SSOP24
[LC72148V]
7.8 24
5.6
1 1.5max (0.33) 0.65 0.22 (1.3)
0.15
0.1
SANYO: 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.
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.
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
41202RM (OT)/70601RM (OT) No. 6974-
0.5
7.6
LC72148V Pin Assignment
HCTR/I-6 14 11 I/O-2 LCTR/I-7 13 12 I/O-1
AOUT
AMIN 16 9 I/O-4
FMIN
VSSa
VSSd
PD0
PD1
24
23
22
21
20
19
18
17
15
1 XOUT
2 CE
3 DI
4 CL
5 DO
6 O-7
7 O-6
8 I/O-5
10 I/O-3
Block Diagram
VDD
XIN
AIN
19 PD1 XIN 24 XOUT 1 Reference divider Phase detector charge pump 20 PD0
FMIN 17
Swallow counter 1/16, 1/17 4 bits
14 HCTR/I-6
AMIN 16
12 bits programmable divider
13 LCTR/I-7
CE 2 DI 3 CL 4 DO 5 VDD 15 VSSd 18 12 I/O-1 11 I/O-2 10 I/O-3 9 I/O-4 8 I/O-5 7 O-6 6 O-7 Power on reset CCB I/F
Universal counter Data shift register latch 21 AIN 22 AOUT 23 VSSa
No. 6974-2/21
LC72148V
Specifications
Absolute Maximum Ratings at Ta = 25C, Vssd = Vssa = 0 V
Parameter Supply voltage Symbol VDD max VIN1 max Maximum input voltage VIN2 max VIN3 max VO1 max Maximum output voltage VO2 max VO3 max IO1 max Maximum output current IO2 max IO3 max Allowable power dissipation Operating temperature Storage temperature Pd max Topr Tstg VDD CE, CL, DI XIN, FMIN, AMIN, HCTR/I-6, LCTR/I-7, AIN, I/O-4, I/O-5 I/O-1, I/O-2, I/O-3 DO XOUT, I/O-4, I/O-5, O-6, PD0, PD1, AIN I/O-1, I/O-2, I/O-3, AOUT, O-7 I/O-4, I/O-5, O-6, O-7 DO, AOUT I/O-1, I/O-2, I/O-3 (Ta 85C) SSOP24 Conditions Ratings -0.3 to +7.0 -0.3 to +7.0 -0.3 to VDD + 0.3 -0.3 to +15.0 -0.3 to +7.0 -0.3 to VDD + 0.3 -0.3 to +15.0 0 to 3.0 0 to 6.0 0 to 10 140 -40 to +85 -55 to +125 Unit V V V V V V V mA mA mA mW C C
Allowable Operating Conditions at Ta = 25C, Vssd = Vssa = 0 V
Parameter Symbol VDD1 VDD2 VIH1 High-level input voltage VIH2 VIH3 Low-level input voltage VIL1 VIL2 Output voltage VO1 VO2 fIN1 fIN2 fIN3 Input frequency fIN4 fIN5 fIN6 fIN7 VIN1 VIN2-1 VIN2-2 VIN3 Input amplitude VIN4 VIN5-1 VIN5-2 VIN6-1 VIN6-2 VIN6-3 Guaranteed operation range for crystal resonator Notes: X'tal VDD VDD: Serial data retained CE, CL, DI, I/O-1, I/O-2, I/O-3 I/O-4, I/O-5, HCTR/I-6, LCTR/I-7 LCTR/I-7: Pulse waveform CE, CL, DI, I/O-1 to I/O-5, HCTR/I-6, LCTR/I-7 LCTR/I-7: Pulse waveform DO I/O-1, I/O-2, I/O-3, O-7, AOUT XIN: VIN1 *1 FMIN: VIN2 *1 AMIN (SNS = 1): VIN3 *1 AMIN (SNS = 0): VIN4 *1 HCTR/I-6: VIN5 *1 LCTR/I-7: VIN6 *1 LCTR/I-7 *2 XIN: fIN1 FMIN: f = 10 to 130 MHz FMIN: f = 130 to 180 MHz AMIN (SNS = 1): fIN3 AMIN (SNS = 0): fIN4 HCTR/I-3 (CTC = 0): f = 0.4 to 25 MHz HCTR/I-3 (CTC = 1): f = 8 to 12 MHz LCTR/I-4 (CTC = 0): f = 10 to 400 kHz LCTR/I-4 (CTC = 0): f = 400 to 500 kHz LCTR/I-4 (CTC = 1): f = 400 to 500 kHz XIN, XOUT *3 Conditions Ratings min 2.7 1.5 0.7 VDD 0.7 VDD 0.7 VDD 0 0 0 0 1 10 2 0.5 0.4 10 1.0 200 20 40 40 40 40 70 40 20 70 4.0 6.5 VDD VDD 0.3 VDD 0.3 VDD 6.5 13 8 180 40 10 25 500 20 x 103 900 900 900 900 900 900 900 900 900 900 8.0 typ max 3.6 Unit V V V V V V V V V MHz MHz MHz MHz MHz kHz Hz mVrms mVrms mVrms mVrms mVrms mVrms mVrms mVrms mVrms mVrms MHz
Supply voltage
1. Sine wave, capacitance coupling 2. Pulse waveform, DC coupling (period measurement) 3. Recommended CI values for the crystal resonator: CI 120 (4.5 MHz) or CI 70 (7.2 MHz)
No. 6974-3/21
LC72148V Electrical Characteristics for the Allowable Operating Ranges
Parameter Symbol Rf1 Rf2 Internal feedback resistors Rf3 Rf4 Rf5 Internal pull-down resistors Hysteresis Rpd1 Rpd2 VHIS VOH1 VOH2 VOL1 VOL2 Low-level output voltage XIN FMIN AMIN HCTR/I-6 LCTR/I-7 FMIN AMIN CE, CL, DI, LCTR/I-7 PD0, PD1, I/O-4, I/O-5, O-6, IO = -0.5 mA PD0, PD1, I/O-4, I/O-5, O-6, IO = -1 mA AIN, IO = -5 mA PD0, PD1, I/O-4, I/O-5, O-6, O-7, IO = 0.5 mA PD0, PD1, I/O-4, I/O-5, O-6, O-7, IO = 1.0 mA AIN, IO = 5 mA I/O-1, I/O-2, I/O-3, IO = 1 mA VOL3 I/O-1, I/O-2, I/O-3, IO = 2.5 mA I/O-1, I/O-2, I/O-3, IO = 5 mA I/O-1, I/O-2, I/O-3, IO = 9 mA VOL4 VOL5 IIH1 IIH2 High-level input current IIH3 IIH4 IIH5 IIH6 IIL1 IIL2 Low-level input current IIL3 IIL4 IIL5 IIL6 Output off leakage current High-level three-state off leakage current Low-level three-state off leakage current Input capacitance IOFF1 IOFF2 IOFFH IOFFL CIN IDD1 Supply current IDD2 DO, IO = 5 mA AOUT, IO = 10 mA, AIN = 2.0 V CE, CL, DI, VI = 6.5 V I/O-1, I/O-2, I/O-3, VI = 13 V I/O-4, I/O-5, HCTR/I-6, LCTR/I-7, VI = VDD XIN, VI = VDD FMIN, AMIN, VI = VDD HCTR/I-6, LCTR/I-7, VI = VDD CE, CL, DI, VI = 0 V I/O-1, I/O-2, I/O-3, VI = 0 V HCTR/I-6, LCTR/I-7, VI = 0 V XIN, VI = 0 V FMIN, AMIN, VI = 0 V HCTR/I-6, LCTR/I-7, VI = 0 V I/O-1, I/O-2, I/O-3, O-7, AOUT, VO = 13 V DO, VO = 6.5 V PD0, PD1, AIN, VO = VDD PD0, PD1, AIN, VO = 0 V FMIN VDD, X'tal = 7.2 MHz, fIN2 = 180 MHz, VIN2 = 40 mVrms, fIN5 = 25 MHz, VIN5 = 40 mVrms VDD, With the PLL block stopped. (PLL INHIBIT) With the crystal oscillator operating. (Crystal frequency = 7.2 MHz) VDD, With the PLL block stopped. With the crystal oscillator stopped. 0.01 0.01 6 3 8 1.3 2.5 5.0 1.3 2.5 5.0 VDD - 0.5 VDD - 1.0 VDD - 1.0 0.5 1.0 1.0 0.2 0.5 1.0 1.8 1.0 1.5 5.0 5.0 5.0 8 15 30 5.0 5.0 5.0 8 15 30 5.0 5.0 200 200 80 80 Conditions Ratings min typ 1 500 500 250 250 200 200 0.1 VDD 600 600 max Unit M k k k k k k V V V V V V V V V V V V V A A A A A A A A A A A A A A nA nA pF mA
High-level output voltage
0.5
1.5
mA
IDD3
10
A
No. 6974-4/21
LC72148V Pin Functions
Pin No. 24 1 Symbol XIN XOUT Type Function Pin circuit
X'tal
* Crystal resonator connections (7.2 or 4.5 MHz)
* FMIN is selected when DVS in the serial data input is set to 1. 17 FMIN Local oscillator signal input * The input frequency range is 10 to 180 MHz. * The signal is directly transmitted to the swallow counter. * The divisor can be set to a value in the range 272 to 65,535.
* AMIN is selected when DVS in the serial data input is set to 0. * When SNS in the serial data input is set to 1: --The input frequency range is 2 to 40 MHz. --The signal is directly transmitted to the swallow counter. 16 AMIN Local oscillator signal input --The divisor can be set to a value in the range 272 to 65,535. * When SNS in the serial data input is set to 0: --The input frequency range is 0.5 to 10 MHz. --The signal is directly transmitted to the 12-bit programmable divider. --The divisor can be set to a value in the range 5 to 4,095. * This pin must be set to the high level during serial data input (DI) from, or serial data output (DO) to, the LC72148V. * Input pin for serial data transmitted from the controller to the LC72148V. * Data synchronization clock used during serial data input (DI) from, or serial data output (DO) to, the LC72148V. * Data output pin for data output from the LC72148V to the controller. 5 DO Output data The content of the data output is determined by the ULD, DT0, and DT1 bits in the serial data. * The LC72148V power supply pin. (VDD = 2.7 to 3.6 V) * The power-on reset circuit operates when power is first applied. * Digital system ground for the LC72148V ------
2
CE
Chip enable
S
3
DI
Input data
S
4
CL
Clock
S
15
VDD
Power supply
18
VSSd
Ground
------
21 22 23
AIN AOUT VSSa Low-pass filter amplifier transistor
* Connections to the internal n-channel MOS transistor provided to implement an active low-pass filter for the PLL. * A high-speed locking circuit can be implemented by using these pins in conjunction with the built-in sub-charge pump. * See the item describing the structure of the charge pump for details. * Vssa is a dedicated ground pin. * Input/output shared-function pins * In output mode, the circuits are open-drain outputs. * The I/O direction is determined by I/O-1 to I/O-3 in the serial data. When the data is 0: input port When 1: output port
12 11 10
I/O-1 I/O-2 I/O-3 General-purpose I/O ports
* When specified for use as input ports The input pin states are transmitted from the DO pin to the controller Input state = low : Data = 0 Input state = high : Data = 1 * When specified for use as output ports The output states are determined by OUT1 to OUT3 in the serial data. Data = 0 : low Data = 1 : open * These pins are set to function as input ports by the power-on reset.
Continued on next page. No. 6974-5/21
LC72148V
Continued from preceding page.
Pin No. Symbol Type Function * Input/output shared-function pins * In output mode, the circuits are complementary outputs. * The I/O direction is determined by I/O-4 and I/O-5 in the serial data. When the data is 0: input port When 1: output port * When specified for use as input ports The input pin states are transmitted from the DO pin to the controller Input state = low : Data = 0 Input state = high : Data = 1 * When specified for use as output ports The output states are determined by OUT4 and OUT5 in the serial data. Data = 0 : low Data = 1 : high * These pins are set to function as input ports by the power-on reset. Pin circuit
9 8
I/O-4 I/O-5
General-purpose I/O ports
7
O-6
Output port
* The OUT6 bit in the serial data is latched and output from O-6.
6
O-7
Output port
* The OUT7 bit in the serial data is latched and output from O-7. * This pin outputs the 8 Hz clock time base signal when TBC is 1. * This pin is set to the open state by the power-on reset. * PLL charge pump output pins
20 19
PD0 PD1
Charge pump output
When the frequency created by dividing the local oscillator signal frequency by N is higher than the reference frequency, a high level is output from the PD0 pin, and when lower, a low level is output. When the frequencies match, PD0 goes to the high-impedance state. * PD1 operates in a similar manner. * HCTR is selected when CTS1 in the serial data input is set to 1. --The input frequency range is 0.4 to 25 MHz --The signal is passed through an internal divide-by-two circuit and transmitted to a general-purpose counter. An integrating count can also be performed. --The result is output starting with the MSB of the general-purpose counter from the DO pin. --There are four counting time periods: 4, 8, 32, or 64 ms. --See the item on the general-purpose counter for details. * When H/I-6 in the serial data is set to 0 -- This pin functions as an input port, and its state is output from the DO output pin. * LCTR is selected when CTS1 in the serial data input is set to 0. * When CTS0 in the serial data input is set to 1 in the CTS1=0 state. --The circuit operates in frequency measurement mode. --The input frequency range is 10 to 500 kHz. --The signal is transmitted directly to the general-purpose counter. * When CTS0 in the serial data input is set to 0 --The circuit operates in period measurement mode. --The input frequency range is 1 Hz to 20 kHz. --The measurement period can be set to be either 1 period or 2 periods. If 2-period measurement is selected, the input frequency range will be 2 Hz to 40 kHz. --The result is output starting with the MSB of the general-purpose counter from the DO pin. --See the item on the general-purpose counter for details. * When L/I-7 in the serial data input is set to 0. --This pin functions as an input port, and its state is output from the DO output pin.
14
HCTR/I-6
General-purpose counter
S
13
LCTR/I-7
General-purpose counter
No. 6974-6/21
LC72148V Procedures for input and output of serial data Data is input and output using CCB (Computer Control Bus), which is SANYO's audio IC serial bus format. This IC adopts the 8-bit address version of the CCB format.
I/O mode Address B0 B1 B2 B3 A0 A1 A2 A3 Description * Control data input (serial data input) mode 1 IN1 (84) 0 0 0 1 0 0 1 0 * 32 bits of data are input. * See the "Structure of the DI control data (serial data input)" item for the content of the input data. * Control data input (serial data input) mode 2 IN2 (94) 1 0 0 1 0 0 1 0 * 32 bits of data are input. * See the "Structure of the DI control data (serial data input)" item for the content of the input data. * Data output (serial data output) mode 3 OUT (A4) 0 1 0 1 0 0 1 0 * The number of bits of data output is equal to the number of clock cycles. * See the "Structure of the DO output data (serial data output)" item for the content of the output data.
I/O mode determined CE
CL
DI
B0
B1
B2
B3
A0
A1
A2
A3 First Data IN1/2
DO First Data OUT
No. 6974-7/21
[2] IN2 mode
[1] IN1 mode
Structure of the DI control data (serial data input)
(5) Don't care
(7) I/O-C
(5) Don't care (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
* 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 UL1 XS CTP CTC DZ0 DZ1 TEST0 TEST1 TEST2 DLC
(1) P-CTR
(2) PD-C
(3) R-CTR
(4) DO-C (5) Don't care
(6) U-CTR
P0 P1 P2 P3 P4 P5 P6 P7 P8 P9 P10 P11 P12 P13 P14 P15 SNS DVS PDC0 PDC1 R0 R1 R2 R3 DT0 DT1 * CTE CTS0 CTS1 GT0 GT1
10010010
00010010
Address
Address
LC72148V
No. 6974-8/21
LC72148V DI control data functions
Number Control block/data Description * This data sets the divisor provided by the programmable divider. This is a binary value with P15 the MSB. The LSB depends on the DVS and SNS settings. (*: don't care) DVS 1 0 Programmable divider data (1) P0 to P15 DVS, SNS SNS * 1 LSB P0 P0 Set divisor (N) 272 to 65535 272 to 65535 4 to 4095 Related data
0 0 P4 *: When P4 is the LSB, P0 to P3 are ignored.
* DVS selects the input pin (FMIN or AMIN) whose signal is input to the programmable divider and SNS switches the input frequency range. DVS 1 0 0 SNS * 1 0 Input pin FMIN AMIN AMIN Input pin frequency range 10 to 180 MHz 2 to 40 MHz 0.5 to 10 MHz
*: See the "Structure of the Programmable Divider" item for details. * Sub-charge pump control data PDC1 0 (2) Sub-charge pump control data PDC0, PDC1 *: The sub-charge pump is connected to the gate of the low-pass filter amplifier transistor. A high-speed locking circuit can be formed by using this function in conjunction with PD0 and PD1 (main charge pump). See the "Structure of the Charge Pump" item for details. * Reference frequency selection data 1 1 PDC0 * 1 0 High impedance Charge pump operation (normal) Charge pump operation (unlocked mode) UL0 UL1 DLC Sub-charge pump state
R3 0 0 0 0 0 0 0 (3) Reference divider data R0 to R3 0 1 1 1 1 1 1 1 1
R2 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1
R1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1
R0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1
Reference frequency 100 kHz 50 25 25 12.5 6.25 3.125 3.125 10 9 5 1 3 30 PLL inhibit + X'tal OSC stop PLL inhibit
*: PLL INHIBIT In this state, the programmable divider is stopped, the FMIN and AMIN pins are pulled down to ground, and the charge pump goes to the high-impedance state.
Continued on next page.
No. 6974-9/21
LC72148V
Continued from preceding page.
Number Control block/data Description * This data selects the output from the DO pin. ULD 0 0 0 0 1 1 DT1 0 0 1 1 0 0 DT0 0 1 0 1 0 1 DO pin state Low when the unlocked state is detected. Open end-UC *1 IN *2 Open Open end-UC *1 IN *2 Low when the unlocked state is detected. *3 1 1 1 1 0 1 OUT5 *3 I/O-5 pin state Related data
*1. end-UC is the general-purpose counter measurement complete check function.
DO pin (1) Counting starts
DO and I/O-5 pin control data (4) ULD DT0, DT1 IL0, IL1
(2) Counting completes
(3) CE: HI
CTE
(1) When end-UC is set and the counter started (CTE = 0 1), the DO pin automatically goes to the open state. (2) When the general-purpose counter measurement completes, the DO pin goes to the low level, and it becomes possible to check for the count complete state. (3) The DO pin goes to the open state due to the I/O of serial data (when the CE pin is high). *2 IL1 0 0 1 1 IL0 0 1 0 1 Open I-1 (pin state) I-2 (pin state) DO goes low when I-1 changes state. IN
OUT5 I/O-1 I/O-2 I/O-5
However, when the I/O-1 and I/O-2 pins are specified to be output ports, IN will go to the open state. *3: This is invalid if the I/O-5 pin is specified to be an input port. Note: The DO pin will be in the open state, regardless of the state of the DO pin control data, during the data input period (the period when CE is high in IN1 or IN2 mode). Furthermore, the DO pin will output the content of the internal DO serial data in synchronization with CL, regardless of the state of the DO pin control data during the data output period (the period when CE is high in OUT mode). DO cannot be used (it does not change state) in crystal oscillator stopped mode (R0=0, R1=R2=R3=1). (5)
*
Don't Care
Continued on next page.
No. 6974-10/21
LC72148V
Continued from preceding page.
Number Control block/data Description * CTS1 and CTS0 select the input pin (HCTR or LCTR) for the general-purpose counter. CTS1 1 0 0 CTS0 * 1 0 Input pin HCTR LCTR LCTR Measurement mode Frequency Frequency Period Related data
General-purpose counter control data CTS0, CTS1 CTE (6) GT0, GT1
* CTE controls the general-purpose counter measurement operation. CTE = 1: Starts the count = 0: Resets the counter * GT1 and GT0 determine the general-purpose counter measurement time (in frequency mode) and number of periods (in period mode) GT1 GT0 0 1 0 1 Frequency measurement Measurement time 4 ms 8 32 64 Wait time 3 to 4 ms 3 to 4 7 to 8 7 to 8 Period measurement 1 period 1 period 2 periods 2 periods
H/I-6 L/I-7
CTP CTC
0 0 1 1
* When CTE is 0, pulling down the input is disabled by setting CTP to 1. Note: The wait time will be 1 to 2 ms. However, CTP must be set to 1 at least 4 ms before CTE is set to 1. * The input sensitivity is reduced when CTC is set to 1. (Sensitivity: 10 to 30 mVrms) * See the "Structure of the General-Purpose Counter" item for details. I/O port control data I/O-1 to I/O-5 * This data specifies the I/O direction of the shared-function I/O pins (I/O-1 to I/O-5). Data = 0: Input port = 1: Output port * This data determines the output from the output ports O-1 to O-7. Data = 0: Low = 1: Open or high * This data is invalid if input port operation or unlocked state output is specified. * Sets the general-purpose counter pins to function as input ports. H/I-6 = 0: I-6 (input port) = 1: HCTR (general-purpose counter) L/I-3 = 0: I-7 (input port) = 1: LCTR (general-purpose counter) * UL0 and UL1 select the phase error (oE) detection width used for judging the PLL locked state. If a phase error in excess of the widths listed in the table below occurs, the PLL will be seen to be in the unlocked state. When unlocked, the detection pin goes low. (* : don't care) UL1 0 0 (10) Unlocked state detection data UL0, UL1 1 1 UL0 0 1 0 1 oE detection width Stopped 0 0.56 s 1.11 s Detection output Open oE is output directly. oE is extended by 1 to 2 ms. oE is extended by 1 to 2 ms. ULD DT0, DT1 OUT1 to OUT5 ULD
(7)
(8)
Output port data OUT1 to OUT7
I/O-1 to I/O-5 ULD
(9)
General-purpose counter input control data H/I-6, L/I-7
CTS0 CTS1
oE DO I/O-5 Unlocked state output Continued on next page. 1 to 2 ms Extension
No. 6974-11/21
LC72148V
Continued from preceding page.
Number Control block/data Crystal oscillator circuit XS Description * Selects the crystal oscillator. XS = 1: 7.2 MHz = 0: 4.5 MHz * The 4.5 MHz setting is selected after the power-on reset. * Controls the phase comparator's dead band. DZ1 0 (12) Phase comparator control data DZ0, DZ1 0 1 1 DZ0 0 1 0 1 Dead band mode DZA DZB DZC DZD Related data
(11)
The width of the dead band settings: DZA < DZB * DZA is selected after the power-on reset. (We recommend using either DZD or DZC.)
* This data forcibly sets the charge pump output to the low level (Vss). DLC = 1: Low level = 0: Normal operation * When the circuit deadlocks due to the oscillator stopping when the PLL VCO control voltage (Vtune) goes to 0 V, this bit can be used to clear the deadlocked state. (Deadlock clear circuit) This setting is set to normal operation after the power-on reset. * Setting this bit to 1 causes a clock time base signal (8 Hz, 40% duty) to be output from the O-7 pin. (The OUT7 data is invalid in this mode.) * TBC = 0 is selected after the power-on reset. * IC test data. TEST0 TEST1 All these bits must be set to 0. TEST2 All these bits are set to 0 after the power-on reset.
(13)
Charge pump control data
(14)
Clock time base TBC
OUT7
(15)
IC test data TEST0 to TEST2
: Although these bits are initialized by the power-on reset circuit after power is applied, for safety, immediately after power is applied, always initialize this setting by sending the CCB data.
No. 6974-12/21
LC72148V Structure of the DO output data (serial output data) [3] OUT mode
Address
DI
0
1
0
1
0
0
1
0
C19
C18
C17
C16
C15
C14
C13
C12
C11
C9
C8
C7
C6
C5
C4
C3
C2
C1
C0
I7
I6
I5
I4
I3
I2
I1
DO
C10
*
*
*
*
(1) IN-PORT
(2) IF-CTR
*: Must be set to 0.
Description of the DO output data
Number Control block/data Description * This data is latched from the states of I/O port pins I-1 to I-7. This data outputs (reports) the states of the pins regardless of the I/O direction specified for the I/O ports. Data is latched at the point data output mode (OUT mode) is entered. I1 to I5 The I/O-1 to I/O-5 pin states Hi : "1" I6, I7 The HCTR/I-6 and LCTR/I-7 pin states Low : "0" The following data is output if these pins are set to function as output ports or as generalpurpose counter input pins. I1, I2, I3: Output pin states (open drain) I4, I5: Output pin state (CMOS) I6, I7: 0 * This data is latched from the contents of the IF counter (the 20-bit binary counter). C19 MSB of the binary counter C0 LSB of the binary counter Related data
(1)
I/O port data I7 to I1
I/O-1 to I/O-5 H/I-6, L/I-7 OUT1 to OUT5
(2)
IF counter binary data C19 to C0
CTE CTS0 CTS1
Serial data input (IN1/IN2)
CE
tSU, tHD, tEL, tES, tEH 0.45 s
tEL tES
tLC < 0.45 s
tEH
CL tSU DI B0 tHD B1 B2 B3 A0 A1 A2 A3 P0 P1 P2 P3
CTS0 CTS1 GT0 GT1
tLC Internal data
Serial data output (OUT)
CE
tSU, tHD, tEL, tES, tEH 0.45 s
tEL tES
tDC, tDH < 0.2 s
tEH
CL tSU DI B0 tHD B1 B2 B3 A0 A1 A2 A3 tDC DO I7 tDC I6 I5 I4 C3 C2 C1 tDH C0
Note: Since the DO pin is an n-channel open-drain output, the data output times (tDC and tDH) depend on the value of the pull-up resistor used and the circuit board capacitance.
No. 6974-13/21
*
LC72148V Serial data timing
CE tCH CL VIH DI VIL Internal data latch tSU tHD VIL tLC Old New VIH VIL VIH tCL VIL tEL VIH tES VIH tEH VIL
When stopped with CL at the low level
CE tCL CL VIH VIL tCH VIH
VIH
VIL
VIH tEL tES
VIH tEH
DI VIL DO tLC Internal data latch Old New tSU tHD tDC tDH
When stopped with CL at the high level
Parameter Data setup time Data hold time Clock low-level time Clock high-level time CE wait time CE setup time CE hold time Data latch change time
Symbol tSU tHD tCL tCH tEL tES tEH tLC tDC DI, CL DI, CL CL CL CE, CL CE, CL CE, CL
Conditions
Ratings min 0.45 0.45 0.45 0.45 0.45 0.45 0.45 0.45 typ max
Unit s s s s s s s s
Data output time tDH
DO, CL, These times depend on the values of the pull-up resistors used and the circuit board capacitance. DO, CE, These times depend on the values of the pull-up resistors used and the circuit board capacitance.
0.2
s
No. 6974-14/21
LC72148V Structure of the General-Purpose Counter
Input signal switching gate (FIF) LCTR S1 S2 S3 One period/two period extraction circuit Check signal: 900 kHz (T) L S B 0-3 4-7 8-11 12-15
HCTR
1 2
General-purpose counter (20-bit binary counter) M S B 16-19
DO pin
CTE CTS1 CTS0
4/8/32/64 msec GT GT1, GT0 C = FIF x GT C = (1/T) / 900 kHz
CTS1 S1 S2 S3 1 0 0
CTS0 * 1 0
Input pin HCTR LCTR LCTR
Measurement mode Frequency Frequency Period
Frequency range 0.4 to 25.0 MHz 10 to 500 kHz 1.0 to 20 x 103 Hz
Input sensitivity 40 mVrms *1 40 mVrms *1 (pulse) *1 CTC = 0 : 40 mVrms CTC = 1 : 70 mVrms
HCTR: Minimum input sensitivity rating f [MHz] CTC 0 (Normal mode) 1 (Degraded mode) 0.4 f < 8 40 mVrms -- 8 f < 12 40 mVrms (0.1 to 5 mVrms) 70 mVrms (20 to 40 mVrms) 12 f 25 40 mVrms --
LCTR: Minimum input sensitivity rating f [kHz] CTC 0 (Normal mode) 1 (Degraded mode) 10 f < 400 40 mVrms -- 400 f 500 20 mVrms (0.1 to 4 mVrms) 70 mVrms (20 to 30 mVrms)
--: No rating (not guaranteed) ( ): Actual performance (provided for reference purposes)
GT1 0 0 1 1
GT0 0 1 0 1
Frequency measurement mode Measurement time 4 ms 8 32 64 Wait time 3 to 4 ms
Period measurement mode 1 period
7 to 8 ms
2 periods
CTC is the input sensitivity switching data; when CTC is 1, the input sensitivity is degraded. However, the actual performance will be: HCTR 20 to 40 mV rms (frequency: 10.7 MHz) LCTR 20 to 30 mV rms (frequency: 450 kHz) CTP: Pulling down the input is disabled (when CTE is 0) by setting CTP to 1. CTP must be set to 1 at least 4 ms before CTE is set to 1. If the counter is not used, CTP must be left set to 0. The wait time is reduced 1 to 2 ms when CTP is set to 1.
No. 6974-15/21
LC72148V The LC72148V general-purpose counter is a 20-bit binary counter. The results of count operations can be read out MSB first through the DO pin. When using the general-purpose counter for frequency measurement, one of four times, 4, 8, 32, or 64 ms, can be selected as the measurement time with GT0 and GT1. The frequency of the signal input to either the HCTR or LCTR pin can be measured by determining how many pulses were input to the general-purpose counter during this measurement time. When using the general-purpose counter for frequency measurement, the period of the signal input to the LCTR pin can be measured by determining how many cycles of the check signal (900 kHz) were input to the general-purpose counter during 1 or 2 periods of the signal input to the LCTR pin. The general-purpose counter counting is started by setting CTE in the serial data to 1. The serial data is confirmed internally to the LC72148V by dropping the CE signal from high to low. However, the signal input to the HCTR or LCTR pin must be provided within the wait time after CE is set low. Next, the value of the general-purpose counter following completion of the measurement must be read out during the period while CTE is 1. (The general-purpose counter is reset when CTE is set to 0.) One point that requires care here is that the general-purpose counter must be reset (cleared) by setting CTE to 0 before starting the general-purpose counter. Another is that although the signal input to the LCTR pin is transmitted directly to the general-purpose counter, the signal input to the HCTR pin is passed through a divide-by-two circuit before being transmitted to the general-purpose counter. Therefore, the result of the count by the general-purpose counter for the HCTR pin is 1/2 the value as compared to the actual frequency input to the HCTR pin.
CE CTE = 1 Measurement time GT tWU Count start End end-UC tWU: Wait time
For an integrating count
CTE = 1 CE CTE = 1 CTE = 0
Internal data latch (CTE) GT
General-purpose counter Start end-UC Count end *: CTE: 0 1 * Resets the general-purpose counter * Starts the general-purpose counter * Restarts when set to 1 again.
(Integration) Restart Reset
Count end
For an integrating count, the value counted is accumulated in the general-purpose counter. Here, counter overflow may occur, and requires caution. Count value: 0H to FFFFFH (1,048,575)
No. 6974-16/21
LC72148V Structure of the Charge Pump
DLC (Main) fvco/N Phase Detector
PD1
PD0 fref (Main) DZ0 DZ1 PDS Unlock Detector and Subcharge Pump Cont PDC0 PDC1 Unlock R1S (SUB) R1S = 300 (typ) AIN AOUT Vssa
Clock UL0 UL1
DO or I/O-5 pins
PDC1 0 1 1 DLC 0 1
PDC0 * 1 0
PDS (Sub-charge pump state) High impedance Charge pump operation (normal) Charge pump operation (unlocked mode)
PD1, PD0, PDS Normal operation Forced low.
Note*: When the unlocked state is detected when changing stations, PDS (the sub-charge pump) operates, R1 becomes R1M/R1S, the low-pass filter time constant is made smaller, and frequency locking is accelerated.
Vcc R1M PD0 PDS R1S Vtune
No. 6974-17/21
LC72148V Other Items 1. Notes on the phase comparator dead band
DZ1 0 0 1 1 DZ0 0 1 0 1 Dead band mode DZA DZB DZC DZD Charge pumps ON/ON ON/ON OFF/OFF OFF/OFF Dead band --0s -0s +0 s ++0 s
When the charge pumps are in one of the ON/ON states, correction pulses will be output from the charge pumps even if the PLL is locked, making it easier for the loop to become unstable. Thus particular care is required in the design stage for these settings. The following problems may occur when the ON/ON states are used. (1) Side bands may be created by reference frequency leakage. (2) Side bands may be created by low-frequency leakage due to the envelope of the correction pulses. When a dead band is present (the OFF/OFF settings), the loop will be stable. However, it will be difficult to achieve a high signal-to-noise ratio. Inversely, with no dead band, it is easy to achieve a high signal-to-noise ratio but hard to achieve high loop stability. Therefore, the DZA and DZB settings, in which there is no dead band, can be effective for cases where an FM signalto-noise ratio of 90 to 100 dB or greater is required, or when it is desirable to increase the AM stereo pilot margin. However, if such a high signal-to-noise ratio is not required in FM reception, or an adequate AM stereo pilot margin can be achieved, or AM stereo is not used, DZC or DZD, which provide a dead band, should be selected. Dead Zone (Dead Band) Definition The phase comparator compares fp with the reference frequency (fr) as shown in figure 1. This circuit outputs a level (A) that is proportional to the phase difference o as shown in figure 2. However, due to internal delays and other factors, the actual IC is unable to compare small phase differences, and thus a dead zone (B) appears in the output. To achieve a high signal-to-noise ratio in the end product, the dead zone should be as small as possible. However, in popularly-priced models, there are cases where a somewhat wider dead zone may be easier to work with. This is because in some situations, such as when a powerful signal is applied to the RF input, in popularly-priced models there may be RF leakage from the mixer to the VCO. When the dead zone is narrow, outputs to correct this leakage are output, that output in turn modulates the VCO, and generates a beat signal with the RF.
RF MIX Reference divider fr Phase Detector Leakage LPF VCO (B) o (ns) Dead Zone V (A)
Programmable divider
fp
Figure 1
Figure 2
2. Notes on the FMIN, AMIN, HCTR/I-6, and LCTR/I-7 pins The coupling capacitors must be located as close as possible to these pins. A capacitance of approximately 100 pF is desirable. In particular, if the HCTR/I-6 and LCTR/I-7 pin capacitors are over about 1000 pF, the time required to reach the bias level may become excessive, and incorrect counting may occur due to the relationship with the wait time.
No. 6974-18/21
LC72148V 3. Notes on using IF counting with the HCTR/I-6 and LCTR/I-7 pins If IF counting is used, the microcontroller must test the state of the IF IC SD (station detect) signal, and only if the SD signal is present, turn on the IF counter buffer output and perform an IF count operation. Methods in which autosearch operations are implemented only using the IF count may incorrectly stop at frequencies where no station is present due to leakage from the IF counter buffer. 4. Using the DO pin At times other than data output mode, the DO pin can also be used to check for general-purpose counter count operation completion, to output the unlock state detection signal, and to check for changes in the input pins. Note that the states of the input pins (I/O-1 and I/O-2) can be input to the system microcontroller through the DO pin. 5. Power supply pins Capacitors must be inserted between the VDD and VSSd power supply pins to reduce noise. These capacitors must be located as close to the VDD and VSSd pins as possible. 6. Notes on VCO design The VCO (local oscillator) must be designed so that the VCO oscillation does not stop if the control voltage (Vtune) becomes 0 V. If it is possible for this oscillator to stop, use the charge pump control data (DLC) to forcible set Vtune to VCC temporarily to prevent the PLL circuit from deadlocking. (This function is called a deadlock clear circuit.) 7. Notes on the PD pin When switching from the LC72146 (5 V system) to this IC (3 V system), the charge pump output voltage will be reduced, thus reducing the loop gain. Thus various aspects of the circuit, such as the loop filter coefficients, and the locking time (the SD wait time) must be reviewed. 8. Microcontroller interface Although this IC is a 3 V system IC, it can accept 5 V system inputs over the microcontroller interface (the CE, DI, and CL pins). Pin states after a power-on reset
State
Power-on reset XOUT CE DI CL DO XIN VSSa AOUT AIN PD0 PD1 LC72148V VSSd FMIN AMIN VDD HCTR/I-6 LCTR/I-7
Power-on reset
State
O L F F F F F
O-7 O-6 I-5 I-4 I-3 I-2 I-1
O-7 O-6 I/O-5 I/O-4 I/O-3 I/O-2 I/O-1
I-6 I-7
F F
O: Open, L: Low, F: Floating
No. 6974-19/21
LC72148V Sample Application Circuit
FMVcc XOUT 1 Microcontroller CE SO end-UC Unlock ST/MON SD DI CL DO SI O-7 6 O-6 7 I/O-5 8 I/O-4 9 I/O-3 10 I/O-2 11 I/O-1 12 19 PD1 18 VSSd 17 FMIN 16 AMIN 15 VDD 14 HCTR/I-6 13 LCTR/I-7 IF FMVcc ST/MON SD STRQ CE 2 DI 3 CL 4 DO 5 24 XIN 23 VSSa 22 AOUT 21 AIN 20 PD0 AMVCO AMVcc FMVCO
IF AMVcc ST/MON SD STRQ
No. 6974-20/21
LC72148V
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.
This catalog provides information as of April, 2002. Specificati subject to change without notice. ons and information herein are
PS No. 6974-21/21

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