Page 1
Ordering number : EN6037
40299RM (OT) No. 6037-1/8
Overview
The LC72723 is an RDS (Radio Data System) signal
demodulation IC. This IC integrates a bandpass filter, the
demodulation circuit, and buffer RAM on a single chip
and can read out RDS data in slave mode operation with
the provision of an external clock input. It also supports
master mode, in which the data is read out in
synchronization with an RDS clock output provided by the
IC itself.
Functions
• Bandpass filter: Switched capacitor filter (SCF)
• RDS demodulation: Functions include 57kHz carrier
regeneration, clock regeneration, biphase decoding, and
differential decoding
• Buffer RAM: Stores 128 bits (about 100 ms) of data.
• Data output: Output can be switched between master
mode and slave mode readout.
• RDS ID detection: Supports ID reset
• Standby control: Stops the crystal oscillator.
• Fully adjustment free.
Ratings
• Operating supply voltage: 4.5 to 5.5 V
• Operating temperature: –40 to 85°C
• Packages: DIP16 and MFP16
Package Dimensions
unit: mm
3006B-DIP16
unit: mm
3035A-MFP16
LC72723, LC72723M
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
RDS Demodulation IC
CMOS IC
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: DIP16
[LC72723]
1
16
8
9
10.1
0.15
0.6051.27
0.35
0.1
1.8max
1.5
0.625
4.4
5.15
6.4
SANYO: MFP16
[LC72723M]
16
1
19.2
0.71 2.54
0.48
9
6.4
7.62
8
3.0
3.65max
3.4
1.2
0.25
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Pin Assignment (DIP16/MFP16)
No. 6037-2/8
LC72723, LC72723M
Block Diagram
Page 3
No. 6037-3/8
LC72723, LC72723M
Pin Descriptions
Pin No. Pin Function I/O Pin circuit type
Reference voltage output (Vdda/2) Output1 VREF
Base band (multiplex) signal input Input2 MPXIN
Subcarrier output (filter output) Output5 FLOUT
Subcarrier input (comparator input) Input6 CIN
Analog system power supply (+5 V) — —3 Vdda
Analog system ground — —4 Vssa
Crystal element output (4.332 MHz) Output8 XOUT
RDS data output Output14 RDDA
RDS clock output (master mode)
RDS clock input (slave mode)
I/O15 RDCL
RDS ID/ready output (Active low) Output
—
—
—
—
16 RDS-ID/READY
Digital system power supply (+5 V)11 Vddd
Digital system ground10 Vssd
Test input7 TEST
Crystal element input (or external reference signal input)
Input
9 XIN
Readout mode setting (0: master, 1: slave)12 MODE
RDS ID and RAM reset (Active high logic)13 RST
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No. 6037-4/8
LC72723, LC72723M
Parameter Symbol Conditions Ratings Unit
Maximum supply voltage V
DD
max Vddd, Vdda * –0.3 to 7.0 V
V
IN
1 max TEST, MODE, RST –0.3 to +7.0 V
Maximum input voltage V
IN
2 max XIN, RDCL –0.3 to Vddd + 0.3 V
V
IN
3 max MPXIN, CIN –0.3 to Vdda + 0.3 V
Vo1 max RDS-ID (READY) –0.3 to +7.0 V
Maximum output voltage Vo2 max XOUT, RDDA, RDCL –0.3 to Vddd + 0.3 V
Vo3 max FLOUT –0.3 to Vdda + 0.3 V
Maximum output current
Io1 max XOUT, FLOUT, RDDA, RDCL +3.0 mA
Io2 max RDS–ID (READY) +20.0 mA
Allowable power dissipation Pd max (Ta ≤ 85°C)
DIP16 : 300 mW
MFP16 : 140 mW
Operating temperature Topr –40 to +85 °C
Storage temperature Tstg –55 to +125 °C
Specifications
Absolute Maximum Ratings at Ta = 25°C, Vssd = Vssa = 0 V
*: Note that Vdda must be less than or equal to Vddd + 0.3 V
Parameter Symbol Conditions
Ratings
Unit
min typ max
Supply voltage V
DD
Vddd, Vdda: Vddd = Vdda 4.5 5.0 5.5 V
High-level input voltage
V
IH
1 TEST, MODE, RST 07 Vddd 6.5 V
V
IH
2 RDCL 0.7 Vddd Vddd V
Low-level input voltage V
IL
TEST, MODE, RST, RDCL 0 0.3 Vddd V
Output voltage
Vo1 RDDA, RDCL Vddd V
Vo2 RDS–ID (READY) 6.5 V
V
IN
1
MPXIN
f = 57 ±2 KHz 50 mVrms
Input amplitude V
IN
2 100% modulation, composite 100 mVrms
VX
IN
XIN 400 1500 mVrms
Guaranteed oscillator operating range Xtal XIN, XOUT: C1 ≤ 120 Ω 4.332 MHz
Crystal oscillator frequency deviation TXtal XIN, XOUT: Fo = 4.332 MHz ±100 ppm
RDCL setup time t
CS
RDCL, RDDA 0 µs
RDCL high-level time t
CH
RDCL 0.75 µs
RDCL low-level time t
CL
RDCL 0.75 µs
Data output time t
DC
RDCL, RDDA 0.75 µS
READY output time t
RC
RDCL, READY 0.75 µs
READY low-level time t
RL
READY 107 ms
Allowable Operating Ranges at Ta = –40 to +85°C, Vssd = Vssa = 0 V, Vddd = Vdda
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No. 6037-5/8
LC72723, LC72723M
Parameter Symbol Conditions
Ratings
Unit
min typ max
Input resistance
Rmpxin MPXIN-Vssa: f = 57 KHz 23 KΩ
Rcin CIN-Vssa: f = 57 KHz 100 KΩ
Internal feedback resistance Rf XIN 1.0 MΩ
Center frequency fc FLOUT 56.5 57.0 57.5 KHz
–3dB bandwidth BW–3dB FLOUT 2.5 3.0 3.5 KHz
Gain Gain MPXIN-FLOUT: f = 57 KHz 28 31 34 dB
Att1 FLOUT: ∆f = ±7 KHz 30 dB
Stop band attenuation Att2 FLOUT: f < 45 KHz, f > 70 KHz 40 dB
Att3 FLOUT: f < 20 KHz 50 dB
Reference voltage output Vref Vref: Vdda = 5 V 2.5 V
Hysteresis V
HIS
TEST, MODE, RST, RDCL 0.1 Vddd V
Low-level output voltage
V
OL1
RDDA, RDCL : I = 2 mA 0.4 V
V
OL2
RDS-ID (READY): I = 8 mA 0.4 V
High-level output voltage V
OH
RDDA, RDCL : I = 2 mA Vddd – 0.4 V
High-level input current
I
IH
1 TEST, MODE, RST, RDCL : VI= 6.5 V 5.0 µA
I
IH
2 XIN: VI= Vddd 2.0 11 µA
Low-level input current
I
IL
1 TEST, MODE, RST, RDCL : VI= 0 V 5.0 µA
I
IL
2 XIN: VI= 0 V 2.0 11 µA
Output off leakage current I
OFF
RDS-ID (READY): VO= 6.5 V 5.0 µA
Current drain Idd Vddd + Vdda 8 mA
Electrical Characteristics at Ta = –40 to +85°C, Vssd = Vssa = 0 V, Vddd = Vdda
Inputs and Outputs
Note: The RDS-ID (READY) pin is an n-channel open-drain output, and data is read out by connecting a pull-up resistor.
TEST MODE Circuit operating mode RDCL pin RDS-ID/READY pin
0 0 Master mode Clock output RDS-ID output
0 1 Slave mode Clock input READY output
1 0 Standby mode (crystal oscillator stopped) — —
1 1 IC test mode (Cannot be set by users.) — —
RST pin
RST = 0 Normal operation
RST = 1 The RDS-ID and demodulation circuits are cleared, and (in slave mode) the READY state and memory are cleared.
RDS ID/READY pin
Master mode RDS-ID output (active low)
Slave mode Readout data ready output (active low)
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RDCL/RDDA Output Timing
• Master mode
No. 6037-6/8
LC72723, LC72723M
RST Operation
• Master mode
RDCL Control in Slave Mode
Caution: After an RST input, the
RDCL and RDDA outputs
stop at the high level until
the first RDS ID detection.
Notes:1. Start RDCL clock input after the READY signal goes low. Applications must stand by with RDCL held low when the READY pin is high.
2. Each time the RDCL input is switched from low to high to low, the application must check the READY signal level after the period t
RC
has elapsed
once RDCL has been set low. If READY is at the low level, the application may apply the next RDCL clock cycle. If READY is high, the application
must stop RDCL input at that point.
3. When the above timing conditions are met, RDDA can be read at either the rise or fall of the RDCL signal.
4. After the last data from memory has been read, READY will be high once the period t
RC
has elapsed after the fall of the RDCL signal. If even 1 bit
of data has been written to memory, READY will be low and the application will be able to read that data.
Parameter Symbol Conditions
Ratings
Unit
min typ max
RDCL setup time t
CS
RDCL, RDDA 0 µs
RDCL high-level time t
CH
RDCL 0.75 µs
RDCL low-level time t
CL
RDCL 0.75 µs
Data output time t
DC
RDCL, RDDA 0.75 µs
READY output time t
RC
RDCL, READY 0.75 µs
Ready low-level time t
RL
READY 107 ms
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5. When switching channels, it is desirable to immediately reset memory and the READY pin with an RST input. If this is not done, data received on the
previous channel may remain in memory. When the IC is reset, data is not written until the RDS-ID is detected, and therefore, the READY signal will go
low after the RDS-ID is detected. (Although the RDS-ID is not output in slave mode, it is detected internally in the IC.) After an RST input, once an RDSID has been detected, all received data will be written to memory regardless of the RDS-ID detection state.
6. The readout mode may be switched between master and slave modes during readout. Applications must observe the following points to assure data
continuity during this operation.
• Data acquisition timing in master mode
Data must be read on the falling edge of RDCL.
• Timing of the switch from master mode to slave mode
After the RDCL output goes low and the RDDA data has been acquired, the application must set MODE high immediately. Then, the microcontroller
starts output by setting the RDCL signal low. The microcontroller RDCL output must start within 840 µs (tms) after RDCL went low. In this case, if the
last data read in master mode was data item n, then data starting with item n+1 will be written to memory.
• Timing of the switch from slave mode to master mode
After all data has been read from memory and READY has gone high, the application must then wait until READY goes low once again the next time
(timing A in the figure), immediately read out one bit of data and input the RDCL clock. Then, at the point READY goes high, the microcontroller must
terminate RDCL output and then set MODE low. The application must switch MODE to low within 840 µs (tms) after READY goes low (timing A in the
figure).
No. 6037-7/8
LC72723, LC72723M
RDCL (IC status)
RDCL (microcontroller status)
Page 8
PS No. 6037-8/8
LC72723, LC72723M
LC72723 Sample Application Connection Circuit (for slave mode operation)
Caution: If the RST pin is unused, it must be connected to ground.
This catalog provides information as of April, 1999. 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,
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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.
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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
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