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.
CMOS IC
PLL Frequency Synthesizers
Ordering number:ENN3661B
LC7219, 7219M
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
Overview
The LC7219 and LC7219M are high-performance, phaselocked loop (PLL) frequency synthesizer ICs that operate
over the AM and FM radio w a v ebands. The y feature excellent frequency tracking, making them ideal as reference
frequency sources for use in AM/FM tuners, television and
audio-video equipment, and high-quality car-stereo applications.
The LC7219 and LC7219M operate from a 5 V supply and
are available in 24-pin DIPs and 24-pin MFPs, respectiv ely.
Features
• Programmable divider.
• General-purpose universal counter.
(The IF signal count must be used together with the SD
The timing for the serial data input is shown in figure 2. The first four bits, A0 to A3, are the mode select bits.
In 36-bit transfer mode, the final data bits are T0 and T1, and in 24-bit transfer mode, O6 and CTEN.
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Note
t1≥1.5µs, t2≥0µs, t3≥1.5µs, t4<1.5µs
Figure 2. Input timing
No.3661–5/12
LC7219, 7219M
Serial Data Output
The LC7219 and LC7219M both have an internal 28-bit shift register that comprise two bits representing the state of
IN0 and IN1 (I0 and I1, respectively), a 20-bit general-purpose counter address (C0 to C19) and unlock flags (UL0 to
UL3) as shown in table 3.
The shift register contents are clocked out on DO when the serial data output mode is selected as shown in figure 3.
The internal circuit of outputs DO and OUT0 to OUT6 are shown in figure 4.
The timing for the serial data output is shown in figure 5. Bits A0 to A3 are the mode select bits. When CE goes HIGH,
I0 is output on DO, and each subsequent data bit is output on the falling edge of CL. CE should be held HIGH for 27
clock cycles to allow all data to be output.
In serial data output mode, DO is forced HIGH when CE goes LOW as shown in figure 5. DO goes LOW when the
status of IN0 changes. In frequency or period measurement modes, DO goes LOW when frequency or period measurement is completed.
Note
t1≥1.5µs, t2≥0µs, t3≥1.5µs, t5<1.5µs
Figure 5. Output timing
No.3661–6/12
LC7219, 7219M
Serial Bus Data Transfer
The LC7219 and LC7219M can both transfer data in
three different modes-36-bit input data transfer, 24-bit
input data transfer and 28-bit output data transfer. The
transfer mode is selected by the four data bits on DI
immediately prior to CE going HIGH as shown in figure
6 and table 4. These bits are synchronized to the clock
and are latched into the mode register on the rising edge
of CE.
The configurration of the programmable divider is shown in figure 7. Input mode selection is shown in table 5.
Figure 7. Programmable divider
Table 5. Programmable divider selection
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1
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×
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rewollawseslup
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✓
elbammargorptib-21
redivid
Note
× = don’t care
When an FM signal is input on FMIN, the actual divider
ratio is double the set ratio. For channel steps of 1, 5 and
9 kHz, a 3.6MHz crystal should be used. The programmable divider ratio is determined by the setting of the DV
and SP bits as shown in table 6.
Table 6. Divider ratio settings
VDPSbsloitarteSoitarlautcA
1
×
01 0D53556ot652oitarteS
00 4D6904ot4oitarteS
0D53556ot652oitarteseciwT
troptupnI
NIMF
NIMA
NIMA
Note
× = don’t care
No.3661–7/12
LC7219, 7219M
General-purpose Counter
The 20-bit general-purpose counter is used for both frequency and period measurement as shown in figure 8. The
measurement mode is selected by bits SC and SF as shown in table 7. The counter value is output on DO with the msb
first.
× = don’t care
In frequency measurement mode, the input cycles during a 30 or 60 ms interval are counted. Either LCTR or HCTR
can be selected as the counter input.
In period measurement mode, LCTR is the single input, and the 900kHz cycles in one or two periods of the LCTR
signal are counted.
The counter starts when the CTEN flag is set. The serial input data is latched in on the falling edge of CE. The input
data on HCTR or LCTR should be input within 10 ms of this transition.
The period or frequency measurement count should be read while CTEN is still set to 1, as the counter is reset by
setting CTEN to 0. CTEN should be set to 0 before each measurement.
The LCTR signal is passed directly to the counter input. The HCTR signal is passed through a divide-by-eight
prescaler. The actual HCTR frequency is, therefore, eight times the measured frequency.
When the universal counter is used as the IF counter, the state of the IF-IC SD (station detect) signal must be checked
by the microcontroller, and the IF counter buffer output turned on only after the SD signals are activated. Auto-search
techniques using only the IF counter are not advisable since it is possible that the search can stop incorrectly at a
location that does not have a station due to the IF counter buffer output leakage.
DO goes HIGH when the CTEN flag is set to 1, and LOW when frequency or period measurement is completed. DO
can be monitored to check for measurement completion. The timing for the general-purpose counter is shown in figure
9.
No.3661–8/12
LC7219, 7219M
Figure 9. General-purpose counter timing
Using DO monitor IN0
If the general-purpose counter is not being used and CTEN is 0, DO can be used to monitor changes in the external
input signal IN0 as shown in figure 10.
Figure 10. IN0 output monitoring timing
Notes
1. Specify serial data output. DO goes HIGH after data is output on DO and CE goes LOW.
2. DO goes LOW when IN0 changes.
No.3661–9/12
LC7219, 7219M
Using DO to monitor for measurement completion
DO can be used to monitor for frequency or period measurement completion as shown in figure 11.
Figure 11. Measurement completion timing
Notes
1. Setting CTEN to 1 sets DO HIGH and prevents IN0 from affecting DO.
2. DO goes LOW when the measurement is complete.
Phase-locked Loop
Reading the PLL unlock flags
The PLL unlock flags are set on the rising edge of the internal Φ
signal. In serial data output mode, the flags set since the last rising edge of CE can be read. This is the interval t0 to t
shown in figure 12.
Each PLL unlock flag is set if the corresponding time interval is exceeded as follows.
UL0 is set when Φ
UL1 is set when Φ
UL2 is set when Φ
UL3 is set when Φ
The flag values for different error ranges, where Φ
If Φ
If 0.55µs≤Φ
If 1.11µs≤Φ
If 2.22µs≤Φ
If 3.33µs≤Φ
is the phase error for the 7.2MHz crystal, are as follows.
ERROR
signal and cleared on the rising edge of the CE
ERROR
1
Figure 12. PLL unlock flag timing
No.3661–10/12
LC7219, 7219M
Application Notes
The recommended crystal oscillator for the LC7219 and
LC7219M is the Nihon Dempa Kogyo Co., Ltd. (NDK)
LN-X-0702 (NR-18 type) or the LN-P-0001 (AT-51
type). The oscillator is connected as shown in figure 13.
Figure 13. Crystal oscillator connection
The device parameters for crystal oscillator frequencies
3.6MHz and 7.2MHz are shown in table 8.
T ypical Application
Figure 14 shows a TV/AM/FM system using the IF counting system for electronic tuning.
Table 8. Device parameters vs. crystal frequency
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1
3
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,zHk9,zHk5,zHk1
,zHk05,zHk52,zHk01
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sµ5.1t1t,sµ3
,zHk5.4,zHk5.2,zHk5.0
,zHk52,zHk5.21,zHk5
sµ3
2
Figure 14. TV/AM/FM system
The FMIN, AMIN, HCTR, and LCTR inputs should be capacitively coupled using a capacitor in the range 50 to
100pF. These coupling capacitors should be as close as possible to their respective inputs to minimize the effects of
stray capacitance.
The IF signals measurement should be done afte the IF-IC SD (station detect) signal are activated.
The circuit characteristics for each mode, TV, FM and AM, are shown in table 9.
Table 9. Circuit characteristics
edoMVDPS
VT1
MF1
MA00zHk01zHk000,1zHk054zHk054,1zHk01541
×
×
gninuT
spetsycneuqerf
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ycneuqerfFRycneuqerfFIycneuqerfOCV
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zHM7.01zHM54.846zHk521.3969,21
ecnereferLLP
ycneuqerf
Note
× = don’t care
No.3661–11/12
elbammargorP
oitarredivid
LC7219, 7219M
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 July, 2001. Specifications and information herein are subject to
change without notice.
PS No.3661–12/12
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