Ordering number : ENN6310A
30300RM (OT) No. 6310-1/14
Overview
The LA1650 and LA1650C receive long-wave time
standard broadcasts (JG2AS in Japan and DCF77 in
Germany) and detect and output the time code multiplexed
on the long-wave time standard broadcast signal. Clocks
can automatically correct their time using the time code
information received by the LA1650 and LA1650C.
Features
Low-voltage operation (V
CC
op = 1.2 V and higher)
Low current drain (500 A for @ 10 dB V input)
Standby mode current: Less than 1 A
High sensitivity (Reception is possible at
Vin = 10 dB V.)
Packages: DIP18 (LA1650)
Chip (LA1650C)
Functions
RF amplifier, rectifier, detector, time code output,
standby circuit
Package Dimensions
unit: mm
3007A-DIP18
1
9
18
10
24.2
1.94 2.54
1.2
0.5
3.25
3.3
3.85max
0.25
7.62
6.4
SANYO: DIP18
[LA1650]
LA1650, 1650C
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
Time Code Reception ICs
Monolithic Linear 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.
Parameter
Symbol
Conditions
Ratings
Unit
Maximum supply voltage
V
CC
max
7.5
V
Allowable power dissipation
Pd max
Ta
75C
100
mW
Operating temperature
Topr
20 to +75
C
Storage temperature
Tstg
40 to +125
C
Specifications
Maximum Ratings
at Ta = 25C
Parameter
Symbol
Conditions
Ratings
Unit
Recommended supply voltage
V
CC
1.5
V
Operating supply voltage range
V
CC
OP
1.2 to 6.5
V
Operating Conditions
at Ta = 25C
No. 6310-2/14
LA1650, 1650C
Parameter
Symbol
Conditions
Ratings
Unit
min
typ
max
[Overall Characteristics]
Current drain
I
CCO
No input
400
540
680
A
Operating current
I
CC
f
IN
= 40 kHz, V
IN
= 10 dBV
370
510
650
A
Standby current
ISTB
With the pin 5 (pad 5) voltage at 0 V
0.1
1.0
A
[Amplifier Input Characteristics]
Input impedance
ZI
1pin (PAD1)
450
k
Input frequency range
FIN
37.5
80.0
kHz
Minimum input voltage
V
IN
min
Pin 1 (pad 1) input
1
Vrms
Maximum input voltage
V
IN
max
Pin 1 (pad 1) input
100
mVrms
[Amplifier Output Characteristics] With pin 1 (pad 1) as the input pin, f
IN
= 40 kHz
Output voltage (1)
V
O
1
No input, the pin 11 output
10
20
34
mVrms
Output voltage (2)
V
O
2
V
IN
= 10 dBV, the pin 11 output
15
28
48
mVrms
Output voltage (3)
V
O
3
V
IN
= 20 dBV, the pin 11 output
25
40
62
mVrms
Output voltage (4)
V
O
4
V
IN
= 80 dBV, the pin 11 output
35
48
88
mVrms
[TCO Output Characteristics] With pin 1 (pad 1) as the input pin, f
IN
= 40 kHz
Output voltage (high)
V
O
H
No input
1.40
1.45
V
Output voltage (low)
V
O
L
V
IN
= 10 dBV
0.05
0.10
V
Output pulse width (500 ms input)
T500
V
IN
= 0 to 100 dBV, AM modulation
480
500
650
ms
(1 Hz square wave, duty = 50%, 100% modulation)
Output pulse width (800 ms input)
T800
V
IN
= 0 to 100 dBV, AM modulation
750
800
970
ms
(1 Hz square wave, duty = 80%, 100% modulation)
Output pulse width (200 ms input)
T200
V
IN
= 0 to 100 dBV, AM modulation
180
200
400
ms
(1 Hz square wave, duty = 20%, 100% modulation)
Operating Characteristics
at Ta = 25C, V
CC
= 1.5 V, with the pin 5 used as V
CC,
in the specified test circuit,
unless otherwise specified. Values in parentheses refer to the LA1650C. (Using the Yamaichi Electronics IC37N-
1803 socket.)
Chip Specifications (LA1650C)
No. 6310-3/14
LA1650, 1650C
Pad Coordinates (LA1650C)
Note: The origin (0, 0) is taken to be the left lower corner in the metal pattern figure on the next page.
The pad coordinates are the values of the coordinates of the center of the pad.
PAD
Pad
Symbol
X-axis
Y-axis
P1
Amplifier (1) input
INPUT
585
1914
P2
AGC
AGC2
385
1914
P3
AGC1
154
1734
P4
V
CC
V
CC
158
1410
P5
Standby mode
PON
154
1221
P6
Amplifier (1) output
AMP1_OUT1
154
711
P7
AMP1_OUT2
164
201
P8
Amplifier (2) input
AMP2_IN1
397
154
P9
AMP2_IN2
597
154
P10
Amplifier (2) output
AMP2_OUT2
864
154
P11
AMP2_OUT1
1086
154
P12
REC input
REC_IN1
1264
361
P13
REC_IN2
1264
531
P14
REC output
REC_OUT1
1264
701
P15
DEC input
DEC_IN1
1264
1455
P16
DEC output
TCO
1264
1625
P17
GND
GND
1113
1914
P18
REG
REG
849
1914
Chip size
1.41
2.06
mm
2
Chip thickness
330 (20)
m
Pad size
140
140
m
2
Pad opening
115
115
m
2
Metal Pattern Figure
No. 6310-4/14
LA1650, 1650C
2
1
18
17
16
1A1650
X : 1.41
Y : 2.06
15
14
13
12
11
10
9
8
7
6
5
4
3
Pattern
Chip size
1A1650
A12842
NC
NC
Block Diagram and Test Circuit
No. 6310-5/14
LA1650, 1650C
1
Input
V
CC
2
10
F2
2
F
10
F
22
F
0.015
F
TCO
1M
1M
1000pF
1000pF
Power ON
Standby
40 kHz crystal
100
F
3
4
5
6
7
8
9
18
17
16
15
14
13
12
11
10
AMP(1)
REG
DEC
AMP(2)
REC
51
+
+
+
+
+
A12758
No. 6310-6/14
LA1650, 1650C
Pin Functions
(V
CC
= 1.5 V)
Pin No.
Function
No-signal voltage (V)
Notes
Equivalent circuit
1.5
The input impedance, Zi, is
450 k
.
Connect the antenna coil
between pins 1 and 4.
Recommended coil: ACL-80
(Sumida Electronics)
1
Amplifier (1) input
4
1
A12759
0.6
0.6
The AGC operating speed is
determined by the capacitor
connected between pin 3 and
ground.
2
3
AGC (1) input
AGC (2) input
3
2
17
A12760
1.5
4
V
CC
1.5
This LA1650 operates normally
with pin 5 at V
CC
. The device
goes to standby mode (I
CC
1
A) when this pin is pulled to
ground.
5
PON
4
5
18
17
A12761
0.7
Connect the crystal oscillator
elements between pins 6 and 8,
and pins 7 and 9.
Recommended element: VTC-
200 (Seiko Instruments)
40 kHz, 12.5 pF
6
7
Amplifier (1) output
6
7
17
A12762
0.8
R
IN
= 20 k
8
9
Amplifier (2) input
8
RIN
RIN
17
9
A12763
Continued on next page.
No. 6310-7/14
LA1650, 1650C
Continued from preceding page.
Pin No.
Function
No-signal voltage (V)
Notes
Equivalent circuit
0.7
Emitter-follower output
10
11
Amplifier (2) output
10
11
4
17
A12764
0.8
Full-wave rectifier circuit input
R
IN
= 20 k
12
13
REC input
13
12
RIN
RIN
A12765
0.8
Full-wave rectifier circuit output
R
OUT
= 75 k
High-frequency components
are smoothed by the capacitor
connected between pin 14 and
ground.
14
REC output
4
ROUT
14
17
A12766
0.7
Wave shaping circuit input
15
DEC input
17
15
A12767
--
Wave shaping circuit output
R
OUT
= 100 k
This pin outputs the time code.
(Inverted output)
16
DEC output
4
ROUT
16
17
A12768
0
17
GND
0.8
Vreg = V
CC
0.7 V
18
REG
4
5
18
17
A12769
Block Functional Descriptions
Amplifier Block
The radio signal picked up by the bar antenna (resonant frequency: 40 kHz for Japan) is amplified by amplifier 1 which
includes an AGC function, and is passed through a 40 kHz crystal element used as a bandpass filter. This signal is then
amplified further by amplifier 2. The total gain from the amplifier 1 input to the amplifier 2 output is 90 dB when the
AGC is disabled.
The AGC voltage is set up to be about 0.6 V when there is no input present. However, since charging is performed by a
small current of only a few A, we recommend precharging if the LA1650 is used for reception immediately after power
is applied. (Charge to about 1.0 V for about 100 ms.)
DEC Block
The time code signal (1 Hz) from which the 40 kHz carrier has been removed is input to the DEC block, and wave
shaping is applied to create a serial output signal in which 1 and 0 have the levels V
CC
and ground, respectively.
No. 6310-8/14
LA1650, 1650C
AMP(1) witn AGC
AMP(2)
Crystal
A12770
Since amplifier 1 has frequency characteristics of 3 dB at fc = 80 kHz from the output level at fc = 40 kHz, and
amplifier 2 has frequency characteristics that are flat up to 100 kHz, this IC can support the standard radio frequencies
used in any country simply by changing bar antenna and the resonant frequency of the crystal used.
REC Block
The 40 kHz carrier signal output from amplifier 2 is input to the REC block through a 1000 pF capacitor. The REC block
input impedance is 20 k
, which, in conjunction with the 1000 pF capacitor, forms a high-pass filter with a cutoff
frequency of about 8 kHz. The carrier is full-wave rectified within the REC block, split into two signal systems, and
output. One signal system passes through a low-pass filter with a time constant of about 1 s and is then input to the DEC
block. The other passes through a low-pass filter with an even larger time constant and is fed back to amplifier 1 as the
AGC control voltage (pin 3: a DC voltage).
Rectifier
Low-pass filter
(time constant: 1 s)
Low-pass filter
(time constant: several seconds or longer)
To the DEC block
AGC voltage (to amplifier 1)
A12771
Decoder
VCC
GND
A12772
Antenna (prototype) Specifications
Model number:
ACL-80 (Sumida Electronics)
Prototype number:
74M-656
Inductance:
588 H (reference value at 10 kHz)
Tuning frequency:
40 kHz
Mounting capacitance: 27000 pF
Winding:
UEW 0.35
Number of windings:
94 turns (4-3)
* Consult with your Sanyo representative before starting mass production.
Pin Connections (back surface)
No. 6310-9/14
LA1650, 1650C
1
2
3
4
S
A12773
0
180
35
180
10
20
0
40
45
Phase,
-- deg.
Impedance, Z -- k
Impedance, Z
Phase,
Frequency, f -- kHz
,
Z -- f
Antenna Dimensions (trigonometric)
No. 6310-10/14
LA1650, 1650C
18.0
3.5
60.0
5.0
0.7
9.0
10.0
7.5
7.5
65.0
80.0
A12843
Sample Application Circuit
No. 6310-11/14
LA1650, 1650C
1
V
CC
Bar ANT
2
10
F2
2
F
10
F
22
F
0.015
F
TCO
PON
1M
1M
1000pF
1000pF
40 kHz crystal
100
F
3
4
5
6
7
8
9
18
17
16
15
14
13
12
11
10
+
+
+
+
+
A12774
Microcontroller
Display
LA1650
LA1650 Evaluation Procedure
Two relatively simple techniques for measuring the sensitivity index are (1) to input the signal generator output directly
to the IC (see figure 1), and (2) to use an antenna as shown in figure 2.
No. 6310-12/14
LA1650, 1650C
1
2
TCO
3
4
18
17
16
15
+
+
+
+
LA1650
A12776
Bar antenna
Loop antenna
1
2
TCO
51
SG
3
4
18
17
16
15
+
+
+
+
LA1650
A12775
50
output
SG
Figure 1 Direct Signal Generator Input to the IC
Figure 2 Antenna to Antenna Signal Input
The following three techniques are practical test procedures. Note that since the output from the LA1650 pin 16 is
inverted from the value of the time code, an inverter must be inserted between the output and the microcontroller.
Continuously output a signal with the value 1 (fc = 40 kHz, AM modulation (90%), fm = 1 Hz (square wave, duty =
50%)) and read out the value 1 from the LA1650. Then, lower the signal generator level until the LA1650 can no
longer correctly output the 1 level. The minimum signal generator level at which correct reception occurs is the
sensitivity.
When monitoring the LA1650 output signal with a microcontroller, monitor the output pulse width for the range listed
in table 1. The output signal should be observed to be a 1 Hz signal, with a period of 1000 25 ms. (See figure 3.)
Continuously output a signal with the value 0 (fc = 40 kHz, AM modulation (90%), fm = 1 Hz (square wave, duty =
80%)) and read out the value 0 from the LA1650. Then, lower the signal generator level until the LA1650 can no
longer correctly output the 0 level. The minimum signal generator level at which correct reception occurs is the
sensitivity.
When monitoring the LA1650 output signal with a microcontroller, monitor the output pulse width for the range listed
in table 2. The output signal should be observed to be a 1 Hz signal, with a period of 1000 25 ms. (See figure 4.)
Create a simulated time standard radio signal (fc = 40 kHz, AM modulation (90%), fm = 1 Hz time code (this signal
you will have to create yourself)) and verify that the time is modified correctly. The sensitivity is then the minimum
level for which the time is modified correctly.
When monitoring the LA1650 output signal with a microcontroller, monitor the output pulse width for the ranges listed
in table 3. The output signal should be observed to be a 1 Hz signal, with a period of 1000 25 ms. (See figure 4.)
No. 6310-13/14
LA1650, 1650C
1000
25 ms
480 to 650 ms
TCO rise (reference)
A12777
Table 1 Signal Value 1 Range
Item
min
typ
max
unit
Output pulse width
480
500
650
ms
(500 ms input)
1000
25 ms
750 to 970 ms
TCO rise (reference)
A12778
Table 2 Signal Value 0 Range
Item
min
typ
max
unit
Output pulse width
750
800
970
ms
(800 ms input)
Table 3 Time Code Signal Output Ranges
Item
min
typ
max
unit
Output pulse width
480
500
650
ms
(500 ms input)
Output pulse width
750
800
970
ms
(800 ms input)
Output pulse width
180
200
400
ms
(200 ms input)
Figure 3 Time Code Value 1 Signal Output
Figure 4 Time Code Value 0 Signal Output
PS No. 6310-14/14
LA1650, 1650C
This catalog provides information as of March, 2000. 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.
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