Datasheet LA1650C, LA1650 Datasheet (SANYO)

Page 1

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 (VCCop = 1.2 V and higher)

• Low current drain (500 µA for @ 10 dBµ V input)

• Standby mode current: Less than 1 µA

• High sensitivity (Reception is possible at Vin = 10 dBµ V.)

• Packages: DIP18 (LA1650)

Chip (LA1650C)

Functions

• RF amplifier, rectifier, detector, time code output, standby circuit

Package Dimensions

unit: mm

3007A-DIP18

24.2

1.94 2.54

1.20.5

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

max 7.5 V Allowable power dissipation Pd max Ta ≤ 75°C 100 mW Operating temperature Topr –20 to +75 °C Storage temperature Tstg –40 to +125 °C

Specifications

Maximum Ratings at Ta = 25°C

Parameter Symbol Conditions Ratings Unit

Recommended supply voltage V

1.5 V

Operating supply voltage range V

OP 1.2 to 6.5 V

Operating Conditions at Ta = 25°C

Page 2

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 µA

Operating current I

CCfIN

= 40 kHz, VIN= 10 dBµV 370 510 650 µA

Standby current ISTB With the pin 5 (pad 5) voltage at 0 V 0.1 1.0 µA

[Amplifier Input Characteristics]

Input impedance ZI 1pin (PAD1) 450 kΩ Input frequency range FIN 37.5 80.0 kHz Minimum input voltage V

min Pin 1 (pad 1) input 1 µVrms

Maximum input voltage V

max Pin 1 (pad 1) input 100 mVrms

[Amplifier Output Characteristics] With pin 1 (pad 1) as the input pin, f

= 40 kHz

Output voltage (1) V

1 No input, the pin 11 output 10 20 34 mVrms

Output voltage (2) V

2VIN= 10 dBµV, the pin 11 output 15 28 48 mVrms

Output voltage (3) V

3VIN= 20 dBµV, the pin 11 output 25 40 62 mVrms

Output voltage (4) V

4VIN= 80 dBµV, the pin 11 output 35 48 88 mVrms

[TCO Output Characteristics] With pin 1 (pad 1) as the input pin, f

= 40 kHz

Output voltage (high) V

H No input 1.40 1.45 V

Output voltage (low) V

LVIN= 10 dBµV 0.05 0.10 V

Output pulse width (500 ms input) T500

= 0 to 100 dBµV, AM modulation

480 500 650 ms

(1 Hz square wave, duty = 50%, 100% modulation)

Output pulse width (800 ms input) T800

VIN= 0 to 100 dBµV, AM modulation

750 800 970 ms

(1 Hz square wave, duty = 80%, 100% modulation)

Output pulse width (200 ms input) T200

= 0 to 100 dBµV, AM modulation

180 200 400 ms

(1 Hz square wave, duty = 20%, 100% modulation)

Operating Characteristics at Ta = 25°C, VCC= 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 IC37N1803 socket.)

Page 3

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

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

Chip thickness 330 (±20) µm Pad size 140 × 140 µm

Pad opening 115 × 115 µm

Page 4

Metal Pattern Figure

No. 6310-4/14

LA1650, 1650C

2 1 18 17

1A1650

X : 1.41 Y : 2.06

111098

Pattern

Chip size

1A1650

A12842

Page 5

Block Diagram and Test Circuit

No. 6310-5/14

LA1650, 1650C

Input

10µF22µF

10µF

22µF

0.015µF

TCO

1MΩ

1000pF

Power ON Standby

40 kHz crystal

100µF

3 4 5 6 7 8 9

18 17 16 15 14 13 12 11 10

AMP(1)

REG DEC

AMP(2)

REC

51Ω

A12758

Page 6

No. 6310-6/14

LA1650, 1650C

Pin Functions (VCC= 1.5 V)

Pin No. Function No-signal voltage (V) Notes Equivalent circuit

1.5

The input impedance, Zi, is 450 kΩ.

Connect the antenna coil between pins 1 and 4.

Recommended coil: ACL-80 (Sumida Electronics)

1 Amplifier (1) input

A12759

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

A12760

1.54

1.5

This LA1650 operates normally with pin 5 at V

. The device

goes to standby mode (I

≤ 1 µA) when this pin is pulled to ground.

5 PON

A12761

0.7

Connect the crystal oscillator elements between pins 6 and 8, and pins 7 and 9.

Recommended element: VTC200 (Seiko Instruments)

40 kHz, 12.5 pF

6 7

Amplifier (1) output

6 7

A12762

0.8

RIN= 20 kΩ

8 9

Amplifier (2) input

A12763

Continued on next page.

Page 7

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

A12764

0.8

Full-wave rectifier circuit input R

= 20 kΩ

12 13

REC input

A12765

0.8

Full-wave rectifier circuit output R

OUT

= 75 kΩ

High-frequency components are smoothed by the capacitor connected between pin 14 and ground.

14 REC output

OUT

A12766

0.7 Wave shaping circuit input15 DEC input

A12767

—

Wave shaping circuit output R

OUT

= 100 kΩ This pin outputs the time code. (Inverted output)

16 DEC output

OUT

A12768

017 GND

0.8

Vreg = VCC– 0.7 V

18 REG

A12769

Page 8

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 µA, 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 VCCand 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 kΩ, 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

GND

A12772

Page 9

Antenna (prototype) Specifications

Model number: ACL-80 (Sumida Electronics) Prototype number: 74M-656 Inductance: 588 µH (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

A12773

180

–180

40 45

Phase,θ — deg.

Impedance, Z — kΩ

Impedance, Z

Phase, θ

Frequency, f — kHz

θ, Z — f

Page 10

Antenna Dimensions (trigonometric)

No. 6310-10/14

LA1650, 1650C

18.03.5

60.0

5.0

0.7

9.0

ø10.0

7.5 7.5

65.0

80.0

A12843

Page 11

Sample Application Circuit

No. 6310-11/14

LA1650, 1650C

Bar ANT

10µF22µF

10µF

22µF

0.015µF

TCO

PON

1MΩ

1000pF

40 kHz crystal

100µF

3 4 5 6 7 8 9

18 17 16 15 14 13 12 11 10

A12774

Microcontroller

Display

LA1650

Page 12

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 Ω

3 4

18 17 16 15

LA1650

A12775

50 Ω output

Figure 1 Direct Signal Generator Input to the IC

Figure 2 Antenna to Antenna Signal Input

Page 13

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)

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

TCO rise (reference)

1000 ±25 ms

750 to 970 ms

A12778

Page 14

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.