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Ordering number : EN4159B

Monolithic Linear IC

LA1835
Home Stereo Single-Chip Tuner IC with Electronic Tuning Support

Overview
The LA1835 is an AM, FM IF and MPX single-chip tuner IC that supports electronic tuning. It was developed specifically for use in home stereo products and is optimal for products with auto-seek systems, since it combines SD and IF counting in its auto-seek implementation. Furthermore, since the FM detector and MPX VCO circuits are adjustment free, adoption of the LA1835 can reduce the number of adjustment steps in the production line.

· Support for AM low band cut control · Adjustable AM stop sensitivity

Package Dimensions
unit: mm 3196-DIP30SD
[LA1835]

Functions
· AM: RF amplifier, mixer, oscillator (with ALC), IF amplifier, detector, AGC, oscillator buffer, tuning indicator (narrow-band SD), IF buffer output, stereo IF output · FM IF: IF amplifier, quadrature detector, band muting, tuning indicator, IF buffer output, S-meter · MPX: PLL stereo decoder, stereo indicator, forced mono, VCO stop function, adjacent channel interference rejection function (114 kHz), postamplifier with muting function

SANYO: DIP30SD

Features
· Significant reduction in the number of manufacturing adjustment steps FM detector: Adjustment free (using a ceramic discriminator) MPX VCO: Adjustment free (using a ceramic resonator) · Tuning indicator output provided. (This pin can also be used as a narrow band stop signal and as a muting drive output.) · Adjustable FM stop sensitivity and bandwidth · Built-in AM local oscillator buffer
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 Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
11795TH (OT) No. 4159-1/14

LA1835

Specifications
Maximum Ratings at Ta = 25°C
Parameter Maximum supply voltage Allowable power dissipation Operating temperature Storage temperature Symbol VCC max Pd max Topr Tstg Ta 70°C Conditions Ratings 9.0 550 ­20 to +70 ­40 to +125 Unit V mA °C °C

Operating Conditions at Ta = 25°C
Parameter Recommended supply voltage Operating supply voltage Symbol VCC VCC op Conditions Ratings 7.0 6.5 to 8.5 Unit V V

Operating Characteristics at Ta = 25°C, VCC = 7.0 V, in the specified test circuit using the IC59-3004 socket (Yamaichi Electric Co., Ltd.)
Parameter Symbol Conditions min typ max Unit [FM Characteristics (mono): fc = 10.7 MHz, fm = 1 kHz] Quiescent current Demodulator output Channel balance (monaural) Total harmonic distortion Signal-to-noise ratio AM suppression ratio Input limiting voltage SD indicator sensitivity SD indicator bandwidth IF counter buffer output ICCO-FM VO-FM THD-FM S/N-FM AMR ­3dBL.S SD-on-FM SD-BW VIF Buff-FM 100 dBµ 100 dBµ, the pin 11 output No input 100 dBµ, 100% modulation, the pin 16 output 23 665 ­1.5 37 1000 0 0.3 67 35 74 50 27 47 120 80 0 0.7 2.5 80 57 190 120 0.3 1.5 4.0 95 35 67 280 160 1.0 2.5 5.0 46 1330 +1.5 1.5 mA mVrms dB % dB dB dBµ dBµ kHz mVrms V V V dB

C. B-momo 100 dBµ, 100% modulation, pin 16 output/pin 17 output 100 dBµ, 100% modulation, the pin 16 output 100 dBµ, 100% modulation, the pin 16 output 100 dBµ, 30% AM modulation, the pin 16 output 100 dBµ, referenced to 100%, with the input down 3 dB

VSM-FM (1) 0 dBµ, the pin 12 output S-meter output VSM-FM (2) 60 dBµ, the pin 12 output VSM-FM (3) 100 dBµ, the pin 12 output Muting attenuation Mute-Att 100 dBµ, 100% modulation, the pin 16 output [FM Characteristics (stereo): fc = 10.7 MHz, fm = 1 kHz, L + R = 90%, pilot = 10%, VIN = 100 dBµ] Separation-left Separation-right Stereo on level Stereo off level Total harmonic distortion (main) Channel balance (main) Capture range Adjacent channel rejection ratio Sep-L Sep-R ST-on ST-off THD-main C. B-main C. R. B. Rej Left channel modulated; pin 17 output/pin 16 output Right channel modulated; pin 16 output/pin 17 output The pilot modulation such that V7 < 0.7 V The pilot modulation such that V7 > 4.5 V The pin 16 output Pin 16 output/pin 17 output Pilot = 10% fs = 113 kHz, VS = 90%, pilot = 10%, the pin 16 output

30 30 1.8

45 45 3.6 2.5 0.3 1.5 +1.5 6.0

dB dB % % % dB % dB

­1.5

0 ±1.5 40

[AM Characteristics: fc = 1000 kHz, fm = 1 kHz] Quiescent current Detector output ICCO-AM VO-AM (1) VO-AM (2) S/N-AM (1) S/N-AM (2) No input 23 dBµ, 30% modulation, the pin 16 output 80 dBµ, 30% modulation, the pin 16 output 23 dBµ, 30% modulation, the pin 16 output 80 dBµ, 30% modulation, the pin 16 output 21 25 195 16 48 29 45 310 20 54 0.3 0.4 1.0 20 No input, the pin 30 output The output for fm = 100 Hz referenced to fm = 1 kHz 80 dBµ, unmodulated signal, the pin 11 output 80 dBµ, unmodulated signal, the pin 8 output 110 5.0 140 8.0 0 1.3 30 160 7.0 200 17.0 0 3.0 11.0 280 24.0 0.2 4.5 1.0 1.2 4.0 40 42 90 490 mA mVrms mVrms dB dB % % % dBµ mVrms dB mVrms mVrms V V

Signal-to-noise ratio

THD-AM (1) 80 dBµ, 30% modulation, the pin 16 output Total harmonic distortion THD-AM (2) 100 dBµ, 30% modulation, the pin 16 output THD-AM (3) 80 dBµ, 80% modulation, the pin 16 output SD indicator sensitivity Local oscillator buffer output Low-band attenuation IF counter buffer output Stereo IF output S-meter output SD-on-AM VOSC-AM Low-Cut VIF Buff-AM VSTIF-AM

VSM-AM (1) 0 dBµ, unmodulated signal VSM-AM (2) 40 dBµ, unmodulated signal

No. 4159-2/14

LA1835 Sample Application Circuit

No. 4159-3/14

LA1835 Test Circuit Diagram

Note: Since an IC socket is used, these values differ from those used when the IC is mounted on a printed circuit board.

No. 4159-4/14

LA1835 Pin Functions
No. Function Voltage Internal equivalent circuit Note

1

FM IF input

Vreg

Input impedance: ri = 330

2

AM mixer output

VCC

Recommended AM IFT coil: PCFAZ-037 (Toko Co., Ltd.)

3

FM IF input bypass

Vreg

Also used for the AF noise filter.

4

REG

Vreg

Vreg = 3.6 V

5

AM IF input

Vreg

Input impedance: ri = 2 k

6

GND

0

7 8

Tu-LED ST-LED Also functions as the AM IF output.

VCC VCC Active low open collector outputs Pin 8 is used for the AM stereo IF output.

9

FM detector

2.1 (FM) 2.7 (AM)

Recommended ceramic discriminator: CDA 10.7MG-48 (Murata Mfg. Co., Ltd.)

Continued on next page. No. 4159-5/14

LA1835
Continued from preceding page.
No. 10 VCC Function Voltage VCC Internal equivalent circuit Note

11

AM/FM IF buffer output Also functions as the output control switch (muting switch).

0

A voltage of 1.3 V or higher turns on the postamplifier output muting. A voltage of 4.0 V or higher turns on the IF buffer output. The recommended control voltage for turning muting on is 1.9 V.

12

S-meter output Also functions as the AM SD sensitivity adjustment.

0.3 (FM) 0 (AM)

The AM SD sensitivity can be adjusted with the resistor inserted between this pin and ground. Since the FM SD sensitivity is affected by this resistor, the AM SD sensitivity must be adjusted first.

13

AM narrow band ceramic filter connection

1.5

Recommended narrow band ceramic filter: BFU450 C4N (Murata Mfg. Co., Ltd.)

14

Phase comparator lowpass filter (FM/AM switch)

VCC ­ 1.4 (FM) 0 (AM)

The LA1835 switches to AM mode when this pin is connected to ground.

15

Pilot detector low-pass filter (forced mono) (VCO stop)

VCC ­ 1.0

If a current of 50 µA or larger flows from this pin, the LA1835 switches to mono mode. The VCO is stopped if this pin is connected to ground.

16 17

Post-amplifier left and right outputs

Vreg Vreg

Output impedance: ro = 200 Pin 16: left output Pin 17: right output

18 19

Post-amplifier left and right inputs

Vreg Vreg

Inverting inputs, ri = 3.3 k Pin 18: left input Pin 19: right input

Continued on next page. No. 4159-6/14

LA1835
Continued from preceding page.
No. Function Voltage Internal equivalent circuit Note

20 21

MPX outputs Left and right outputs

3.5 3.5

Output impedance ro = 3.3 k Pin 20: left de-emphasis Pin 21: right de-emphasis

22

MPX input

2.9

Input impedance ri = 20 k Increasing the value of the external capacitor connected between this pin and pin 24 improves the low frequency separation characteristics. However, the impulse noise associated with switching between AM and FM also increases.

23

MPX VCO

3.5 (FM) 0 (AM)

Recommended ceramic oscillator: CSB456F15 (Murata Mfg. Co., Ltd.)

24

AM/FM demodulator output

2.9 (FM) 3.0 (AM)

Output impedances FM: ro = 250 AM: ro = 10 k The separation can be adjusted by changing the value of the external capacitor connected between this pin and ground.

25

AM low cut

2.9 (FM) 3.0 (AM)

The low-band frequency characteristics of the AF demodulator can be adjusted by changing the value of the external capacitor connected between this pin and ground. The AM detector output can be attenuated by adding a resistor in series with the capacitor.

26

AMAGC

0 (FM) 0.5 (AM)

The internal load resistance, R is 6.7 k.

27

AM RF input

Vreg

Pin 27 must be used at the same voltage as pin 4, the regulator voltage.

Continued on next page. No. 4159-7/14

LA1835
Continued from preceding page.
No. Function Voltage Internal equivalent circuit Note

28

AFC

Vreg

The FM SD bandwidth can be adjusted by changing the value of the external resistor inserted between pin 28 and pin 4, the regulator voltage.

29

OSC

Vreg

The oscillator coil is connected between pin 29 and pin 4, the regulator voltage.

30

Oscillator buffer output Also functions as the FM SD sensitivity adjustment.

1.6 (FM) 1.3 (AM)

The FM SD sensitivity can be adjusted by changing the value of the external resistor inserted between this pin and ground. The AM SD sensitivity must be adjusted before the AM FD sensitivity. Output impedance ro = 200

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LA1835

No. 4159-9/14

LA1835

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LA1835

No. 4159-11/14

LA1835

No. 4159-12/14

LA1835

No. 4159-13/14

LA1835

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 and all SANYO products described or contained herein fall under strategic products (including services) controlled under the Foreign Exchange and Foreign Trade Control Law of Japan, such products must not be exported without obtaining export license from the Ministry of International Trade and Industry 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 August, 1998. Specifications and information herein are subject to change without notice. PS No. 4159-14/14