Sanyo LA1835 Specifications

Ordering number : EN4159B

11795TH (OT) No. 4159-1/14

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.

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

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

• Support for AM low band cut control

• Adjustable AM stop sensitivity

Package Dimensions

unit: mm

3196-DIP30SD

SANYO: DIP30SD

[LA1835]

LA1835

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN

Home Stereo Single-Chip Tuner IC

with Electronic Tuning Support

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.

Specifications

Maximum Ratings at Ta = 25°C

Operating Conditions at Ta = 25°C

Operating Characteristics

at Ta = 25°C, VCC= 7.0 V, in the specified test circuit using the IC59-3004 socket (Yamaichi Electric Co., Ltd.)

No. 4159-2/14

LA1835

Parameter Symbol Conditions Ratings Unit

Recommended supply voltage V

7.0 V

Operating supply voltage V

op 6.5 to 8.5 V

Parameter Symbol Conditions min typ max Unit [FM Characteristics (mono): fc = 10.7 MHz, fm = 1 kHz] Quiescent current I

CCO-FM

No input 23 37 46 mA

Demodulator output V

O-FM

100 dBµ, 100% modulation, the pin 16 output 665 1000 1330 mVrms Channel balance (monaural) C. B-momo 100 dBµ, 100% modulation, pin 16 output/pin 17 output –1.5 0 +1.5 dB Total harmonic distortion THD-

100 dBµ, 100% modulation, the pin 16 output 0.3 1.5 % Signal-to-noise ratio S/N-

100 dBµ, 100% modulation, the pin 16 output 67 74 dB AM suppression ratio AMR 100 dBµ, 30% AM modulation, the pin 16 output 35 50 dB Input limiting voltage –3dBL.S 100 dBµ, referenced to 100%, with the input down 3 dB 27 35 dBµ SD indicator sensitivity SD-on-

47 57 67 dBµ

SD indicator bandwidth SD-

100 dBµ 120 190 280 kHz IF counter buffer output V

IF Buff-FM

100 dBµ, the pin 11 output 80 120 160 mVrms

SM-FM

(1) 0 dBµ, the pin 12 output 0 0.3 1.0 V

S-meter output V

SM-FM

(2) 60 dBµ, the pin 12 output 0.7 1.5 2.5 V

SM-FM

(3) 100 dBµ, the pin 12 output 2.5 4.0 5.0 V Muting attenuation Mute-Att 100 dBµ, 100% modulation, the pin 16 output 80 95 dB [FM Characteristics (stereo): fc = 10.7 MHz, fm = 1 kHz, L + R = 90%, pilot = 10%, V

= 100 dBµ] Separation-left Sep-L Left channel modulated; pin 17 output/pin 16 output 30 45 dB Separation-right Sep-R Right channel modulated; pin 16 output/pin 17 output 30 45 dB Stereo on level ST-on The pilot modulation such that V7 < 0.7 V 1.8 3.6 6.0 % Stereo off level ST-off The pilot modulation such that V7 > 4.5 V 2.5 % Total harmonic distortion (main) THD-main The pin 16 output 0.3 1.5 % Channel balance (main) C. B-main Pin 16 output/pin 17 output –1.5 0 +1.5 dB Capture range C. R. Pilot = 10% ±1.5 % Adjacent channel rejection ratio B. Rej fs = 113 kHz, VS = 90%, pilot = 10%, the pin 16 output 40 dB [AM Characteristics: fc = 1000 kHz, fm = 1 kHz] Quiescent current I

CCO-AM

No input 21 29 42 mA

Detector output

O-AM

(1) 23 dBµ, 30% modulation, the pin 16 output 25 45 90 mVrms

O-AM

(2) 80 dBµ, 30% modulation, the pin 16 output 195 310 490 mVrms

Signal-to-noise ratio

S/N-

(1) 23 dBµ, 30% modulation, the pin 16 output 16 20 dB

S/N-

(2) 80 dBµ, 30% modulation, the pin 16 output 48 54 dB

THD-

(1) 80 dBµ, 30% modulation, the pin 16 output 0.3 1.0 %

Total harmonic distortion THD-

(2) 100 dBµ, 30% modulation, the pin 16 output 0.4 1.2 %

THD-

(3) 80 dBµ, 80% modulation, the pin 16 output 1.0 4.0 %

SD indicator sensitivity SD-on-

20 30 40 dBµ

Local oscillator buffer output V

OSC-AM

No input, the pin 30 output 110 160 mVrms Low-band attenuation Low-Cut The output for fm = 100 Hz referenced to fm = 1 kHz 5.0 7.0 11.0 dB IF counter buffer output V

IF Buff-AM

80 dBµ, unmodulated signal, the pin 11 output 140 200 280 mVrms Stereo IF output V

STIF-AM

80 dBµ, unmodulated signal, the pin 8 output 8.0 17.0 24.0 mVrms

S-meter output

SM-AM

(1) 0 dBµ, unmodulated signal 0 0 0.2 V

SM-AM

(2) 40 dBµ, unmodulated signal 1.3 3.0 4.5 V

Parameter Symbol Conditions Ratings Unit

Maximum supply voltage V

max 9.0 V Allowable power dissipation Pd max Ta ≤ 70°C 550 mA Operating temperature Topr –20 to +70 °C Storage temperature Tstg –40 to +125 °C

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. 4159-5/14

LA1835

No. Function Voltage Internal equivalent circuit Note

7 8

FM IF input

AM mixer output

FM IF input bypass

REG

AM IF input

GND

Tu-LED ST-LED Also functions as the

AM IF output.

FM detector

Vreg

2.1 (FM)

2.7 (AM)

Input impedance: ri = 330 Ω

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

Also used for the AF noise filter.

Vreg = 3.6 V

Input impedance: ri = 2 kΩ

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

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

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