Monolithic Linear LA1837 Single-Chip Home Stereo with Electr

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Monolithic Linear LA1837 Single-Chip Home Stereo with Electr

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Ordering number EN5688
Monolithic Linear
LA1837
Single-Chip Home Stereo with Electronic Tuning Support
Overview
LA1837 single-chip AM/FM that supports electronic tuning developed home stereo systems. optimal automatic station selection systems that counting techniques.
Package Dimensions
unit: 3061-DIP30S
[LA1837]
Functions
amplifier, mixer, oscillator, amplifier, detector AGC, oscillator buffer, S-meter, narrowband buffer amplifier, quadrature detector, S-meter, Scurve detector, buffer output MPX: stereo decoder, stereo display, forced mono, stop, post amplifier, audio muting, adjacent channel interference rejection function
Features
On-chip external components required) Adjacent channel interference rejection function (third fifth order) Supports both counting techniques. sensitivities independently. output levels independently. Improved practical sensitivity high-input distortion characteristics
SANYO: DIP30S
Specifications
Maximum Ratings 25°C
Parameter Maximum supply voltage Allowable power dissipation Operating temperature Storage temperature Symbol Topr Tstg 70°C Conditions Ratings +125 Unit
Operating Conditions 25°C
Parameter Recommended supply voltage Operating voltage range Symbol Conditions Ratings Unit
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, Chome, Ueno, Taito-ku, TOKYO, JAPAN
82097HA(OT) 5688-1/9
LA1837 Electrical Characteristics 25°C, specified Test Circuit
Parameter Symbol Conditions Ratings Unit
Mono Characteristics] 10.7 MHz, kHz, with coil adjusted that VAFC VREG Current drain Demodulation output Channel balance Total harmonic distortion (mono) Total harmonic distortion (mono) Signal-to-noise ratio rejection ratio Limiting input voltage sensitivity bandwidth count buffer output S-meter output Muting attenuation ICCO-FM VOFM C.B-mono THDFM(1) THDFM(2) S/NFM dBL.S. SDOn-FM SDBW VIFBuff-FM VSM-FM(1) VSM-FM(2) Mute-Att dBµ. output dBµ. output dBµ. output dBµ, 100% mod. output With input dBµ, 100% mod. output dBµ, 100% mod. output/pin output dBµ, 100% mod. output dBµ, 200% mod. output dBµ, 100% mod. output dBµ, mod. output dBµ, 100% mod. Referenced output. input such that output down -1.5 1100 1460 +1.5 mVrms mVrms
Stereo Characteristics] 10.7 MHz, dBµ, kHz, 90%, Pilot Separation (left) Separation (right) Stereo level Stereo level Total harmonic distortion (main) SepL SepR STON STOFF THD-main Brej-3rd Adjacent channel interference rejection ratio Brej-5th Characteristics] 1000 kHz, Current drain Detector output ICCO-AM VOAM(1) VOAM(2) S/NAM(1) S/NAM(2) THDAM(1) THDAM(2) SDOn-AM VOSC-AM VIFBuff-AM VSTIF-AM VSM-AM With input. output dBµ, modulation. output dBµ, modulation. output dBµ, modulation. With input dBµ, mod. output dBµ, mod. output dBµ, mod. output dBµ, mod. output dBµ, mod. output dBµ, mod. output mVrms mVrms mVrms mVrms mVrms mod. output/pin output mod. output/pin output pilot modulation such that under pilot modulation such that over mod. output kHz, Pilot output mod. demodulated output kHz, Pilot output mod. demodulated output
Signal-to-noise ratio
Total harmonic distortion (mono) sensitivity Local oscillator buffer output counter buffer output ST-IF output S-meter output
Allowable power dissipation,
Ambient temperature, 5688-2/9
LA1837 Block Diagram
DECODER ANTI-BIRDIE
Test Circuit Diagram
5688-3/9
LA1837 Coil Specifications oscillator (for DUT) HW-50425 (Mitsumi Electric Co., Ltd.)
YD-1073-1 (Mitsumi Electric Co., Ltd.)
Includes internal 180-pF capacitor. SFU450B included.
detector 600BEAS-9715Z (The Toko Electric Corporation)
10.7 Includes internal 82-pF capacitor.
Functions
function voltage description Equivalent circuit
input
Vreg
Input impedance
mixer output
Connect mixer coil between this VCC.
input bypass
Vreg
Also functions regulator filter.
input
Vreg
Input impedance
AM-IF output
Active Open collector output stereo output (pin current input must exceed
detector
Recommended detector coil: 600BEAS9715Z (The Toko Electric Corporation)
Continued next page. 5688-4/9
LA1837
Continued from preceding page.
Function voltage description Recommended narrow band BFU450 (Murata Mfg. Co., Ltd.) narrow band connection narrow band used, bypass this circuit with resistor 0.047µF capacitor connected series. Equivalent circuit
S-meter output
S-meter output sensitivity adjustment (AM)
sensitivity adjusted with value external resistor connected between this ground.
Reception state buffer output, output control switch (mute switch) buffer output turned buffer output muting turned
Phase comparator low-pass filter (FM/AM switching)
Connecting this ground through resistor sets mode. (FM) (AM) Resistor value limits: (when current greater flows from this pin, system forced mono. Connecting this ground stops VCO. resistor limit values same
Pilot detector low-pass filter (forced mono) (VCO stop)
Post amplifier input output Vreg Vreg
Output impedance right output, left output Inverting inputs right input, left input
output
Output impedance right de-emphasis left de-emphasis
Continued next page.
5688-5/9
LA1837
Continued from preceding page.
Function voltage description Equivalent circuit
input
Input impedance
Output impedance demodulator output (FM) (AM) separation modified inserting capacitor between this ground. sub/VO main about
Output impedance detector output (FM) (AM) frequency characteristics modified adjusting time constants circuits between this between this ground.
(FM) (AM)
built-in load resistor
Vreg
bandwidth modified with external resistor connected between this
input
Vreg
this same potential
Vreg
Vreg
Vreg
oscillator coil between this
Oscillator buffer output, sensitivity adjustment
(FM) (AM)
sensitivity modified with external resistor connected between this ground. Output impedance
5688-6/9
LA1837
Overall Characteristics
Total harmonic distortion, S-meter output,
THD/VSM Characteristics THD/VSM Characteristics
Output
Input
Iinput
Band Characteristics
Total harmonic distortion, Total harmonic distortion, Frequency,
Distortion Frequency Characteristics
Frequency, freq
Separation Frequency Characteristics
Adjacent Channel Interference Rejection Ratio
Referenced demodulated output.
Separation
Frequency, freq
Vobat
Frequency,
Capture Range Characteristics
Sensitivity Adjustment Characteristics
Capture range
Pilot
Rsdadj
5688-7/9
LA1837
Sensitivity Adjustment Characteristics Overall Characteristics
Output
Radj
Output
Input
THD/VSM Characteristics
Total harmonic distortion,
Detector Output Frequency Characteristics
Output voltage, -dBV
S-meter output,
Input
Frequency,
Detector Output Frequency Characteristics
Distortion Ambient Temperature Characteristics
Total harmonic distortion,
Output voltage, -dBV
Frequency,
Ambient temperature,
Separation Ambient Temperature Characteristics
Separation,
Ambient temperature, 5688-8/9
LA1837
products described contained herein intended surgical implants, life-support systems, aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment like, failure which directly indirectly cause injury, death property loss. Anyone purchasing products described contained herein above-mentioned shall: Accept full responsibility indemnify defend SANYO ELECTRIC CO., LTD., affiliates, subsidiaries distributors their officers employees, jointly severally, against claims litigation damages, cost expenses associated with such use: impose responsibility fault negligence which cited such claim litigation SANYO ELECTRIC CO., LTD., affiliates, subsidiaries distributors their officers employees jointly severally. Information (including circuit diagrams circuit parameters) herein example only; guaranteed volume production. SANYO believes information herein accurate reliable, guarantees made implied regarding infringements intellectual property rights other rights third parties. This catalog provides information August, 1997. Specifications information herein subject change without notice. 5688-9/9

Monolithic Linear LA1837 Single-Chip Home Stereo with Electr

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