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Ordering number : EN5688
Monolithic Linear IC
LA1837
Single-Chip Home Stereo IC with Electronic Tuning Support
Overview
The LA1837 is a single-chip AM/FM IF and MPX IC that supports electronic tuning and was developed for use in home stereo systems. It is optimal for use in automatic station selection systems that use the SD and IF counting techniques.
Package Dimensions
unit: mm 3061-DIP30S
[LA1837]
Functions
RF amplifier, mixer, oscillator, IF amplifier, detector AGC, oscillator buffer, S-meter, narrowband SD, IF buffer FM IF: IF amplifier, quadrature detector, S-meter, Scurve detector, IF buffer output MPX: PLL stereo decoder, stereo display, forced mono, VCO stop, post amplifier, audio muting, adjacent channel interference rejection function AM:
Features
* On-chip MPX VCO (no external components required) * Adjacent channel interference rejection function (third and fifth order) * Supports both the SD and the IF counting techniques. * The AM and FM SD sensitivities can be set independently. * The AM and FM output levels can be set independently. * Improved AM practical sensitivity and high-input distortion characteristics
SANYO: DIP30S
Specifications
Maximum Ratings at Ta = 25C
Parameter Maximum supply voltage Allowable power dissipation Operating temperature Storage temperature Symbol VCC max Pd max Topr Tstg Ta 70C Conditions Ratings 12 550 -20 to + 70 -40 to +125 Unit V mW C C
Operating Conditions at Ta = 25C
Parameter Recommended supply voltage Operating voltage range Symbol VCC VCC op Conditions Ratings 9 7 to 11 Unit V V
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
82097HA(OT) No. 5688-1/9
LA1837 Electrical Characteristics at Ta = 25C, VCC = 9 V, in the specified Test Circuit
Parameter Symbol Conditions Ratings min typ max Unit
[FM Mono Characteristics] fc = 10.7 MHz, fm = 1 kHz, with the coil adjusted so that VAFC - VREG = 0 V Current drain Demodulation output Channel balance Total harmonic distortion (mono) Total harmonic distortion (mono) Signal-to-noise ratio AM rejection ratio Limiting input voltage LED sensitivity LED bandwidth IF count buffer output S-meter output Muting attenuation ICCO-FM VOFM C.B-mono THDFM(1) THDFM(2) S/NFM AMR -3 dBL.S. SDOn-FM SDBW VIFBuff-FM VSM-FM(1) VSM-FM(2) Mute-Att 100 dB 100 dB. The pin 13 output 0 dB. The pin 11 output 100 dB. The pin 11 output 100 dB, 100% mod. The pin 16 output With no input 100 dB, 100% mod. The pin 16 output 100 dB, 100% mod. The pin 16 output/pin 17 output 100 dB, 100% mod. The pin 16 output 100 dB, 200% mod. The pin 16 output 100 dB, 100% mod. The pin 16 output 100 dB, AM 30 % mod. The pin 16 output 100 dB, 100% mod. Referenced to the output. The input such that the output is down -3 dB. 72 45 26 51 85 80 0 3.6 75 18 730 -1.5 31 1100 0 0.3 1.0 80 65 32 60 120 120 0.1 4.3 85 38 69 170 160 0.5 5.0 44 1460 +1.5 1.3 5 mA mVrms dB % % dB dB dB dB kHz mVrms V V dB
[FM Stereo Characteristics] fc = 10.7 MHz, 100 dB, fm = 1 kHz, L + R = 90%, Pilot = 10% Separation (left) Separation (right) Stereo on level Stereo off level Total harmonic distortion (main) SepL SepR STON STOFF THD-main Brej-3rd Adjacent channel interference rejection ratio Brej-5th [AM Characteristics] fc = 1000 kHz, fm = 1 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 no input. The pin 30 output 80 dB, no modulation. The pin 13 output 80 dB, no modulation. The pin 7 output 0 dB, no modulation. With no input 23 dB, 30% mod. The pin 16 output 80 dB, 30% mod. The pin 16 output 23 dB, 30% mod. The pin 16 output 80 dB, 30% mod. The pin 16 output 80 dB, 30% mod. The pin 16 output 80 dB, 80% mod. The pin 16 output 17 110 160 16 0 15 100 200 18 49 25 180 320 22 55 0.4 1.0 27 160 220 34 0 1.2 4.0 37 220 300 48 0.2 35 360 500 mA mVrms mVrms dB dB % % dB mVrms mVrms mVrms V L mod. The pin 16 output/pin 17 output R mod. The pin 17 output/pin 16 output The pilot modulation such that V7 is under 0.7 V. The pilot modulation such that V7 is over 4.5 V. L+R mod. The pin 16 output fs = 113 kHz, Vs = 90 %, Pilot = 10 %, The pin 16 output vs. the L-R mod. 1 kHz demodulated output fs = 189 kHz, Vs = 90 %, Pilot = 10 %, The pin 16 output vs. the L-R mod. 1 kHz demodulated output 30 30 1.3 45 45 2.7 1.5 0.3 40 1.3 5 dB dB % % % dB
40
dB
Signal-to-noise ratio
Total harmonic distortion (mono) LED sensitivity Local oscillator buffer output IF counter buffer output ST-IF output S-meter output
Pd max - Ta
Allowable power dissipation, Pd max - mW
Ambient temperature, Ta - C No. 5688-2/9
LA1837 Block Diagram
FM SD ADJ
3 rd 5 th DECODER ANTI-BIRDIE
Test Circuit Diagram
FM
No. 5688-3/9
LA1837 Coil Specifications * AM oscillator (for the DUT) HW-50425 (Mitsumi Electric Co., Ltd.)
- - - QO 80 L = 270 H 2T 9T 86T
* IFT YD-1073-1 (Mitsumi Electric Co., Ltd.)
- - - 58T 7T 94T
fO = 450 kHz QO = 110 Includes an internal 180-pF capacitor. SFU450B included.
* FM detector 600BEAS-9715Z (The Toko Electric Corporation)
- 22T
f = 10.7 MHz QO = 40 Includes an internal 82-pF capacitor.
Pin Functions
Pin No. Pin function Pin voltage (V) Pin description Equivalent circuit
1
FM IF input
Vreg
Input impedance ri = 330
2
AM mixer output
VCC
Connect the mixer coil between this pin and VCC.
3
FM IF input bypass
Vreg
Also functions as the MPX regulator filter.
See pin 1.
4
AM IF input
Vreg
Input impedance ri = 2 k
5
GND
0V
6 7
TU - LED ST - LED AM-IF output
VCC VCC
Active low Open collector output AM stereo IF output (pin 7) The current input must not exceed 150 A.
8
VCC
VCC
9
FM detector
VCC
Recommended detector coil: 600BEAS9715Z (The Toko Electric Corporation)
Continued on next page. No. 5688-4/9
LA1837
Continued from preceding page.
Pin No. Pin Function Pin voltage (V) Pin description Recommended narrow band CF: BFU450 C4N (Murata Mfg. Co., Ltd.) 10 AM narrow band CF connection 1.3 V If the narrow band SD is not used, bypass this circuit with a 50- resistor and a 0.047F capacitor connected in series. Equivalent circuit
11
FM S-meter output
0V
RL = 8 k
AM S-meter output 12 AM SD sensitivity adjustment 0 V (AM)
The AM SD sensitivity is adjusted with the value of the external resistor connected between this pin and ground.
V13 0.5 V: Reception state 13 AM and FM IF buffer output, output control switch (mute switch) 0V 1.4 V V13 2.2 V: IF buffer output turned on V13 3.5 V: IF buffer output and muting are turned on
Phase comparator 14 low-pass filter (FM/AM switching)
Connecting this pin to ground through a resistor sets the IC to AM mode. VCC - 1.4 (FM) 0 V (AM) Resistor value limits: 2.7 k (when VCC = 7 V) 3.9 k (8 V) 5.1 k (9 V) 6.2 k (10 V) 7.5 k (11 V) If a current of 50 A or greater flows from this pin, the system is forced to mono. VCC - 1.0 Connecting this pin to ground stops the VCO. The resistor limit values are the same as for pin 14.
Pilot detector low-pass 15 filter (forced mono) (VCO stop)
16 17 18 19 Post amplifier input and output Vreg Vreg
Output impedance ro = 200 Pin 16: right output, pin 17: left output Inverting inputs Pin 18: right input, pin 19: left input RNF = 33 k
20 21
MPX output
3.5 V 3.5 V
Output impedance ro = 3.3 k Pin 20: right de-emphasis Pin 21: left de-emphasis
Continued on next page.
No. 5688-5/9
LA1837
Continued from preceding page.
Pin No. Pin Function Pin voltage (V) Pin description Equivalent circuit
22
MPX input
2.9 V
Input impedance ri = 20 k
Output impedance ro = 3.0 k 23 FM demodulator output 2.8 V (FM) 2.8 V (AM) The separation can be modified by inserting a capacitor between this pin and ground. Set VO sub/VO main to be about 0 dB.
Output impedance ro = 3.3 k 24 AM detector output 0 V (FM) 0.5 V (AM) The AM frequency characteristics can be modified by adjusting the time constants of the circuits between this pin and pin 22, and between this pin and ground.
25
AM AGC
0 V (FM) 0.5 V (AM)
The built-in load resistor R = 11 k.
26
AFC
Vreg
The FM SD bandwidth can be modified with the external resistor connected between this pin and pin 28.
27
AM RF input
Vreg
Use this pin at the same potential as pin 28.
28
REG
Vreg
Vreg = 3.6 V
29
OSC
Vreg
Use an oscillator coil between this pin and pin 28.
30
Oscillator buffer output, FM SD sensitivity adjustment
1.6 V (FM) 1.3 V (AM)
The FM SD sensitivity can be modified with the external resistor connected between this pin and ground. Output impedance ro = 20
No. 5688-6/9
LA1837
Overall FM Characteristics
Total harmonic distortion, THD - % S-meter output, VSM - V
FM THD/VSM Characteristics THD/VSM Characteristics
Output - dBm
Input - dB
Iinput - dB
FM THD Band Characteristics
Total harmonic distortion, THD - % Total harmonic distortion, THD - % Frequency, fC - MHz
Distortion vs. Frequency Characteristics
Frequency, freq - kHz
Separation vs. Frequency Characteristics
Adjacent Channel Interference Rejection Ratio
Referenced to the L-R demodulated output.
Separation - dB
Frequency, freq - kHz
Vobat - dB
Frequency, fS - Hz
Capture Range Characteristics
SD Sensitivity Adjustment Characteristics
Capture range - %
Pilot - mV
SD on - dB
Rsdadj - k
No. 5688-7/9
LA1837
SD Sensitivity Adjustment Characteristics Overall AM Characteristics
Output
SD BW - kHz
Radj - k
Output - dBm
Input - dB
AM THD/VSM Characteristics
Total harmonic distortion, THD - %
AM Detector Output Frequency Characteristics (1)
Output voltage, VO -dBV
S-meter output, VSM - V
Input - dB
Frequency, fm - kHz
AM Detector Output Frequency Characteristics (2)
Distortion vs. Ambient Temperature Characteristics
Total harmonic distortion, THD - %
Output voltage, VO -dBV
Frequency, fm - kHz
Ambient temperature, Ta - C
Separation vs. Ambient Temperature Characteristics
Separation, Sep - dB
S/N - dB
Ambient temperature, Ta - C No. 5688-8/9
LA1837
s No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or indirectly cause injury, death or property loss. s Anyone purchasing any products described or contained herein for an above-mentioned use shall: Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and expenses associated with such use: Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally. s 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, 1997. Specifications and information herein are subject to change without notice. No. 5688-9/9

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