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Ordering number : EN5888
Monolithic linear IC
LA1838
Single-Chip Home Stereo IC with Electronic Tuning Support
Overview
The LA1838 is designed for use in home stereo systems and is a single-chip tuner IC that provides electronic tuning functions for AM, FM IF, and MPX reception. It is optimal for use in products that adopt an automatic tuning system based on an IF count.
Features
* Integrated MPX VCO (External components are no longer required.) * Built-in adjacent channel interference rejection function (third and fifth order) * Adjustment-free FM detector circuit (Uses a ceramic discriminator.) * The AM and FM SD sensitivities can be set independently. * The AM and FM output levels can be set independently. * Improved useable AM sensitivity and strong field distortion characteristics.
Functions
RF amplifier, mixer, oscillator, IF amplifier, detector, AGC, oscillator buffer, S-meter, narrow-band SD, IF buffer * FM IF: IF amplifier, quadrature detector, S-meter, SD (signal detection), S-curve detection, IF buffer output * MPX: PLL stereo decoder, stereo display, forced monaural, VCO stop, post amplifier, audio muting, adjacent channel interference rejection function
Allowable power dissipation, Pdmax -- mW
600 550 500
* AM:
Package Dimensions
unit: mm 3061-DIP30S
[LA1838]
30 16
Pd max - Ta
10.16 8.6
400
1
27.2
15
1.15
1.78
0.48
0.95
100
SANYO: DIP30S
0 -40 -20 0 20 40 60 80 100
Ambient temperature, Ta --C
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 Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
40999RM (OT) No. 5888-1/9
3.2
200
0.51min
4.25
300
4.95max
0.25
LA1838
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 supply voltage range Symbol VCC VCCop Conditions Ratings 9 7 to 11 Unit V V
Operating 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 Current drain Demodulator output Channel balance Total harmonic distortion (mono) Signal-to-noise ratio AM rejection ratio Input limiting voltage LED indicator on sensitivity LED indicator on bandwidth IF counter buffer output S-meter output Mute attenuation ICCO-FM VOFM With no input signal 100 dB, 100% modulation, the pin 16 output 18 730 -1.5 31 1100 0 0.3 70 40 26 47 100 dB 100 dB, the pin 13 output 0 dB, the pin 11 output 100 dB, the pin 11 output 100 dB, 100% modulation, the pin 16 output 130 80 0 3.6 75 77 55 32 57 210 120 0.1 4.3 85 38 67 300 160 0.5 5.0 44 1460 +1.5 1.5 mA mVrms dB % dB dB dB dB kHz mVrms V V dB
100 dB, 100% modulation, the pin 16 output/the C.B-mono pin 17 output THDFM S/NFM AMR -3dBL.S SDOn-FM SDBW VIFBuff-FM VSM-FM1 VSM-FM2 Mute-Att 100 dB, 100% modulation, the pin 16 output 100 dB, 100% modulation, the pin 16 output 100 dB, AM 30% modulation, the pin 16 output 100 dB, 100% modulation, referenced to the output, the input when the output is down by -3 dB
[FM Stereo Characteristics] fc = 10.7 MHz, fm = 1 kHz, L + R = 90%, Pilot = 10%, 100 dB Separation (left) Separation (right) Stereo on level Stereo off level Total harmonic distortion (main) SepL SepR STON STOFF Left channel modulated. The pin 16 output/the pin 17 output Right channel modulated. The pin 17 output/the pin 16 output The pilot modulation such that V7 falls under 0.7 V The pilot modulation such that V7 rises to over 4.5 V 30 30 1.3 45 45 2.7 1.5 0.3 40 1.5 5 dB dB % % % dB
THD-main Left + right modulation. The pin 16 output. Brej-3rd fs = 113 kHz, Vs = 90%, pilot = 10% The left - right modulation 1 kHz demodulated output with respect to the pin 16 output fs = 189 kHz, Vs = 90%, pilot = 10% The left - right modulation 1 kHz demodulated output with respect to the pin 16 output
Adjacent channel rejection ratio Brej-5th [AM Characteristics] fc = 1000 kHz, fm = 1 kHz Current drain Detector output ICCO-AM VOAM1 VOAM2 S/NAM1 S/NAM2 THDAM1 THDAM2 SDOn-AM VOSC-AM VIFBuff-AM VSTIF-AM VSM-AM
40
dB
With no input signal 23 dB, 30% modulation, the pin 16 output 80 dB, 30% modulation, the pin 16 output 23 dB, 30% modulation, the pin 16 output 80 dB, 30% modulation, the pin 16 output 80 dB, 30% modulation, the pin 16 output 80 dB, 80% modulation, the pin 16 output
15 100 200 18 49
25 180 320 22 55 0.4 1.0
35 360 500
mA mVrms mVrms dB dB
Signal-to-noise ratio
Total harmonic distortion LED indicator on sensitivity Local oscillator buffer output IF counter buffer output ST - IF output S-meter output
1.2 4.0 37 220 300 48 0.2
% % dB mVrms mVrms mVrms V
17 With no input signal, the pin 30 output 80 dB, 100% modulation, the pin 13 output 80 dB, 100% modulation, the pin 7 output 0 dB, 100% modulation 110 160 16 0
27 160 220 34 0
No. 5888-2/9
LA1838 Block Diagram
OSC BUFF FM SD ADJ
VT OSC
FM SD BAND-W AM AGC L.P.F L.P.F +
AM-STEREO L / R- INPUT L R +
30
29
28 REG
27
RF
+
+
+
+
L-OUT R-OUT
26
25
24
23
22
21
20
19
18
17
16
ALC BUFF
AM OSC
AM MIX
AM RF.AMP P-DET AGC AM I F DET
DECODER ANTI- BIRDIE STEREO SW MUTE
SD COMP AM S-METER FM AM/FM S-METER S-CURVE I F-BUFF FM DET GND 1 2 AM IFT FM IN (10.7MHz) + 3 4 5 TU- LED 6 ST- LED 7 TUNING DRIVE STEREO DRIVE
VCO 304kHz
FF 38k
FF 19k2
FF 19k
PILOT DET
FM I F
VCC 8 + AM- IF 9 10 AM NARROW SD 11 12 FM VSM AM VSM (SD-ADJ) + AM/FM IF-BUFF MUTE + + AM MONO VCC
T00147
13
14
15 FM ST
AC Test Circuit
50
AM -IN (1MHz) OSC BUFF (1.45MHz) 1000pF 39pF 20pF
0.047F REG
AFC 0.047F 39mH 3k 18k 0.01F 0.033F 0.033F 10F + + L.P.F L.P.F 3.3k 10F + 3.3k 10F 17 L-OUT R-OUT
5.1k
0.047F
3.3F
33F
+ 28
+ 26
22F
+ 25 24
30
29
27
1000pF 23
T1
OSC
22
21
20
19
18
16
LA1838
1 FM IN (10.7MHz) 75 300 T2 0.047F 2 450kHz 68k 0.047F 47F + 3 4 5 6 SD 1000pF 7 ST 68k 0.047F + 8 330 9 10 51 3k IF - BUFF 0.047F ( ) 0.047F 11 FM 12 AM + 1F 10k 13 SEEK1000pF 14 15 FM 0.47F AM STEREO 1F VCC 9.0V
T00148
10F 5k
*
5k MONO
VSM VSM
+ 5k
AM - ST
NORMAL
CDA10.7MGI-C (For use as the DUT socket board)
T1: HW-50425 T2: YD-1073-1
The CDA10.7MG74 must be used for actual production models. (Series resistance: 270 )
1F
VDD
+
+
No. 5888-3/9
LA1838 Coil Specifications * AM oscillator (for the DUT) HW-50425 (Mitsumi)
3 2 1 6
A10633
* IFT YD-1073-1 (Mitsumi)
3 S 4
4
- - -x
QO 80
2T 9T 86T
2 1 S 6 SFU450B
A10634
-x - -
58T 7T 94T
fO = 450 kHz QO = 110 A 180-pF capacitor is built in With an external SFU450B
L = 270 H
YD-1073
Pin Functions
Pin No. Pin function Pin voltage Notes Equivalent circuit
1
1
FM IF input
Vreg
Input impedance ri = 330
3
A10635
2
2
AM mixer output
VCC
Connect the mixer coil between this pin and VCC
A10636
1
3
FM IF input bypass
Vreg
Also used for the MPX regulator filter
3
A10635
4
4
AM IF input
Vreg
Input impedance ri = 2 k
A10637
5
GND
0V Active low Open collector AM stereo IF output (pin 7) The influx current must be held under 150 A.
A10638
6
7
TU-LED 6 7 ST-LED, AF-IF output
VCC VCC
8
VCC
VCC
28
9
FM detector
Vreg - 1.4
The CDA10.7 MG74 (Murata Mfg. Co., Ltd.) is recommended as the ceramic discriminator. A device with a series resistance of 270 must be used.
9
A10639
Continued on next page.
No. 5888-4/9
LA1838 Continued from preceding page.
Pin No. Pin function Pin voltage Notes Recommended narrow band CF: BFU450 C4N (Murata Mfg. Co., Ltd.) 1.3 V When the narrow band SD function is not used, bypass this circuit with a 50 resistor and a 0.047 F capacitor in series.
10
Equivalent circuit
10
AM narrow band CF connection
A10640
11
FM S-meter output
0V
RL = 8 k
11
A10641
12
AM S-meter output
0 V (AM)
The AM SD sensitivity is adjusted with an external resistor connected between this pin and ground
12 28
A10642
AM/FM IF buffer output, 13 Output control switch (mute switch) 0V
V13 0.5 V: Reception state 1.4 V V13 2.2 V: IF buffer output on V13 3.5 V: IF buffer output and muting on
A10643
13
14
Phase comparator low-pass filter (AM/FM switching)
The device operates in AM mode when this pin is connected to ground through a resistor. VCC - 1.4 (FM) 0 V (AM) Limit values for the resistor: 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) The device is forced to monaural when a current of over 50 A flows from this pin.
14
A10644
15
Pilot detector lowpass filter (Forced mono) (VCO stop)
VCC - 1.0
The VCO is stopped if this pin is connected to ground. The limit values for the resistor are the same as those for pin 14. Output impedance ro = 200 Pin 16: Right output, pin 17: Left output
15
A10645
16 17 18 19 Post-amplifier inputs and outputs Vreg Vreg
Inverting input pins Pin 18: Right input, pin 19: Left input RNF = 33 k
18 19
16 17
A10646
20 21
MPS outputs
3.5 V 3.5 V
Output impedance ro = 3.3 k Pin 20: Right deemphasis Pin 21: Left deemphasis
20 21
A10647
Continued on next page.
No. 5888-5/9
LA1838 Continued from preceding page.
Pin No. Pin function Pin voltage Notes Equivalent circuit
22
22
MPX input
2.9 V
Input impedance ri = 20 k
A10648
Output impedance ro = 3.0 k 23 FM demodulator output 2.8 V (FM) 2.8 V (AM) The channel separation can be adjusted with an external capacitor connected between this pin and ground. The VO sub/VO main ratio is set to be about 0 dB.
23
A10649
Output impedance ro = 3.3 k 24 AM detector output 0 V (FM) 0.5 V (AM) The AM frequency characteristics can be adjusted by modifying the time constant of the circuit connected between this pin and pin 22 and between this pin and ground.
24
A10650
25
AM AGC
0 V (FM) 0.5 V (AM)
The resistance of the built-in resistor R is 11 k
25
A10651
26
AFC
Vreg
The FM SD bandwidth can be adjusted with the external resistor connected between this pin and pin 28
26
A10652
27
AM RF input
Vreg
Must be used at the same potential as pin 28
27
A10653
28
28
REG
Vreg
Vreg = 3.6 V
A10654
29
29
OSC
Vreg
Connect the oscillator coil between this pin and pin 28
A10655
30
Oscillator buffer output, FM SD sensitivity adjustment
1.6 V (FM) 1.3 V (AM)
The FM SD sensitivity can be adjusted with an external resistor connected between this pin and ground. Output impedance ro = 200
30
A10656
No. 5888-6/9
LA1838 Overall FM Characteristics
Out
10 0 -10 -20
5
FM THD and VSM Characteristics
VSM
Total harmonic distortion, THD -- %, S-meter output, VSM -- V
4
Output, -- dBm
-30 -40 -50 -60 -70 AMOut Noise
3
2
V =9V -80 f CC10.7 MHz c= fm = 1 kHz,75 kHzdev -90 AM = 30% mod -100 0 20 40
1 THD 0 0 10 20 30 40 50 60 70 80 90 100 110 120
60
80
100
120
Input, -- dB
5.0
Input, -- dB
10 7 5 3 2 1.0 7 5 3 2 0.1 7 5 3 2 23 5 7 0.1 23 5 7 1.0 2 3 5 7 10 23
ON O
FM THD vs. Band Characteristics
Total harmonic distortion, THD -- %
VCC = 9 V VIN = 100 dB fm = 1 kHz, 75 kHzdev
Distortion vs. Frequency Characteristics
SUB
Total harmonic distortion, THD -- %
4.0
2.0
1.0
0 10.60 10.62 10.64 10.66 10.68 10.70 10.72 10.74 10.76 10.78 10.80
0.01 0.01
Frequency, fc -- MH
50 45
Frequency, freq -- kHz
IF = 10.7 MHz, 100 dB, 75 kHzdev -10 VS = 90% PILOT = 10% LA1836 -20 Referenced to the L-R demodulated output 0
Separation vs. Frequency Characteristics
-R Sep
Adjacent Channel Rejection Ratio
Channel separation, Sep -- dB
40 35 30 25 20 15 10 5 0 0.01 23
Sep -L
Vobat -- dB
-30 -40 -50 -60 -70 -80 LA1838
5 7 0.1
23
5 7 1.0
23
5 7 10
2
-90 70
90
110
130
150
170
190
210
M
AM
3.0
MAIN
ST
230
30
Frequency, freq -- kHz
6 4 70
Frequency, fs -- kHz
90 80
Capture Range Characteristics
CR+
SD Sensitivity Adjustment
12
Capture range -- %
SD on -- dB
2
60 50 40 30 20 AM FM
AM FM
0
-2
-4
CR-6 10 20 30 40
10 0 0 2 4 6 8 10 12 14 16
Pilot -- mV
Rsdadj -- k No. 5888-7/9
LA1838 SD Band Adjustment Characteristics Overall AM Characteristics
Out
350 300 250
0 -10 -20
Output, -- dBm
SD BW -- kHz
-30 -40 -50 -60 -70 VCC = 9 V fc = 1 MHz fm = 1 kHz,30%mod -80 -20 0 20 40 Noise
200 150 100 50 0 0 2 4 6 8 10 12 14 16 18 20
60
80
100
120
140
Radj -- k
5.0
Input, -- dB
0 -5
AM THD and VSM Characteristics
AM Detector Output Frequency Characteristics (1)
24
Total harmonic distortion, THD -- % S-meter output, VSM -- V
Output voltage, VO -- dBV
VCC = 9 V 4.5 fc = 1 MHz fm = 1 kHz, 30%mod 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 -20 0 20 THD = 30%mod 40 60 80 100 120 140 THD = 80%mod VSM
R C
22
-10 -15 -20 -25 -30 -35 -40 0.01
C
5 7 0.1
=0
.04
C =0 C= 0. . 02 7 01
2
23
23
5 7 1.0
23
5 7 10
2
Input, -- dB
0 -5
Frequency, fm -- kHz
1.0
AM Detector Output Frequency Characteristics (2)
24
Distortion vs. Ambient Temperature Characteristics
Output voltage, VO -- dBV
R = 10 k -10 -15 -20 -25 -30 -35 -40 0.01 2 3 5 7 0.1 23 5 7 1.0 23 R = 33 k R = 18 k
22 0.01 F
Total harmonic distortion, THD -- %
R
7 5
3
THD sub THD Mono
2 THD st THD Main
5 7 10
2
0.1 -40
-20
0
20
40
60
80
100
Frequency, fm -- kHz
90 80
Ambient temperature, Ta -- C
Separation vs. Ambient Temperature Characteristics
S/N Mono S/N Stereo Sep- R
Channel separation, Sep -- dB
70 60 50 40 30 20 10 0 -40 -20 0
Sep- L
20
40
60
80
100
Ambient temperature, Ta -- C No. 5888-8/9
LA1838
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.
This catalog provides information as of April, 1999. Specifications and information herein are subject to change without notice. No. 5888-9/9

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