SANYO LA1838

Ordering number : EN5888
Monolithic linear IC
LA1838
Single-Chip Home Stereo IC with Electronic
Tuning Support
Overview
Features
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.
• 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
Package Dimensions
unit: mm
3061-DIP30S
[LA1838]
30
Pd max - Ta
600
16
10.16
8.6
550
0.25
500
1
400
15
4.25
200
1.15
1.78
0.48
3.2
300
4.95max
27.2
0.51min
Allowable power dissipation, Pdmax — mW
• AM:
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
LA1838
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Symbol
Maximum supply voltage
Conditions
Ratings
VCC max
Allowable power dissipation
Pd max
Ta ≤ 70°C
Unit
12
V
550
mW
Operating temperature
Topr
–20 to +70
°C
Storage temperature
Tstg
–40 to +125
°C
Operating Conditions at Ta = 25°C
Parameter
Symbol
Recommended supply voltage
VCC
Operating supply voltage range
VCCop
Conditions
Ratings
Unit
9
V
7 to 11
V
Operating Characteristics at Ta = 25°C, VCC = 9 V, in the specified test circuit.
Parameter
Symbol
Conditions
Ratings
min
typ
Unit
max
[FM Mono Characteristics] fc = 10.7 MHz, fm = 1 kHz
Current drain
Demodulator output
Channel balance
ICCO-FM
VOFM
With no input signal
100 dBµ, 100% modulation, the pin 16 output
100 dBµ, 100% modulation, the pin 16 output/the
C.B-mono pin 17 output
18
31
44
730
1100
1460
mVrms
mA
–1.5
0
+1.5
dB
0.3
1.5
Total harmonic distortion (mono)
THDFM
100 dBµ, 100% modulation, the pin 16 output
Signal-to-noise ratio
S/NFM
100 dBµ, 100% modulation, the pin 16 output
70
77
dB
100 dBµ, AM 30% modulation, the pin 16 output
40
55
dB
100 dBµ, 100% modulation, referenced to the output,
the input when the output is down by –3 dB
26
32
AM rejection ratio
AMR
Input limiting voltage
–3dBL.S
LED indicator on sensitivity
SDOn-FM
LED indicator on bandwidth
SDBW
IF counter buffer output
S-meter output
Mute attenuation
100 dBµ
%
38
dBµ
dBµ
47
57
67
130
210
300
kHz
80
120
160
mVrms
V
VIFBuff-FM
100 dBµ, the pin 13 output
VSM-FM1
0 dBµ, the pin 11 output
0
0.1
0.5
VSM-FM2
100 dBµ, the pin 11 output
3.6
4.3
5.0
Mute-Att
100 dBµ, 100% modulation, the pin 16 output
75
85
dB
dB
V
[FM Stereo Characteristics] fc = 10.7 MHz, fm = 1 kHz, L + R = 90%, Pilot = 10%, 100 dBµ
Separation (left)
SepL
Left channel modulated. The pin 16 output/the pin 17 output
30
45
Separation (right)
SepR
Right channel modulated. The pin 17 output/the pin 16 output
30
45
Stereo on level
STON
The pilot modulation such that V7 falls under 0.7 V
1.3
2.7
Stereo off level
STOFF
The pilot modulation such that V7 rises to over 4.5 V
Total harmonic distortion (main)
dB
5
1.5
THD-main Left + right modulation. The pin 16 output.
0.3
%
%
1.5
%
Brej-3rd
fs = 113 kHz, Vs = 90%, pilot = 10%
The left - right modulation 1 kHz demodulated output
with respect to the pin 16 output
40
dB
Brej-5th
fs = 189 kHz, Vs = 90%, pilot = 10%
The left - right modulation 1 kHz demodulated output
with respect to the pin 16 output
40
dB
Adjacent channel rejection ratio
[AM Characteristics] fc = 1000 kHz, fm = 1 kHz
Current drain
Detector output
Signal-to-noise ratio
Total harmonic distortion
LED indicator on sensitivity
ICCO-AM
With no input signal
15
25
35
mA
VOAM1
23 dBµ, 30% modulation, the pin 16 output
100
180
360
mVrms
500
mVrms
VOAM2
80 dBµ, 30% modulation, the pin 16 output
200
320
S/NAM1
23 dBµ, 30% modulation, the pin 16 output
18
22
S/NAM2
80 dBµ, 30% modulation, the pin 16 output
49
55
THDAM1
80 dBµ, 30% modulation, the pin 16 output
0.4
1.2
THDAM2
80 dBµ, 80% modulation, the pin 16 output
1.0
4.0
%
17
27
37
dBµ
SDOn-AM
dB
dB
%
Local oscillator buffer output
VOSC-AM
With no input signal, the pin 30 output
110
160
220
mVrms
IF counter buffer output
VIFBuff-AM
80 dBµ, 100% modulation, the pin 13 output
160
220
300
mVrms
ST - IF output
VSTIF-AM
80 dBµ, 100% modulation, the pin 7 output
16
34
48
mVrms
S-meter output
VSM-AM
0 dBµ, 100% modulation
0
0
0.2
V
No. 5888-2/9
LA1838
Block Diagram
FM SD
BAND-W
30
+
RF
FM SD
ADJ
OSC
VT
29
28
AM AGC
OSC
BUFF
+
27
26
L.P.F
+
+
25
24
23
22
AM-STEREO
L / R- INPUT
L
R
L.P.F
21
20
+
+
19
18
L-OUT R-OUT
17
16
REG
ALC
BUFF
DECODER
ANTI- BIRDIE
AM
RF.AMP
AM
MIX
AM
OSC
P-DET
MUTE
STEREO
SW
AGC
AM I F
DET
VCO
304kHz
SD
COMP
FF
38k
FF π
19k∠2
FF
19k∠θ
PILOT
DET
AM
S-METER
FM
AM/FM
S-METER S-CURVE I F-BUFF
TUNING
DRIVE
4
5
7
TU- LED
FM IN
(10.7MHz)
6
+
8
9
10
+
11
12
13
14
15
FM
+
MUTE
3
AM IFT
AM- IF
2
ST- LED
1
VCC
AM/FM
IF-BUFF
GND
FM VSM
AM VSM
(SD-ADJ)
FM I F
STEREO
DRIVE
AM NARROW
SD
FM
DET
ST
+
+
MONO
AM
VCC
T00147
AC Test Circuit
0.01µF
29
28
26
25
24
23
22
21
20
9
10
11
FM
+
L-OUT R-OUT
+
3.3kΩ 10µF
+
3.3kΩ 10µF
+
1000pF
3.3µF
33µF
27
22µF
3kΩ
+
L.P.F
10µF
+
0.033µF
18kΩ
39mH
0.047µF
30
L.P.F
0.033µF
50Ω
OSC
20pF
39pF
0.047µF
REG
T1
5.1kΩ
1000pF
OSC
BUFF
(1.45MHz)
AFC
0.047µF
AM -IN
(1MHz)
19
18
17
12
13
14
16
T1: HW-50425
T2: YD-1073-1
The CDA10.7MG74 must be used for actual production models.
(Series resistance: 270 Ω)
+
1µF
+
AM
STEREO
5kΩ
+
FM
5kΩ
MONO
0.47µF
VDD
1µF
CDA10.7MGI-C
(For use as the DUT socket board)
15
3kΩ IF - BUFF
+
SEEK1000pF
*
VSM
VSM
10kΩ
+
AM
1µF
1000pF
AM - ST
8
ST
NORMAL
T2
+
68kΩ
450kHz
300Ω
7
SD
10µF
5kΩ
6
51Ω
5
330Ω
4
68kΩ
0.047µF
3
47µF
75Ω
0.047µF
2
0.047µF
1
FM IN
(10.7MHz)
0.047µF ( )
0.047µF
LA1838
VCC
9.0V
T00148
No. 5888-3/9
LA1838
Coil Specifications
• AM oscillator (for the DUT)
HW-50425 (Mitsumi)
3
4
2
6
1
• IFT
YD-1073-1 (Mitsumi)
S
3
➂-➁
➃-➅
➁-①
4
➁-①
➃-➅
➁-➂
2T
2
9T
86T
1
QO ≥ 80
L = 270 µH
S
6
YD-1073
58T
7T
94T
fO = 450 kHz
SFU450B
A10633
QO = 110
A 180-pF capacitor is built in
With an external SFU450B
A10634
Pin Functions
Pin No.
Pin function
Pin voltage
Notes
Equivalent circuit
1
1
FM IF input
Vreg
Input impedance ri = 330 Ω
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 kΩ
A10637
5
6
7
GND
0V
TU-LED
VCC
ST-LED,
VCC
AF-IF output
Active low
6
7
Open collector
AM stereo IF output (pin 7)
The influx current must be held under 150 µA.
A10638
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 Ω must be
used.
9
A10639
Continued on next page.
No. 5888-4/9
LA1838
Continued from preceding page.
Pin No.
10
Pin function
AM narrow band
CF connection
Pin voltage
Notes
Equivalent circuit
Recommended narrow band CF: BFU450 C4N
(Murata Mfg. Co., Ltd.)
1.3 V
10
When the narrow band SD function is not used,
bypass this circuit with a 50 Ω resistor and a
0.047 µF capacitor in series.
A10640
11
FM S-meter output
0V
RL = 8 kΩ
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)
V13 ≤ 0.5 V: Reception state
0V
13
1.4 V ≤ V13 ≤ 2.2 V: IF buffer output on
V13 ≥ 3.5 V: IF buffer output and muting on
A10643
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 kΩ (When VCC = 7 V)
3.9 kΩ (8 V), 5.1 kΩ (9 V)
6.2 kΩ (10 V), 7.5 kΩ (11 V)
14
A10644
The device is forced to monaural when a current of
over 50 µA flows from this pin.
15
Pilot detector lowpass filter (Forced
mono) (VCO stop)
VCC – 1.0
The VCO is stopped if this pin is connected to
ground.
15
The limit values for the resistor are the same as
those for pin 14.
Output impedance ro = 200 Ω
Pin 16: Right output, pin 17: Left output
16
17
18
A10645
Post-amplifier
inputs and outputs
Vreg
Vreg
19
Inverting input pins
Pin 18: Right input, pin 19: Left input
18
16
19
17
RNF = 33 kΩ
A10646
20
21
MPS outputs
3.5 V
3.5 V
Output impedance ro = 3.3 kΩ
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 kΩ
A10648
Output impedance ro = 3.0 kΩ
23
FM demodulator
output
2.8 V (FM)
2.8 V (AM)
23
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.
A10649
Output impedance ro = 3.3 kΩ
24
25
AM detector
output
AM AGC
0 V (FM)
0.5 V (AM)
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
The resistance of the built-in resistor R is 11 kΩ
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.
30
Output impedance ro = 200 Ω
A10656
No. 5888-6/9
LA1838
Overall FM Characteristics
Out
0
-10
-30
-40
-50
AMOut
-70
V
=9V
-80 f CC
c = 10.7 MHz
=
1
kHz,75 kHzdev
f
-90 m
AM = 30% mod
-100
0
20
40
60
80
100
3
2
1
THD
0
0
120
10
20
30
80
90 100 110 120
1.0
SUB
10
7
5
MAIN
AM
1.0
7
5
3
2
O
0.1
7
5
3
2
0.01
0.01
2 3
5 7 0.1
Separation vs. Frequency Characteristics
0
-R
Sep
5 7 1.0 2 3
5 7 10
2 3
Adjacent Channel Rejection Ratio
IF = 10.7 MHz, 100 dBµ, 75 kHzdev
-10 VS = 90%
PILOT = 10%
LA1836
-20 Referenced to the
L-R demodulated output
Sep -L
40
2 3
Frequency, freq — kHz
Frequency, fc — MH
45
ST
3
2
ON
2.0
0
10.60 10.62 10.64 10.66 10.68 10.70 10.72 10.74 10.76 10.78 10.80
35
Vobat — dB
Channel separation, Sep — dB
70
Input, — dBµ
3.0
30
25
20
15
-30
-40
-50
LA1838
-60
-70
10
-80
5
2 3
5 7 0.1
2 3
5 7 1.0
2 3
5 7 10
-90
70
2
90
110
130
150
170
190
210
230
Frequency, fs — kHz
Frequency, freq — kHz
6
60
Distortion vs. Frequency Characteristics
4.0
0
0.01
50
Input, — dBµ
VCC = 9 V
VIN = 100 dBµ
fm = 1 kHz, 75 kHzdev
50
40
FM THD vs. Band Characteristics
Total harmonic distortion, THD — %
Total harmonic distortion, THD — %
5.0
Noise
VSM
4
M
Output, — dBm
-20
-60
FM THD and VSM Characteristics
5
Total harmonic distortion, THD — %,
S-meter output, VSM — V
10
Capture Range Characteristics
SD Sensitivity Adjustment
90
CR+
80
12
30
4
2
SD on — dBµ
Capture range — %
70
0
-2
AM FM
60
FM
50
40
30
AM
20
-4
10
CR-6
10
20
30
Pilot — mV
40
0
0
2
4
6
8
10
12
14
16
Rsdadj — kΩ
No. 5888-7/9
LA1838
350
SD Band Adjustment Characteristics
Out
-10
300
-20
Output, — dBm
250
SD BW — kHz
Overall AM Characteristics
0
200
150
100
-30
-40
-50
-60
0
0
2
4
6
8
10
12
14
16
18
20
Radj — kΩ
2.0
1.5
THD = 80%mod
AM Detector Output Frequency Characteristics (1)
24
THD = 30%mod
40
60
80
100
120
2
µ
-15
-20
-25
-30
C
2 3
5 7 0.1
Input, — dB
Output voltage, VO — dBV
R = 10 k
R
1.0
Total harmonic distortion, THD — %
24
-5
22
0.01 µF
-10
R = 33 k
R = 18 k
-20
-25
-30
-35
-40
0.01 2 3
5 7 0.1
2 3
5 7 1.0
2 3
5 7 10
2
Frequency, fm — kHz
90
5 7 1.0
2 3
5 7 10
2
Distortion vs. Ambient Temperature Characteristics
7
5
THD sub THD Mono
3
2
THD st
0.1
-40
-20
0
20
40
THD Main
60
80
100
Ambient temperature, Ta — °C
Separation vs. Ambient Temperature Characteristics
S/N Mono
80
Channel separation, Sep — dB
2 3
Frequency, fm — kHz
AM Detector Output Frequency Characteristics (2)
-15
22
-10
-40
0.01
140
R
C
-35
0.5
0
140
C
=0 C=
0.
.
02
7 µ 01 µ
2.5
20
120
.04
VSM
3.0
0
100
=0
3.5
0
-20
80
-5
Output voltage, VO — dBV
Total harmonic distortion, THD — %
S-meter output, VSM — V
0
VCC = 9 V
4.5 fc = 1 MHz
fm = 1 kHz, 30%mod
4.0
1.0
60
Input, — dBµ
AM THD and VSM Characteristics
5.0
Noise
-70 VCC = 9 V
fc = 1 MHz
fm = 1 kHz,30%mod
-80
-20
0
20
40
50
S/N Stereo
70
60
Sep- R
50
Sep- L
40
30
20
10
0
-40
-20
0
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