Overview
AM: RF amplifier, mixer, oscillator (with ALC), IF
amplifier, detector, AGC, oscillator buffer, tuning
indicator (narrow-band SD), IF buffer output, IF output
for AM stereo
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), post-amplifier (with
muting function)
Features
Reduced number of adjustments (adjustment-free MPX
VCO: ceramic resonator adopted)
Tuning indicator pin (Can be used as a narrow-band stop
signal and as a muting output driver.)
Variable FM stop sensitivity and band
Variable AM stop sensitivity
Built-in AM local oscillator buffer
Variable AM low cut control
Package Dimensions
unit: mm
3196-DIP30SD
Monolithic Linear IC
Ordering number : EN4787A
O3097HA (OT)/82294TH (OT) B8-0904, B8-0850 No. 4787-1/13
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
Single-Chip Home Stereo Electronic Tuning IC
LA1836, 1836M
SANYO: DIP30SD
[LA1836]
unit: mm
3073A-MFP30S
SANYO: MFP30S
[LA1836M]
Specifications
Maximum Ratings
at Ta = 25C
Note:
*
An 85
115
1.6 mm
3
glass-epoxy printed circuit board.
Operating Conditions
at Ta = 25C
Electrical Characteristics
at Ta = 25C, V
CC
= 7.0 V unless otherwise specified
(MFP package using the Yamaichi Electric IC-51-0302-426MF socket)
No. 4787-2/13
LA1836, 1836M
Parameter
Symbol
Conditions
Ratings
Unit
Maximum supply voltage
V
CC
max
9.0
V
At Ta
70C, on the recommended printed circuit board
*
550
mW
Allowable power dissipation
Pd max
[LA1836, LA1836M]
At Ta = 70C, independent IC [LA1836M only]
320
mW
Operating temperature
Topr
20 to +70
C
Storage temperature
Tstg
40 to +125
C
Parameter
Symbol
Ratings
Unit
Recommended supply voltage
V
CC
7.0
V
Operating supply voltage range
V
CC
op
6.5 to 8.5
V
Parameter
Symbol
Conditions
min
typ
max
Unit
[FM characteristics (mono): f
c
= 10.7 MHz, f
m
= 1 kHz, with the coil adjusted at V
REG
V
AFC
= 0 V]
Quiescent current
I
CCO
-FM
No input
37
50
mA
Demodulator output
V
O
-FM
100 dB, 100% mod, the pin 16 output
730
1100
1460
mVrms
Channel balance (mono)
C.B-mono
100 dB, 100% mod, the pin 16 output/pin 17 output
1.5
0
+1.5
dB
Total harmonic distortion
THD-FM (1) 100 dB, 100% mod, the pin 16 output
0.3
1.3
%
THD-FM (2) 100 dB, 200% mod, the pin 16 output
1.5
8.0
%
S/N ratio
S/N-FM
100 dB, 100% mod, the pin 16 output
72
80
dB
AM suppression ratio
AMR
100 dB, AM 30% mod, the pin 16 output
40
60
dB
Input limiting voltage
3dBL.S.
100 dB, referenced to 100% mod, a 3 dB down input
34
42
dB
LED on sensitivity
SD-On-FM
46
56
66
dB
LED on bandwidth
SD-BW
100 dB
90
125
170
kHz
IF count buffer output
V
IFBuff
-FM
100 dB, the pin 11 output
80
120
160
mVrms
V
SM
-FM (1) 0 dB, the pin 12 output
0
0.5
1.0
V
S-meter output
V
SM
-FM (2) 60 dB, the pin 12 output
1.8
3.2
4.5
V
V
SM
-FM (3) 100 dB, the pin 12 output
3.5
4.2
5.0
V
Muting attenuation
Mute-Att
100 dB, 100% mod, the pin 16 output
80
95
dB
[FM characteristics (stereo): f
c
= 10.7 MHz, f
m
= 1 kHz, L + R = 90%, pilot = 10%, V
IN
= 100 dB]
Separation - L
Sep-L
L mod, the pin 17 output/pin 16 output
30
45
dB
Separation - R
Sep-R
R mod, the 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
1.3
%
Channel balance (main)
C.B-main
The pin 16 output/pin 17 output
1.5
0
+1.5
dB
Capture range
C.R
Pilot = 10%
1.5
%
Adjacent channel interference
B.Rej.
fs = 113 kHz, Vs = 90%, pilot = 10%, the pin 16 output
40
dB
rejection ration
Continued on next page.
Continued from preceding page.
No. 4787-3/13
LA1836, 1836M
Parameter
Symbol
Conditions
min
typ
max
Unit
[AM characteristics: f
c
= 1000 kHz, f
m
= 1 kHz]
Quiescent current
I
CCO
-AM
No input
29
42
mA
Detector output
V
O
-AM (1)
23 dB, 30% mod, the pin 16 output
25
45
90
mVrms
V
O
-AM (2)
80 dB, 30% mod, the pin 16 output
195
310
490
mVrms
S/N ratio
S/N-AM (1)
23 dB, 30% mod, the pin 16 output
16
20
dB
S/N-AM (2)
80 dB, 30% mod, the pin 16 output
48
54
dB
THD-AM (1) 80 dB, 30% mod, the pin 16 output
0.3
1.0
%
Total harmonic distortion
THD-AM (2) 100 dB, 30% mod, the pin 16 output (DIP)
0.4
1.2
%
THD-AM (2) 107 dB, 30% mod, the pin 16 output (MFP)
0.8
1.6
%
THD-AM (3) 80 dB, 80% mod, the pin 16 output
1.0
4.0
%
LED on sensitivity
SD-On-AM
20
30
40
dB
Local oscillator buffer output
V
OSC
-AM
80 dB, 30% mod, the pin 16 output
110
160
mVrms
Low band attenuation
Low-Cut
Referenced to f
m
= 1 kHz, the output when f
m
= 100 Hz
5
7
11
dB
IF count buffer output
V
IFBuff
-AM
80 dB, unmodulated, the pin 11 output
140
200
280
mVrms
ST-IF output
V
STIF
-AM
80 dB, unmodulated, the pin 8 output
8
17
24
mVrms
S-meter output
V
SM
-AM (1) 0 dB, unmodulated
0
0
0.2
V
V
SM
-AM (2) 40 dB, unmodulated
1.3
3.0
4.5
V
Block Diagram
Test Circuit Diagram
No. 4787-4/13
LA1836, 1836M
Unit (resistance:
, capacitance: F)
Unit (resistance:
, capacitance: F)
Pin Functions
No. 4787-5/13
LA1836, 1836M
Pin No.
Function
Voltage
Internal equivalent circuit
Remarks
1
2
3
4
5
6
7
8
9
10
11
FM IF input
AM mixer output
FM IF input bypass
REG
AM IF input
GND
Tu LED
ST LED, AM IF
output
FM detector
V
CC
AM/FM IF buffer output,
output control SW
(muting switch)
V
REG
V
CC
V
REG
V
REG
V
REG
0 V
V
CC
V
CC
V
CC
V
CC
0 V
Input impedance r
i
= 330
Also used for the AM noise filter
V
REG
= 3.6 V
Input impedance r
i
= 2 k
Active low
Open collector
AM stereo IF output (pin 8)
Recommended detector coil: 600TEAS-8199Z
(Toko)
SA281 (Sumida)
The post-amplifier muting turns on for applied
voltages of 1.3 V and over.
The IF buffer output turns on at 4.0 V and over.
Recommended muting on control voltage: 1.9 V
Continued on next page.
Continued from preceding page.
No. 4787-6/13
LA1836, 1836M
Pin No.
Function
Voltage
Internal equivalent circuit
Remarks
12
13
14
15
16
17
18
19
20
21
22
S-meter output, AM SD
sensitivity adjustment
AM narrow band CF
connection
Phase comparator low-
pass filter
(FM/AM switch)
Pilot detector low-pass
filter (forced mono)
(VCO stop)
Post-amplifier L output
and R output
Post-amplifier L input
and R input
MPX output, L output
and R output
MPX input
0.5 V (FM)
0 V (AM)
1.5 V
V
CC
1.4
(FM)
0 V (AM)
V
CC
1.0
V
REG
V
REG
V
REG
V
REG
3.5 V
3.5 V
2.9 V
The AM SD sensitivity can be adjusted with the
resistor between this pin and ground.
The AM SD sensitivity should be adjusted first,
since the FM SD sensitivity is affected by this
adjustment.
Recommended narrow band CF: BFU450C4N
(Murata)
AM mode selected when this pin is connected to
ground.
The circuit is forced to mono when a current of
50 A or larger flows from this pin.
Connecting this pin to ground stops the VCO.
Output impedance r
o
= 200
Pin 16: left output
Pin 17: right output
Inverting inputs: r
i
= 3.3 k
Pin 18: left input
Pin 19: right input
Output impedance r
o
= 3.3 k
Pin 20: left de-emphasis
Pin 21: right de-emphasis
Input impedance r
i
= 20 k
The low-band separation characteristics are
improved by increasing the value of the capacitor
connected between this pin and pin 24. However,
the impulse noise associated with AM/FM
switching will increase.
Continued on next page.
Continued from preceding page.
No. 4787-7/13
LA1836, 1836M
Pin No.
Function
Voltage
Internal equivalent circuit
Remarks
23
24
25
26
27
28
29
30
MPX VCO
AM/FM demodulator
output
AM low cut
AM AGC
AM RF input
AFC
OSC
Oscillator buffer output,
FM SD sensitivity
adjustment
3.5 V (FM)
0 V (AM)
2.9 V (FM)
3.0 V (AM)
2.9 V (FM)
3.0 V (AM)
0 V (FM)
0.5 V (AM)
V
REG
V
REG
V
REG
1.6 V (FM)
1.3 V (AM)
Recommended ceramic resonator: CSB456F15
(Murata)
Output impedance: 1.5 k
(FM), 10 k
(AM)
The separation can be adjusted with the external
capacitor connected between this pin and
ground.
The AF demodulation frequency low area
frequency characteristics can be adjusted with
the external capacitor connected between this
pin and ground. The AM detector output can be
attenuated by connecting a resistor in series with
this capacitor.
Internal load resistance: R = 6.7 k
This pin must be used at the same potential as
pin 4.
The FM-SD bandwidth can be adjusted with the
external resistor connected between this pin and
pin 4.
The oscillator coil is connected between this pin
and pin 4.
The FM SD sensitivity can be adjusted with the
external resistor connected between this pin and
ground.
Output impedance r
o
= 200
No. 4787-8/13
LA1836, 1836M
No. 4787-9/13
LA1836, 1836M
No. 4787-10/13
LA1836, 1836M
No. 4787-11/13
LA1836, 1836M
No. 4787-12/13
LA1836, 1836M
No. 4787-13/13
LA1836, 1836M
This catalog provides information as of October, 1997. Specifications and information herein are subject to
change without notice.
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.
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