Ordering number : EN4787A

Monolithic Linear IC

LA1836, 1836M

Single-Chip Home Stereo Electronic Tuning IC

Overview Package Dimensions

AM: RF amplifier, mixer, oscillator (with ALC), IF unit: mm
amplifier, detector, AGC, oscillator buffer, tuning 3196-DIP30SD
indicator (narrow-band SD), IF buffer output, IF output
for AM stereo [LA1836]
• 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 SANYO: DIP30SD
• Variable AM stop sensitivity
• Built-in AM local oscillator buffer unit: mm
• Variable AM low cut control 3073A-MFP30S

[LA1836M]

SANYO: MFP30S

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
O3097HA (OT)/82294TH (OT) B8-0904, B8-0850 No. 4787-1/13
 LA1836, 1836M

Specifications
Maximum Ratings at Ta = 25°C

Parameter Symbol Conditions Ratings Unit

Maximum supply voltage VCC max 9.0 V
At Ta ≤ 70°C, on the recommended printed circuit board*
550 mW
Allowable power dissipation Pd max [LA1836, LA1836M]
At Ta = 70°C, independent IC [LA1836M only] 320 mW
Operating temperature Topr –20 to +70 °C
Storage temperature Tstg –40 to +125 °C
Note: * An 85 × 115 × 1.6 mm3 glass-epoxy printed circuit board.

Operating Conditions at Ta = 25°C

Parameter Symbol Ratings Unit

Recommended supply voltage VCC 7.0 V
Operating supply voltage range VCC op 6.5 to 8.5 V

Electrical Characteristics at Ta = 25°C, VCC = 7.0 V unless otherwise specified

(MFP package using the Yamaichi Electric IC-51-0302-426MF socket)

Parameter Symbol Conditions min typ max Unit

[FM characteristics (mono): fc = 10.7 MHz, fm = 1 kHz, with the coil adjusted at VREG – VAFC = 0 V]
Quiescent current ICCO-FM No input 37 50 mA
Demodulator output VO-FM 100 dBµ, 100% mod, the pin 16 output 730 1100 1460 mVrms
Channel balance (mono) C.B-mono 100 dBµ, 100% mod, the pin 16 output/pin 17 output –1.5 0 +1.5 dB
THD-FM (1) 100 dBµ, 100% mod, the pin 16 output 0.3 1.3 %
Total harmonic distortion
THD-FM (2) 100 dBµ, 200% mod, the pin 16 output 1.5 8.0 %
S/N ratio S/N-FM 100 dBµ, 100% mod, the pin 16 output 72 80 dB
AM suppression ratio AMR 100 dBµ, AM 30% mod, the pin 16 output 40 60 dB
Input limiting voltage –3dBL.S. 100 dBµ, referenced to 100% mod, a 3 dB down input 34 42 dBµ
LED on sensitivity SD-On-FM 46 56 66 dBµ
LED on bandwidth SD-BW 100 dBµ 90 125 170 kHz
IF count buffer output VIFBuff-FM 100 dBµ, the pin 11 output 80 120 160 mVrms
VSM-FM (1) 0 dBµ, the pin 12 output 0 0.5 1.0 V
S-meter output VSM-FM (2) 60 dBµ, the pin 12 output 1.8 3.2 4.5 V
VSM-FM (3) 100 dBµ, the pin 12 output 3.5 4.2 5.0 V
Muting attenuation Mute-Att 100 dBµ, 100% mod, the pin 16 output 80 95 dB
[FM characteristics (stereo): fc = 10.7 MHz, fm = 1 kHz, L + R = 90%, pilot = 10%, VIN = 100 dBµ]
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

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Parameter Symbol Conditions min typ max Unit

[AM characteristics: fc = 1000 kHz, fm = 1 kHz]
Quiescent current ICCO-AM No input 29 42 mA
VO-AM (1) 23 dBµ, 30% mod, the pin 16 output 25 45 90 mVrms
Detector output
VO-AM (2) 80 dBµ, 30% mod, the pin 16 output 195 310 490 mVrms
S/N-AM (1) 23 dBµ, 30% mod, the pin 16 output 16 20 dB
S/N ratio
S/N-AM (2) 80 dBµ, 30% mod, the pin 16 output 48 54 dB
THD-AM (1) 80 dBµ, 30% mod, the pin 16 output 0.3 1.0 %
THD-AM (2) 100 dBµ, 30% mod, the pin 16 output (DIP) 0.4 1.2 %
Total harmonic distortion
THD-AM (2) 107 dBµ, 30% mod, the pin 16 output (MFP) 0.8 1.6 %
THD-AM (3) 80 dBµ, 80% mod, the pin 16 output 1.0 4.0 %
LED on sensitivity SD-On-AM 20 30 40 dBµ
Local oscillator buffer output VOSC-AM 80 dBµ, 30% mod, the pin 16 output 110 160 mVrms
Low band attenuation Low-Cut Referenced to fm = 1 kHz, the output when fm = 100 Hz 5 7 11 dB
IF count buffer output VIFBuff-AM 80 dBµ, unmodulated, the pin 11 output 140 200 280 mVrms
ST-IF output VSTIF-AM 80 dBµ, unmodulated, the pin 8 output 8 17 24 mVrms
VSM-AM (1) 0 dBµ, unmodulated 0 0 0.2 V
S-meter output
VSM-AM (2) 40 dBµ, unmodulated 1.3 3.0 4.5 V

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Block Diagram

Unit (resistance: Ω, capacitance: F)

Test Circuit Diagram

Unit (resistance: Ω, capacitance: F)

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Pin Functions

Pin No. Function Voltage Internal equivalent circuit Remarks

1 FM IF input VREG Input impedance ri = 330 Ω

2 AM mixer output VCC

3 FM IF input bypass VREG Also used for the AM noise filter

4 REG VREG VREG = 3.6 V

5 AM IF input VREG Input impedance ri = 2 kΩ

6 GND 0V

Tu – LED Active low

7 VCC
ST – LED, AM – IF Open collector
8 VCC
output AM stereo IF output (pin 8)

Recommended detector coil: 600TEAS-8199Z

9 FM detector VCC (Toko)
SA281 (Sumida)

10 VCC VCC

The post-amplifier muting turns on for applied

AM/FM IF buffer output, voltages of 1.3 V and over.
11 output control SW 0V
(muting switch) The IF buffer output turns on at 4.0 V and over.
Recommended muting on control voltage: 1.9 V

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Pin No. Function Voltage Internal equivalent circuit Remarks

The AM SD sensitivity can be adjusted with the

resistor between this pin and ground.
S-meter output, AM SD 0.5 V (FM)
12 The AM SD sensitivity should be adjusted first,
sensitivity adjustment 0 V (AM)
since the FM SD sensitivity is affected by this
adjustment.

AM narrow band CF Recommended narrow band CF: BFU450C4N

13 1.5 V
connection (Murata)

Phase comparator low- VCC – 1.4

(FM) AM mode selected when this pin is connected to
14 pass filter
ground.
(FM/AM switch) 0 V (AM)

Pilot detector low-pass The circuit is forced to mono when a current of

15 filter (forced mono) VCC – 1.0 50 µA or larger flows from this pin.
(VCO stop) Connecting this pin to ground stops the VCO.

16 VREG Output impedance ro = 200 Ω

Post-amplifier L output
Pin 16: left output
17 and R output VREG
Pin 17: right output

18 VREG Inverting inputs: ri = 3.3 kΩ

Post-amplifier L input
Pin 18: left input
19 and R input VREG
Pin 19: right input

20 3.5 V Output impedance ro = 3.3 kΩ

MPX output, L output
Pin 20: left de-emphasis
21 and R output 3.5 V Pin 21: right de-emphasis

Input impedance ri = 20 kΩ
The low-band separation characteristics are
improved by increasing the value of the capacitor
22 MPX input 2.9 V
connected between this pin and pin 24. However,
the impulse noise associated with AM/FM
switching will increase.

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Pin No. Function Voltage Internal equivalent circuit Remarks

3.5 V (FM) Recommended ceramic resonator: CSB456F15

23 MPX VCO
0 V (AM) (Murata)

Output impedance: 1.5 kΩ (FM), 10 kΩ (AM)

AM/FM demodulator 2.9 V (FM) The separation can be adjusted with the external
24
output 3.0 V (AM) capacitor connected between this pin and
ground.

The AF demodulation frequency low area

frequency characteristics can be adjusted with
2.9 V (FM) the external capacitor connected between this
25 AM low cut
3.0 V (AM) pin and ground. The AM detector output can be
attenuated by connecting a resistor in series with
this capacitor.

0 V (FM)
26 AM AGC Internal load resistance: R = 6.7 kΩ
0.5 V (AM)

This pin must be used at the same potential as

27 AM RF input VREG
pin 4.

The FM-SD bandwidth can be adjusted with the

28 AFC VREG external resistor connected between this pin and
pin 4.

The oscillator coil is connected between this pin

29 OSC VREG
and pin 4.

The FM SD sensitivity can be adjusted with the

Oscillator buffer output,
1.6 V (FM) external resistor connected between this pin and
30 FM SD sensitivity
1.3 V (AM) ground.
adjustment
Output impedance ro = 200 Ω

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■ 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.
■ Anyone purchasing any products described or contained herein for an above-mentioned use shall:
➀ 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:
➁ 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.
■ 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 October, 1997. Specifications and information herein are subject to
change without notice.

No. 4787-13/13