Datasheet LA1836, LA1836M Datasheet (SANYO)

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 = 25°C

Note: * An 85 × 115 × 1.6 mm3glass-epoxy printed circuit board.

Operating Conditions at Ta = 25°C

Electrical Characteristics at Ta = 25°C, VCC= 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 ≤ 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

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, fm= 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 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

Total harmonic distortion

THD-FM (1) 100 dBµ, 100% mod, the pin 16 output 0.3 1.3 %

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 V

IFBuff

-FM 100 dBµ, the pin 11 output 80 120 160 mVrms

V

SM

-FM (1) 0 dBµ, the pin 12 output 0 0.5 1.0 V

S-meter output V

SM

-FM (2) 60 dBµ, the pin 12 output 1.8 3.2 4.5 V

V

SM

-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): f

c

= 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

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, fm= 1 kHz]

Quiescent current I

CCO

-AM No input 29 42 mA

Detector output

V

O

-AM (1) 23 dBµ, 30% mod, the pin 16 output 25 45 90 mVrms

V

O

-AM (2) 80 dBµ, 30% mod, the pin 16 output 195 310 490 mVrms

S/N ratio

S/N-AM (1) 23 dBµ, 30% mod, the pin 16 output 16 20 dB
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 %

Total harmonic distortion

THD-AM (2) 100 dBµ, 30% mod, the pin 16 output (DIP) 0.4 1.2 %
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 V

OSC

-AM 80 dBµ, 30% mod, the pin 16 output 110 160 mVrms

Low band attenuation Low-Cut Referenced to f

m

= 1 kHz, the output when fm= 100 Hz 5 7 11 dB

IF count buffer output V

IFBuff

-AM 80 dBµ, unmodulated, the pin 11 output 140 200 280 mVrms

ST-IF output V

STIF

-AM 80 dBµ, unmodulated, the pin 8 output 8 17 24 mVrms

S-meter output

V

SM

-AM (1) 0 dBµ, unmodulated 0 0 0.2 V

V

SM

-AM (2) 40 dBµ, unmodulated 1.3 3.0 4.5 V

Block Diagram

Test Circuit Diagram

No. 4787-4/13

LA1836, 1836M

Unit (resistance: Ω, capacitance: F)

Unit (resistance: Ω, 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 Ω

Also used for the AM noise filter

V

REG

= 3.6 V

Input impedance r

i

= 2 kΩ

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 low­pass 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 µA or larger flows from this pin.

Connecting this pin to ground stops the VCO.

Output impedance r

o

= 200 Ω
Pin 16: left output
Pin 17: right output

Inverting inputs: r

i

= 3.3 kΩ
Pin 18: left input
Pin 19: right input

Output impedance r

o

= 3.3 kΩ
Pin 20: left de-emphasis
Pin 21: right de-emphasis

Input impedance r

i

= 20 kΩ
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 kΩ (FM), 10 kΩ (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 kΩ

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 Ω

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.

■ 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.