SANYO LA1862M Datasheet

Ordering number: EN 4092B

Monolithic Linear IC

LA1862M

Single-chip Tuner System for Car Stereo

Overview

The LA1862M is a single-chip car stereo FM IF/NC/MPX
tuner IC which offers improved IF stability and S-meter
characteristics, compared with the LA1861M.
The LA1862M makes the design of high-performance FM
tuners at low cost easy.

Functions

.

IF amplifier

.

Peak detector

.

AF preamplifier

.

AFC output

.

S-meter driver

.

Soft mute circuit

.

IF buffer output

.

Noise canceller

.

Adjustment-free VCO

.

Pilot signal canceller

.

SNC High-cut control (HCC)

Features

.

Pin compatible with the LA1861M

.

Improved I/O S-meter characteristics

.

Excellent sound quality at low input levels

.

Easy adjustment of muting characteristics

.

Because this device has a 36-pin flat package, it requires few
external components and offers excellent cost performance.

Package Dimensions

unit : mm

3129-MFP36S

[LA1862M]

SANYO : MFP36S

Specifications

Maximum Ratings at Ta = 25°C

Parameter Symbol Conditions Ratings Unit
Maximum supply voltage V
Allowable power

dissipation
Input voltage V

Input current I
Output current I
Operating temperature Topr –30 to +80 °C
Storage temperature Tstg –40 to +150 °C

max Pin 8 10 V

CC

Pd max Ta = 25°C 720 mW

IF Pin 36-35 (IF input) ±0.7 Vp-p

IN

V

MPX Pin 26 (NC-MPX input) 1.0 Vrms

IN

max Pin 25 (stereo lamp drive current) 20 mA

L

max Pin 5 (SD output) 1.0 mA

SD

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TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN

63098HA(II)/N0893TS A8-8753/O022 TS No.4092-1/27

LA1862M

Operating Conditions at Ta = 25°C

Parameter Symbol Conditions Ratings Unit
Recommended supply voltage V
Operating supply voltage range V

CC

op 7.5 to 10 V

CC

Operating Characteristics at Ta = 25°C, VCC= 8.5 V, f = 10.7 MHz, unless otherwise noted SW-1

is off.

Parameter Symbol Conditions min typ max Unit
Quiescent current I
Current drain I

CCO

CC-100

Demodulator output voltage V

THD 1

Total harmonic distortion

THD 2

Signal-to-noise ratio S/N

Input limiting voltage V

IN lim

Muting attenuation (1) Mute

Muting attenuation (2) Mute
Muting bandwidth BW

AM rejection ratio AMR

V

Muting drive output voltage

S-meter output voltage

V

5-100

V

V

V

1-100

5-0

1-0

1-50

IF COUNT output sensitivity IF input level at IF COUNT ON. SW-1 is ON. 44 53 62 dBµ
IF buffer output voltage V

IF-ON

Input impedance Z
Output noise voltage V

Gate time t

NO

gate VIN

Noise sensitivity SN V
Channel separation Sep
Stereo indicator threshold level Pilot signal level when the LED turns ON. 1.0 2.5 5.0 %

Stereo indicator hysteresis hy LED ON level - LED OFF level 3.2 6.5 dB
Capture range C.R CR = | (f – 456)/456 x 100 |±1.2 %

SCA rejection ratio SCA rej

SNC output attenuation Att

SNC output voltage V

Att

SNC

Osub

HCC

High-out control attenuation

Att

HCC

Ripple rejection R
Channel balance CB | Pin 15 output – pin 16 output | 0 1.5 dB

Pilot signal attenuation
Stereo indicator LED current Minimum stereo drive current 1.0 mA

Pin 25 saturation voltage I

Note: When a filter is not specified, connect an IHF bandpass filter to the MPX outputs.

No input signal 45 70 mA
VIN= 100 dBµ 47 72 mA
VIN=100dBµ,f=1kHz,

O

100% modulation, pin 15 output
Mono, V

100% modulation, pin 15 output

=100dBµ,f=1kHz,

IN

Stereo (L + R),
V

=100dBµ,f=1kHz,

IN

100% modulation, pin 15 output
V

=100dBµ,f=1kHz,

IN

100% modulation
VIN= 100 dBµ reference, 3 dB audio output

attenuation, IF input level, soft muting ON
V5=5V,VIN=100dBµ,f=1kHz,

Att

100% modulation
V5=2V,VIN=100dBµ,f=1kHz,

Att

100% modulation

MuteVIN

= 100 dBµ, V5 = 2 V 135 200 305 kHz

V

= 100 dBµ, 400 Hz, 100% modulated FM

IN

carrier. 1 kHz, 30% modulated AM interference
signal

No input signal 3.5 4.7
VIN= 100 dBµ 0 0.3
No input signal 0.1 0.5 V
VIN= 50 dBµ 1.1 1.9 2.7
VIN= 100 dBµ 5.4 6.4 7.4

VIN= 100 dBµ. SW-1 is ON. 200 300 480 mVrms
f = 1 kHz 20 kΩ

in

Pin 26 connected to ground 27 µV

= 100 mVp-p, 1 µs pulsewidth,f=1kHz
= 1 µs pulsewidth,f=1kHz 35 mVp-o

IN

f = 1 kHz, 90% L+R signal modulation. 10% pilot
signal modulation, IHF bandpass filter.

90% L + R signal modulation. 10% pilot signal
modulation. 67 kHz, 10% modulated SCA signal

V14 = 0.6 V, 90% L – R signal modulation. 10%
pilot signal modulation

V14 = 0.1 V, 90% L – R signal modulation. 10%
pilot signal modulation

V13 = 0.6 V, 90% L + R signal modulation. 10%

1

pilot signal modulation
V = 1.1 V, 90% L + R signal modulation. 10% pilot

2

signal modulation
f = 50 Hz, V = 100 mVrms 27 dB

r

Left channel adjusted and measured
DIN audio filter. See Note.

=10mA 1.0 V

L

8.5 V

225 350 495 mVrms

0.3 1.2 %

0.3 1.2 %

64 71 dB

32 41 50 dBµ

21 25 29 dB

510 15dB

47 60 dB

13 23 35 µs

36 50 dB

75 dB

–12.0 –7.5 –3.0 dB

5mV

–15 –5 0 dB

–2.0 0 dB

15 22 dB

V

V

No. 4092- 2/27

LA1862M

Specified board (80 × 40 × 2mm3glass epoxy resin)

Independent IC

Test Circuit

Allowable power dissipation, Pd max – mW

Ambient temperature, Ta – °C

Unit (resistance: Ω, capacitance: F)

No. 4092- 3/27

LA1862M

Pin Description

Pin No. Description

1 S-meter output
2 IF buffer sensitivity control
3 IF buffer output
4 Muting threshold control
5 Muting drive control output
6 Noise sensitivity control
7 Noise AGC sensitivity control
8 Supply voltage (V

9 Gate time control output
10 Peak hold network connection
11 Lowpass filter output
12 High-cut attenuation control
13 High-cut control input
14 SNC control input
15 MPX left-channel audio output
16 MPX right-channel audio output
17 Pilot cancel signal input
18 Pilot cancel signal output
19 Pilot detector capacitor connection 1
20 Pilot detector capacitor connection 2
21 External VCO (F23) connection
22 Phase detector network connection 1
23 Phase detector network connection 2
24 PLL input
25 Stereo indicator LED driver output
26 Noise canceller input
27 Ground
28 Audio muting amplifier output (AF output)
29 AFC output
30 Peak detector input
31 IF signal output
32 Muting attenuation control
33 Voltage reference output
34 Pilot signal canceller detector
35 IF input
36 IF bypass input

CC

)

No. 4092- 4/27

Sample Application Circuit

LA1862M

Frequency
divider

PCB Pattern

Unit (resistance: Ω, capacitance: F)

Unit (resistance: Ω, capacitance: F)

No. 4092- 5/27

(Mitsumi)

Sample Application Circuit (USA)

No. 4092- 6/27

gain

Note 1: Used to change the SD sensitivity
Note 2: When LOC goes HIGH, the IF count and SD

sensitivity shift by 25 dB

Frequency

divider

Unit (resistance: Ω, capacitance: F)

LA1862M

See note 1.

LA1862M

Pin Functions

Pin No. Function Equivalent circuit Remarks

FM
S-meter
detector

1 S-meter output

IF amplifier

2 IF buffer ON adjust

Current-drive waveform
S-meter circuit

3 IF buffer output

4 Mute adjust

Inversion circuit

Control signal:

SEEK when HIGH (V

STOP when LOW (GND)
Pin 3 should be left open if
not using the IF count

DD

Continued on next page.

)

No. 4092- 7/27

LA1862M

Continued from preceding page.

Pin No. Function Equivalent circuit Remarks

Mute
circuit

5 Mute drive

6 Noise sensitivity adjust

7 NoiseAGC

S-meter
detector

Mute band
detector

Noise
demodulator

9 Gate time adjust

10 Memory circuit

11 LPF output

17 Pilot cancel signal input

Pulse
detector

To MPX
input

Subtraction
circuit

Gate

Gate
circuit

Pin 9
voltage

The gate is open when the
voltage on pin 9 is 1.4 V
(2V

) or higher.

D

Continued on next page.

No. 4092- 8/27

LA1862M

Continued from preceding page.

Pin No. Function Equivalent circuit Remarks

Composite signal

12 High-cut capacitive coupling

13 HCC control input

14 SNC control input

High-cut frequency set pin

15

16

MPX outputs

Output R = 3.3 kΩ
Load R built-in

Multiplier

Continued on next page.

No. 4092- 9/27