SANYO LA1135, LA1135M Datasheet

Ordering number: EN1272E

Monolithic Linear IC

LA1135, 1135M

AM Tuner System for

Car Radios and Home Stereos

Overview

The LA1135 is a high-performance AM electronic tuner IC that
is greatly improved in cross modulation characteristics. It is
especially suited for use in car radio and home stereo (antenna:
loop) applications.

Functions

.

MIX

.

OSC (with ALC)

.

IF amplifier

.

Detector

.

AGC (normal)

.

RF wide-band AGC

.

Auto search stop signal (signal meter output)

.

Local oscillation buffer output

.

Others

Features

.

Excellent cross modulation characteristics: Meets the
requirements for preventing not only adjacent-channel
interference but also interference caused by all channels
within broadcast band.

.

Narrow-band signal meter output: Usable as auto search stop
signal. Has linearity up to 80 dBµ.

.

Local oscillation buffer output: Facilitates designing of
electronic tuner system, frequency display, etc.

.

OSC (with ALC): Improves tracking error because
oscillation output is stabilized at a low level (380 mVrms)
for varactor diode.

.

MIX: Double-balanced differential MIX meeting the
requirements for preventing spurious interference, IF
interference.

.

Good characteristics at high input: 130 dBµ input
f

= 400 Hz 80% mod THD = 0.4% typ

m

.

Low noise: Good S/N at medium input (56 dB typ)

.

Usable sensitivity: (S/N = 20 dB input): 25 dBµ (2SK315
I

= 11mA)

DSS

.

VCCvariation compensation: Less variation in gain,
distortion: 8 to 12 V

.

Reduced pop noise: Capable of reducing pop noise at the
time of V
constant.

ON, mode select by adjusting AGC time

CC

Package Dimensions

unit : mm

3021B-DIP20S

[LA1135]

SANYO : DIP20S

unit : mm

3036B-MFP20

[LA1135M]

SANYO: MFP20

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

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

93097HA(II)/D0994JN/O217KI/4034KI.TS(KOTO) No.1272-1/18

LA1135, 1135M

Specifications

Maximum Ratings at Ta = 25°C

Parameter Symbol Conditions Ratings Unit
Maximum supply voltage V
Output voltage V
Input voltage V
Current drain I
Flow-out current I

Allowable power
dissipation

Operating temperature Topr LA1135 –20 to +70 °C

Storage temperature Tstg –40 to +125 °C

Operating Conditions at Ta = 25°C

Parameter Symbol Conditions Ratings Unit
Recommended supply

voltage
Operating supply voltage

range

max Pins 8, 14 16 V

CC

O

IN

CC

18

I

20

Pd max LA1135 730 mW

V

CC

V

op 7.5to12 V

CC

Pins 7, 10 24 V
Pin 6 5.6 V
Pins7+8+10+14 41 mA
Pin 18 2 mA
Pin 20 2 mA

LA1135M Ta % 60°C, with PCB 660 mW

LA1135M –40 to +80 °C

8V

Operating Characteristics at Ta = 25°C, VCC=8V,fr= 1 MHz, fm= 400 Hz, See specified Test

Circuit.

Parameter Symbol Conditions min typ max Unit

I

1 Quiescent 13.5 22.5 32.5 mA

Current drain

Detection output
Signal-to-noise ratio S/N 74 dBµ input, 30% mod 51.0 56.0 dB

Total harmonic distortion

Signal meter output
Input at signal meter output 1 V V

Local oscillation buffer output V

CC

I

2 130 dBµ input 20.0 30.0 41.0 mA

CC

V

1 16 dBµ input, 30% mod –29.0 –25.0 –21.0 dBm

O

V

2 74 dBµ input, 30% mod –15.0 –12.0 –9.0 dBm

O

THD1 74 dBµ input, 30% mod 0.3 1.0 %
THD2 74 dBµ input, 80% mod 0.3 1.0 %
THD3 130 dBµ input, 80% mod 0.4 2.0 %

V

1 Quiescent 0 0.3 V

SM

V

2 130 dBµ input 3.5 5.0 7.5 V

SM

1VSM= 1 V 18.0 24.0 30.0 dBµ

IN

BUF 320 380 mVrms

OSC

No. 1272-2/18

LA1135, 1135M

Reference Characteristics

Parameter Symbol Conditions typ Unit
Usable sensitivity Q.S. Input at S/N = 20 dB

Wide-band AGC
ON-state input

Detection output variation ∆V
Local oscillation variation

within broadcast band
Signal meter band * V

Selectivity 30 % mod ±10 kHz * 43 dB
IF interference IF. R. f
Image frequency

interference

O

∆V

OSC

SM-BW1

V

SM-BW2

IM. R. f

(2SK315 I
Reception 1.0 MHz quiescent

Interference 1.4 MHz non-mod
at input for AMT.D. ON

Input 74 dBµ → 130 dBµ 0.2 dB
V

L–V

OSC

74 dBµ input, frequency at
which output is reduced to 1/2

74 dBµ input, frequency at
which output is reduced to 1/10

= 600 kHz * 77.5 dB

r

= 1400 kHz * 52.0

r

=11mA)

DDS

H 15 mVrms

OSC

Note: *: Wide-band AGC OFF

( ): See circuit on page 7.

25.0 dBµ

82.0 dBµ

±1.5 kHz

–4.5/+7 kHz

(63.0)

dB

with 54 × 34 × 1.7 mm3PCB

Allowable power dissipation, Pd max – mW

Ambient temperature, Ta – °C

Equivalent Circuit Block Diagram

Pd max – Ta

No. 1272-3/18

Test Circuit 1

VCC=8V,fr= 1 MHz, fm= 400 Hz

Unit (resistance: Ω, capacitance: F)

HF valve voltmeter

LA1135, 1135M

DC voltmeter

Distortion

meter

Valve

voltmeter

V

O

Varactor diode SVC321 (Sanyo)
Narrow-band filter BFU450CN (Murata)

Sample Printed Circuit Pattern

Coil

T1 YT-30020 (Mitsumi)
T2 YT-30018 (Mitsumi)
T3 CFMA-027 (Toko)
T4 YT-30007 (Mitsumi)
T5 YT-30008 (Mitsumi)

Cu-foiled area 105 × 120 mm

2

No. 1272-4/18

Test Circuit 2

VCC=8V,fr= 1 MHz, fm= 400 Hz

LA1135, 1135M

DC voltmeter

Detection output

Probe load open

Distortion meter

Unit (resistance: Ω, capacitance: F)

Coil

T1 YT-30202 (Mitsumi)
T2 YT-30018 (Mitsumi)
T3 CFMA-021A (Toko)
T4 YT-30007 (Mitsumi)
T5 YT-30008 (Mitsumi)

Varactor diode SVC321 (Sanyo)

Narrow-band filter BFU450CN (Murata)

No. 1272-5/18

Proper cares in using IC

LA1135, 1135M

1. Bias condition: RF VCC% IF V

CC

2. Avoid coupling between the antenna tuning circuit and the local oscillation.

3. Connect detection capacitor C15 across pins 13 (output) and 14 (V

) so that no leakage of the IF signal to the GND line

CC

occurs. (If connected to GND, the tweet and the usable sensitivity may get worse.) Radiation from C15 may cause harmonics
in the IF signal to return to the RF stage, thereby leading to more tweet interference. So, connect C15 as close to pins 13, 14
as possible. Consider the direction of the capacitor and separate it from the ANT circuit.

4. For R9, use a semifixed resistor with V

considered.

SM

5. When designing the coils, consider the following conditions.
Shown below is the input level at each pin at which the detection output at f

ANT MIX IF Det

16.0 28.0 45.0 61.0

(dBµ)

= 400 Hz 30% mod becomes –25 dB.

m

How to apply input to each stage

ANT stage

MIX stage

ANT input

IF stage

Det stage

Unit (resistance: Ω, capacitance: F)

6. ANT damping
To make the ANT damping constant within the receiving band, change the application circuit as shown below.

Old circuit New circuit

Double tuning

Double tuning

Measures

Replace R1 with C

C

(2000 pF to 3000 pF or thereabouts)

D

.

D

Relocate L2.

Damping (600 kHz to 1400 kHz) Old circuit –15 dB

New circuit –4 dB

No. 1272-6/18