SANYO LA1065M Datasheet

LA1065M

Ordering number : EN3312

2 Tuner Diversity Circuit

for Car FM Tuner

Monolithic Linear IC

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

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

93097HA (KT)/2200TA, TS (AF) No.3312-1/8

Overview

The LA1065M is a multi-functional IC for 2 tuner diversity, and is capable of multi-path distortion detection with high sensitivity.

Functions

• Noise amplifier.

• Noise AGC circuit.

• Noise density comparison counting circuit.

• MAIN/SUB switching output.

• Weak electric field detection and antenna fixing circuit.

• Very strong electric field detection and antenna fixing circuit.

• S meter voltage comparison circuit.

Package Dimensions

unit: mm

3036B-MFP20

[LA1065M]

SANYO: MFP20

• AGC voltage output.

• S meter switch.

Specifications Maximum Ratings

at Ta=25°C

Parameter Symbol Conditions Ratings Unit Maximum supply voltage VCCmax 13 V Maximum flow-out current I(4) Pin 4 1 mA

I(5) Pin 5 1 mA I(6) Pin 6 1 mA I(9) Pin 9 10 mA I(12) Pin 12 100 µA

Maximum flow-in current I(7) Pin 7 1 mA

I(8) Pin 8 1 mA

Maximum applied voltage V(15) V

V(16) V

V(17) V

V(13) V

V(14) V

V Allowable power dissipation Pd max Ta=25°C 230 mW Operating temperature Topr –30 to +80 °C Storage temperature Tstg –40 to +125 °C

LA1065M

No.3312-2/8

Operating Conditions at Ta=25°C

Parameter Symbol Conditions Ratings Unit

Recommended supply voltage V

8 V

Operating voltage range VCCop 7 to 12 V

Operation Characteristics at Ta=25°C, V

=8V, f=100kHz sine wave

Parameter Symbol Conditions

Ratings

min typ max

Unit

Current drain I

No input, not including pin 9 current 10 16 22 mA

Pin 9 high-level voltage V

1kΩ resistance between pin 9 and GND 5.0 6.0 7.5 V

Noise amplifier gain G

sub

Vsub in=10mVrms pin 6 output 33 36 39 dB

Noise amplifier gain GV1 Vmain in=Vsub in=1mVrms pin 6 output 33 36 39 dB

GV2 Vmain in=Vsub in=100mV pin 6 output 6 10 14 dB Noise detection sensitivity NDS Noise AGC off 8 12 16 mVrms Noise count number NCN Difference between MAIN and SUB noise 4 Gate time 1 t

Noise AGC off 500 620 740 µs

Repeat cycle of pin 4 waveform Pin 6 voltage V6 Vmain=Vsub=200mVrms 0.4 1.1 2.0 V Pin 5 voltage V5 Vsub=100mVrms 2.50 2.85 3.20 V Strong field detection level V17 0.7 1.1 1.5 V Medium field detection level V14 2.4 2.7 3.1 V Weak field detection level V13 1.7 2.1 2.4 V S meter switch residual V12 Input=0V 130 mVrms

Equivalent Circuit Block Diagram

LA1065M

No.3312-3/8

Sample Application Circuit

Unit (resistance : Ω, capacitance : F)

Operating Principle

(1) Multi-path distortion detection

• Overview The LA1065M compares the high frequency noise elements in the S meter output from the two tuners to perform multi-path distortion detection. In addition to the higher harmonic distortion due to multi-path, the S meter noise includes pulse noise such as car engine ignition noise, distortion elements due to modulation, phase noise and so on. All of this noise causes misoperation of multi-path distortion detection. The LA1065M resolves this problem through use of a unique noise count comparison method and the bottom detection-type noise AGC.

• Noise count comparison The causes of misoperation in a diversity reception system, which are pulse noise, distortion elements caused by modulation, and phase noise, exist almost equally for MAIN and SUB. Also, the multi-path distortion to be detected tends to exist on either the MAIN or SUB side. The LA1065M uses an up/down counter to compare the noise counts of MAIN and SUB and detect multi-path.

• Bottom detection noise AGC As described above, the S meter noise also exists on both MAIN and SUB sides, so when there is noise on both sides, AGC goes on to prevent misoperation. On the other hand, when multi-path is generated and noise is on one side or the other, AGC does not go on, enabling high sensitivity detection.

• A combination of the above methods is used to make the LA1065M capable of accurate multi-path detection.

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