Datasheet LA1135, LA1135M Datasheet (SANYO)

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Page 1

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

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

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

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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

Pd max LA1135 730 mW

op 7.5to12 V

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

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

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

2 130 dBµ input 20.0 30.0 41.0 mA

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

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

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 %

1 Quiescent 0 0.3 V

2 130 dBµ input 3.5 5.0 7.5 V

1VSM= 1 V 18.0 24.0 30.0 dBµ

BUF 320 380 mVrms

OSC

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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

∆V

OSC

SM-BW1

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

= 1400 kHz * 52.0

=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)

with 54 × 34 × 1.7 mm3PCB

Allowable power dissipation, Pd max – mW

Ambient temperature, Ta – °C

Equivalent Circuit Block Diagram

Pd max – Ta

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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

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

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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)

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Proper cares in using IC

LA1135, 1135M

1. Bias condition: RF VCC% IF V

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

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.

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.

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

Measures

Replace R1 with C

(2000 pF to 3000 pF or thereabouts)

Relocate L2.

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

New circuit –4 dB

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LA1135, 1135M

7. Meaning of L2 If the RF stage is double-tunned, the difference in sensitivity within the RF band almost disappears, but an antireasonance point of approximately 20 MHz appears, thereby leading to worse spurious characteristics. So, L2 is used to remove the SW band.

8. Wide-band AGC This IC contains 2-channel wide-band AGC. Pin 6 detects an undesired signal within the RF band and wide-band AGC is applied. This detection sensitivity is determined inside the IC. Pin 2 detects an undesired signal outside the RF band. This detection sensitivity is determined by R3. When 1 mVrms (f = 1 MHz) signal is applied to pin 2, AGC operates.

9. Measures against suppression of sensitivity In the AGC circuit of the test circuit the presence of an undesired signal of high strength within the receiving band may cause the desired signal to be suppressed when the desired signal is low or medium in strength. Shown below is the circuit configuration where the necessary measures are taken against this suppression.

S meter output

Wide-band

AGC input

Wide-band

AGC

circuit

Circuit added

Sample constants

= 4.3 kΩ

= 3.0 kΩ

-130 = 5.0 V)

damping pin

ANT

damping

driver circuit

10. Transient response of S meter output at search, stop mode The circuit configuration shown below is available to stabilize the transient response of the S meter output at the search, stop mode.

Signal during searching from PLL

Unit (resistance: Ω)

11. When using LW (approximately 50°C or greater), additionally connect a resistor of 27 kΩ across pins 18 and 19 against increase in local oscillation level. When using MW, no additional resistor is required.

12. Improvement in image frequency interference Change the RF double-tuning coil as follows, and the image frequency interference becomes 63 dB at f

= 1400 kHz.

(Q of the tuning circuit must not be decreased with resistor 100 kΩ.)

Continued on next page.

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Continued from preceding page.

LA1135, 1135M

Wide-band AGC OFF

Usable sensitivity S/N 20 dB

Maximum sensitivity at –25 dB output

Tracking at each point

Image frequency interference – dB

Usable sensitivity, Maximum sensitivity – dBµ

Receiving frequency, fr– kHz

Unit (resistance: Ω, capacitance: F)

Specification for coil

YT-30202(Mitsumi) 1-3 84T 4-6 17T

2157-2239-649 (Sumida) 7BRS-9286A (Toko)

13. The variations (especially in case of small coupling coefficient) in the oscilation coil may cause a parasitic oscillation of approximately 100 MHz to occur at the local oscillation buffer output (pin 20) at low temperatures. In this case, connect a capacitor of 30 pF or greater across pin 20 and GND. (When the oscillation coil is used with no tap, no problem arises.)

14. The recommended double-tuning circuit has a loose coupling at 2T. Therefore, the change in the total number of turns may affect the coupling coefficient subtly, causing a tight coupling and making the selectivity characteristic double-humped. Especially for a receiving band of 1400 kHz or more, the tracking method may affect the band characteristic of sensitivity and the cross modulation characteristic considerably. When making a design, check to see if critical coupling occurs or not.

15. Sensitivity difference at 600 kHz or less In the application circuit configuration shown below, the bypass capacitor in the position where the tuning voltage is applied and coupling L for double-tuning may cause an antiresonance point of 400 kHz to 600 kHz depending on the variations in the coil, varactor diode, etc. The value of the bypass must be 0.047 µF or greater. The recommended value is 0.1 µF.

Unit (resistance: Ω, capacitance: F)

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LA1135, 1135M

16. Measure against suppression of sensitivity in the presence of an undesired signal of high strength (Sample application where two PIN diodes are used in the antenna damping circuit) The LA1135 contains the wide-band AGC circuit (wide-band AGC with pin 2 input) against cross modulation which occurs because an undesired signal of high strength distorts the FET input. The AGC = ON level depends on the value of external resistor R3 as shown below.

Test conditions

Double-tuning

W.B.AGC-ON level – dBµ

ANT input level at which ANTD is turned ON when

= 1.4 MHz is inputed at fr= 1 MHz

Resistor value, R – Ω

When a nonlinear element, such as transistor, is used for antenna damping, cross modulation which occurs when the transistor is turned ON is as shown below.

Cross Modulation Characteristics

Cross modulation characteristic which is caused by the ANT Tr when the LA1135 wide-band AGC-ON level (with pin 2 input) is varied

Doubletuning

Desired:1.0 MHz 400 Hz 30% mod 74 dBµ Undesired: 1.4 MHz non-mod

Wide-band AGC (pin 2 input)75Ω

Desired: 1.0 MHz 400 Hz

non-mod 74 dBµ

Undesired: 1.4 MHz 1 kHz

80% mod

Output – dB

Cross modulation which occurs when the transistor for ANT damping is turned ON

Unit (resistence: Ω, capacitance: F)

Undesired input – dBµ

The dynamic range of the FET input covers up to approximately 110 dBµ of antenna input, but the AGC-ON level must be set lower because of the bad effect shown above. Therefore, there are some cases where it is difficult to receive a desired signal of low strength in the presence of an an undesired signal of high strength. To solve this problem, a sample application circuit where two PIN diodes with good linearity are used for antenna damping and its cross modulation characteristic are shown below.

Sample Application Circuit where two PIN diodes are used for ANT damping

Equivalent capacitance available (Capacitance is desirable because of a slight change in ANT damping in the band)

(Approximately 3000 pF)

Doubletuning

Unit (resistance: Ω, capacitance: F)

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LA1135, 1135M

Cross Modulation Characteristics

Desired: 1.0 MHz fm= 400 Hz 30% mod Undesired: 1.4 MHz non-mod

Desired: 1.0 MHz non-mod

Output – dB

Undesired: 1.4 MHz f

Pin 2 input W.B.AGC External pickup R3 = 5 Ω

= 1 kHz 80% mod

Undesired input – dBµ

17. For details of the LA1135 wide-band AGC, refer to Technical Data No.79.

External Parts

(1) RF double-tuning coil Primary

Application where two PIN diodes are used for ANT damping

Secondary

(2) OSC coil

(3) IFT (I)

YT-30020 (Mitsumi) 2157-2239-518A (Sumida) 7BRS-8934A (Toko) 1–2 2T 2T 2T 6–4 37T 40T 35T 2–3 82T 90T 75T

YT-30018 (Mitsumi) 2157-2239-517A (Sumida) 7BRS-8932A (Toko) 1–2 2T 2T 2T 6–4 15T 16T 14T 2–3 82T 90T 75T

YT-30008 (Mitsumi) 2157-2239-516 (Sumida) 7BR-5941Y (Toko) 1–2 29T 34T 29T 2–3 29T 35T 29T

High selectivity type

CFMA-027 (Toko) 1–2 69T 2–3 77T 4–6 14T

Center frequency 450 kHz Qu=115±20% Tuning capacitance 180 pF

YT-30042 (Mitsumi)

+SFP450H (Murata) 1–2 49T 4–6 27T 2–3 103T

Center frequency 450 kHz Qu=45±20% Tuning capacitance 180 pF

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(4) IFT (II)

1–2 115T 111T 110T 4–6 6T 6T 6T 2–3 37T 36T 36T

(5) Varactor diode: SVC321 (6) FET at RF stage: 2SK315 F, G

2SK427 T, U

(7) Transistor for AGC

FET AGC: 2SC536 F, G ANT damping: 2SC930 E

(8) Narrow-band resonator BFU450CN Murata

LA1135, 1135M

YT-30007 (Mitsumi) 4140-1289-164 (Sumida) 7MC-6272N (Toko)

Center frequency 455 kHz, Qu = 110% Tuning capacitance 180 pF

Center frequency 455 kHz Qu = 110% Tuning capacitance 180 pF

Center frequency 455 kHz, Qu = 110% Tuning capacitance 180 pF

Output – dBm

Signal characteristic f

Overall Characteristics

Detection output at 30% mod

Input voltage – dBµ

Tweet Input Characteristics

= 900 kHz fm= 400 Hz 30% mod

Complete tuning (Beat max. at 900 kHz tuning)

–V

THD–% V

Tracking at each point

Wide-band AGC cutoff

M.S., Q.S. – dBµ

Band Characteristics

IF interference

Image frequency interference

Input at 20 dB S/N

Input at –25 dBm output

–dB

–74

Output – dBµ

Complete tuning (Zero beat)

ANT input – dBµ

Total harmonic distortion, THD – % IF interference, image frequency interference, S/N

Receiving frequency, fr– kHz

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LA1135, 1135M

– dBm

O-74

Detection output, V

Detuning Characteristics

Vary VTso that tweet output is maximized at each point.

Frequency deviation, ∆f– kHz

THD–f

Detection output 30% mod

Spurious Characteristics

Difference in input at –25 dBm output

Output – dBµ

Receiving frequency, fr–Hz

Detection Output, THD – Modulation Characteristics

Input: 74 dBµ

Output – dBµ

Detection output

Total harmonic distortion, THD – %

Selectivity – dB

–V

fm–Hz

Selectivity Characteristics

W.B.AGC

Difference in input at –25 dBm output

operation

Frequency deviation, ∆f – kHz

Detuning Characteristics

Using narrow-band filter

Output – mVrms

Output – dBm

Distortion

Modulation – %

Detuning Characteristics

Detection output 30% mod

Noise

THD–%

S meter output, V

Frequency deviation, ∆f – kHz

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LA1135, 1135M

– dBm

Output, V

–mA

,THD–V

Detection output-Input: 74 dBµ

Detection output

Supply voltage, V

CC–VCC

–V

Quiescent

VSM–V

Input: 130 dBµ

–V

S meter output, V

Total harmonic distortion, THD – %

Using narrow-band filter

Supply voltage, VCC–V

∆f–V

OSC coil 1/2 tap

Current drain, I

–mV

OSC

Supply voltage, V

OSC–VCC

–V

OSC coil 1/2 tap

Supply voltage, VCC–V

Frequency deviation, ∆f – kHz

Supply voltage, V

–V

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LA1135, 1135M

–V

SM-47

SM-130

S meter output,

ANT D ON input – dBµ

W.B.AGC ON input – dBµ

–mA

Temperature Characteristics

VSM=1V input

= 1V input – dBµ

–V

AGC-0

Temperature Characteristics

Usable sensitivity (Input at 20 dB S/N)

– dBm

O-74

Maximum sensitivity, MS – dBµ

–dBV

–74

S/N

– mVrms

Current drain, I

Ambient temperature, Ta – °C

Total harmonic distortion, THD – % Usable sensitivity, Q.S. – dBµ

Cross Modulation Characteristics Testing Method

2-signal pad JIS Dummy ANT

Desired signal ANT input

Output

Desired signal ANT input

Solid line —— Interference Dotted line ---- No interference

OSC

Ambient temperature, Ta – °C

Unit (resistance:Ω, capacitance: F)

A: Desired signal 80 dBµ 400 Hz 30% mod.

The strength of an undesired signal (non-mod) causes the desired signal to be suppressed.

B: Desired signal 80 dBµ non-mod.

The strength of an undesired signal (400 Hz 80% mod) causes interference to occur.

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LA1135, 1135M

Desired 1.0 MHz

Undesired 1.4 MHz

Output – dBµ

Cross Modulation Characteristics

400 Hz 30% mod

non mod

Desired input 80 dBµ

dBµ

Desired input 40

Desired 1.4 MHz

Undesired 1.44 MHz

Desired input 40 dBµ

Output – dBµ

Cross Modulation Characteristics

400 Hz 30% mod

non mod

Desired input 90 dBµ

Desired 1.0 MHz Undesired

Undesired input – dBµ

non mod

1.4 MHz 400 Hz 80% mod

Desired 1.4 MHz Undesired

Undesired input – dBµ

non mod

1.44 MHz 400 Hz 80% mod

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LA1135, 1135M

Specification for LA1135 loop ANT

(1) Features of specification for LA1135 loop ANT

1) Excellent high-input characteristic The antena damping circuit prevents the antena circuit from being magnetic-saturated, which results in worsened characteristic, at a high input.

2) Excellent cross modulation characteristic

(2) Application circuit

DC voltmeter

HF valve voltmeter

Distortion meter

Valve voltmeter

(3) Circuit configuration and connection

3-1 Circuit configuration

3-2 Connection (bottom view)

Unit (resistance: Ω, capacitance: F)

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3-3 Pin name

LA1135, 1135M

Pin No. Pin Name

1 Loop ANT 2 Loop ANT 3 RF AMP GND side 4NC 5NC

Pin No. Pin Name

6NC 7NC 8 Local OSC

9 RF output 10 Tuning voltage 11 Local OSC

(4) Specification

Receiving frequency band MW BAND Tuning voltage 1 to 9 V Loop ANT 42579719100 (LA-1500), 4257976000 (LA-100A) (Korin) IC LA1135

Overall Characteristics

Detection output at 30% mod

–V

Output – dBµ

THD–%

Output – dBµ

Band Characteristics

IF interference

Image frequency interference

S/N 20 dB sensitivity

Input voltage – dBµ

Detection Output, THD – Modulation Degree

Input 74 dBµ

Detection output V

Output – mV

Modulation degree – %

–mW

OSC

THD–%

Input at V

= –25 dBm

Receiving frequency – kHz

THD–%

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LA1135, 1135M

Output – dBµ

Detuning Characteristics

Detection output

Input 74 dBµ

Selectivity – dB

–mW

OSC

Selectivity Characteristics

Frequency deviation – kHz

OSC–VCC

Frequency deviation – kHz

∆f–V

Supply voltage, VCC–V

Frequency deviation, ∆f – kHz

Supply voltage, VCC–V

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: 1 Accept full responsibility and indemnify and defendSANYOELECTRICCO.,LTD.,itsaffiliates, 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:

2 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 September,1997.Specificationsandinformationhereinaresubjecttochangewithoutnotice.

No. 1272-18/18