SANYO LA1780M Datasheet

Any and all SANYO products described or contained herein do not have specifications that can handle applications that require extremely high levels of reliability, such as life-support systems, aircraft’s control systems, or other applications whose failure can be reasonably expected to result in serious physical and/or material damage. Consult with your SANYO representative nearest you before using any SANYO products described or contained herein in such applications.

SANYO assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all SANYO products described or contained herein.

Overview

The LA1780M integrates all six blocks required in a car radio tuner on a single chip. The LA1780M is based on the LA1888NM, and features improvements to each of the blocks; improvements designed to provide improved noise characteristics, especially for noise related to multipath, three-signal intermodulation distortion, and two-signal suppression.

Functions

• FM front end

• FM IF

• Noise canceller

• Multiplex

• AM up-conversion

• FM/AM switch

• MRC

Features

• Improved noise reduction methods — The FM front end provides excellent 3-signal

characteristics equivalent to those of the LA1193M.

— Superlative listenability due to improved medium and

weak field noise canceller characteristics. — Improved separation characteristics — Anti-birdie filter — Improved AM and FM thermal characteristics — Excellent FM signal meter linearity — Modified N.C. circuit for improved noise rejection

• Double conversion AM tuner (up conversion) Reduces the number of external components required as compared to earlier double conversion tuners, in particular, no crystal is required (when used in conjunction with the LC72144).

• Sample-to-sample variation reduction circuit built into the FM IF circuit. (Fixed resistors are used for the SD, keyed AGC, mute on adjustment, ATT, SNC, and HCC functions.)

• Since the LA1780M retains the block structure of the LA1888NM, products using that IC can be easily converted, allowing further end product miniaturization.

Package Dimensions

Unit:mm

3159-QFP64E

Monolithic Linear IC

Ordering number : ENN5724A

33100TN (OT)/92498RM (OT) No. 5724-1/38

SANYO Electric Co.,Ltd. Semiconductor Company

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

Single-Chip Tuner IC for Car Radios

LA1780M

14.0

17.2

1.0

1.6

0.15

0.35

0.1

15.6

0.8

3.0max

2.7

14.0

17.2

1.0

1.6

0.8

Allowable power dissipation,

Pdmax — mW

Ambient temperature, Ta — °C

Mounted on a 40 × 80 × 1.3 mm

glass epoxy printed circuit board

Independent IC

SANYO: QFP64E (QIP64E)

[LA1780M]

Ratings

Parameter Symbol Conditions

min typ max

unit

[FM Characteristics] At the FM IF input Current drain I

CCO

-FM No input, I40 + I45 + I54 + I59 + I60 + I61 60 94 110 mA

Demodulation output V

-FM 10.7 MHz, 100dBµ, 1 kHz, 100%mod, The pin 15 output 205 310 415 mVrms

Pin 31 demodulation output V

-FM31 10.7 MHz, 100dBµ, 1 kHz, 100%mod, The pin 31 output 190 295 380 mVrms Channel balance CB The ratio between pins 15 and 16 at 10.7 MHz, 100 dBµ, 1 kHz –1 0 +1 dB Total harmonic distortion THD-FM mono 10.7 MHz, 100 dBµ, 1 kHz, 100% mod, pin 15 0.3 1 % Signal-to-noise ratio: IF S/N-FM IF 10.7 MHz, 100 dBµ, 1 kHz, 100% mod, pin 15 75 82 dB AM suppression ratio: IF AMR IF 10.7 MHz, 100 dBµ, 1 kHz, f

= 1 kHz, 30% AM, pin 15 55 68 dB

Att-1

10.7 MHz, 100 dBµ, 1 kHz. The pin 15 51015dB

attenuation when V33 goes from 0 to 2 V

Muting attenuation Att-2

10.7 MHz, 100 dBµ, 1 kHz. The pin 15

15 20 25 dB

attenuation when V33 goes from 0 to 2 V

Att-3

10.7 MHz, 100 dBµ, 1 kHz. The pin 15

28 33 38 dB

attenuation when V33 goes from 0 to 2 V

Separation Separation

10.7 MHz, 100 dBµ, L+R = 90%, pilot = 10%. The pin 15 output

30 40 dB

ratio Stereo on level ST-ON The pilot modulation such that V26 < 0.5 V 1.2 2.4 4.4 % Stereo off level ST-OFF The pilot modulation such that V26 > 3.5 V 0.6 1.6 % Main total harmonic distortion

THD-Main L 10.7 MHz, 100 dBµ, L+R = 90%, pilot = 10%. The pin 15 signal 0.3 1.2 %

Pilot cancellation PCAN

10.7 MHz, 100 dBµ, pilot = 10%. 20 30 dB

The pin 15 signal/the pilot level leakage. DIN audio

SNC output attenuation AttSNC

10.7 MHz, 100 dBµ, L-R = 90%, pilot = 10%.

159dB

V28 = 3 V → 0.6 V, pin 15

AttHCC-1

10.7 MHz, 100 dBµ, 10 kHz, L+R = 90%, pilot = 10%.

0.5 4.5 8.5 dB

HCC output attenuation

V29 = 3 V → 0.6 V, pin 15

AttHCC-2

10.7 MHz, 100 dBµ, 10 kHz, L+R = 90%,

61014dB

pilot = 10%. V29 = 3 V → 0.1 V, pin 15

Input limiting voltage Vi-lim

100 dBµ, 10.7 MHz, 30% modulation. The IF input such

33 40 47 dBµ

that the input reference output goes down by 3 dB

Muting sensitivity Vi-mute The IF input level (unmodulated) when V33 = 2 V 27 35 43 dBµ

SD-sen1 FM

The IF input level (unmodulated) (over 100 mV rms)

54 62 70 dBµ

SD sensitivity

such that the IF counter buffer output goes on

SD-sen2 FM 54 62 70 dBµ

IF counter buffer output V

IFBUFF-FM

10.7 MHz, 100 dBµ, unmodulated. The pin 23 output 220 330 440 mVrms

FM-1 No input. The pin 24 DC output, unmodulated 0.0 0.1 0.3 V

Signal meter output

FM-2 50 dBµ. The pin 24 DC output, unmodulated 0.4 1.0 1.5 V

FM-3 70 dBµ. The pin 24 DC output, unmodulated 2.0 2.7 3.5 V

FM-4 100 dBµ. The pin 24 DC output, unmodulated 4.7 5.5 6.2 V Muting bandwidth BW-mute 100 dBµ. The bandwidth when V33 = 2 V, unmodulated 100 150 200 kHz Mute drive output V

MUTE-100

100 dBµ, 0 dBµ. The pin 33 DC output, unmodulated 0.00 0.03 0.20 V

Operating Characteristics at Ta = 25°C, VCC= 8.0V, in the specified test cricuit for the FM IF input

Continued on next page.

No. 5724-2/38

LA1780M

Specifications

Maximum Ratings at Ta = 25°C

Operating Conditions at Ta = 25°C

Parameter Symbol Conditions Ratings Unit

Maximum supply voltage

1 max Pins 6, 40, and 61 9 V

2 max Pins 7, 45, 54, 59, and 60 12 V Allowable power dissipation Pd max Ta ≤ 55°C 950 mW Operating temperature Topr –40 to +85 °C Storage temperature Tstg –40 to +150 °C

Parameter Symbol Conditions Ratings Unit

Recommended supply voltage

Pins 6, 7, 40, 45, 54, 59, 60, and 61 8 V

ST IND Pin 26 5 V

Operating supply voltage range V

op 7.5 to 9.0 V

Ratings

Parameter Symbol Conditions

min typ max

unit

[FM FE Mixer Input N-AGC on input V

-AGC

83 MHz, unmodulated.

80 87 94 dBµ

The input such that the pin 2 voltage is 2.0 V or below

W-AGC on input VWAGC

83 MHz, unmodulated. The input such that the pin 2

100 106 112 dBµ

voltage is 2.0 V or below. (When the keyed AGC is set to 4.0 V.) Conversion gain A.V 83 MHz, 80 dBµ, unmodulated. The FE CF output 19 30 48 mVrms Oscillator buffer output V

OSCBUFFFM

No input 260 370 480 mVrms [NC Block] NC input (pin 30) Gate time τGATE1 f = 1 kHz, for a 1-µs, 100-mV p-o pulse 55 µs

Noise sensitivity SN

The level of a 1 = kHz, 1-µs pulse input that starts

40 mVp-o

noise canceller operation. Measured at pin 30.

The pulse rejection effect provided by the noise canceller. NC effect SN-NC

For a repeated 1-µs wide pulse, frequency = 10 kHz,

150 mV p-o. The ratio of the FM mode pin 15 output

referenced to the AM mode pin 15 output (effective value) [Multipath Rejection Circuit] MRC input (pin 27) MRC output VMRC V24 = 5 V 2.2 2.3 2.4 V

MRC operating level MRC-ON

The pin 32 input level at f = 70 kHz such that

10 15 20 mVrms

pin 24 goes to 5 V and pin 27 goes to 2 V [AM Characteristics] AM ANT input Practical sensitivity S/N-30 1 MHz, 30 dBµ, f

= 1 kHz, 30% modulation, pin 15 20 dB

Detector output V

-AM 1 MHz, 74 dBµ, fm= 1 kHz, 30% modulation, pin 15 85 120 170 mVrms

Pin 31 detector output V

-AM31 1 MHz, 74 dBµ, fm= 1 kHz, 30% modulation, pin 31 75 110 150 mVms

AGC F.O.M. V

AGC-FOM

1 MHz, 74 dBµ, referenced to the output, the input amplitude

56 61 66 dB

such that the output falls by 10 dB. Pin 15 Signal-to-noise ratio S/N-AM 1 MHz, 74 dBµ, f

= 1 kHz, 30% modulation 47 52 dB

Total harmonic distortion THD-AM 1 MHz, 74 dBµ, f

= 1 kHz, 80% modulation 0.3 1 %

Signal meter output

AM-1 No input 0.0 0.2 0.5 V

AM-2 1 MHz, 130 dBµ, unmodulated 3.8 4.8 6.2 V

Oscillator buffer output V

OSCBUFF AM1

No input, the pin 5 output 185 230 mVrms

Wide band AGC sensitivity

W-AGCsen1 1.4 MHz, the input when V46 = 0.7 V 83 89 95 dBµ W-AGCsen2 1.4 MHz, the input when V46 = 0.7 V (seek mode) 74 80 86 dBµ

SD sensitivity

SD-sen1 AM

1 MHz, the ANT input level such that the IF counter output turns on.

26 32 38 dBµ

SD-sen2 AM

1 MHz, the ANT input level such that the SD pin goes to the on state.

26 32 38 dBµ

IF buffer output V

IFBUFF-AM

1 MHz, 74 dBµ, unmodulated. The pin 23 output 200 290 mVrms

No. 5724-3/38

LA1780M

Note: These measurements must be made using the either the IC-51-0644-824 or KS8277 IC socket (manufactured by Yamaichi Electronics).

* 1. When the resistor between pin 58 and ground is 200 kΩ. * 2. When the resistor between pin 58 and ground is 30 kΩ.

Continued from preceding page.

No. 5724-4/38

LA1780M

Parameter Symbol

Switch states

SW1 SW2 SW3 SW4 SW5 SW6 SW7 SW8 SW9 SW10

Current drain I

CCO

-FM ON b OFF b — ON OFF OFF ON —

Demodulation output V

-FM ON b OFF b — ON OFF OFF ON —

Pin 31 demodulation output V

-FM31 ON b OFF b — ON OFF OFF ON — Channel balance CB ON b OFF b — ON OFF OFF ON — Total harmonic distortion THD-FMmono ON b OFF b — ON OFF OFF ON — Signal-to-noise ratio: IF S/N-FM IF ON b OFF b — ON OFF OFF ON — AM suppression ratio: IF AMR IF ON b OFF b — ON OFF OFF ON — Muting attenuation 1 Att-1 ON b OFF b — ON OFF OFF ON — Muting attenuation 2 Att-2 ON b OFF b — ON OFF OFF ON — Muting attenuation 3 Att-3 ON b OFF b — ON OFF OFF ON — Separation Separation ON b OFF b — ON OFF OFF ON — Stereo on level ST-ON ON b OFF b — ON OFF OFF ON — Stereo off level ST-OFF ON b OFF b — ON OFF OFF ON — Main total harmonic distortion

THD-Main L ON b OFF b — ON OFF OFF ON — Pilot cancellation PCAN ON b OFF b — ON OFF OFF OFF/ON — SNC output attenuation AttSNC ON b OFF b — ON OFF OFF ON — HCC output attenuation 1 AttHCC-1 ON b OFF b — ON OFF OFF ON — HCC output attenuation 2 AttHCC-2 ON b OFF b — ON OFF OFF ON — Input limiting voltage Vi-lim ON b OFF b — ON OFF OFF ON ON Muting sensitivity Vi-mute ON b OFF b — ON OFF OFF ON — SD sensitivity 1 SD-sen1 FM ON b OFF b OFF OFF OFF OFF ON — SD sensitivity 2 SD-sen2 FM ON b OFF b ON OFF OFF OFF ON — IF counter buffer output V

IFBUFF-FM

ON b OFF b OFF OFF OFF OFF ON —

Signal meter output 1 V

FM-1 ON b OFF b — ON OFF OFF ON —

Signal meter output 2 V

FM-2 ON b OFF b — ON OFF OFF ON —

Signal meter output 3 V

FM-3 ON b OFF b — ON OFF OFF ON —

Signal meter output 4 V

FM-4 ON b OFF b — ON OFF OFF ON — Muting bandwidth BW-mute ON b OFF b — ON OFF OFF ON — Mute drive output V

MUTE-100

ON b OFF b — ON OFF OFF ON —

N-AGC on input V

NAGC

ON a ON b — ON OFF OFF — —

W-AGC on input V

WAGC

ON a ON b — ON OFF OFF — — Conversion gain A.V ON a ON b — ON OFF OFF — — Oscillator buffer output V

OSCBUFFFM

ON a ON b — ON OFF OFF — — Gate time 1 τGATE1 ON — OFF a — ON OFF OFF — — Noise sensitivity SN ON — OFF a — ON OFF OFF — — NC effect SN-NC ON/OFF — OFF a — ON OFF OFF — — MRC output V

MRC

ON — OFF b — ON OFF OFF — — MRC operating level MRC-ON ON — OFF b — ON OFF OFF — — Practical sensitivity S/N-30 OFF — OFF b ON ON — — — — Detection output V

-AM OFF — OFF b ON ON — — — —

Pin 31 detection output V

-AM31 OFF — OFF b ON ON — — — —

AGC F.O.M. V

AGC-FOM

OFF — OFF b ON ON — — — — Signal-to-noise ratio S/N-AM OFF — OFF b ON ON — — — — Total harmonic distortion THD-AM OFF — OFF b ON ON — — — — Signal meter output 1 V

AM-1 OFF — OFF b ON ON — — — —

Signal meter output 2 V

AM-2 OFF — OFF b ON ON — — — —

Oscillator buffer output V

OSCBUFF AM-1

OFF — OFF b ON ON — — — — Wide band AGC sensitivity 1 W-AGCsen 1 OFF — OFF b ON ON — — — — Wide band AGC sensitivity 2 W-AGCsen 2 OFF — OFF b ON ON — — — — SD sensitivity 1 SD-sen1 AM OFF — OFF b OFF OFF — — — — SD sensitivity 2 SD-sen2 AM OFF — OFF b OFF OFF — — — — IF buffer output V

IFBUFF-AM

OFF — OFF b OFF OFF — — — —

Test Conditions

Block Diagram

No. 5724-5/38

LA1780M

IF limiter amplifier

Function List

FM Front End (Equivalent to the Sanyo LA1193)

• Double input type double balanced mixer

• Pin diode drive AGC output

• MOSFET second gate drive AGC output

• Keyed AGC adjustment pin

• Differential IF amplifier

• Wide band AGC sensitivity setting pin, and narrow band AGC sensitivity setting pin

• Local oscillator

FM IF

• IF limiter amplifier

• S-meter output (also used for AM) 6-stage pickup

• Multipath detection pin (shared FM signal meter)

• Quadrature detection

• AF preamplifier

• AGC output

• Band muting

• Weak input muting

• Soft muting adjustment pin

• Muting attenuation adjustment pin

• IF counter buffer output (also used for AM)

• SD (IF counter buffer on level) adjustment pin

• SD output (active high) (also used for AM)

Noise Canceller

• High-pass filter (first order)

• Delay circuit based low-pass filter (fourth order)

• Noise AGC

• Pilot signal compensation circuit

• Noise sensitivity setting pin

• Function for disabling the noise canceller in AM mode

Multiplex Functions

• Adjustment-free VCO circuit

• Level follower type pilot canceller circuit

• HCC (high cut control)

• Automatic stereo/mono switching

• VCO oscillation stop function (AM mode)

• Forced monaural

• SNC (stereo noise controller)

• Stereo display pin

• Anti-birdie filter

• Double balanced mixer (1st, 2nd)

• IF amplifier

• Detection

• RF AGC (narrow/wide)

• Pin diode drive pin

• IF AGC

• Signal meter output (also used for FM)

• Local oscillator circuits (first and second)

• Local oscillator buffer output

• IF counter buffer output (also used by the FM IF)

• SD (IF counter buffer on level) adjustment pin

• SD output (active high) (also used for AM)

• Wide AGC

• Detection output frequency characteristics adjustment pin (low cut, high deemphasis)

• AM stereo buffer

MRC (multipath noise rejection circuit) AM/FM switching output (linked to the FM VCC)

No. 5724-6/38

LA1780M

Pin No. Function Description Equivalent circuit

3 F.E.GND

Pin Descriptions

No. 5724-7/38

LA1780M

62 pin

An antenna damping current flows

1 Antenna damping drive when the RF AGC voltage (pin 2)

reaches V

CC-VD

2 RF AGC

Used to control the FET second gate.

Oscillator connection

4 OSC

The transistor and capacitors required for the oscillator circuit are integrated on the chip.

AM first oscillator

7 AM OSC

This circuit can oscillator up to the SW band. An ALC circuit is included.

Continued on next page.

No. 5724-8/38

LA1780M

Pin No. Function Description Equivalent circuit

13 Pilot input Pin 13 is the PLL circuit input pin.

14 N.C, MPX, MRC, GND

Ground for the N.C., MPX, and MRC circuits.

After setting up the medium field

(about 50 dBµ) sensitivity with the 8 Noise AGC sensitivity noise sensitivity setting pin (pin 8), 9 AGC adjustment set the weak field (about 20 to

30 dBµ) sensitivity with the AGC

adjustment pin (pin 9)

11 Memory circuit connection Recording circuit used during 12 Memory circuit connection noise canceller operation.

Continued from preceding page.

Continued on next page.

Differential

amp

Gate

circuit

No. 5724-9/38

LA1780M

Pin No. Function Description Equivalent circuit

15 MPX output (left)

Deemphasis

16 MPX output (right)

50 µs: 0.015 µF

75 µs: 0.022 µF

Adjustment is required since the

pilot signal level varies with the

17 Pilot canceller signal output sample-to-sample variations in

the IF output level and other

parameters.

18 Pilot canceller signal output

Pin 18 is the output pin for the

pilot canceller signal.

Continued from preceding page.

Continued on next page.

No. 5724-10/38

LA1780M

Pin No. Function Description Equivalent circuit

20 VCO The oscillator frequency is 912 Hz.

KBR-912F108

(Kyocera Corporation)

CSB-912JF108

(Murata Mfg. Co., Ltd.)

Composite signal

Use a trimmer

to adjust the

Separation subdecoder input level. adjustment pin (The output level is not modified in

mono and main modes.)

21 PHASE COMP. 22 PHASE COMP.

Continued from preceding page.

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No. 5724-11/38

LA1780M

Pin No. Function Description Equivalent circuit

Forced SD: 2.5 V

SD circuit

IF counter

buffer

S-meter

Outputs a 1-mA current during AM reception

Stereo

indicator

Seek/stop

switching

Continued from preceding page.

Continued on next page.

This pin functions both as the IF

counter buffer (AC output) and as

the seek/stop switch pin.

The voltage V23 switches

between the following three

modes.

IF counter buffer seek/stop During FM reception: switching 5 V: Seek mode

2.5 V: Forced SD mode

0 V: Reception mode

AM reception

(two modes: 0 and 5 V) 5 V: Seek mode 0 V: Reception mode

24 AM/FM signal meter Fixed-current drive signal meter

output

In AM mode, pin 32 outputs a

32 Dedicated FM signal meter 1-mA current. Thus the HCC

circuit is turned off.

FM reception: the voltage V23 switches between three modes as follows. 5 V: The SD pin operates linked

to the IF counter buffer.

26 Stereo indicator for the SD pin

2.5 V: Forced SD mode: operates

as the SD pin. 0 V: Reception mode: stereo

indicator AM reception: (two modes: 0 and 5 V) 5 V: Operates as the seek SD pin. 0 V: Reception mode. Not used.

No. 5724-12/38

LA1780M

Pin No. Function Description Equivalent circuit

Pin 28

Continued from preceding page.

Continued on next page.

The MRC detector time constant

27 MRC control voltage time

is determined by a 1-kΩ resistor

constant

and C2 when discharging and by the 7-µA current and C2 when charging.

28 SNC control input

The sub-output is controlled by a 0 to 1-V input.

The high band frequency output is controlled by a 0 to 1-V input.

It can also be controlled by the

29 HCC control input MRC output.

Use a resistor of at least 100 kΩ when controlling with the pin 32 FM S-meter signal.

MRC input

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