SANYO LA1867NM Datasheet

Ordering number : EN4619B

32096HA (OT)/D2593TS (OT) No. 4619-1/32

Overview

The LA1867M is a high-performance multifunction (FM­IF, noise canceller, MPX and MRC) single-chip tuner IC
for use in car radios. High-quality tuners with superlative
cost-performance characteristics can be constructed easily
using this IC.

Functions

• FM-IF

• Noise canceller

• MPX

• MRC (multipath noise reduction circuit)

Features

• Forms a high-performance FM tuner when combined
with the Sanyo LA1193 FM front-end IC.

• Multiple functions, MRC circuit, dual diversity, and
RDS handling

• High performance, high sensitivity and high stability
(excellent temperature characteristics)

• High audio quality and noise reduction according to the
reception conditions.

• Miniaturization of the required external capacitors
(electrolytic capacitors no longer required)

• Easy adjustment (The SD, muting and SNC circuits are
separated.)

Package Dimensions

unit: mm

3148-QIP44MA

SANYO: QIP44MA

[LA1867NM]

LA1867NM

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

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

Car Radio Single-Chip Tuner System

Monolithic linear IC

Specifications

Maximum Ratings at Ta = 25°C

Operating Conditions at Ta = 25°C

Parameter Symbol Conditions Rating Unit

Maximum supply voltage V

CC

max Pins 4 and 31 9.2 V
Allowable power dissipation Pdmax 740 mV
Operating temperature Topr –40 to +85 °C
Storage temperature Tstg –40 to +150 °C

Parameter Symbol Conditions Rating Unit

Recommended supply voltage

V

CC

Pins 4 and 31 8.0 V

V

CC ST/SD

Pins 29 and 44 5.0 V

Operating supply voltage range V

CC

op 7.0 to 9.0 V

Operating Characteristics at Ta = 25°C, VCC= 8.5 V (Note that these measurements are made using
the IC-51-044-464 IC socket manufactured by Yamaichi Electric Works, Ltd.)

Note: * Unless otherwise specified, with an IHF-BPF/T200 inserted in the pin 7 and 8 MPX output circuit.

No. 4619-2/32

LA1867NM

Parameter Symbol Conditions

Rating

Unit

min typ max
[FM BLOCK]
Quiescent current I

CCO-FM

No input (I4+ I31) 40 55 70 mA

Demodulator output V

O-FM

10.7 MHz, 100 dBµ, 1 kHz,

175 260 350 mVrms

100% mod, pin 7 output

Channel balance C

B

10.7 MHz,100 dBµ, 1 kHz, 100% mod, the
–1.0 0 +1.0 dB

ratio of pin 7 to pin 8, Referenced to pin 7.

Total harmonic distortion THD-

FMmono

10.7 MHz, 100 dBµ, 1 kHz,

0.2 1.0 %

100% mod, pin 7

Signal-to-noise ratio (IF) S/N-

FM

IF

10.7 MHz,100 dBµ, 1 kHz,

73 80 dB

100% mod, pin 7

AM suppression ration (IF) AMRIF

10.7 MHz,100 dBµ 1 kHz, fm = 1 kHz,

57 70 dB

Pin 7 when the AM modulation is 30%

Att-1

10.7 MHz, 100 dBµ, 1 k Hz, the pin 7

20 25 30 dB

attenuation when V

22

goes from 0 to 1 V

Muting attenuation

Att-2

10.7 MHz, 100 dBµ, 1 k Hz, the pin 7

28 33 38 dB

attenuation when V

22

goes from 0 to 2 V

Channel separation Separation

10.7 MHz, 100 dBµ, L + R = 90%,

30 40 dB

pilot = 10%, the pin 7 output ratio

Stereo on level ST-

ON

The pilot modulation level such that V

44

1.5 2.9 5.0 %

becomes less than 0.5 V*

Stereo off level ST-

OFF

The pilot modulation level such that V

44

0.8 1.9 %

becomes greater than 3.5 V*

Total harmonic distortion THD-

MainL

10.7 MHz, 100 dBµ, L + R = 90%,

0.3 1.0 %

pilot = 10%, pin 7

10.7 MHz, 100 dBµ, pilot = 10%

,

Pilot cancellation P

CAN

pin 7 signal/PILOT-LEVEL leakage, 20 35 dB
DIN-audio filter

SNC output voltage V

OSUB

10.7 MHz, 100 dBµ, L – R = 90%,

3 10 mVrms

pilot = 10%, V

13

= 0.1 V, pin 7

SNC output attenuation Att

SNC

10.7 MHz, 100 dBµ, L – R = 90%,

2 6 10 dB

pilot = 10%, V

13

= 3 V to 0.6 V, pin 7

Att

HCC-1

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

2 6 10 dB

pilot = 10%, V

14

= 3 V to 0.6 V, pin 7

HCC output attenuation

Att

HCC-2

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

6 10 14 dB

pilot = 10%, V

14

= 3 V to 0.1 V, pin 7

10.7 MHz, 100dBµ, 100% mod, IF input

Input limiting voltage Vi-lim

such that the input reference output is

33 42 51 dBµ

down by –3 dB, when the soft muting
function is operating

Muting sensitivity Vi-Mute

The IF unmodulated input level when

32 40 48 dBµ

V

23

is 2 V.

SD sensitivity SD

sen

The unmodulated IF input such that the SD

64 74 84 dBµ

pin voltage (V29) becomes 3.5 V or higher.

IF counter buffer output V

IFBUFF-FM

10.7 MHz, 100 dBµ, unmodulated,

160 230 320 mVrms

the pin 19 output

AM output V

O-AM

The pin 7 output in AM mode (AC2=

234 330 466 mVrms

300 mV rms, 1 kHz, the pin 20 input)

Continued on next page.

Continued from preceding page.

Block Functions

1. FM-IF

• IF-limiter amplifier

• S-meter outputs (three systems)

• Quadrature detector

• AF preamplifier

• AFC output

• Muting circuit (band mute, weak input mute, soft mute)

• Control pins (SD, muting attenuation, soft mute on level)

• SD output

• IF counter buffer output

• S-meter output shifter

2. Noise canceller

• Built-in high-pass filter

• Built-in low-pass filter delay circuit

• Noise AGC

• Pilot signal compensation circuit

• Noise reduction setting pin

• Noise canceller off in AM mode function

• High-pass filter “fc” control pin

No. 4619-3/32

LA1867NM

Parameter Symbol Conditions

Rating

Unit

min typ max

[FM BLOCK]

V

SMFM-1

No input, pin 32 DC output,

0.0 0.1 0.3 V

non-mod, SW-2 open

V

SMFM-2

50 dBµ, pin 32 DC output,

1.0 2.1 3.3 V

Signal meter output

non-mod, SW-2 open

V

SMFM-3

70 dBµ, pin 32 DC output,

2.3 3.5 5.3 V

non-mod, SW-2 open

V

SMFM-4

100 dBµ, pin 32 DC output,

4.7 6.0 6.7 V

non-mod, SW-2 open

Muting bandwidth BW-Mute

100 dBµ, The bandwidth when V

23

= 2 V,

110 190 290 kHz

non-mod

Muting drive output V

Mute-100

100 dBµ, pin 23 DC output, non-mod 0.00 0.03 0.20 V

[N.C BLOCK] Noise Canceller Input (pin 20), PG1

f = 1 kHz, 1 µs, with a 100 mV p-o pulse

t

GATE

1 input, the time for V40to become 1 V 35 55 75 µs

or higher

Gate time

f = 1 kHz, 1 µs, with a 100 mV p-o pulse

t

GATE

2 input, with the MRC pin 15 input = 1 kHz, 10 25 40 µs

30 mV rms
With a 1 kHz signal such that the noise

Noise sensitivity S

N

canceller operation is on, the 1 µs pulse 50 75 mVp-o
input level, measure pin 20.

[Multipath suppression circuit] MRC Input (AC1)

MRC output V

MRC

V18= 2 V, 1 kHz, 5 mV rms, the pin

1.75 1.85 1.95 V

12 voltage when there is a pin 15 input

MRC operating level MRC-ON

V

18

= 2 V, the pin 15 input level such

15 30 mVrms

that V12 becomes 1.75 V

3. MPX

• Nonadjusting VCO (912 kHz)

• Level-following type pilot cancelation circuit

• SNC

• FM HCC

• Stereo/mono display output

• Built-in anti-birdie stereo decoder

• Automatic stereo/mono switching

4. MRC

• DC level shifter circuit

• Noise amplifier

• Noise detection circuit

• Time constant control circuit

Block Features

1. FM-IF

• The development of a high performance S-meter circuit has simplified all types of control.
— High linearity S-meter circuit (6-stage detection type)
— High quality S-meter (superlative temperature characteristics)

• High quality design
— Design that emphasizes temperature characteristics
— S-meter, SD sensitivity, –3 dB L.S., etc.

• Improved active characteristics
— Muting circuit time constant control (Since the attack and recovery time can be set independently, the audio

quality under multipath conditions can be improved.)

— Three built-in S-meter circuits

Soft mute/HCCtime constants
SD time constants Application design is eased since these can all be set independently.
SNC time constants

2. Noise canceller

• Noise canceller error prevention when a narrow band (150 kHz) ceramic filter is used

• A new noise canceller system was developed.
— Reduced noise canceller errors during overmodulated signal reception.
— Reduced noise canceller errors under continuous noise conditions.

• Miniaturization of the required external capacitors

No. 4619-4/32

LA1867NM

3. MPX

• Miniaturization of the required external components (nonadjusting 912 kHz VCO)

• Improved basic performance
— Pilot cancelation level (30 dB typ.)
— No variation in mono output level due to separation adjustment (subcarrier output level adjustment type

separation adjustment)
— A new SNC curve was developed.
— Built-in anti-birdie filters (114 kHz and 190 kHz)
— Improved high region separation characteristics
— Improved stereo signal-to-noise ratio

4. MRC

• Controls the SNC and HCC circuit control signals by detecting the field strength (S-meter) and multipath noise.

No. 4619-5/32

LA1867NM

Test Circuit

No. 4619-6/32

LA1867NM

Block Diagram and Peripheral Circuits

No. 4619-7/32

LA1867NM

Pin Functions

FM-IF Block

No. 4619-8/32

LA1867NM

Continued on next page.

Pin Function Equivalent internal circuit Note

18

S-meter output for MRC
and SNC

32

S-meter output for muting
drive and HCC

30 S-meter output for SD
28

S-meter output shift control
pin

20 Noise canceller input
21 FM detector output

30 FM SD Adj

Constant current drive type
The slope can be changed by changing the
value of the S-meter output resistance.

The field strength can be shifted in the
positive or negative direction with an
external resistor on pin 28 without changing
the S-meter slope.

Noise canceller input
The input impedance is 50 kΩ.

FM detector output
Low impedance in FM mode

Pin 30
The comparison voltage is determined by
the external resistor.
Pin 30 is the S-meter output, and SD turns
on when it exceeds the internal supply
voltage.

Unit (resistance:Ω, capacitance:F)

Continued from preceding page.

No. 4619-9/32

LA1867NM

Continued on next page.

Pin Function Equivalent internal circuit Note

37 FM IF IN
36 IF BYPASS

23 Mute drive output
22 Mute input

33 FM mute ON Adj

Limited amplifier input
Select the capacitor grounding point
carefully.

➀ The muting time constants from the

external CR circuit are determined as
follows.

Attack time T

A

= R1× C

2

Release time TR= R2× C

2

➁ Noise convergence adjustment

Divide the V

23

voltage by R2when
there is no input at the antenna input,
and input that voltage to pin 22.

Noise convergence will be maximum
when V

22

= 2 V.
The variation range is 5 to 35 dB,
taking the 1 kHz 22.5 kHz dev output
as the reference.

➂ Muting off function

The muting is turned off when pin 22 is
shorted to ground.

The muting on level is adjusted by changing
the external resistance R.

Unit (resistance:Ω, capacitance:F)

Continued from preceding page.

No. 4619-10/32

LA1867NM

Pin Function Equivalent internal circuit Note

24 AFC
25 QD OUT
26 QD IN
27 V

REF

29 SD pin
30

SD sensitivity adjustment
pin

19

IF counter buffer
Seek/stop switch

• R

1

is the resistor that determines the band
muting bandwidth.
Increasing R

1

reduces the bandwidth.

Decreasing R

1

increases the bandwidth.

• Null voltage
When tuned, the voltage between pins 24
and 27 will be 0 V.

V24– V27= 0 V
The band muting is turned on when

| V24– V

27

| ≥ 0.7 V.

The SD output for the pin 30 SD.
R determines the SD sensitivity.

Pin 23 is coupled to the muting drive output.
SD operates when the switch is off.

This pin is used for both the IF counter
buffer (AC output) and the seek/stop switch
(DC input).

It is not coupled to the SD output.
The IF buffer is turned on and off by the pin
19 DC bias level.

Pin 19: high → buffer on, low → buffer off.

Unit (resistance:Ω, capacitance:F)