SANYO LA1145M, LA1145 Datasheet

Ordering number: EN 2725A

Monolithic Linear IC

LA1145, 1145M

FM IF System (Quadrature Detector) for Car Radio

Features

1. On-chip IF count buffer circuit and microprocessor­controlled switch circuit for ETR.

2. Compared to the LA1140, the LA1145, 1145M offer:

1 Improved signal meter output linearity;
2 Improved band mute temperature stability;
3 Improved S/N ratio;
4 Improved sound quality at weak signal input when

noise is present, and;

5 Improved AMR characteristics during weak signal

input.

3. Reduced parts’ count simplifies design:

1 On-chip IF count buffer circuit;
2 On-chip SD circuit — sensitivity can be set

independently of soft mute characteristics, and;

3 Variable S-meter gradient — three pin S-meter output

(pins 5, 16 and 17) facilitates independent control of
SNC and HCC.

Package Dimensions

unit : mm

3115-SIP18Z

[LA1145]

SANYO : SIP18Z

unit : mm

3036B-MFP20

[LA1145M]

SANYO: MFP20

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

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

93097HS(II)/3132TS/2118TA No.2725-1/17

LA1145, 1145M

Specifications

[LA1145]
Maximum Ratings atTa=25°C

Parameter Symbol Conditions Ratings Unit
Maximum supply voltage V
Maximum supply current I
Allowable power dissipation Pd max Ta = 65 °C 630 mW

Operating temperature Topr –20 to +70 °C
Storage temperature Tstg –40 to +150 °C

Operating Conditions atTa=25°C

Parameter Symbol Conditions Ratings Unit
Recommended supply voltage V
Operating voltage range V

Operating Characteristics at Ta = 25°C,VCC=8V,fin= 10.7 MHz

max Pin 12 14 V

CC

max Pin 12 45 mA

CC

Ta = 70°C 590 mW

8V

7.5 to 14 V

CC

CC

op

Parameter Symbol Conditions min typ max Unit
Quiescent current I
Current drain I
Demodulation output V

Total harmonic distortion THD
Signal-to-noise ratio S/N V

Input limiting voltage V
Muting sensitivity V
Muting bandwidth BW(mute) V

Muting attenuation

Signal strength indication output

Muting drive output
AM rejection ratio AMR V
Offset voltage
SD sensitivity V

IF count output level V

CCO

CC

O

(lim) 400 Hz tone, 100%, soft mute ON 34 40 46 dBµ

IN

(mute) V15= 2 V 30 36 42 dBµ

IN

mute(1)

mute(2)

V

16-0

V

16-50

V

16-70

V

16-100

V

15-0

V

15-100

V

7-11

V

8-11

SD

(IF) VIN= 100 dBµ, pin 13, CL= 10 pF 110 180 280 mVrms

IN

[LA1145M]

VIN= 0 dBµ 18 26 36 mA
VIN= 100 dBµ 20 29 36 mA
VIN= 100 dBµ, 400 Hz tone, 100% 300 400 520 mVrms

= 100 dBµ, 400 Hz tone, 100%,

V

IN

single tuning coil

= 100 dBµ, 400 Hz tone, 100% 79 85 dB

IN

= 100 dBµ, V18% 0.3 V 140 190 280 kHz

IN

V

= 100 dBµ, V15=2V,

IN

400 Hz tone, 100%

= 100 dBµ, V15=4V,

V

IN

400Hz tone, 100%
VIN= 0 dBµ, RA=10kΩ, pin 16 0 0.1 0.4 V
VIN= 50 dBµ, RA=10kΩ, pin 16 1.4 2.3 3.2 V
VIN= 70 dBµ, RA=10kΩ, pin 16 2.5 4.5 5.5 V
VIN= 100 dBµ, RA=10kΩ, pin 16 5.0 5.5 6.0 V
VIN= 0 dBµ, pin 15 4.0 4.8 5.5 V
VIN= 100 dBµ, pin 15 0 0 0.3 dB

= 100 dBµ, 1 kHz tone, 30% AM 57 70 dB

IN

VIN= 0 dBµ, pins 7 to 11 –0.25 0 +0.25 V
VIN= 0 dBµ, pin 8 to 11 –0.5 0 +0.5 V
Pin 18 50 58 66 dBµ

0.3 0.8 %

10 15 20 dB

25 29 33 dB

Maximum Ratings atTa=25°C

Parameter Symbol Conditions Ratings Unit
Maximum supply voltage V
Maximum supply current I
Allowable power dissipation Pd max Ta = 70°C, mounted on PC board,

Operating temperature Topr –20 to +70 °C
Storage temperature Tstg –40 to +125 °C

max Pin 13 14 V

CC

max Pin 13 45 mA

CC

independent IC
Ta = 25°C, mounted on PC board,

Independent IC

630 mW

630 mW

No. 2725-2/17

LA1145, 1145M

Operating Conditions at Ta = 25°C

Parameter Symbol Conditions Ratings Unit
Recommended supply voltage V
Operating voltage range V

Operating Characteristics at Ta = 25 °C, VCC=8V,fin= 10.7 MHz

Parameter Symbol Conditions min typ max Unit
Quiescent current I
Current drain I
Demodulation output V

Total harmonic distortion THD
Signal-to-noise ratio S/N V

Input limiting voltage V
Muting sensitivity V
Muting bandwidth BW (mute) V

Muting attenuation

Signal strength
indication output

Muting drive output
AM rejection ratio AMR V
Offset voltage
SD sensitivity V
IF count output level

CC

op 7.5to 14 V

CC

CCO

CC

IN

(mute) V16= 2 V 30 36 42 dBµ

IN

mute (1)

mute (2)

V

17-0

V

17-50

V

17-70

V

17-100

V

16-0

V

16-100

V

8-12

V

9-12

SD

V

-On VIN= 100 dBµ, pin 14, CL= 10 pF 110 180 280 mVrms

IF

V

-OFF VIN= 100 dBµ, pin 14, CL=10pF 1 3 mVrms

IF

VIN= 0 dBµ 18 26 36 mA
VIN= 100 dBµ 20 29 40 mA
VIN= 100 dBµ, 400 Hz tone, 100% 300 400 520 mVrms

O

= 100 dBµ, 400 Hz tone, 100%,

V

IN

single tuning coil

= 100 dBµ, 400 Hz tone, 100% 79 85 dB

IN

(lim) 400 Hz tone, 100%, soft mute ON 34 40 46 dBµ

= 100 dBµ, V19% 0.3 V 140 190 280 kHz

IN

V

= 100 dBµ, V16=2V,

IN

400 Hz tone, 100%

= 100 dBµ, V16=4V,

V

IN

400 Hz tone, 100%
VIN= 0 dBµ, R16=10kΩ, pin 17 0 0.1 0.4 V
VIN= 50 dBµ, R16=10kΩ, pin 17 1.4 2.3 3.2 V
VIN= 70 dBµ, R16=10kΩ, pin 17 2.5 4.5 5.5 V
VIN= 100 dBµ, R16=10kΩ, pin 17 5.0 5.5 6.0 V
VIN= 0 dBµ, pin 16 4.0 4.8 5.5 V
VIN= 100 dBµ, pin 16 0 0 0.3 V

= 100 dBµ, 1 kHz tone, 30% AM 57 70 dB

IN

= 0 dBµ, pin 8 to 12 –0.25 0 +0.25 V

V

IN

VIN= 0 dBµ, pin 9 to 12 –0.5 0 +0.5 V
Pin 19 50 58 66 dBµ

8V

0.3 0.8 %

10 15 20 dB

25 29 33 dB

Allowable power dissipation, Pd max – mW

Pdmax–Ta Pdmax–Ta

Ambient temperature, Ta – °C

Allowable power dissipation, Pd max – mW

Mounted on PCB
(90 × 60 × 1.5 mm3glass epoxy

Independent
IC

Ambient temperature, Ta – °C

No. 2725-3/17

LA1145, 1145M

LA1145 Equivalent Circuit Block Diagram

S-meter detector

IF amp

IF amp

IF amp

LA1145M Equivalent Circuit Block Diagram

S-meter Mute

Quadrature
detector

driver

Voltage
regulator

IF
count

Hole
detector/
mute
driver

Unit (resistance: Ω, capacitance: F)

S-meter
detector

Hole
detector/
mute
driver

Start point Gradient

Voltage
regulator

IF
count

*R

is a resistor for variable gain.

CT

Normally 0 Ω.

No. 2725-4/17

Sample Application Circuit

LA1145, 1145M

50 µs
DC
emphasis
capacitor

Mute driver
output

S-meter
output

Unit (resistance: Ω, capacitance: F)

LS1140 and LS1145 Compared

Parameter LA1140 LA1145 Remarks
Package SIP-16
IF amp, limiter Direct-coupled C-coupled

Quadrature detector jj
AF preamp jj
AFC output jj
Signal meter output j

Band muting j
IF count buffer output – j Common with STRQ
SD circuit – j
S/N 78 dBµ 86 dB
3 dBµ limiting sensitivity 25 dBµ (fixed) 25 to 40 dBµ
Weak signal noise output j

SIP-18Z
MFP-20

j Improved linearity, variable S-meter gradient

C

j

C

j

C

Improved temperature stability,
V

dependent

BE

For the LA1140, Coupled with the soft muting
function.

–3 dBµ limiting sensitivity variable,
independent of soft muting function

L1: 81N-014A (Sumida)
L2: 81N-014B (Sumida)

No. 2725-5/17

LA1145, 1145M

LA1145 Pin Description and Typical Voltages

Pin No. Typical Voltage (V) Description Remarks

1 2.6 IF input
2 2.6 IF amp bias
3 0.0 IF amp GND
4 4.0 Mute start control
5 0.2 Mute gradient control
6 2.1 Mute attenuation control
7 4.9 AF output
8 5.0 AFC output

9 4.8 IF output
10 4.8 Quadrature detection input
11 4.8 Voltage regulator output
12 8.0 V
13 0.1 IF count output, control
14 0.0 GND for detection circuit
15 4.8 Mute driver
16 0.2 S-meter output
17 0.2 SD sensitivity control
18 0.1 SD output Open collector

CC

LA1145M Pin Description and Typical Voltages

Pin No. Typical Voltage (V) Description Remarks

1–NC

2 2.6 IF input

3 2.6 IF amp bias

4 0.0 IF amp GND

5 4.0 Mute start control

6 0.2 Mute gradient control

7 2.1 Mute attenuation control

8 4.9 AF output

9 5.0 AFC output
10 4.8 IF output
11 4.8 Quadrature detection input
12 4.8 Voltage regulator output
13 8.0 V
14 0.1 IF count output, control
15 0.0 GND for detection circuit
16 4.8 Mute driver
17 0.2 S-meter output
18 0.2 SD sensitivity control
19 0.1 SD output Open collector
20 – NC

CC

No. 2725-6/17