Datasheet LA1145M, LA1145 Datasheet (SANYO)

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

LA1145, 1145M

LA1145 Pin Functions (1)

Pin No. Function Internal Equivalent Circuit Notes

1 IF input

2 Bias pin

3 GND

4

5

6 Mute Att

7 FM-AF output

Soft mute start point
control

Soft muting gradient
control pin

IF limiting amp
GND

For setting the soft mute starting point.

Can be used for S-meter output.
For setting the mute gradient from the soft
mute starting point to the noise finishing
point.

For setting amount of mute attenuation.
The demodulation level changes when the
external resistance value is varied.

8 AFC input

9 IF output Output to the phase circuit

No. 2725-7/17

LA1145, 1145M

LA1145 Pin Functions (2)

Pin No. Function Internal Equivalent Circuit Notes

IF input via the phase shift circuit. The mute

10 IF input

circuit malfunctions and demodulation output
decreases if the voltage level at this pin
drops below 180 mV.

11 Vref

12 V

13 IF buffer output

14 GND FM detection circuit GND

15 Mute driver

CC

4.8 V

Supply voltage 7.5 to 14 V

Amount of mute attenuation depends on and
is controlled by the voltage at this pin.

16 S-meter output

17 SD sensitivity setting

18 SD output

PNP open collector output

Can be used for S-meter output

High active

No. 2725-8/17

LA1145, 1145M

SD Output Circuit

1. LA1145 SD output differs from the LA1140’s pin substitute SD output as shown below. The SD output on the LA1145 does
not operate in conjunction with the soft mute characteristics.

1) LA1140

Hole detector

Mute driver

Signal meter

2) LA1145

Band mute

output

Hole detector

Mute driver

Signal meter

Bandmute

output

Comparator

Exhibit hysteresis

As shown, the SD output is the logical AND of the band mute and S-meter comparator outputs.

2. Signal search using the SD output circuit
2-1 The transition response characteristics of the SD output circuit depends on the time constants of pins 15, 16, 17 and 8.

As the SD output transition response characteristics are determined by the pin with the largest time constant, erroneous
stopping will result when a search time is less than the largest one.

2-2 Band mute range circuit time constant (pin 8)

An equivalent circuit to the band circuit is shown below.

Mute switch circuit

No. 2725-9/17

LA1145, 1145M

1) Current path during detuning

2) Current return path from detuning

The input/output current from pin 8 becomes zero during return.

As can be seen from the above circuit diagrams, the time constant during detuning is determined by the internal PNP
resistance, the NPN collector resistance and the capacitance of the externally- mounted capacitor. This time constant is
determined by the external resistance R
required search time.

and capacitor C. This time constant, τ =R

AFC

× C, must be set depending on the

AFC

3. Narrow-band SD output circuit
An IF count circuit is provided for equipment compatibility for the European marketplace. However, if the band is made
narrow using only the SD circuit, there is a tendency for the number of erroneous stops caused by an undesired signal to
increase. To prevent this, two threshold voltages should be used to control the SD circuit.

SD output

Mute driver pin for the 2nd threshold voltage.

SD sensitivity setting

Band Mute Characteristics (1)

Band Mute Characteristics (2)

ANT input level – dBµ

Without C

17

Frequency, ∆f – kHz

ANT input level – dBµ

With C17= 10000 pF

Frequency, ∆f – kHz

No. 2725-10/17

LA1145, 1145M

Soft Mute Characteristics

1. Control
The S/N setting (C/N) for weak inputs and the –3 dB limiting sensitivity can be controlled by obtaining the proper value for
the un-soft muted input/output signal characteristic. However, usable sensitivity cannot be controlled as this is determined by
the front end and IF design which are unrelated to soft muting.

2. Soft mute setting
Soft mute operation depends on the S-meter circuit voltage and the hole
detection circuit voltage. As shown in the graph on the right, the degree
of soft muting correlates with the mute drive voltage, V15. The control
signal line of the mute drive voltage switches before and after the
10 dBµ ANT divergence point.
When adjusting the soft mute with a weak signal which does not affect
the S-meter, first adjust it using the hole detection input signal. However,
as the S-meter output will readjust the soft mute level, also adjust the
soft mute using the S-meter output. At this point, the hole detection
output adjusts the gain up to the IF input, causing a variance. Also, the
S-meter output is varied by the value of R

.

16

The LA1145 differs from the LA1140 in that it works with the internal
soft mute circuit continuously engaged.

3. Soft mute transition response characteristic
The degree of soft muting automatically varies according to the change in input field strength. Omitting the influence of the
front end wideband AGC circuit, the LA1145’s response speed is dependent on the time constant at pins 15 and 16.

15

(Mute attenuation)

Mute drive voltage V

Hole detector

S-meter
(Adjust R4, R5)

ANT input level (dBµ)

I/O Characteristics (RCT=0Ω)

Mute Driver Voltage Characteristics

–V

15

S-Meter output voltage – V

Mute driver voltage, V

Demodulation level – dBm/600 Ω

Total harmonic distortion, THD – dB

IF input level, – dBµ

I/O Characteristics (Mute Start Point)

–V

S

I/O Characteristics (Mute Gradient)

IF input level – dBµ

Maximum sensitivity, V

Demodulation level – dBm/600 Ω

ANT input level – dBµ

Demodulation level – dBm/600 Ω

ANT input level – dBµ

No. 2725-11/17

LA1145, 1145M

I/O Characteristics (Mute Attenuation Level)

Demodulation level – dBm/600 Ω

ANT input level – dBµ

SD Sensitivity Temperature Characteristics

I/O Characteristics

Mute driver
voltage (V15)

Demodulation level – dB

ANT input level – dBµ

–3 dB Limiting Sensitivity Temperature Characteristics

SD Sensitivity – dBµ

Ambient temperature, Ta – °C

SD Sensitivity Characteristics (IF input)

(S-meter load resistor)

SD sensitivity (IF input level) – dBµ

SD sensitivity resistor value – Ω

I/O Characteristics

–3 dB limiting sensitivity – dBµ

Ambient temperature, Ta – °C

SD Sensitivity Characteristics (ANT input)

SD ON level – dBµ

17RSD-Adj resistor – Ω

S-Meter Characteristics (R

CT

=0Ω)

Output voltage – V

Demodulation level – dBm/600 Ω

Total harmonic distortion, THD – dB

IF input level – dBµ

IF input level – dBµ

No. 2725-12/17

LA1145, 1145M

–V

15

Output voltage, V

Attenuation – dB

Mute Driver Voltage

IF input level – dBµ

Resistor-Dependent Mute Attenuation

S-level change

Attenuation

Mute Driver Voltage

–V

15

Mute driver voltage, V

IF input level – dBµ

Load Resistance-Dependent Band Muting

Muting range – kHz

Mute driver voltage=4V

Attenuation setting resistor value – Ω

–V

AFC

∆V

Current Drain Characteristics

–mA

CC

AFC Characteristics

Frequency, ∆f – kHz

Muting

Load resistance – Ω

IF Count Output Characteristics

IF count output level – dBµ

IF input level – dBµ

Power Supply-Dependent S-Meter Output Voltage

–V

16

Current drain, I

S-Meter output voltage, V

IF input level – dBµ

Supply voltage, VCC–V

No. 2725-13/17

LA1145, 1145M

Power Supply-Dependent Demodulation Output

Demodulation output – mVrms

Supply voltage, VCC–V

Power Supply-Dependent S/N

At 2V mute driver voltage

S/N–dB

Power Supply-Dependent AMR

AMR–dB

Supply voltage, VCC–V

Muting Sensitivity Using Hole Detection Output

Supply voltage, VCC–V

Muting Attenuation Characteristics

Attenuation – dB

Supply voltage, VCC–V

Power Supply-Dependent Muting Bandwidth

Muting sensitivity – dBµ

Supply voltage, VCC–V

Power Supply-Dependent Mute Driver Voltage

Mute driver voltage – V

Supply voltage, VCC–V

Tuning Point Shift

Muting bandwidth – kHz

Supply voltage, VCC–V

Tuning drift, ∆f – kHz

Supply voltage, VCC–V

No. 2725-14/17

LA1145, 1145M

–mA

Current drain, I

CC

Current Drain Characteristics

Supply voltage, VCC–V

I/O Characteristics (RCT=0Ω)

I/O Characteristic (R

CT

=0Ω)

Demodulation level shift – dB

Ambient temperature, Ta – °C

I/O Characteristics (R

= 100 Ω)

CT

Demodulation output – dBm/600 Ω

Demodulation output – dBm/600 Ω

Pin 15 short

IF input level – dBµ

I/O Characteristics (RCT= 100 Ω)

Pin 15 short

IF input level – dBµ

I/O Characteristics (RCT= 510 Ω)

Demodulation level shift – dB

Ambient temperature, Ta – °C

I/O Characteristics (R

= 510 Ω)

CT

Demodulation level shift – dB

Ambient temperature, Ta – °C

S-Meter Characteristics (Temperature Characteristic)

Demodulation output – dBm/600 Ω

Pin 15 short

IF input level – dBµ

S-Meter output voltage – V

IF input level – dBµ

No. 2725-15/17

LA1145, 1145M

–3 dB Limiting Sensitivity Temperature Characteristics

–3 dB limiting sensitivity – dBµ

Pin 15 short

Ambient temperature, Ta – °C

Muting Bandwidth Temperature Characteristics

Muting Attenuation Characteristics

Muting attenuation – dB

Ambient temperature, Ta – °C

AMR Temperature Characteristics

AMR–dB

Muting bandwidth – kHz

IF count output level – dBµ

Ambient temperature, Ta – °C

IF Count Output Level Shift

IF input level – dBµ

THD Detuning Characteristics

Ambient temperature, Ta – °C

THD Characteristic (Single Tuning Circuit)

∆V

=0V

Total harmonic distortion, THD – dB

AFC

IF input level – dBµ

∆V

Total harmonic distortion, THD – dB

AFC

=0V

Detuning frequency – kHz

No. 2725-16/17

LA1145, 1145M

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 defend SANYO ELECTRIC CO., LTD., its affiliates,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. Specifications and information herein are subject to change without notice.

No. 2725-17/17