Sanyo LA1145M Fm if system (quadrature detector) for car radio Datasheet

Ordering number: EN 2725A
Monolithic Linear IC
LA1145, 1145M
FM IF System (Quadrature Detector) for Car Radio
Package Dimensions
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.
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 at Ta = 25 °C
Parameter
Symbol
Conditions
Ratings
Unit
Maximum supply voltage
VCC max
Pin 12
Maximum supply current
ICC max
Pin 12
45
mA
Allowable power dissipation
Pd max
Ta = 65 °C
630
mW
Ta = 70°C
590
mW
14
V
Operating temperature
Topr
–20 to +70
°C
Storage temperature
Tstg
–40 to +150
°C
Ratings
Unit
Operating Conditions at Ta = 25 °C
Parameter
Symbol
Recommended supply voltage
Operating voltage range
Conditions
VCC
VCC op
8
V
7.5 to 14
V
Operating Characteristics at Ta = 25°C,VCC = 8 V, fin = 10.7 MHz
Parameter
Quiescent current
Current drain
Demodulation output
Total harmonic distortion
Signal-to-noise ratio
Input limiting voltage
Muting sensitivity
Muting bandwidth
Symbol
ICCO
ICC
VO
THD
S/N
VIN (lim)
VIN (mute)
BW(mute)
mute(1)
Muting attenuation
mute(2)
Signal strength indication output
Muting drive output
AM rejection ratio
Offset voltage
SD sensitivity
IF count output level
V16-0
V16-50
V16-70
V16-100
V15-0
V15-100
AMR
V7-11
V8-11
VSD
VIN (IF)
Conditions
0 dBµ
100 dBµ
100 dBµ, 400 Hz tone, 100%
100 dBµ, 400 Hz tone, 100%,
single tuning coil
VIN = 100 dBµ, 400 Hz tone, 100%
400 Hz tone, 100%, soft mute ON
V15 = 2 V
VIN = 100 dBµ, V18 % 0.3 V
VIN = 100 dBµ, V15 = 2 V,
400 Hz tone, 100%
VIN = 100 dBµ, V15 = 4 V,
400Hz tone, 100%
VIN = 0 dBµ, RA = 10 kΩ, pin 16
VIN = 50 dBµ, RA = 10 kΩ, pin 16
VIN = 70 dBµ, RA = 10 kΩ, pin 16
VIN = 100 dBµ, RA = 10 kΩ, pin 16
VIN = 0 dBµ, pin 15
VIN = 100 dBµ, pin 15
VIN = 100 dBµ, 1 kHz tone, 30% AM
VIN = 0 dBµ, pins 7 to 11
VIN = 0 dBµ, pin 8 to 11
Pin 18
VIN = 100 dBµ, pin 13, CL = 10 pF
VIN
VIN
VIN
VIN
=
=
=
=
min
18
20
300
typ
26
29
400
max
Unit
36
mA
36
mA
520 mVrms
0.3
0.8
%
79
34
30
140
85
40
36
190
46
42
280
dB
dBµ
dBµ
kHz
10
15
20
dB
25
29
33
dB
0
1.4
2.5
5.0
4.0
0
57
–0.25
–0.5
50
110
0.1
2.3
4.5
5.5
4.8
0
70
0
0
58
180
0.4
3.2
5.5
6.0
5.5
0.3
V
V
V
V
V
dB
dB
V
V
dBµ
mVrms
+0.25
+0.5
66
280
[LA1145M]
Maximum Ratings at Ta = 25 °C
Parameter
Symbol
Conditions
Ratings
Unit
Maximum supply voltage
VCC max
Pin 13
14
V
Maximum supply current
ICC max
Pin 13
45
mA
Allowable power dissipation
Pd max
Ta = 70°C, mounted on PC board,
independent IC
630
mW
Ta = 25°C, mounted on PC board,
Independent IC
630
mW
Operating temperature
Topr
–20 to +70
°C
Storage temperature
Tstg
–40 to +125
°C
No. 2725-2/17
LA1145, 1145M
Operating Conditions at Ta = 25°C
Parameter
Symbol
Recommended supply voltage
Conditions
Ratings
VCC
Operating voltage range
VCC op
Unit
8
V
7.5 to 14
V
Operating Characteristics at Ta = 25 °C, VCC = 8 V, fin = 10.7 MHz
Total harmonic distortion
Signal-to-noise ratio
Input limiting voltage
Muting sensitivity
Muting bandwidth
Symbol
ICCO
ICC
VO
THD
S/N
VIN (lim)
VIN (mute)
BW (mute)
mute (1)
Muting attenuation
mute (2)
Signal strength
indication output
Muting drive output
AM rejection ratio
Offset voltage
SD sensitivity
Allowable power dissipation, Pd max – mW
IF count output level
V17-0
V17-50
V17-70
V17-100
V16-0
V16-100
AMR
V8-12
V9-12
VSD
VIF-On
VIF-OFF
Conditions
VIN = 0 dBµ
VIN = 100 dBµ
VIN = 100 dBµ, 400 Hz tone, 100%
VIN = 100 dBµ, 400 Hz tone, 100%,
single tuning coil
VIN = 100 dBµ, 400 Hz tone, 100%
400 Hz tone, 100%, soft mute ON
V16 = 2 V
VIN = 100 dBµ, V19 % 0.3 V
VIN = 100 dBµ, V16 = 2 V,
400 Hz tone, 100%
VIN = 100 dBµ, V16 = 4 V,
400 Hz tone, 100%
VIN = 0 dBµ, R16 = 10 kΩ, pin 17
VIN = 50 dBµ, R16 = 10 kΩ, pin 17
VIN = 70 dBµ, R16 = 10 kΩ, pin 17
VIN = 100 dBµ, R16 = 10 kΩ, pin 17
VIN = 0 dBµ, pin 16
VIN = 100 dBµ, pin 16
VIN = 100 dBµ, 1 kHz tone, 30% AM
VIN = 0 dBµ, pin 8 to 12
VIN = 0 dBµ, pin 9 to 12
Pin 19
VIN = 100 dBµ, pin 14, CL = 10 pF
VIN = 100 dBµ, pin 14, CL = 10 pF
Pd max – Ta
Ambient temperature, Ta – °C
Allowable power dissipation, Pd max – mW
Parameter
Quiescent current
Current drain
Demodulation output
min
18
20
300
typ
26
29
400
max
Unit
36
mA
40
mA
520 mVrms
0.3
0.8
%
79
34
30
140
85
40
36
190
46
42
280
dB
dBµ
dBµ
kHz
10
15
20
dB
25
29
33
dB
0
1.4
2.5
5.0
4.0
0
57
–0.25
–0.5
50
110
0.1
2.3
4.5
5.5
4.8
0
70
0
0
58
180
1
0.4
3.2
5.5
6.0
5.5
0.3
V
V
V
V
V
V
dB
V
V
dBµ
mVrms
mVrms
+0.25
+0.5
66
280
3
Pd max – Ta
Mounted on PCB
(90 × 60 × 1.5 mm3 glass epoxy
Independent
IC
Ambient temperature, Ta – °C
No. 2725-3/17
LA1145, 1145M
LA1145 Equivalent Circuit Block Diagram
S-meter detector
Quadrature
detector
IF amp
IF amp
Voltage
regulator
IF
count
IF amp
Hole
detector/
mute
driver
Unit (resistance: Ω, capacitance: F)
LA1145M Equivalent Circuit Block Diagram
S-meter
S-meter
detector
Mute
driver
Hole
detector/
mute
driver
Voltage
regulator
IF
count
* RCT is a resistor for variable gain.
Normally 0 Ω.
Start point Gradient
No. 2725-4/17
LA1145, 1145M
Sample Application Circuit
50 µs
DC
emphasis
capacitor
Mute driver
output
S-meter
output
L1: 81N-014A (Sumida)
L2: 81N-014B (Sumida)
Unit (resistance: Ω, capacitance: F)
LS1140 and LS1145 Compared
Parameter
Package
IF amp, limiter
LA1140
LA1145
SIP-16
SIP-18Z
MFP-20
Remarks
Direct-coupled
C-coupled
Quadrature detector
j
j
AF preamp
j
j
AFC output
j
j
Signal meter output
j
j
C
Improved linearity, variable S-meter gradient
Band muting
j
j
C
Improved temperature stability,
VBE dependent
IF count buffer output
–
j
Common with STRQ
SD circuit
–
j
For the LA1140, Coupled with the soft muting
function.
78 dBµ
86 dB
3 dBµ limiting sensitivity
25 dBµ (fixed)
25 to 40 dBµ
Weak signal noise output
j
j
C
S/N
–3 dBµ limiting sensitivity variable,
independent of soft muting function
No. 2725-5/17
LA1145, 1145M
LA1145 Pin Description and Typical Voltages
Pin No.
Typical Voltage (V)
Description
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
VCC
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
Remarks
Open collector
LA1145M Pin Description and Typical Voltages
Pin No.
Typical Voltage (V)
1
–
Description
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
VCC
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
20
–
Remarks
NC
Open collector
NC
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
IF limiting amp
GND
4
Soft mute start point
control
For setting the soft mute starting point.
5
Soft muting gradient
control pin
Can be used for S-meter output.
For setting the mute gradient from the soft
mute starting point to the noise finishing
point.
6
Mute Att
For setting amount of mute attenuation.
The demodulation level changes when the
external resistance value is varied.
7
FM-AF output
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
10
IF input
IF input via the phase shift circuit. The mute
circuit malfunctions and demodulation output
decreases if the voltage level at this pin
drops below 180 mV.
11
Vref
4.8 V
12
VCC
Supply voltage 7.5 to 14 V
13
IF buffer output
14
GND
FM detection circuit GND
15
Mute driver
Amount of mute attenuation depends on and
is controlled by the voltage at this pin.
16
S-meter output
PNP open collector output
17
SD sensitivity setting
Can be used for S-meter output
18
SD 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
Band mute
output
2)
LA1145
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 RAFC and capacitor C. This time constant, τ = RAFC × C, must be set depending on the
required search time.
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
Without C17
Band Mute Characteristics (2)
ANT input level – dBµ
Band Mute Characteristics (1)
ANT input level – dBµ
3.
With C17 = 10000 pF
Frequency, ∆f – kHz
Frequency, ∆f – kHz
No. 2725-10/17
LA1145, 1145M
Soft Mute Characteristics
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 R16.
The LA1145 differs from the LA1140 in that it works with the internal
soft mute circuit continuously engaged.
3.
Mute drive voltage V15
(Mute attenuation)
1.
Hole detector
S-meter
(Adjust R4, R5)
ANT input level (dBµ)
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.
Mute Driver Voltage Characteristics
S-Meter output voltage – V
Mute driver voltage, V15 – V
Total harmonic distortion, THD – dB
Demodulation level – dBm/600 Ω
I/O Characteristics (RCT = 0 Ω)
IF input level, – dBµ
IF input level – dBµ
I/O Characteristics (Mute Gradient)
Demodulation level – dBm/600 Ω
Maximum sensitivity, VS – V
Demodulation level – dBm/600 Ω
I/O Characteristics (Mute Start Point)
ANT input level – dBµ
ANT input level – dBµ
No. 2725-11/17
LA1145, 1145M
I/O Characteristics
Demodulation level – dB
Demodulation level – dBm/600 Ω
I/O Characteristics (Mute Attenuation Level)
ANT input level – dBµ
SD Sensitivity Temperature Characteristics
SD Sensitivity – dBµ
–3 dB limiting sensitivity – dBµ
ANT input level – dBµ
–3 dB Limiting Sensitivity Temperature Characteristics
(S-meter load resistor)
Ambient temperature, Ta – °C
SD Sensitivity Characteristics (ANT input)
SD ON level – dBµ
Ambient temperature, Ta – °C
SD Sensitivity Characteristics (IF input)
SD sensitivity (IF input level) – dBµ
Mute driver
voltage (V15)
17RSD-Adj resistor – Ω
S-Meter Characteristics (RCT = 0 Ω)
Output voltage – V
Total harmonic distortion, THD – dB
Demodulation level – dBm/600 Ω
SD sensitivity resistor value – Ω
I/O Characteristics
IF input level – dBµ
IF input level – dBµ
No. 2725-12/17
LA1145, 1145M
Mute Driver Voltage
Output voltage, V15 – V
Mute driver voltage, V15 – V
Mute Driver Voltage
IF input level – dBµ
Load Resistance-Dependent Band Muting
IF input level – dBµ
Resistor-Dependent Mute Attenuation
Attenuation
Muting range – kHz
Attenuation – dB
S-level change
Mute driver voltage = 4 V
Load resistance – Ω
IF Count Output Characteristics
∆VAFC – V
IF count output level – dBµ
Attenuation setting resistor value – Ω
AFC Characteristics
IF input level – dBµ
Frequency, ∆f – kHz
Current Drain Characteristics
IF input level – dBµ
S-Meter output voltage, V16 – V
Current drain, ICC – mA
Muting
Power Supply-Dependent S-Meter Output Voltage
Supply voltage, VCC – V
No. 2725-13/17
LA1145, 1145M
Power Supply-Dependent AMR
AMR – dB
Demodulation output – mVrms
Power Supply-Dependent Demodulation Output
Supply voltage, VCC – V
Power Supply-Dependent S/N
Supply voltage, VCC – V
Muting Sensitivity Using Hole Detection Output
S/N – dB
Muting sensitivity – dBµ
At 2V mute driver voltage
Supply voltage, VCC – V
Supply voltage, VCC – V
Power Supply-Dependent Mute Driver Voltage
Attenuation – dB
Mute driver voltage – V
Muting Attenuation Characteristics
Supply voltage, VCC – V
Tuning Point Shift
Tuning drift, ∆f – kHz
Muting bandwidth – kHz
Supply voltage, VCC – V
Power Supply-Dependent Muting Bandwidth
Supply voltage, VCC – V
Supply voltage, VCC – V
No. 2725-14/17
LA1145, 1145M
I/O Characteristic (RCT = 0 Ω)
Demodulation level shift – dB
Current drain, ICC – mA
Current Drain Characteristics
Ambient temperature, Ta – °C
I/O Characteristics (RCT = 100 Ω)
Demodulation level shift – dB
Demodulation output – dBm/600 Ω
Supply voltage, VCC – V
I/O Characteristics (RCT = 0 Ω)
Pin 15 short
Ambient temperature, Ta – °C
I/O Characteristics (RCT = 510 Ω)
Demodulation level shift – dB
Demodulation output – dBm/600 Ω
IF input level – dBµ
I/O Characteristics (RCT = 100 Ω)
Pin 15 short
Ambient temperature, Ta – °C
S-Meter Characteristics (Temperature Characteristic)
S-Meter output voltage – V
Demodulation output – dBm/600 Ω
IF input level – dBµ
I/O Characteristics (RCT = 510 Ω)
Pin 15 short
IF input level – dBµ
IF input level – dBµ
No. 2725-15/17
LA1145, 1145M
Muting Attenuation Characteristics
Muting attenuation – dB
–3 dB limiting sensitivity – dBµ
–3 dB Limiting Sensitivity Temperature Characteristics
Pin 15 short
Ambient temperature, Ta – °C
AMR Temperature Characteristics
AMR – dB
Muting bandwidth – kHz
Ambient temperature, Ta – °C
Muting Bandwidth Temperature Characteristics
Ambient temperature, Ta – °C
THD Characteristic (Single Tuning Circuit)
IF count output level – dBµ
Total harmonic distortion, THD – dB
Ambient temperature, Ta – °C
IF Count Output Level Shift
Total harmonic distortion, THD – dB
IF input level – dBµ
THD Detuning Characteristics
∆VAFC = 0 V
IF input level – dBµ
∆VAFC = 0 V
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
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