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Ordering number: EN 2725A
Monolithic Linear IC
LA1145, 1145M FM IF System (Quadrature Detector) for Car Radio
Features
1. 2. On-chip IF count buffer circuit and microprocessorcontrolled switch circuit for ETR. 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. 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]
3.
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 Maximum supply voltage Maximum supply current Allowable power dissipation Operating temperature Storage temperature Symbol VCC max ICC max Pd max Topr Tstg Pin 12 Pin 12 Ta = 65 C Ta = 70C Conditions Ratings 14 45 630 590 -20 to +70 -40 to +150 Unit V mA mW mW C C
Operating Conditions at Ta = 25 C
Parameter Recommended supply voltage Operating voltage range Symbol VCC VCC op Conditions Ratings 8 7.5 to 14 Unit V V
Operating Characteristics at Ta = 25C,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 Muting attenuation mute(2) V16-0 V16-50 V16-70 V16-100 V15-0 V15-100 AMR V7-11 V8-11 VSD VIN (IF) Symbol ICCO ICC VO THD S/N VIN (lim) VIN (mute) BW(mute) mute(1) Conditions 0 dB 100 dB 100 dB, 400 Hz tone, 100% 100 dB, 400 Hz tone, 100%, single tuning coil VIN = 100 dB, 400 Hz tone, 100% 400 Hz tone, 100%, soft mute ON V15 = 2 V VIN = 100 dB, V18 % 0.3 V VIN = 100 dB, V15 = 2 V, 400 Hz tone, 100% VIN = 100 dB, V15 = 4 V, 400Hz tone, 100% VIN = 0 dB, RA = 10 k, pin 16 VIN = 50 dB, RA = 10 k, pin 16 VIN = 70 dB, RA = 10 k, pin 16 VIN = 100 dB, RA = 10 k, pin 16 VIN = 0 dB, pin 15 VIN = 100 dB, pin 15 VIN = 100 dB, 1 kHz tone, 30% AM VIN = 0 dB, pins 7 to 11 VIN = 0 dB, pin 8 to 11 Pin 18 VIN = 100 dB, pin 13, CL = 10 pF VIN VIN VIN VIN = = = = min 18 20 300 typ 26 29 400 0.3 79 34 30 140 10 25 0 1.4 2.5 5.0 4.0 0 57 -0.25 -0.5 50 110 85 40 36 190 15 29 0.1 2.3 4.5 5.5 4.8 0 70 0 0 58 180 max Unit 36 mA 36 mA 520 mVrms 0.8 46 42 280 20 33 0.4 3.2 5.5 6.0 5.5 0.3 +0.25 +0.5 66 280 % dB dB dB kHz dB dB V V V V V dB dB V V dB mVrms
Signal strength indication output
Muting drive output AM rejection ratio Offset voltage SD sensitivity IF count output level
[LA1145M] Maximum Ratings at Ta = 25 C
Parameter Maximum supply voltage Maximum supply current Allowable power dissipation Symbol VCC max ICC max Pd max Pin 13 Pin 13 Ta = 70C, mounted on PC board, independent IC Ta = 25C, mounted on PC board, Independent IC Operating temperature Storage temperature Topr Tstg Conditions Ratings 14 45 630 630 -20 to +70 -40 to +125 Unit V mA mW mW C C
No. 2725-2/17
LA1145, 1145M
Operating Conditions at Ta = 25C
Parameter Recommended supply voltage Operating voltage range Symbol VCC VCC op Conditions Ratings 8 7.5 to 14 Unit V 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 Muting attenuation mute (2) V17-0 V17-50 V17-70 V17-100 V16-0 V16-100 AMR V8-12 V9-12 VSD VIF-On VIF-OFF Symbol ICCO ICC VO THD S/N VIN (lim) VIN (mute) BW (mute) mute (1) Conditions VIN = 0 dB VIN = 100 dB VIN = 100 dB, 400 Hz tone, 100% VIN = 100 dB, 400 Hz tone, 100%, single tuning coil VIN = 100 dB, 400 Hz tone, 100% 400 Hz tone, 100%, soft mute ON V16 = 2 V VIN = 100 dB, V19 % 0.3 V VIN = 100 dB, V16 = 2 V, 400 Hz tone, 100% VIN = 100 dB, V16 = 4 V, 400 Hz tone, 100% VIN = 0 dB, R16 = 10 k, pin 17 VIN = 50 dB, R16 = 10 k, pin 17 VIN = 70 dB, R16 = 10 k, pin 17 VIN = 100 dB, R16 = 10 k, pin 17 VIN = 0 dB, pin 16 VIN = 100 dB, pin 16 VIN = 100 dB, 1 kHz tone, 30% AM VIN = 0 dB, pin 8 to 12 VIN = 0 dB, pin 9 to 12 Pin 19 VIN = 100 dB, pin 14, CL = 10 pF VIN = 100 dB, pin 14, CL = 10 pF min 18 20 300 typ 26 29 400 0.3 79 34 30 140 10 25 0 1.4 2.5 5.0 4.0 0 57 -0.25 -0.5 50 110 85 40 36 190 15 29 0.1 2.3 4.5 5.5 4.8 0 70 0 0 58 180 1 max Unit 36 mA 40 mA 520 mVrms 0.8 46 42 280 20 33 0.4 3.2 5.5 6.0 5.5 0.3 +0.25 +0.5 66 280 3 % dB dB dB kHz dB dB V V V V V V dB V V dB mVrms mVrms
Signal strength indication output
Muting drive output AM rejection ratio Offset voltage SD sensitivity IF count output level
Allowable power dissipation, Pd max - mW
Pd max - Ta
Allowable power dissipation, Pd max - mW
Pd max - Ta
Mounted on PCB (90 x 60 x 1.5 mm3 glass epoxy
Independent IC
Ambient temperature, Ta - C
Ambient temperature, Ta - C
No. 2725-3/17
LA1145, 1145M
LA1145 Equivalent Circuit Block Diagram
S-meter detector Quadrature detector
Voltage regulator
IF amp
IF amp
IF amp
IF count
Hole detector/ mute driver
Unit (resistance: , capacitance: F)
LA1145M Equivalent Circuit Block Diagram
S-meter
Mute driver
S-meter detector
Hole detector/ mute driver
Voltage regulator
IF count
* RCT is a resistor for variable gain. Normally 0 . Start point Gradient
No. 2725-4/17
LA1145, 1145M
Sample Application Circuit
50 s DC emphasis capacitor
Mute driver output
S-meter output
L1: 81N-014A (Sumida) L2: 81N-014B (Sumida) Unit (resistance: , capacitance: F)
LS1140 and LS1145 Compared
Parameter Package IF amp, limiter Quadrature detector AF preamp AFC output Signal meter output Band muting IF count buffer output SD circuit S/N 3 dB limiting sensitivity Weak signal noise output LA1140 SIP-16 Direct-coupled j j j j j - - 78 dB 25 dB (fixed) j LA1145 SIP-18Z MFP-20 C-coupled j j j j C j C j j 86 dB 25 to 40 dB j C -3 dB limiting sensitivity variable, independent of soft muting function Improved linearity, variable S-meter gradient Improved temperature stability, VBE dependent Common with STRQ For the LA1140, Coupled with the soft muting function. Remarks
No. 2725-5/17
LA1145, 1145M
LA1145 Pin Description and Typical Voltages
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Typical Voltage (V) 2.6 2.6 0.0 4.0 0.2 2.1 4.9 5.0 4.8 4.8 4.8 8.0 0.1 0.0 4.8 0.2 0.2 0.1 IF input IF amp bias IF amp GND Mute start control Mute gradient control Mute attenuation control AF output AFC output IF output Quadrature detection input Voltage regulator output VCC IF count output, control GND for detection circuit Mute driver S-meter output SD sensitivity control SD output Open collector Description Remarks
LA1145M Pin Description and Typical Voltages
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Typical Voltage (V) - 2.6 2.6 0.0 4.0 0.2 2.1 4.9 5.0 4.8 4.8 4.8 8.0 0.1 0.0 4.8 0.2 0.2 0.1 - NC IF input IF amp bias IF amp GND Mute start control Mute gradient control Mute attenuation control AF output AFC output IF output Quadrature detection input Voltage regulator output VCC IF count output, control GND for detection circuit Mute driver S-meter output SD sensitivity control SD output NC Open collector Description Remarks
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, = RAFC x C, must be set depending on the required search time. 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)
ANT input level - dB
Band Mute Characteristics (2)
Without C17
With C17 = 10000 pF
Frequency, f - kHz
Frequency, f - kHz No. 2725-10/17
ANT input level - dB
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. 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 dB 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.
2.
Mute drive voltage V15 (Mute attenuation)
Hole detector
S-meter (Adjust R4, R5)
ANT input level (dB)
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.
I/O Characteristics (RCT = 0 ) Total harmonic distortion, THD - dB Demodulation level - dBm/600 S-Meter output voltage - V Mute driver voltage, V15 - V
Mute Driver Voltage Characteristics
IF input level, - dB I/O Characteristics (Mute Start Point) Demodulation level - dBm/600 Maximum sensitivity, VS - V Demodulation level - dBm/600
IF input level - dB I/O Characteristics (Mute Gradient)
ANT input level - dB
ANT input level - dB
No. 2725-11/17
LA1145, 1145M
I/O Characteristics (Mute Attenuation Level) Demodulation level - dBm/600 I/O Characteristics
Demodulation level - dB
Mute driver voltage (V15)
ANT input level - dB SD Sensitivity Temperature Characteristics -3 dB limiting sensitivity - dB Ambient temperature, Ta - C SD Sensitivity Characteristics (IF input) SD sensitivity (IF input level) - dB
ANT input level - dB -3 dB Limiting Sensitivity Temperature Characteristics
SD Sensitivity - dB
Ambient temperature, Ta - C SD Sensitivity Characteristics (ANT input)
SD ON level - dB
(S-meter load resistor)
SD sensitivity resistor value - I/O Characteristics Total harmonic distortion, THD - dB Demodulation level - dBm/600
17RSD-Adj resistor - S-Meter Characteristics (RCT = 0 )
IF input level - dB
Output voltage - V
IF input level - dB No. 2725-12/17
LA1145, 1145M
Mute Driver Voltage Mute driver voltage, V15 - V Mute Driver Voltage
Output voltage, V15 - V
IF input level - dB Resistor-Dependent Mute Attenuation
S-level change
IF input level - dB Load Resistance-Dependent Band Muting
Attenuation
Mute driver voltage = 4 V
Muting range - kHz
Attenuation - dB
Attenuation setting resistor value - AFC Characteristics IF count output level - dB
Load resistance - IF Count Output Characteristics
VAFC - V
Frequency, f - kHz Current Drain Characteristics
Muting
IF input level - dB Power Supply-Dependent S-Meter Output Voltage S-Meter output voltage, V16 - V
Current drain, ICC - mA
IF input level - dB
Supply voltage, VCC - V No. 2725-13/17
LA1145, 1145M
Power Supply-Dependent Demodulation Output Demodulation output - mVrms Power Supply-Dependent AMR
Supply voltage, VCC - V Power Supply-Dependent S/N
AMR - dB Supply voltage, VCC - V Muting Sensitivity Using Hole Detection Output
At 2V mute driver voltage
Supply voltage, VCC - V Muting Attenuation Characteristics
Muting sensitivity - dB Supply voltage, VCC - V Power Supply-Dependent Mute Driver Voltage Supply voltage, VCC - V Power Supply-Dependent Muting Bandwidth Mute driver voltage - V
Attenuation - dB
S/N - dB
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
Current Drain Characteristics I/O Characteristic (RCT = 0 )
Current drain, ICC - mA
Supply voltage, VCC - V I/O Characteristics (RCT = 0 ) Demodulation output - dBm/600 Demodulation level shift - dB
Demodulation level shift - dB
Ambient temperature, Ta - C I/O Characteristics (RCT = 100 )
Pin 15 short IF input level - dB I/O Characteristics (RCT = 100 ) Ambient temperature, Ta - C I/O Characteristics (RCT = 510 ) Demodulation level shift - dB Pin 15 short IF input level - dB I/O Characteristics (RCT = 510 ) Ambient temperature, Ta - C S-Meter Characteristics (Temperature Characteristic) S-Meter output voltage - V Pin 15 short IF input level - dB IF input level - dB No. 2725-15/17
Demodulation output - dBm/600
Demodulation output - dBm/600
LA1145, 1145M
-3 dB Limiting Sensitivity Temperature Characteristics -3 dB limiting sensitivity - dB Muting Attenuation Characteristics
Pin 15 short Ambient temperature, Ta - C Muting Bandwidth Temperature Characteristics Ambient temperature, Ta - C AMR Temperature Characteristics
Muting bandwidth - kHz
AMR - dB
Muting attenuation - dB
Ambient temperature, Ta - C IF Count Output Level Shift Total harmonic distortion, THD - dB IF count output level - dB
Ambient temperature, Ta - C THD Characteristic (Single Tuning Circuit)
VAFC = 0 V
IF input level - dB THD Detuning Characteristics Total harmonic distortion, THD - dB
IF input level - dB
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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