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