LA1145M

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 = 70°C 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 = 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) 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 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 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 dBµ dBµ kHz dB dB V V V V V dB dB V V dBµ 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 = 70°C, mounted on PC board, independent IC Ta = 25°C, 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 = 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 = 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 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 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 dBµ dBµ kHz dB dB V V V V V V dB V V dBµ 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 × 60 × 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: Ω, 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 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 Quadrature detector AF preamp AFC output Signal meter output Band muting IF count buffer output SD circuit S/N 3 dBµ limiting sensitivity Weak signal noise output LA1140 SIP-16 Direct-coupled j j j j j – – 78 dBµ 25 dBµ (fixed) j LA1145 SIP-18Z MFP-20 C-coupled j j j j C j C j j 86 dB 25 to 40 dBµ j C –3 dBµ 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, τ = RAFC × 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 – dBµ Band Mute Characteristics (2) Without C17 With C17 = 10000 pF Frequency, ∆f – kHz Frequency, ∆f – kHz No. 2725-10/17 ANT input level – dBµ 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 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. 2. Mute drive voltage V15 (Mute attenuation) Hole detector S-meter (Adjust R4, R5) ANT input level (dBµ) 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 Ω) Total harmonic distortion, THD – dB Demodulation level – dBm/600 Ω S-Meter output voltage – V Mute driver voltage, V15 – V Mute Driver Voltage Characteristics IF input level, – dBµ I/O Characteristics (Mute Start Point) Demodulation level – dBm/600 Ω Maximum sensitivity, VS – V Demodulation level – dBm/600 Ω IF input level – dBµ I/O Characteristics (Mute Gradient) ANT input level – dBµ ANT input level – dBµ No. 2725-11/17 LA1145, 1145M I/O Characteristics (Mute Attenuation Level) Demodulation level – dBm/600 Ω I/O Characteristics Demodulation level – dB Mute driver voltage (V15) ANT input level – dBµ SD Sensitivity Temperature Characteristics –3 dB limiting sensitivity – dBµ Ambient temperature, Ta – °C SD Sensitivity Characteristics (IF input) SD sensitivity (IF input level) – dBµ ANT input level – dBµ –3 dB Limiting Sensitivity Temperature Characteristics SD Sensitivity – dBµ Ambient temperature, Ta – °C SD Sensitivity Characteristics (ANT input) SD ON level – dBµ (S-meter load resistor) SD sensitivity resistor value – Ω I/O Characteristics Total harmonic distortion, THD – dB Demodulation level – dBm/600 Ω 17RSD-Adj resistor – Ω S-Meter Characteristics (RCT = 0 Ω) IF input level – dBµ Output voltage – V IF input level – dBµ No. 2725-12/17 LA1145, 1145M Mute Driver Voltage Mute driver voltage, V15 – V Mute Driver Voltage Output voltage, V15 – V IF input level – dBµ Resistor-Dependent Mute Attenuation S-level change IF input level – dBµ Load Resistance-Dependent Band Muting Attenuation Mute driver voltage = 4 V Muting range – kHz Attenuation – dB Attenuation setting resistor value – Ω AFC Characteristics IF count output level – dBµ Load resistance – Ω IF Count Output Characteristics ∆VAFC – V Frequency, ∆f – kHz Current Drain Characteristics Muting IF input level – dBµ Power Supply-Dependent S-Meter Output Voltage S-Meter output voltage, V16 – V Current drain, ICC – mA IF input level – dBµ 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 – dBµ 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 Ω) Current drain, ICC – mA Supply voltage, VCC – V I/O Characteristics (RCT = 0 Ω) Demodulation output – dBm/600 Ω Demodulation level shift – dB Demodulation level shift – dB Ambient temperature, Ta – °C I/O Characteristics (RCT = 100 Ω) Pin 15 short IF input level – dBµ I/O Characteristics (RCT = 100 Ω) Ambient temperature, Ta – °C I/O Characteristics (RCT = 510 Ω) Demodulation level shift – dB Pin 15 short IF input level – dBµ I/O Characteristics (RCT = 510 Ω) Ambient temperature, Ta – °C S-Meter Characteristics (Temperature Characteristic) S-Meter output voltage – V Pin 15 short IF input level – dBµ IF input level – dBµ No. 2725-15/17 Demodulation output – dBm/600 Ω Demodulation output – dBm/600 Ω LA1145, 1145M –3 dB Limiting Sensitivity Temperature Characteristics –3 dB limiting sensitivity – dBµ 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 – dBµ Ambient temperature, Ta – °C THD Characteristic (Single Tuning Circuit) ∆VAFC = 0 V IF input level – dBµ THD Detuning Characteristics Total harmonic distortion, THD – dB 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