la1145 Sanyo Semiconductor Corporation, la1145 Datasheet
la1145
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la1145 Summary of contents
Page 1
... Features 1. On-chip IF count buffer circuit and microprocessor- controlled 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; ...
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... Offset voltage V SD sensitivity IF count output level V [LA1145M] Maximum Ratings °C Parameter Maximum supply voltage Maximum supply current Allowable power dissipation Operating temperature Storage temperature LA1145, 1145M Symbol Conditions V max Pin max Pin max ° 70°C ...
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... Signal strength indication output Muting drive output V AM rejection ratio AMR V Offset voltage V SD sensitivity V IF count output level max – Ta Ambient temperature, Ta – °C LA1145, 1145M Symbol Conditions 10.7 MHz CC in Conditions dBµ CCO 100 dBµ ...
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... LA1145 Equivalent Circuit Block Diagram S-meter detector IF amp IF amp LA1145M Equivalent Circuit Block Diagram LA1145, 1145M Quadrature detector IF amp S-meter Mute driver Hole IF S-meter Voltage detector/ count regulator mute detector driver Start point Gradient Voltage regulator Hole IF detector/ mute count driver ...
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... 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 LA1145, 1145M Mute driver S-meter output output LA1140 LA1145 SIP-18Z SIP-16 MFP-20 Direct-coupled C-coupled j j ...
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... LA1145 Pin Description and Typical Voltages Pin No. Typical Voltage (V) 1 2.6 2 2.6 3 0.0 4 4.0 5 0.2 6 2.1 7 4.9 8 5.0 9 4.8 10 4.8 11 4.8 12 8.0 13 0.1 14 0.0 15 4.8 16 0.2 17 0.2 18 0.1 LA1145M Pin Description and Typical Voltages Pin No. Typical Voltage (V) 1 – 2 2.6 3 2.6 4 0.0 5 4.0 6 0.2 7 2.1 8 4.9 9 5.0 10 4.8 11 4.8 12 4.8 13 8.0 14 0.1 15 0.0 16 4.8 17 0.2 18 0.2 19 0.1 20 – LA1145, 1145M ...
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... LA1145 Pin Functions (1) Pin No. Function 1 IF input 2 Bias pin 3 GND Soft mute start point 4 control Soft muting gradient 5 control pin 6 Mute Att 7 FM-AF output 8 AFC input 9 IF output LA1145, 1145M Internal Equivalent Circuit IF limiting amp GND For setting the soft mute starting point. ...
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... LA1145 Pin Functions (2) Pin No. Function 10 IF input 11 Vref buffer output 14 GND 15 Mute driver 16 S-meter output 17 SD sensitivity setting 18 SD output LA1145, 1145M Internal Equivalent Circuit 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 ...
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... 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 Signal meter Band mute 2) LA1145 Hole detector Signal meter Bandmute As shown, the SD output is the logical AND of the band mute and S-meter comparator outputs. ...
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... To prevent this, two threshold voltages should be used to control the SD circuit. SD sensitivity setting Band Mute Characteristics (1) Without C 17 Frequency, f – kHz LA1145, 1145M The input/output current from pin 8 becomes zero during return. and capacitor C. This time constant, AFC Mute driver pin for the 2nd threshold voltage. Band Mute Characteristics (2) ...
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... 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 (R IF input level, – dBµ ...
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... ANT input level – dBµ SD Sensitivity Temperature Characteristics Ambient temperature, Ta – °C SD Sensitivity Characteristics (IF input) (S-meter load resistor) SD sensitivity resistor value – I/O Characteristics IF input level – dBµ LA1145, 1145M I/O Characteristics Mute driver voltage ( ANT input level – dBµ –3 dB Limiting Sensitivity Temperature Characteristics Ambient temperature, Ta – ...
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... Attenuation setting resistor value – AFC Characteristics Frequency, f – kHz Current Drain Characteristics Muting IF input level – dBµ LA1145, 1145M Mute Driver Voltage IF input level – dBµ Load Resistance-Dependent Band Muting Load resistance – IF Count Output Characteristics IF input level – dBµ ...
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... Muting Attenuation Characteristics Supply voltage, V – Power Supply-Dependent Muting Bandwidth Supply voltage, V – LA1145, 1145M Power Supply-Dependent AMR Supply voltage, V Muting Sensitivity Using Hole Detection Output Supply voltage, V Power Supply-Dependent Mute Driver Voltage Supply voltage, V Tuning Point Shift Supply voltage, V – ...
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... IF input level – dBµ I/O Characteristics (R = 100 CT Pin 15 short IF input level – dBµ I/O Characteristics (R = 510 CT Pin 15 short IF input level – dBµ LA1145, 1145M I/O Characteristic (R Ambient temperature, Ta – °C ) I/O Characteristics (R Ambient temperature, Ta – °C ) I/O Characteristics (R Ambient temperature, Ta – °C ) S-Meter Characteristics (Temperature Characteristic) IF input level – ...
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... Ambient temperature, Ta – °C IF Count Output Level Shift IF input level – dBµ THD Detuning Characteristics AFC Detuning frequency – kHz LA1145, 1145M Muting Attenuation Characteristics Ambient temperature, Ta – °C AMR Temperature Characteristics Ambient temperature, Ta – °C THD Characteristic (Single Tuning Circuit AFC IF input level – ...
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... 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 February, 2002. Specifications and information herein are subject to change without notice. LA1145, 1145M No. 2725-17/17 ...