la3460m Sanyo Semiconductor Corporation, la3460m Datasheet
la3460m
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la3460m Summary of contents
Page 1
... Ordering number : EN4842 Overview The LA3460M is a high performance car stereo tuner IC that includes an FM noise canceller and a stereo multiplex demodulator. Functions [Noise Canceller Block] • Built-in low- and high-pass filters • Noise AGC • Pilot signal compensation function [Multiplex Block] • ...
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... Demodulator output V O S/N ratio S/N Channel balance CB Pilot cancellation PC Gate time tgate Noise sensitivity S N SNC (1) SNC SNC (2) SNC (3) HCC (1) HCC HCC (2) HCC (3) LA3460M Symbol Conditions V max CC I max L Pd max Ta = 85°C Topr Tstg Symbol Conditions Conditions No input MONO ...
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... Phase comparator L.P.F (–) 20 GND 21 PLL input 22 Stereo indicator 23 Composite input 24 Pilot detector lpf Pin Assignment LA3460M Description Noises sensitivity adjustment High cut filter Ceramic resonator Phase comparator low-pass filter Phase comparator low-pass filter PLL input Active low Composite signal input ...
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... Equivalent Circuit Block Diagram Sample Application Circuit LA3460M No. 4842-4/13 ...
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... AGC sensitivity 2 adjustments Monostable multivibrator 3 time constant LA3460M Unit (resistance: Ω, capacitance: F) Internal equivalent circuit Remarks The input impedance is about 50 kΩ. After setting up medium field (about 50 dBµ) reception with the noise sensitivity setting pin (pin 1), set up weak field ( dBµ) reception with the AGC adjustment pin (pin 2) ...
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... Continued from preceding page. Pin Function 4 Memory circuit connection 5 12 Pilot canceller signal input LA3460M Unit (resistance: Ω, capacitance: F) Internal equivalent circuit Remarks Memory circuit used during noise canceller operation The pilot signal level requires adjustment due to variations in the IF output level and other parameters ...
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... N.C 20 MPX GND 10 MPX output (left) 11 MPX output (right) LA3460M Unit (resistance: Ω, capacitance: F) Internal equivalent circuit Remarks Pin 21 is the PLL circuit input. The HCC frequency characteristics are determined by the value of the external capacitor connected to this pin. Noise canceller and MPX circuit ground Continued on next page ...
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... Continued from preceding page. Pin Function 13 Pilot canceller signal input 22 Stereo indicator 16 OSC-stop LA3460M Unit (resistance: Ω, capacitance: F) Internal equivalent circuit Remarks Pin 13 is the pilot canceller signal input. Stereo indicator This is an active-low signal. Continued on next page. No. 4842-8/13 ...
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... Function 14 Separation adjustment 17 VCO 18 Phase comparator 19 LA3460M Unit (resistance: Ω, capacitance: F) Internal equivalent circuit Remarks The trimmer connected at this pin is used to adjust the sub-decoder input level. (The output level in mono (main) mode is not affected.) The oscillator frequency is 456 kHz. Continued on next page. ...
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... Continued from preceding page. Pin Function 9 HCC control input 8 SNC control input 24 Pilot detector LA3460M Unit (resistance: Ω, capacitance: F) Internal equivalent circuit Remarks The sub-output is controlled by an input between 0 and 1 V. The circuit is forced to mono by the insertion MΩ resistor between pin 24 and V . ...
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... The noise exclusion efficiency increases if the gate time is increased. However, distortion due to multipath and overmodulation is increased. 2. MPX Block • HCC (high cut control) frequency characteristics (pin 7) The value of the external capacitor connected to pin 7 determines the output signal frequency characteristics during HCC control. LA3460M No. 4842-11/13 ...
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... When the variable resistor is changed, only the sub-demodulation level is changed, and the mono (main) output level is not changed. The decoder high band separation will not be degraded in the sub-signal frequency band ( kHz) if the value of the external capacitor C is made sufficiently small relative to the impedance of the variable resistor. LA3460M No. 4842-12/13 ...
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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 August, 1998. Specifications and information herein are subject to change without notice. LA3460M PS. No. 4842-13/13 ...