U4275B TEMIC Semiconductors, U4275B Datasheet
U4275B
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U4275B Summary of contents
Page 1
... TELEFUNKEN Semiconductors FM-Receiving Condition Analyser and Multipath Noise Cancellation Description The U4275B is a bipolar integrated receiving conditions analyser as well as multipath noise cancellation circuit. Features D Preparation of the fieldstrength signal D Detection of multipath and common channel interferences D Evaluation of the receiving conditions by microcomputer Block diagram ...
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... U4275B Pin description Pin Symbol Function 1 FSIN Fieldstrength input 2 BFSOUT Buffered fieldstrength output 3 AVFS Average of fieldstrength signal 4 MPXIN Multiplex input signal 5 GND2 Analogue ground 6 MPXOUT Multiplex output signal 7 VS Supply voltage 8 VREF Reference voltage 9 INT Interrupt output 10 MUTE External mute input ...
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... The output voltage is limited to max ANAOUT is a multiplex output, i.e. the value for the fieldstrength, level of multipath interference or level of common channel interference is applied to this output depending on addressing. ANAOUT can be switched to the high-impedance state by means of OE. Preliminary Information U4275B ...
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... U4275B INT + INT 94 8654 Certain types of abruptly occuring interference with reception require a fast reaction by the receiver. INT signals such events to other circuit parts by means of m 40- s-wide pulses (low active). The output voltage is limited permit direct activation of a system controller. A monoblend function can thus be activated on simple receivers ...
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... OE. The following assignment applies ADDR1 ADDR0 Rev. A1: 14.03.1995 ADDR1 94 8660 ANAOUT L Internal reference voltage Additional reset of the analog voltages for signal level, multipath, common channel H Signal level L Multipath H Common channel X High impedance off-state Preliminary Information U4275B 8662 5 ...
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... Acoustically relevant multipath interference, since it requires a short reaction time, is suppressed directly by the circuit via a Multipath Noise Cancellation (MNC) function. The U4275B can be used both in conventional receivers and in receivers with digital signal processing. Furthermore designed so that it can activate switchover between antennas on antenna-diversity receivers ...
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... CCFIL, with a long time constant. The capacitor can also be discharged rapidly via corresponding addressment when stations are changed. The common channel detector is blocked for further 20 ms after the detectors are reset to prevent transitory phenomena in the selective filters from causing an indicating error. Preliminary Information U4275B 7 ...
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... U4275B 8 TELEFUNKEN Semiconductors Figure 2 Preliminary Information 94 8663 Rev. A1: 14.03.1995 ...
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... Pin 2 BW 100 Pin Pin 4 V MPXIN W Pin 6 V MPXOUT W Pin 6 = 350 mV W Pin 6 100 W Pin Pin Pin Preliminary Information U4275B Value Unit 10 V t.b.d. mA – t.b.d. C t.b.d. C 2000 V Maximum Unit t.b.d. K/W Typ. Max. Unit 8 5.0 V 5000 mV KHz 5 V 350 ...
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... U4275B Parameters Test conditions / Pins Interrupt output INT R Output voltage low high Reference voltage VREF Output voltage Analog multiplex output Output voltage Oscillator Input voltage Mute Input voltage low high Application circuit 560 k 560 k 150 Oscillator 456 kHz Filter Fieldstrength Buffer ...
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... TELEFUNKEN Semiconductors Extended type number U4275B-AFL U4275B-AFLG3 Dimensions in mm Rev. A1: 14.03.1995 Package SO 20 plastic SO 20 plastic Preliminary Information U4275B Remarks Taping according to IEC-286-3 11 ...
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... U4275B OZONE DEPLETING SUBSTANCES POLICY STATEMENT It is the policy of TEMIC TELEFUNKEN microelectronic GmbH to 1. Meet all present and future national and international statutory requirements and 2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems with respect to their impact on the health and safety of our employees and the public, as well as their impact on the environment ...