U4080B TEMIC Semiconductors, U4080B Datasheet
U4080B
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U4080B Summary of contents
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... Voice-Switched Circuit for Handsfree Operation Description The voice switched speakerphone integrated circuit, U4080B, incorporates a variety of functions (see below). The versality of the device is further enhanced by the Features D Operates on telephone lines, integrated reference voltage regulation D Output power: 100 25- limitation D Chip select pin for active/standby operation Block Diagram / Application Circuit Figure 1 ...
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... U4080B Pin Description Pin Symbol Function 1 R1 Load resistance. Provides reference current for the transmit and receive attenuators. 2 RTG Transmit attenuator nominal gain resistor. Transmit channel gain is inversely proportional to the resistance RTG connected to Pin Transmit attenuator input. Input resistance ...
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... Speaker amplifier ground voltage Pin 14 Volume control input voltage Pin 24 Storage temperature range Junction temperature Ambient temperature range Power dissipation amb Thermal Resistance Parameters Junction ambient TELEFUNKEN Semiconductors Rev. A1, 20-May-96 Preliminary Information U4080B Symbol Value – ...
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... U4080B Electrical Characteristics 7 0.7 V, figure amb Parameters Test Conditions / Pins Supply voltages Supply current 0 1 Regulated output voltage x x Line regulation (deviation) 6 Output resistance Dropout voltage ...
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... Rev. A1, 20-May-96 Preliminary Information Symbol Min. Pins 15 and 2 5 Pin Pin Pins 5 and 7 Pin 25 I 0.8 TH Pin Pins 15 and U4080B Typ. Max. Unit 3.0 3 600 2 4.0 1 (15) ...
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... U4080B Transmit and Receive Attenuators The transmit and receive attenuators are supplementary in function. This means that when one is at maximum gain, the other is at maximum attenuation, and vice versa. That is, both are never on or off. They are controlled by the voltage of ACF (attenuator control filter) at Pin 25 ...
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... RG must be adjusted ( re-establish this value. This change will also increase the receive attenuator’s gain in the transmit mode by a similar amount. The resistor at TLI may also require changing to reset the sensitivity of the transmit level detector. U4080B 1.0 ...
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... U4080B Log Amplifiers (Transmit and Receive Level Detectors) The log amplifiers monitor the levels of the transmit and receive signals tell the I-R comparator which mode is in operation. The input signals are applied to the amplifiers (at TLI and RLI) through coupling capacitors and current limiting resistors. ...
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... When 200 7876 e 600 400 200 [ D V CP1 7876 e U4080B D V CP1 D V CP2 250 100 150 200 MICO rms Figure CP1 D ...
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... U4080B Input Signal MIC Pin 200 2 Slope Pin 11 ) TDO ( Pin 7828 e Microphone Amplifier The microphone amplifier is non-inverting, has an inter- nal gain and a nominal input impedance The output impedance is typically maximum voltage swing available is approximately 2 V ...
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... If the circuit is deselected (see the section on chip select), the V voltage will the integrated circuit, U4080B powered from a regulated supply (not the Tip and Ring lines) of less than 6.5 V, the configuration of figure 14 may be used ensure that V is regulated. The regulated voltage is ...
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... U4080B Switching time The switching times of the speakerphone circuit depend not only on the various external components, but also on the operating condition of the circuit at the same time a change is to take effect. For example, the switching time from idle to transmit is generally quicker than the switching time from receive to transmit (or transmit to receive) ...
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... Application TELEFUNKEN Semiconductors Rev. A1, 20-May-96 Preliminary Information U4080B 13 (15) ...
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... U4080B Dimensions in mm Package: DIP 28 14 (15) Preliminary Information TELEFUNKEN Semiconductors Rev. A1, 20-May-96 ...
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... TEMIC against all claims, costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal damage, injury or death associated with such unintended or TEMIC TELEFUNKEN microelectronic GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany Telephone 7131 67 2831, Fax number 7131 67 2423 TELEFUNKEN Semiconductors Rev. A1, 20-May-96 Preliminary Information unauthorized use. U4080B 15 (15) ...