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TEA1093T Datasheet(PDF) 6 Page - NXP Semiconductors |
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TEA1093T Datasheet(HTML) 6 Page - NXP Semiconductors |
6 / 28 page 1996 Feb 09 6 Philips Semiconductors Product specification Hands-free IC TEA1093 FUNCTIONAL DESCRIPTION The values given in the functional description are typical values except when otherwise specified. A principle diagram of the TEA106X is shown on the left side of Fig.3. The TEA106X is a transmission circuit of the TEA1060 family intended for hand-set operation. It incorporates a receiving amplifier for the earpiece, a transmit amplifier for the microphone and a hybrid. For more details on the TEA1060 family, please refer to “Data Handbook IC03”. The right side of Fig.3 shows a principle diagram of the TEA1093, a hands-free add-on circuit with a microphone amplifier, a loudspeaker amplifier and a duplex controller. As can be seen from Fig.3, a loop is formed via the sidetone network in the transmission circuit and the acoustic coupling between loudspeaker and microphone of the hands-free circuit. When this loop gain is greater than 1, howling is introduced. In a full duplex application, this would be the case. The loop-gain has to be much lower than 1 and therefore has to be decreased to avoid howling. This is achieved by the duplex controller.The duplex controller of the TEA1093 detects which channel has the ‘largest’ signal and then controls the gain of the microphone amplifier and the loudspeaker amplifier so that the sum of the gains remains constant. As a result, the circuit can be in three stable modes: 1. Transmit mode (Tx mode): the gain of the microphone amplifier is at its maximum and the gain of the loudspeaker amplifier is at its minimum. 2. Receive mode (Rx mode): the gain of the loudspeaker amplifier is at its maximum and the gain of the microphone amplifier is at its minimum. 3. Idle mode: the gain of the amplifiers is halfway between their maximum and minimum value. The difference between the maximum gain and minimum gain is called the switching range. Fig.3 Hands-free telephone set principles. handbook, full pagewidth MGD218 HYBRID DUPLEX CONTROL telephone line acoustic coupling sidetone TEA106X TEA1093 |
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