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ST5080A データシート(PDF) 4 Page - STMicroelectronics |
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ST5080A データシート(HTML) 4 Page - STMicroelectronics |
4 / 32 page GENERAL DESCRIPTION ST5080A PIAFE is a combined PCM CODEC/FIL- TER device optimized for ISDN Terminals and Digi- tal Telephone applications. This device is A-law and Mu-law selectable and offers a number of pro- grammable functions accessed through a serial control channel. Depending on mode selected, channel control is provided by means of a separate serial channel control MICROWIRE compatible or multiplexed with the PCM voice data channel in a GCI com- patible format requiring only 4 digital interface pins. When separate serial control interface is se- lected, PCM interface is compatible with Combo I and Combo II families of devices such as ETC5057/54, TS5070/71. PIAFE is built using SGS-THOMSON’s advanced HCMOS process. Transmit section of PIAFE consists of an amplifier with switchable high impedance inputs followed by a programmable gain amplifier, an active RC antialiasing pre-filter to provide attenuationof high frequency noise, an 8th order switched capacitor band pass transmit filter and an A-law/Mu-law se- lectable compandig encoder. Receive section consist of an A-law/Mu-law se- lectable expanding decoder which reconstructs the analog sampled data signal, a 3400 Hz low pass filter with sin X/X correction followed by two separate programmable attenuation blocks and two power amplifiers: One can be used to drive an earpiece, and the other to drive a 50 Ω loud- speaker. Programmable functions on PIAFE include a Ring/Tone generator which provides one or two tones and can be directed to earpiece or to loud- speaker or alternatively a piezo transducer up to 600nF. A separate programmable gain amplifier allows gain control of the signal injected. Ring/Tone gen- erator provides sinewave or squarewave signal with precise frequencies which may be also di- rected to the input of the Transmit amplifier for DTMF tone generation. An auxiliary analog input (EAIN) is also provided to enable for example the output of an external band limited Ring signal to the Loudspeaker. Transmit signal may be fed back into the receive ampifier with a programmable attenuation to pro- vide a sidetone circuitry. A switchable anti-accoustic feed-back system cancels the larsen effect in speech monitoring ap- plication. Two additional pins are provided for insertion of an external Handfree function in the Loudspeaker receive path. An output latch controlled by register program- ming permits external device control. PIN FUNCTIONS Pin Name Description 1,2 HFI, HFO Hands free I/Os: These two pins can be used to insert an external Handfree circuit such as the TEA 7540 in the receive path. HFO is an output which provides the signal issued from output of the receive low pass filter while HFI is a high impendance input which is connected directly to one of the inputs of the Loudspeaker amplifier. 3,4 VFr+,VFr– Receive analog earpiece amplifier complementary outputs, capable of driving load impedances between 100 and 400 Ω or a piezo up to 150nF. These outputs can drive directly earpiece transductor. The signal at this output can drive be the summ of: - Receive Speech signal from DR, - Internal Tone Generator, - Sidetone signal. 5VCC Positive power supply input for the digital section. +5 V + 10%. 6,7 LS-,LS+ Receive analog loudspeaker amplifier complementary outputs, intended for driving a Loudspeaker: 80 mW on 50 Ω load impedance can be provided at low distorsion meeting specifications. Alternatively this stage can drive a piezo transducer up to 600nF. The signal at these outputs can be the sum of: - Receive Speech signal from DR, - Internal Tone generator, - External input signal from EAIN input. ST5080A 4/32 |
同様の部品番号 - ST5080A |
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同様の説明 - ST5080A |
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