Maker : ATMEL Corporation
Part No. : U209B

  Datasheet PDF : U209B.pdf
  Cross Reference : U209B Cross Reference
  Buy Component : U209B Find Stock and Price

Shortcut : U2090B  U209B  U209B3  U209B3-FP 

Product Information

U4090B Monolithic Integrated Feature Phone Circuit Description The µc controlled telephone circuit U4090B is a linear integrated circuit for use in feature phones, answering machines and fax machines. It contains the speech circuit, tone ringer interface with dc/dc converter, sidetone equivalent and ear protection rectifiers. The circuit is line powered and contains all components necessary for amplification of signals and adaptation to the line. An integrated voice switch with loudspeaker amplifier allows loudhearing or handsfree operation. With an anti-feedback function, acoustical feedback during loudhearing can be reduced significantly. The generated supply voltage is suitable for a wide range of peripheral circuits. Features D D D D D D D D D D D D D D D DC characteristic adjustable Transmit and receive gain adjustable Symmetrical input of microphone amplifier Anti-clipping in transmit direction Automatic line loss compensation Symmetrical output of earpiece amplifier Built-in ear protection DTMF and MUTE input Adjustable sidetone suppression independent of sending and receiving amplification Speech circuit with two sidetone networks Built-in line detection circuit Integrated amplifier for loudhearing operation Anti-clipping for loudspeaker amplifier Improved acoustical feedback suppression Power down D Voice switch D Tone ringer interface with dc/dc converter D Zero crossing detection D Common speaker for loudhearing and tone ringer D Supply voltages for all functional blocks of a subscriber set D Integrated transistor for short circuiting the line voltage D Answering machine interface D Operation possible from 10 mA line currents Benefits D Savings of one piezo electric transducer D Complete system integration of analog signal processing on one chip D Very few external components Applications Feature phone, answering machine, fax machine, speaker phone Speech circuit Voice switch Audio amplifier Loudhearing and Tone ringing MC with EEPROM/ DTMF 94 8741 Tone ringer TELEFUNKEN Semiconductors Rev. C1, 28-Oct-96 1 (34) Preliminary Information U4090B Block Diagram 2 (34) GT MICO TXIN IMPSEL 21 31 7 1 3 600 W 34 TXA 900 W Power supply Impedance control VL I L I Supply Line detect AGA control Q S Current supply TX ACL V M 9 GND 6 PD 32 I REF 20 17 LIDET V RING 16 Receive attenuation RA2 –1 Mute receive control RA1 – + ST BAL – + – + 25 MUTX MUTR 35 36 40 41 39 38 RECO2 RECO1 GR RAC 37 STIL STIS 43 RECIN VMP + – 19 RFDO 18 THA 15 C OSC SW OUT 44 33 STO VL 8 AGA IND SENSE V B 11 10 V MP 14 V MPS 13 Transmit mute control 94 8064 MIC1 5 MIC MIC2 4 DTMF DTMF 2 TTXA 42 INLDR 28 Figure 1. INLDT 27 TLDR 30 TLDT 29 26 Acoustical feedback suppression control ATAFS 12 Preliminary Information SAO SA 22 SACL TSACL 24 SAI SAI 23 TELEFUNKEN Semiconductors Rev. C1, 28-Oct-96 GSA Tip hook switch C1 13 V R2 to STIN to m C 1 3 7 C8 VM 34 21 31 10 11 14 13 5 4 2 42 R6 28 27 16 15 Q1 C9 20 17 44 33 8 Ring R3 V M C2 C4 C5 C6 R4 C3 R1 C7 R28 TELEFUNKEN Semiconductors Rev. C1, 28-Oct-96 9 6 32 R5 Micro– phone DTMF Generator R27 C22 C21 RECO C20 R20 MICO R19 U4090B C19 Loudspeaker 12 22 24 23 25 35 40 R11 R13 R12 V M Earpeace C12 V M R9 41 39 C13 R10 R8 C11 36 C18 30 C17 29 R31 26 L1 19 R7 18 38 37 43 C10 STIN 2 (Option) Figure 2. Application circuit for loudhearing C16 Preliminary Information V L STO V M C15 R17 C14 R16 R15 R14 Micro controller VMP U4090B 94 8849 3 (34) U4090B 4 (34) hook switch C2 R26 to STIN 1 3 33 8 34 VM 4 C21 42 R6 28 C18 30 C17 29 R18 12 22 C15 24 C14 R15 R14 R13 R12 R11 23 25 35 36 41 39 C13 R 10 STIN 2 (Option) Earpiece VM C12 VM R9 R8 C11 BC177 STN 40 38 37 43 C10 VB VL LOGTX R21 VMP 18 C16 26 19 R7 27 16 15 Q1 C9 20 17 2 9 6 32 21 31 7 10 44 11 14 13 5 to m C C8 Ring Micro– phone R1 13 V R4 VM C3 R2 Tip C7 R25 R3 DTMF R24 C25 C1 C4 C6 C5 C23 HF–Mic C24 R23 R22 R5 RECO C27 R30 R29 LOGTX U4090B C26 L1 ...

Link URL