U4090B-P Datasheet, PDF (1/35 Pages) ATMEL Corporation – Monolithic Integrated Feature Phone Circuit EMI Improved

Features
• 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 Loud-hearing Operation
• Anti-clipping for Loudspeaker Amplifier
• Improved Acoustical Feedback Suppression
• Power Down
• Voice Switch
• Tone Ringer Interface with DC/DC Converter
• Zero Crossing Detection
• Common Speaker for Loud-hearing and Tone Ringer
• Supply Voltages for all Functional Blocks of a Subscriber Set
• Integrated Transistor for Short-circuiting the Line Voltage
• Answering Machine Interface
• Operation Possible from 10 mA Line Currents
• Filters against EMI on Critical I/O
Applications
• Feature Phone
• Answering Machine
• Fax Machine
• Speaker Phone
Benefits
• Savings of One Piezoelectric Transducer
• Complete System Integration of Analog Signal Processing on One Chip
• Very Few External Components
• Fewer Components for EMI Protection
Monolithic
Integrated
Feature Phone
Circuit EMI
Improved
U4090B-P
Rev. 4741C–CORD–11/05