U4037B-N
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U4037B-NFLG3Y (pdf) |
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U4037B-NFLY |
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• DC Characteristic Adjustable • 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 • Power Down • Tone-ringer Interface • 2-bit D/A for Volume Control • Supply Voltages for All Functional Blocks of a Subscriber Set • Operation Possible from 8-mA Line Currents Microcontrollercontrolled Speech and Ringer Circuit U4037B-N • Telephone Sets • Complete System Integration of Analog Signal Processing on One Chip • Very Few External Components The microcontroller-controlled telephone circuit U4037B-N is a linear integrated circuit for use in telephone sets. It contains the speech circuit, tone-ringer interface, 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. Figure Block Diagram Speech circuit Power supply PWR Microcontroller Tone ringer Pin Configuration Figure Pinning SO24 MICO 1 ST 2 TXACL 3 AGA 4 DTMF 5 VOL1 6 MU/VOL2 7 MEL 8 PD 9 VMP 10 VRING 11 OUT2 12 24 MIC2 23 MIC1 22 RECO2 21 RECO1 20 RIF 19 RECIN 18 VB 17 IMP 16 GND 15 VL 14 IND 13 OUT1 2 U4037B-N U4037B-N Table Pin 1 2 3 4 5 6 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Pin Description Symbol Function MICO Output of microphone preamplifier Sidetone reduction input, input resistance is approximately 25 TXACL Time constant of anti-clipping in transmit path Automatic gain adjustment with line current, a resistor connected from this pin to GND sets the starting point maximum gain change 6 dB DTMF Input for DTMF signals VOL1 2-bit volume adjustment for tone ringer MU/VOL2 1 2-bit volume adjustment for tone ringer 2 Mute of microphone amplifier: - Speech condition, input MU/VOL2 low - DTMF condition input MU/VOL2 high DTMF signal at pin 5 is fed to the line. A part of the DTMF signal is passed to the receiving amplifier as a confidence signal during dialing Input for melody Active high input for reducing the current consumption of the circuit, VL simultaneously is shorted by an internal switch 3.4V regulated supply voltage for peripheral circuits especially microprocessors , minimum output current 2 mA ringing , 4 mA speech mode VRING Input for ringer supply voltage Ordering Information Extended Type Number U4037B-NFLY U4037B-NFLG3Y Package Information Package SO24 Remarks Pb-free Taped and reeled, Pb-free Package SO24 Dimensions in mm technical drawings according to DIN specifications 8 U4037B-N Atmel Corporation 2325 Orchard Parkway San Jose, CA 95131, USA Tel 1 408 441-0311 Fax 1 408 487-2600 Regional Headquarters Europe Atmel Sarl Route des Arsenaux 41 Case Postale 80 CH-1705 Fribourg Switzerland Tel 41 26-426-5555 Fax 41 26-426-5500 Asia Room 1219 Chinachem Golden Plaza 77 Mody Road Tsimshatsui East Kowloon Hong Kong Tel 852 2721-9778 Fax 852 2722-1369 Japan 9F, Tonetsu Shinkawa Bldg. 1-24-8 Shinkawa Chuo-ku, Tokyo 104-0033 Japan Tel 81 3-3523-3551 Fax 81 3-3523-7581 Atmel Operations Memory 2325 Orchard Parkway San Jose, CA 95131, USA Tel 1 408 441-0311 Fax 1 408 436-4314 Microcontrollers 2325 Orchard Parkway San Jose, CA 95131, USA Tel 1 408 441-0311 Fax 1 408 436-4314 La Chantrerie BP 70602 44306 Nantes Cedex 3, France Tel 33 2-40-18-18-18 Fax 33 2-40-18-19-60 ASIC/ASSP/Smart Cards Zone Industrielle 13106 Rousset Cedex, France Tel 33 4-42-53-60-00 Fax 33 4-42-53-60-01 1150 East Cheyenne Mtn. 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