U3900BM

· Speech circuit with anti-clipping
·Tone ringer interface with DC/DC converter
· Speaker amplifier with anti-distortion
· Power-supply management, regulated, unregulated and a special supply for electret microphone
·Voice switch
·CLID + SCWID
·DTMF generator
·Switch matrix
·Line current information
·Fully programmable
·Watchdog

The U3900BM is designed as one kind of programmable telephone audio processor that can be used in feature phone, answering machine, fax machine, speaker phone, base station of cordless phone. This device can also be supplied via an external power supply. The benefits of U3900BM are:(1)savings of one piezoelectric transducer; (2)complete system integration of analog signal processing on one chip; (3)very few external components; (4)highly integrated solution; (5)extremely versatile due to full programmability.

The features of the U3900BM are:(1)speech circuit with anti-clipping; (2)tone ringer interface with DC/DC converter; (3)speaker amplifier with anti-distortion; (4)power-supply management, regulated, unregulated and a special supply for electret microphone; (5)voice switch; (6)CLID + SCWID; (7)DTMF generator; (8)switch matrix; (9)line current information; (10)fully programmable; (11)watchdog.

The absolute maximum ratings of the U3900BM can be summarized as:(1)line current: 140 mA;(2)DC line voltage: 12 V;(3)maximum input current: 15 mA;(4)junction temperature: 125 ;(5)ambient temperature: -25 to +75 ;(6)storage temperature: -55 to +150 ;(7)total power dissipation: 0.9 W. If you want to know more information such as the electrical characteristics about U3900BM, please download the datasheet in www.seekic.com or www.chinaicmart.com .