SI3232

Si3232 DUAL PROGRAMMABLE CMOS SLIC WITH LINE MONITORING Features Ideal for customer premise applications Low standby power consumption: <65 mW per channel Internal balanced ringing to 65 Vrms Software programmable parameters: Ringing frequency, amplitude, cadence, and waveshape Two-wire ac impedance DC loop feed (18–45 mA) Loop closure and ring trip thresholds Ground key detect threshold Automatic switching of up to three battery supplies On-hook transmission Loop or ground start operation with smooth/abrupt polarity reversal SPI bus digital interface with programmable interrupts 3.3 V operation GR-909 loop diagnostics and loopback testing 12 kHz/16 kHz pulse metering Lead-free/RoHS compatible packages available Ordering Information See page 122. U.S. Patent #6,567,521 Applications Cable telephony Wireless local loop Voice over IP/voice over DSL ISDN terminal adapters U.S. Patent #6,812,744 Other patents pending Description The Si3232 is a low-voltage CMOS SLIC that offers a low-cost, fully softwareprogrammable, dual-channel, analog telephone interface for customer premise (CPE) applications. Internal ringing generation eliminates centralized ringers and ringing relays, and on-chip subscriber loop testing allows remote line card and loop diagnostics with no external test equipment or relays. The Si3232 performs all programmable SLIC functions in compliance with all relevant LSSGR, ITU, and ETSI specifications; all high-voltage functions are performed by the Si3200 linefee...