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N681389
The N681389 implements a single channel FXS telephone line interface optimized for short loop applications. It integrates SLCC (Subscriber Line Control Circuit) functionality with a programmable CODEC and a DC/DC controller. The SLCC supports internal ringing up to 50Vrms (4 REN) ideal for Customer Premise Equipment (CPE). The CODEC can be configured for μ-law, A-law or 16-bit linear PCM encoding. It also supports a comprehensive set of signaling capabilities required to supervise and control the telephone lines. These include tone generation, ring tones, DTMF detection/ generation as well as FSK generation. An on-chip Pulse Width Modulation (PWM) driver allows control of an inductor based DC/DC converter. Programmable impedance and trans-hybrid balancing allow for worldwide deployment.
Target Applications:
| • | Residential VoIP Gateways / Routers/ IP-PBX | |
| • | Analog Telephone Adapter (ATA) | |
| • | Integrated Access Devices | |
| • | Set Top Boxes | |
Key Features:
| • | Complete BORSCHT functions | |
| • | Internal balanced and unbalanced ringing up to 50 Vrms (4 REN) | |
| • | Integrated Power Management Options | |
| - | Integrated DC/DC controller regulates battery voltage to minimize power dissipation in all operating modes | |
| - | Programmable external battery switching | |
| • | Programmable linefeed characteristics | |
| - | Ringing Frequency, Amplitude, and Cadence | |
| - | Trapezoidal and Sinusoidal waveforms | |
| - | Two wire AC impedance, and trans-hybrid balance | |
| - | Constant Current feed (5mA to 45mA) | |
| - | Ring Trip and Loop Closure Thresholds | |
| - | Ground Key Detection and Ground Start. | |
| - | Ground Fault Detection | |
| • | Programmable signal generation and detection | |
| - | DTMF generation/ detection and Tone generation | |
| - | Frequency Shift Keying (FSK) Enhanced Caller ID generation (Type I and Type II) | |
| • | Loop test and diagnostics support | |
| - | Integrated loopback modes | |
| - | Real-time linefeed monitoring | |
| - | On-chip temperature sensor | |
| - | Line Card Diagnostics Support | |
| • | Digital interfaces | |
| - | PCM: G.711 μ-Law, A-Law and 16-bit linear | |
| - | SPI bus | |
| - | Programmable audio path gains | |
| Line Card Diagnostics Support | ||
| • | On-chip PLL for flexible clocking options including 1.0 MHz and 2.0 MHz BCLK operation | |
| • | Wideband and Narrowband codec | |
| • | Operating Characteristics | |
| - | Digital I/O Voltage range: 1.8V ~ 3.3V | |
| - | Temperature range: -40°C ~ 85°C | |
| • | Package | |
| - | QFN-44 | |
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