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AM79R251 数据表(PDF) 3 Page - Advanced Micro Devices |
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AM79R251 数据表(HTML) 3 Page - Advanced Micro Devices |
3 / 27 page Am79R251 3 The Am79R251, in combination with an ISLAC ™ device, implements the telephone line interface function. This enables the design of a low cost, high performance, fully software programmable line interface for multiple country applications worldwide. All AC, DC, and signaling parameters are fully programmable via microprocessor or GCI interfaces on the ISLAC device. Additionally, the Am79R251 device has integrated self-test and line-test capabilities to resolve faults to the line or line circuit. The integrated test capability is crucial for remote applications where dedicated test hardware is not cost effective. DISTINCTIVE CHARACTERISTICS OF THE INTELLIGENT ACCESS™ VOICE CHIPSET s Performs all battery feed, ringing, signaling, hybrid and test (BORSCHT) functions s Two chip solution supports high density, multi- channel architecture s Single hardware design meets multiple country requirements through software programming of: — Ringing waveform and frequency — DC loop-feed characteristics and current-limit — Loop-supervision detection thresholds — Off-hook debounce circuit — Ground-key and ring-trip filters — Off-hook detect de-bounce interval — Two-wire AC impedance — Transhybrid balance — Transmit and receive gains — Equalization — Digital I/O pins — A-law/µ-law and linear selection s Supports internal and external battery-backed ringing — Self-contained ringing generation and control — Supports external ringing generator and ring relay — Ring relay operation synchronized to zero crossings of ringing voltage and current — Integrated ring-trip filter and software enabled manual or automatic ring-trip mode s Supports metering generation with envelope shaping s Smooth or abrupt polarity reversal s Adaptive transhybrid balance — Continuous or adapt and freeze s Supports both loop-start and ground-start signaling s Exceeds LSSGR and CCITT central office requirements s Selectable PCM or GCI interface — Supports most available master clock frequencies from 512 kHz to 8.192 MHz s On-hook transmission s Power/service denial mode s Line-feed characteristics independent of battery voltage s Only 5 V, 3.3 V and battery supplies needed s Low idle-power per line s Linear power-feed with intelligent power- management feature s Compatible with inexpensive protection networks; Accommodates low-tolerance fuse resistors while maintaining longitudinal balance s Monitors two-wire interface voltages and currents for subscriber line diagnostics s Built-in voice-path test modes s Power-cross, fault, and foreign voltage detection s Integrated line-test features — Leakage — Line and ringer capacitance — Loop resistance s Integrated self-test features — Echo gain, distortion, and noise s 0 to 70°C commercial operation —–40°C to 85°C extended temperature range available s Small physical size s Up to three relay drivers per ISLIC ™ device — Configurable as test load switches |
类似零件编号 - AM79R251 |
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类似说明 - AM79R251 |
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