Catalog
Codec/Filter SLAC Device
Key Features
• Low-power, 3.3 V CMOS technology with 5-V tolerant digital inputs
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• Software and coefficient compatible to the Le79Q02/ 021/031 QSLAC device
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• Performs the functions of four codec/filters
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• Software programmable* SLIC device input impedance
• * Transhybrid balance
• * Transmit and receive gains
• * Equalization (frequency response)
• * Digital I/O pins
• * Programmable debouncing on one input
• * Time slot assigner
• * Programmable clock slot and PCM transmit clock edge options
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• Standard microprocessor interface
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• A-law, µ-law, or linear coding
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• Single or Dual PCM ports available* Up to 128 channels (PCLK at 8.192 MHz) per PCM port
• * Optional supervision on the PCM highway
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• 1.536, 1.544, 2.048, 3.072, 3.088, 4.096, 6.144, 6.176, or 8.192 MHz master clock derived from MCLK or PCLK
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• Built-in test modes with loopback, tone generation, and µP access to PCM data
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• Mixed state (analog and digital) impedance scaling
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• Performance guaranteed over a 12 dB gain range
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• Real Time Data register with interrupt (open drain or TTL output)
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• Supports multiplexed SLIC device outputs
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• Broadcast state
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• 256 kHz or 293 kHz chopper clock for SLIC devices with switching regulator
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• Maximum channel bandwidth for V.90 modems
Description
AI
Microchip's cost-effective, software-programmable solution is the Le58QL02/021/031 QLSLAC and the Le58QL061/063 QLSLAC line of DSP-based voice codec/filters. The four-channel QLSLAC devices handle the analog-to-digital and digital-to-analog conversion, filtering, compression and expansion functions required to interface a telephone's analog voice signals to the digital PCM highway or General Circuit Interface (GCI).