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).

• Low-power, 3.3 V CMOS technology with 5-V tolerant digital inputs
• Software and coefficient compatible to the Le79Q02/ 021/031 QSLAC device
• Performs the functions of four codec/filters
• 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
• Standard microprocessor interface
• A-law, µ-law, or linear coding
• Single or Dual PCM ports available
• Up to 128 channels (PCLK at 8.192 MHz) per PCM port
• Optional supervision on the PCM highway
• 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
• Built-in test modes with loopback, tone generation, and µP access to PCM data
• Mixed state (analog and digital) impedance scaling
• Performance guaranteed over a 12 dB gain range
• Real Time Data register with interrupt (open drain or TTL output)
• Supports multiplexed SLIC device outputs
• Broadcast state
• 256 kHz or 293 kHz chopper clock for SLIC devices with switching regulator
• Maximum channel bandwidth for V.90 modems