LE58QL021
Codec/Filter SLAC Device
Overview
We are transitioning to Microchip; this page will be directed to Le58QL021 product page at www.microchip.com.
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Microsemi'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). |
Detailed Block Diagram
Features & Benefits
- 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, 6.17, or 8.192 MHz master clock derived from MCLK or PCLK
- Built-in test modes with loopback, tone generation, and 0P 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
