Digital signal controllers with 16-bit audio DAC

16 April 2008 DSP, Micros & Memory

Microchip has announced six new 28- and 44-pin 16-bit dsPIC digital signal controllers (DSCs) with a dual-channel, 100 KSps, 16-bit audio digital-to-analog conversion (DAC) module for price- or size-conscious embedded system designers who require improved audio performance or wish to add audio playback to existing embedded applications.

These new devices feature direct memory access (DMA) with 2 KBytes of dual-port RAM included in the total of 16 KB of RAM. They are offered with 64 or 128 KB of Flash memory, which can store instructions or data. The DSCs all feature full DSP capability for applications that process, compress or decompress audio data. Most MCU instructions and all DSP instructions execute in a single cycle.

Microchip offers optimised software libraries, so designers can add DSP-enabled features without extensive DSP development. Several industry-standard speech-compression libraries can be downloaded for evaluation and development at no charge, and can be licensed for free or at a low cost for production, depending on the library. These speech libraries include G.711 (64 Kbps), ADPCM G.726A (16 to 40 Kbps) and SPEEX (8 Kbps).

The new DSCs feature a range of peripherals including two analog comparators, a user-selectable 10- or 12-bit ADC and a realtime clock calendar. Serial peripherals include two UARTs, two SPIs, I²C and CAN2.0B. Cyclic redundancy checking (CRC) hardware is also included. A parallel master/slave port (PMP) enables parallel connection to external memory, communication peripherals or displays. The devices also include the highly flexible peripheral pin select (PPS), allowing digital peripherals to be remapped to various pins to achieve layout efficiency or access pin-multiplexed peripherals.

Four of the new devices also offer a CODEC interface supporting the I²S and AC'97 protocols, while two also offer motor control and power conversion peripherals, including a 3-phase PWM, a power factor correction PWM and two quadrature encoder interfaces.

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