IP cuts audio codec silicon area by 40% for wireless device SoCs

June 29, 2015 // By Graham Prophet
Dolphin Integration’s sCODa-MT1-LR.01 is a stereo audio CODEC supporting both analogue and digital microphones. This audio IP virtual component is intended for SoCs targeting wireless audio devices, such as Bluetooth speakers or sound bars, where sound performance and die cost are key.

This product leverages the high density of a pure logic PMW modulator (40% area reduction at 65 nm compared to a mixed-signal CODEC) with the advantage of the high dynamic range of a mixed-signal ADC. Its ultra-low silicon area, close to one square millimeter, contributes to positioning the sCODa-MT1-LR.01 as the leading converter for cost-effectiveness, Dolphin believes.

sCODa-MT1-LR.01 features:

- One ADC channel with analogue microphone circuitry

- One digital microphone input channel

- Automatic Gain Control (AGC) preventing audio signal saturation on the microphone input

- Wind noise filters to reduce environment disturbances and to enhance voice quality

- PLL-less feature protecting audio signals against any performance drop due to jittered clock issues

- Two DAC channels (R/L) with Pulse Width Modulation (PWM) for speaker or headphone outputs

This product is delivered with a handbook of reference application schematics helping to select external components for a large range of output types (e.g. headphone, speaker, line-out) and performances. This provides guidelines for helping users optimise the cost/performance trade-offs with confidence in well-proven results.

The IP realises;

- Low silicon area using a pure logic PWM DAC

- High SNR, up to 105 dB A-weighted on the DAC (depending on the sound amplifier); 90 dB A-weighted on ADC

- THD of -90 dB on DAC, and -80 dB on ADC

- Wide sampling frequency range: 8 kHz to 192 kHz

The product is available at 65 nm at TSMC, but is easily retargetable from 130 nm to 28 nm at leading foundry processes.

Dolphin Integration; www.dolphin-ip.com