Stereo Audio 24-bit 101dB Sigma-Delta DAC IP Core

3rd Order Stereo Digital Audio Sigma-Delta Modulator IP Core

Overview:

The CWda30 is a 3rd order Stereo Digital Audio Sigma-Delta Modulator. The CWda30 has the Coreworks Audio Parallel Interface (CWAPI) for the input audio data, which permits bridging to other interfaces: I2S, SPDIF, AMBA, PowerPC (CoreConnect ™).

The digital audio data should be presented at the input at the audio sample rate Fs. Each input channel consist of up to 24-bit Pulse Code Modulated (PCM) audio samples.

The master clock signal mclk must be synchronous to the audio sample rate Fs, and a 256X over-sampling rate applies. In order to produce analog signals the core needs an external analog filter and possibly power amplification before connecting to speakers.

The CWda30 features a third order digital sigma-delta modulator (SDM) proceeded by a 32X interpolation filter to produce the bitstreams at the sdm_left and sdm_right outputs. These one-bit signals have a bit rate that equals the mclk frequency, contain the audio data and quantization noise shaped to occupy the high-end of the frequency spectrum.

Functional Description:

Interpolator: Provides 32X over-sampling rate to the input of the Sigma Delta Modulator (SDM). The interpolator is a multi-stage filter which increases the input sample rate gradually. Its purpose is to reduce the noise level at the input of the SDM.

Sigma Delta Modulator: Produces a one-bit output for each of the channels (stereo). Spectrally
shapes the quantization noise to high frequencies, leaving a low noise level in the audio band.

Key Features:

- Fully digital solution
- Sigma Delta Modulated pair of digital outputs (stereo).
- Accepts up to 24-bit sample words at the input.
- 101 dB THD+N
- 101 dB Dynamic Range
- Flexible Coreworks Audio Parallel Interface (CWAPI) at the output, which permits bridging to other standard interfaces (IBM CoreConnect ™, AMBA ™, I2S and SPDIF).
- Low power mode when idle.

Applications:

High quality, low cost, low power digital audio (Headsets, PDAs, Laptops, CD, SACD, DVD-Audio, DVD-Video), and other multimedia systems.

Part Number: CWda30

Price:

How To Purchase

Benefits:

- Fully digital core
- High quality audio (101 dB SNR and dynamic range)
- Low gate count
- Low power

Deliverables:
- Detailed datasheet and user documentation for system integration.
- HDL testbench covering all functionalities of the core and including automatic verification of the correctness of the responses.
- Options: FPGA Netlist, HDL (VHDL or VERILOG) source code, Simulation script, Synthesis and/or place and route scripts, Prototyping boards.

Technology	Resources	Frequency (fclk)
UMC 180 nm	36495 Gates	83 MHz
Xilinx Spartan 2e-6	2816 Slices, 8 BRAMs	25 MHz
Xilinx Spartan 3-4	2071Slices, 4 BRAMs	27 MHz
Xilinx Virtex 2-6	2073 Slices, 4 BRAMs	26 MHz
Xilinx Virtex 2 Pro -5	2071 Slices, 4 BRAMs	28 MHz

Other Digital Audio IP Cores:

IP Name/Part #	Description
CWda01	SPDIF-AES/EBU Feed-Forward Receiver
CWda02	SPDIF-AES/EBU Feed-Forward Transmitter
CWda03	SPDIF-AES/EBU to I2S Converter
CWda04	I2S to SPDIF-AES/EBU Converter
CWda05	SPDIF-AES/EBU Transmitter
CWda06	I2S Transmitter
CWda07	SPDIF-AES/EBU Self-Clocked Receiver
CWda10	I2S Receiver
CWda12	SPDIF to non-PCM Encoded Audio
CWda13	Non-PCM Encoded Audio to SPDIF
CWda14	Configurable SPDIF-AES/EBU Receiver
CWda17	Configurable Digital Audio Serial Output
CWda20	CoreConnect ^TM Audio Input
CWda21	CoreConnect ^TM Audio Output
CWda30	3rd Order Stereo Digital Audio Sigma-Delta Modulator
CWda50	Stereo / Mono Sample Rate Converter
CWda52	Multi-Channel Audio Sample Rate Converter (ASRC)

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