I2S/TDM Serial Audio Interface with Asynchronous Sample Rate Conversion

Overview

The IPB-I2S-TDM-ASRC combines an I²S/TDM configurable serial audio interface with two embedded stereo Asynchronous Sample Rate Converters (ASRCs).

The ASRCs can provide very high quality in terms of harmonic distortion and noise, tolerance and rejection of input jitter. When sample rate conversion is not necessary, the ASRCs can be bypassed.

The I²S/TDM supports the well-known stereo formats: I²S, Left-Justified or Right-Justified and many configurable TDM formats up to 256 channels.

The backend interface is supplied with a choice of AMBA-AHB, AMBA-APB or a parallel interface.

Key Features

ASRC FEATURES:

2-channel audio sample rate converter
Sample size: up to 24 bits
Lower than -130 dB THD+N for common conversion ratios
Fast synchronization time: 128 input samples
Latency: 64/FSin + 2/FSout
Automatically adjusts to changes in both input and output sample rates
High input jitter tolerance
Input/output sample rate range: 8 kHz to 192 kHz
Sampling rate conversion ratios: 3.9 : 1 : 7
Features customized upon request

I2S/TDM FEATURES:

Runtime configurable serial audio formats: I2S, left-justified, right-justified or TDM
Supports all commonly used sample rates including (but not limited) 8, 11.025, 16, 22.05, 32, 44.1, 48, 96, and 192 kHz
Audio sample sizes: 8, 16, 24 or 32 bits
Supports slave or master modes
Supports up to 256 audio channels

Benefits

Integrating this unique component will eliminate a discrete component in the bill of materials
Support for both FPGA and ASIC with seamless transition
Configurable architecture allows features to be changed upon request

Block Diagram

Deliverables

Verilog source code or FPGA netlist
Verilog testbench for RTL simulation
Synthesis constraints
Datasheet

Technical Specifications

Foundry, Node

All

Maturity

Silicon and FPGA proven

Availability

Now

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