miniDSP Ltd, Hong Kong /
/ Features and specifications subject to change without prior notice
12
2.8
A
DDITIONAL
I2S
USAGE NOTES
I2S is not a “plug and play” protocol. It requires attention to technical details such as clocking and wire layout. It
is a solution for OEMs and
advanced
DIYers (or professionals) with suitable knowledge, skills and measurement
equipment. For off-the-shelf completed units with similar capabilities, please see our
other products.
Be sure to take the following precautions when designing your I2S interface and wiring:
General I2S usage notes
•
Unbuffered I2S lines must be kept short to ensure clock and data integrity.
•
If driving longer lines, buffers may be required for the clock signals (MCLK, LRCLK, and BLCK).
•
Observe correct grounding and shielding, and keep analog and digital grounds separated.
•
Ensure that the clock ratios (as listed in Table 4) are compatible with connected circuits.
3.3V logic level
All lines use a 3.3V logic level. Ensure that connected circuits use a compatible level (1.8V, for example, will
not work).
Figure 1. nanoSHARC I2S connections
