DS90UA101-Q1: Maximum Chanel in TDM

Jerry,
you can refer to page24/page25 in UA101 data sheet (www.ti.com/.../ds90ua101-q1.pdf), the TDM format is discussed as below:
TDM Format
There are no well defined rules for TDM format and it can be implemented in large number of ways depending
upon the word length, bit clock, number of channels to be multiplexed, etc. For example, let¡¯s assume that word
clock signal (LRCK) period = 256 * bit clock (BCK) time period. In this case, we can multiplex 4 channels with
maximum word length of 64 bits each, or 8 channels with maximum word length of 32 bits each. Figure 19
illustrates the multiplexing of 8 channels with 24 bit word length, in a format similar to I2S.
Pulse width of LRCK can be used to define a clock period for BCK or to define a slot period, i.e., the period for
which individual channel can be active on the shared data line.
If the number of audio channels is more than 8, DS90UA101-Q1/DS90UA102-Q1 can easily support multiplexed
data with additional devices to multiplex and de-multiplex the data. The number of channels multiplexed on each
data line must be selected as a power of 2, for example, 2/ 4/ 8.


best regards,
Steven