CS47L85 datasheet(38/370 Pages) CIRRUS

38 / 370 page

CS47L85

Rev 4.3

DIGITAL AUDIO INTERFACE - TDM MODE

When TDM operation is used on the AIFnTXDAT pins, it is important that two devices do not attempt to drive the AIFnTXDAT

pin simultaneously. To support this requirement, the AIFnTXDAT pins can be configured to be tri-stated when not outputting

data.

The timing of the AIFnTXDAT tri-stating at the start and end of the data transmission is described in Figure 7 below.

BCLK

TXDAT

AIFnTXDAT enable time

AIFnTXDAT disable time

AIFnTXDAT undriven (tri-state)

AIFnTXDAT valid (CODEC output)

AIFnTXDAT valid

AIFnTXDAT undriven (tri-state)

Figure 7 Audio Interface Timing - TDM Mode

Test Conditions

The following timing information is valid across the full range of recommended operating conditions, unless otherwise noted.

PARAMETER

MIN

TYP

MAX

UNIT

TDM Timing - Master Mode

CLOAD (AIFnTXDAT) = 15pF to 25pF. BCLK slew (10% to 90%) = 3.7ns to 5.6ns.

AIFnTXDAT enable time from BCLK falling edge

AIFnTXDAT disable time from BCLK falling edge

TDM Timing - Slave Mode

CLOAD (AIFnTXDAT) = 15pF). BCLK slew (10% to 90%) = 3ns.

AIFnTXDAT enable time from BCLK falling edge

AIFnTXDAT disable time from BCLK falling edge

12.2

TDM Timing - Slave Mode

CLOAD (AIFnTXDAT) = 25pF). BCLK slew (10% to 90%) = 6ns

AIFnTXDAT enable time from BCLK falling edge

AIFnTXDAT disable time from BCLK falling edge

14.2

CS47L85 Datasheet(PDF) 38 Page - Cirrus Logic