Data Sheet

FLC-BTM901 Datasheet
Flaircomm Microelectronics,Inc. - 30-
Mode Description
Class-D
Enables a lower power consumption for the headset.
3-state BD modulation enables a filter-free configuration.
Directly driven from the digital circuitry.
Most of the analog portion is powered-down.
Drives differential headphone loads of 16/32 Ω
Class-AB
Enables either headphone or speaker applications.
Can drive the same headphone outputs instead of switching to Class-D.
Typically, useful for driving high impedance loads such as differential line out,
or analog input
power amp.
Table 5:Headset Output Driver Modes
11.2 Digital Audio Interfaces
Audio digital interfaces include:
■ Digital microphone inputs
■ Standard I²S/PCM interface
■ SPDIF interface
■ Audio MCLK
11.2.1 Digital Microphone Inputs
Up to six channels of digital microphone inputs are supported. These are grouped as
three pairs. Most digital mics can be configured to enable two microphones to share a
single data line. BTM901 supports this mode. It is achieved by one microphone
outputting data on the rising clock edge and the other outputting data on the falling edge
of the clock, while otherwise tri-stating their output.
Four digital mic clock frequencies can be generated, configurable at 500 kHz, 1 MHz, 2
MHz and 4 MHz. The digital mic function can be assigned to PIOs, see Related
Information.
11.2.2 Standard I²S/PCM Interface
BTM901 provides a standard I²S/PCM interface capable of operating at up to a 192 kHz
sample rate. The I²S/PCM port is highly configurable, and has the following options:
■ Master (generate CLK and WS) or Slave (receive CLK and WS)
■ Word Select polarity
■ Left or right justification
■ Sign extension / zero pad
■ Optional 1
‑
bit period delay on WS to start of channel data
■ 13/16/24-bit per sample