STAC9227 Datasheet, PDF (24/237 Pages) Integrated Device Technology – 8-CHANNEL HIGH DEFINITION AUDIO CODEC

STAC9227/9228/9229/9230
8-CHANNEL HIGH DEFINITION AUDIO CODEC
PC AUDIO
3.5.
ADAT^® Output
ADAT^®, or “Lightpipe” is available on all versions of STAC927x family. ADAT^® is a single bit stream
optical digital interface for up to 8 channels of uncompressed 24-bit data. Sample rates up to
192 KHz are supported for 2 channels, up to 96 KHz for 4 channels, or up to 48 KHz for 8 channels.
3.6.
Digital Microphone Support
The digital microphone interface permits connection of a digital microphone(s) to the STAC927x fam-
ily via the DMIC0, DMIC1, and DMIC_CLK 3-pin interface. The DMIC0 and DMIC1 signals are inputs
that carry individual channels of digital microphone data to the STAC927x family. In the event that a
single microphone is used, the data is routed to both ADC channels.
The DMIC_CLK output is programmable from 1.176 MHz to 4.704 MHz in 1.176 MHz increments,
and is synchronous to the 24 MHz internal clock. The default frequency is 2.352 MHz.
The STAC927x family supports the following digital microphone configurations:
Table 2. Valid Digital Microphone Configurations
Digital Mics Date Sample ADC Conn.
Notes
0
N/A
N/A No Digital Microphones
Available on either DMIC_0 or DMIC_1
1
Single Edge
0, 1, or 2
Both ADC Channels produce data, may be in phase or out by 1/2
DMIC_CLK period depending upon external configuration and
timing
2
Double Edge
on either
DMIC_0 or 1
OR
Single Edge
on DMIC_0
and 1
0, 1, or 2
Available on either DMIC_0 or DMIC_1, External logic required to
support sampling on a single Digital Mic pin channel on rising
edge and second Digital Mic right channel on falling edge of
DMIC_CLK for those digital microphones that don’t support
alternative clock edge capability. If both DMIC_0 and DMIC_1 are
used to support 2 digital microphones, 2 separate ADC units will
be used, however, this configuration is not recommended since it
consumes two stereo ADC resources.
Double Edge
Requires both DMIC_0 or DMIC_1, External logic required to
on one DMIC
support sampling on a single Digital Mic pin channel on rising
3
pin and Single
Edge on the
0, 1, or 2
edge and second Digital Mic right channel on falling edge of
DMIC_CLK for those digital microphones that don’t support
second DMIC
alternative clock edge capability. Two ADC units are required to
pin.
support this configuration
Connected to DMIC_0 and DMIC_1, External logic required to
support sampling on a single Digital Mic pin channel on rising
4
Double Edge
0, 1, or 2
edge and second Digital Mic right channel on falling edge of
DMIC_CLK for those digital microphones that don’t support
alternative clock edge capability. Two ADC units are required to
support this configuration
IDT™ 8-CHANNEL HIGH DEFINITION AUDIO CODEC
24
IDT CONFIDENTIAL
STAC9227/9228/9229/9230V 1.0 MARCH 2007