ad1989a Conexant Systems, Inc., ad1989a Datasheet - Page 20

• Manufacturer Part Number: ad1989a
• Description: Ad1989a High Definition Audio Soundmax Codec
• Manufacturer: Conexant Systems, Inc.

High Definition Audio SoundMAX Codec
1.7
Table 11.
Figure 2.
Figure 3.
20
t
t
t
t
t
t
t
0
0
0
1
2
3
4
DM_DATA
DM_CLK
Microphone Timing Parameters
Uniplex Microphone Timing
Multiplex Microphone Timing
DM_CLK (1.5 MHz) Period
DM_CLK (2.0 MHz) Period
DM_CLK (3.0 MHz) Period
DM_CLK Rise Time
DM_CLK Fall Time
Data Setup to DM_CLK Edge
Data Hold from DM_CLK Edge
DM_DATA
Digital Microphone Interface Timing Specifications
DM_CLK
Parameter
The digital microphone interface can support one or two digital microphones using two
or three codec pins. Both uniplex (one microphone per data pin) and multiplex (two
microphones sharing the same data pin) are supported. The timing for these
configurations is shown in
clock at 1.5 MHz, 2.0 MHz, or 3.0 MHz to suit quality and power requirements
Duty Cycle
Duty Cycle
Duty Cycle
LEFT DATA VALID
t
t
3
3
DATA VALID
Timing Requirements
t
0
t
0
Conexant
t
4
Figures 2
100
5
Minimum
t
4
RIGHT DATA VALID
and 3. The interface can generate a microphone
t
3
667
50/50
500
50/50
333
50/50
t
1
t
t
4
1
Typical
t
LEFT DATA VALID
2
5
5
Maximum
t
2
AD1989A Data Sheet
DSH-202088A
ns
%
ns
%
ns
%
ns
ns
ns
ns
Unit
3/2/09