max9867 Maxim Integrated Products, Inc., max9867 Datasheet - Page 42

• Manufacturer Part Number: max9867
• Description: Low-power, Stereo Audio Codec
• Manufacturer: Maxim Integrated Products, Inc.

Ultra-Low Power Stereo Audio Codec
The MAX9867 can accept audio from up to two digital
microphones. When using digital microphones, the left
analog microphone input is retasked as a digital micro-
Table 15. Digital Microphone Input Register
Figure 6. Digital Microphone Timing Diagram
42
Microphone
DIGMICL/DIGMICR
______________________________________________________________________________________
DIGMICDATA
REGISTER
DIGMICCLK
MICCLK
BITS
Digital Microphone Clock
00 = PCLK/8
01 = PCLK/6
10 = Reserved
11 = Reserved
Digital Left/Right Microphone Enable
Note: The left analog microphone input is never available when DIGMICL or DIGMICR = 1.
Digital Microphone Input
LEFT
B7
MICCLK
DIGMICL
t
HD, MIC
0
0
1
1
B6
t
SU, MIC
DIGMICL DIGMICR
1/f
B5
RIGHT
MICCLK
t
HD, MIC
DIGMICR
B4
0
1
0
1
phone input. The right analog microphone input is still
available to allow a combination of analog and digital
microphones to be used. Figure 6 shows the digital
microphone interface timing diagram. See Table 15.
t
SU, MIC
FUNCTION
B3
LEFT
0
microphone unavailable)
Left digital microphone
Left digital microphone
Line input (left analog
ADC input mixer
Left ADC Input
B2
0
B1
RIGHT
0
Right digital microphone
Right digital microphone
Right ADC Input
B0
ADC input mixer
ADC input mixer
0
REGISTER
ADDRESS
0x15