WM7210 Wolfson Microelectronics plc, WM7210 Datasheet - Page 6

• Manufacturer Part Number: WM7210
• Description: Digital Silicon Microphone
• Manufacturer: Wolfson Microelectronics plc

WM7210
AUDIO INTERFACE TIMING
The DAT output is high-impedance when not outputting data; this enables the outputs of two microphones to be connected
together with the data from one microphone interleaved with the data from the other. (The microphones must be configured
to transmit on opposite channels in this case.)
In a typical configuration, the Left channel is transmitted following the rising CLK edge (LRSEL = 0). In this case, the Left
channel should be sampled by the receiving device on the falling CLK edge,
Similarly, the Right channel is typically transmitted following the falling CLK edge (LRSEL = 1). In this case, the Right
channel should be sampled by the receiving device on the rising CLK edge.
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Test Conditions
The following timing information is valid across the full range of recommended operating conditions.
Digital Microphone Interface Timing
CLK cycle time
CLK duty cycle
DAT enable from rising CLK edge (LRSEL = 0)
DAT disable from falling CLK edge (LRSEL = 0)
DAT enable from falling CLK edge (LRSEL = 1)
DAT disable from rising CLK edge (LRSEL = 1)
PARAMETER
Figure 1 Digital Microphone Interface Timing
SYMBOL
t
t
t
t
R_DIS
L_DIS
L_EN
R_EN
t
CY
60:40
MIN
325
TYP
18
18
PTD, Rev 2.0, October 2010
Preliminary Technical Data
MAX
40:60
976
16
16
UNIT
ns
ns
ns
ns
ns
6