WM8998 Datasheet, PDF (31/307 Pages) Wolfson Microelectronics plc – High Performance Audio Hub CODEC

Production Data
DIGITAL SPEAKER (PDM) INTERFACE TIMING
SPKCLK
(output)
SPKDAT
(output)
t_CY
(left data)
t_LSU
t_r
t_LH
(right data)
t_RSU
VOH
VOL
t_f
t_RH
VOH
VOL
Figure 3 Digital Speaker (PDM) Interface Timing - Mode A
WM8998
Test Conditions
The following timing information is valid across the full range of recommended operating conditions.
PARAMETER
PDM Audio Interface Timing
SPKCLKn cycle time
SPKCLKn duty cycle
SPKCLKn rise/fall time (25pF load)
SPKDATn set-up time to SPKCLKn rising edge (Left channel)
SPKDATn hold time from SPKCLKn rising edge (Left channel)
SPKDATn set-up time to SPKCLKn falling edge (Right channel)
SPKDATn hold time from SPKCLKn falling edge (Right channel)
SYMBOL
tCY
tr, tf
tLSU
tLH
tRSU
tRH
MIN
160
45
5
30
30
30
30
TYP
163
MAX
358
55
30
UNIT
ns
%
ns
ns
ns
ns
ns
SPKCLK
(output)
t_LEN
SPKDAT
(output)
t_CY
(left data)
t_LDIS
t_r
t_REN
(right data)
VOH
VOL
t_f
VOH
VOL
t_RDIS
Figure 4 Digital Speaker (PDM) Interface Timing - Mode B
Test Conditions
The following timing information is valid across the full range of recommended operating conditions.
PARAMETER
PDM Audio Interface Timing
SPKCLKn cycle time
SPKCLKn duty cycle
SPKCLKn rise/fall time (25pF load)
SPKDATn enable from SPKCLK rising edge (Right channel)
SPKDATn disable to SPKCLK falling edge (Right channel)
SPKDATn enable from SPKCLK falling edge (Left channel)
SPKDATn disable to SPKCLK rising edge (Left channel)
SYMBOL
tCY
tr, tf
tREN
tRDIS
tLEN
tLDIS
MIN
160
45
5
TYP
163
MAX
358
55
30
15
5
15
5
UNIT
ns
%
ns
ns
ns
ns
ns
w
PD, October 2014, Rev 4.0
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