AK7754 Datasheet, PDF (19/26 Pages) Asahi Kasei Microsystems – Audio DSP with Stereo CODEC + MIC/HP-AMP

[AK7754]
■ Digital Microphone (DMIC) Switching Characteristics
(Ta= -20˚C ~85˚C; AVDD=HVDD=DVDD=3.0~3.6V, DVDD18=1.7~1.9V, VSS1= VSS2= VSS3= VSS4= 0V,
CL=100pF)
Parameter
Symbol
min
typ
max Unit
DMDAT
DMDAT Setup Time
tDMDS
50
ns
DMDAT Hold Time
tDMDH
0
ns
DMCLK
Frequency
fDMCK
0.5
64fs
3.1
MHz
Duty Cycle
dDMCK
40
50
60
%
Rise Time
tDMCKR
10
ns
Fall Time
tDMCKF
10
ns
Note 44. Clock frequency is depend on the sampling rate (fs) which is set by CKM[1:0] or DFS[1:0] bits.
■ I²C BUS Interface
(Ta= -20ºC ~ 85ºC; AVDD=HVDD=DVDD= 3.0V ~ 3.6V, DVDD18= 1.7V ~ 1.9V, VSS1=VSS2=VSS3=VSS4=0V;
CL=20pF)
I²C Timing
Parameter
Symbol
min
typ max Unit
SCL clock frequency
fSCL
400 KHz
Bus Free Time Between Transmissions
tBUF
1.3
μs
Start Condition Hold Time (prior to first Clock tHD:STA
0.6
μs
pulse)
Clock Low Time
tLOW
1.3
μs
Clock High Time
tHIGH
0.6
μs
Setup Time for Repeated Start Condition
tSU:STA
0.6
μs
SDA Hold Time from SCL Falling
tHD:DAT
0
0.9
μs
SDA Setup Time from SCL Rising
tSU:DAT
0.1
μs
Rise Time of Both SDA and SCL Lines
tR
0.3
μs
Fall Time of Both SDA and SCL Lines
tF
0.3
μs
Setup Time for Stop Condition
tSU:STO
0.6
μs
Pulse Width of Spike Noise Suppressed
tSP
0
by Input Filter
50
ns
Capacitive load on bus
Cb
400
pF
Note 45. I²C-bus is a trademark of NXP B.V.
MS1138-E-01-PB
19
2012/03