AK7722 Datasheet, PDF (19/28 Pages) Asahi Kasei Microsystems – 24bit 4ch ADC + 24bit 4ch DAC with Audio DSP

[AK7722]
■ Microprocessor Interface
(Ta=-40ºC~85ºC; AVDD=DVDD=3.0~3.6V; CL=20pF)
Parameter
Symbol
min
typ
max
Unit
Microprocessor Interface Signal
RQN Fall Time
tWRF
30
ns
RQN Rise Time
tWRR
30
ns
SCLK Fall Time
tSF
30
ns
SCLK Rise Time
tSR
30
ns
SCLK Frequency
fSCLK
2.1
MHz
SCLK Low Level Width
tSCLKL
200
ns
SCLK High Level Width
tSCLKH
200
ns
Microprocessor → AK7722
RQN High Level Width
tWRQH
500
ns
From RQN “↓” to SCLK “↓”
tWSC
500
ns
From SCLK “↑” to RQN “↑”
tSCW
800
ns
SI Latch Setup Time
tSIS
200
ns
SI Latch Hold Time
tSIH
200
ns
AK7722 → Microprocessor
Delay Time from SCLK “↓”to SO Output
tSOS
200
ns
Hold Time from SCLK “↑” to SO Output (Note 38)
tSOH
200
ns
Note 38. Except for, when writing to 8th bit of command code.
■ I²C BUS Interface
(Ta=-40ºC~85ºC; AVDD=DVDD=3.0~3.6V)
Parameter
I²C Timing
Symbol
min
SCL clock frequency
fSCL
Bus Free Time Between Transmissions
tBUF
1.3
Start Condition Hold Time
(prior to first Clock pulse)
tHD:STA
0.6
Clock Low Time
tLOW
1.3
Clock High Time
tHIGH
0.6
Setup Time for Repeated Start Condition
tSU:STA
0.6
SDA Hold Time from SCL Falling
tHD:DAT
0
SDA Setup Time from SCL Rising
tSU:DAT
0.1
Rise Time of Both SDA and SCL Lines
tR
Fall Time of Both SDA and SCL Lines
tF
Setup Time for Stop Condition
tSU:STO
0.6
Pulse Width of Spike Noise Suppressed
by Input Filter
tSP
0
Capacitive load on bus
Cb
Note 39. I²C-bus is a trademark of NXP B.V.
typ max Unit
400
kHz
μs
μs
μs
μs
μs
0.9
μs
μs
0.3
μs
0.3
μs
μs
50
ns
400
pF
MS1328-E-00-PB
19
2011/09