AK7744VT Datasheet, PDF (14/50 Pages) Asahi Kasei Microsystems – 24bit 3ch ADC + 24bit 4ch DAC with Audio DSP

[ASAHI KASEI]
[AK7744]
5-4) Microcomputer interface
(AVDD=DVDD=3.0V~3.6V,Ta=-40~85°C,CL=20pF)
Parameter
Symbol
min
Microcomputer interface signal
RQ Fall time
tWRF
RQ Rise time
tWRR
SCLK fall time
tSF
SCLKrise time
tSR
SCLK low level width
tSCLKL
30
SCLK high level width
tSCLKH
30
Microcomputer to AK7744
Time from RESET "↓" to RQ "↓"
tREW
200
Time from RQ "↑" to RESET "↑"
tWRE
200
Note 1)
RQ high level width
tWRQH
200
Time from RQ "↓" to SCLK"↓"
tWSC
200
Time from SCLK"↑" to RQ "↑"
tSCW
6×tMCLK
SI latch setup time
SI latch hold time
AK7744 to microcomputer
Time from SCLK"↑" to DRDY"↓"
Time from SI"↑"to DRDY"↓"
SI high level width
Delay time from SCLK"↓" to SO output
AK7744 to microcomputer
(RAM DATA read-out)
SI latch setup time (SI="H")
SI latch setup time (SI="L")
SI latch hold time
Time from SCLK"↓" to SO
AK7744 to microcomputer
(CRC result output) Note 2)
Delay time from RQ "↑" to SO output
tSIS
tSIH
tSDR
tSIDR
tSIH
tSOS
tRSISH
tRSISL
tRSIH
tSOD
tRSOC
100
100
3×tMCLK
30
30
30
Delay time from RQ "↓" to SO output ^tFSOC
50
Note 3)
typ
max
Unit
8
ns
8
ns
8
ns
8
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
3×tMCLK
ns
3×tMCLK
ns
ns
100
ns
ns
ns
ns
100
ns
150
ns
ns
Note 1) Except for external jump code set at reset state.
Note 2) When a surplus of the serial data D(x) divided by the generated polynomials expression G(x) is
equal to the R(x) then the SO indicates “H”.
Note 3) The Microcontroller should read 50ns before falling the RQ . ( It does not use RUN time. )
<MS0167-E-00>
- 14 -
2002/10