AK2401 Datasheet, PDF (15/103 Pages) Asahi Kasei Microsystems – Direct Conversion Transceiver

[AK2401]
AD_FS
(Output)
Ich Data Output
Qch Data Output
AD_SCLK
(Output)
12 3
24 25 26 27
32 1 2 3
23 24 25 26
32
AD_SDO
(Output)
D23 D22
D1 D0 S13 S12
S7
D23 D22
D1 D0 S6 S5
S0
Figure 7. Interface Timing for ADC Data Read
Parameter
Symbol
Min.
Typ. Max. Unit
AD_SCLK Frequency
tCLK
*9
MHz
AD_SCLK High Pulse Width 20pF load
tHI
0.4 / tCLK
µsec
AD_SCLK Low Pulse Width 20pF load
tLO
0.4 / tCLK
µsec
Note:
* Digital output timings refer to a rising/falling signal of 0.5 VDD.
* 9. AD_SCLK frequency will be different according to the channel filter setting <Address 0x22>
DFIL_SEL[3:0] bits. Refer to “13.8.11 Output Sampling Rate” for details.
9.6. Serial Interface Timing for DAC Data Write
Data write to the DAC is executed via serial interface that is configured with the DA_FS, DA_SCLK and
DA_SDI pins. The D/A converter interface has shift register, and the data is written to the DA_SDI pin
(MSB first) in a synchronization with a DA_SLCK rising edge. Parallel converted data is send to the D/A
converter on a rising edge of the DA_FS pin and analog converted data is output to the SMFOUT pin. The
maximum operational frequency of the D/A converter is 200kHz. The D/A data consists of 12 bits. Data
input format is MSB first, 2’s complement. Input a 12-cycle clock during a period from a rising edge of the
DA_FS pin to a next rising edge of the DA_FS pin according the timing chart below. First 12 bits data is
valid when 12 bits or more clock and data are input.
DA_FS
(Input)
DA_SCLK
(Input)
DA_SDI
(Input)
tDACFS
tSCLH
tHI tLO
tSCS
tFSHW
tDS tDH
D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
Figure 8. Interface Timing for DAC Data Write
Parameter
DAC_FS Cycle Time
DA_FS High Pulse Width
DA_SCLK High Pulse Width
DA_SCLK Low Pulse Width
DA_SDI Setup Time
DA_SDI Hold Time
DA_SCLK Low Hold Time
DA_SCLK Setup Time
Symbol
t_DACFS
t_FSHW
t_HI
t_LO
t_DH
t_DS
t_SCLH
t_SCS
Min.
5
100
100
100
50
50
100
100
Typ.
Max.
Unit
µsec
nsec
nsec
nsec
nsec
nsec
nsec
nsec
017003093-E-00
15
2017/3