MAX11902 Datasheet, PDF (22/29 Pages) Maxim Integrated Products – Fully Differential SAR ADC

MAX11902
18-Bit, 1Msps, Low-Power,
Fully Differential SAR ADC
Register Write
All SPI operations start with a command word. The structure of the command word is shown below. If there is no start
bit, i.e. DIN is low, the part will output the conversion result and then go idle (see Figures 5, 6, and 7). The 16-bit mode
register is the only register that can be written to. Figure 11 shows the waveform for a mode register write operation.
BIT 7
Start
BIT 6
0
BIT 5
Adr 3
BIT 4
Adr 2
BIT 3
Adr 1
BIT 2
Adr 0
BIT 1
R/W
BIT 0
0
CNVST
DOUT
SCLK
DIN
ST
0
A3
A2
A1
A0
R/W
0
D15
D14
D1
D0
Figure 11. Mode Register Write
Register Read
A read operation is specified by setting the R/W bit high. Data will be output by the MAX11902 after the 8th rising SCLK
edge. Figure 12 shows the waveform for a mode register read.
CNVST
DOUT
D7
D6
D1
D0
SCLK
DIN
ST
0
Figure 12. Register Read
A3
A2
A1
A0
R/W
0
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