Datasheet

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 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0
Start 0 Adr 3 Adr 2 Adr 1 Adr 0 R/W 0
Register Read
A read operation is specified by setting the R/W bit high. Data will be output by the MAX11901 after the 8th rising SCLK
edge. Figure 12 shows the waveform for a mode register read.
Figure 11. Mode Register Write
Figure 12. Register Read
CNVST
SCLK
DIN
DOUT
0ST
A3 A2 A0 D15 D14R/W 0 D1 D0A1
CNVST
SCLK
DIN
DOUT
0ST
A3 A2 A0
D7 D6
0
D1 D0
A1 R/W
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MAX11901 16-Bit, 1.6Msps, Low-Power,
Fully Differential SAR ADC