ADS5401_16 Datasheet, PDF (24/49 Pages) Texas Instruments – Single 12-Bit 800-Msps Analog-to-Digital Converter

ADS5401
SLAS946B – APRIL 2013 – REVISED JANUARY 2016
Programming (continued)
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SCLK
SDENB
SDIO
RWB A6 A5 A4 A3 A2 A1 A0 D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
Read = 1
Write = 0
7 bit address space
16bit data: D15 is MSB, D0 is LSB
Figure 46. Serial Register Write Timing Diagram
8.5.3 Serial Register Readout
The device includes a mode where the contents of the internal registers can be read back using the SDO/SDIO
pins. This read-back mode may be useful as a diagnostic check to verify the serial interface communication
between the external controller and the ADC.
1. Drive SDENB pin low
2. Set the RW bit (A7) to 1. This setting disables any further writes to the registers
3. Initiate a serial interface cycle specifying the address of the register (A6 to A0) whose content has to be
read.
4. The device outputs the contents (D15 to D0) of the selected register on the SDO/SDIO pin
5. The external controller can latch the contents at the SCLK rising edge.
6. To enable register writes, reset the RW register bit to 0.
SCLK
SDENB
SDIO
RWB A6 A5 A4 A3 A2 A1 A0 D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
Read = 1
Write = 0
7 bit address space
16bit data: D15 is MSB, D0 is LSB
Figure 47. Serial Register Read Timing Diagram
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