ADC32RF44 datasheet(56/128 Pages) TI2

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R/W

SDIN

SCLK

SEN

RESET

A11 A10

0/1

R/W

SDIN

SCLK

SEN

RESET

A11

A10

SDOUT

SDOUT [7:0]

ADC32RF42

SBAS844 – MAY 2017

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9.4.3.4 Serial Register Readout: Digital Bank

Readback of the register in one of the digital banks (as shown in Figure 86) can be accomplished by:

1. Driving the SEN pin low.

2. Selecting the page in the digital page: follow step 2 in the Serial Register Write: Digital Bank section.

3. Set the R/W, M, and P bits to 1, select channel A or channel B, and write the address to be read back.

–

JESD digital page: use the CH bit to select channel B (CH = 0) or channel A (CH = 1).

4. Read back the register content on the SDOUT pin. When a page is selected, multiple read backs from the

same page can be done.

Figure 86. SPI Read Timing Diagram for the Digital Bank

9.4.3.5 Serial Register Write: Decimation Filter and Power Detector Pages

The decimation filter and power detector pages are special pages that accept direct addressing. The sampling

clock and SYSREF signal are required to properly configure the decimation settings. Figure 87 shows that

registers located in these pages can be programmed in one SPI cycle.

1. Drive the SEN pin low.

2. Directly write to the decimation filter or power detector pages. To program registers in these pages, set M = 1

and CH = 1. Additionally, address bit A[10] selects the decimation filter page (A[10] = 0) or the power

detector page (A[10] = 1). Address bit A[11] selects channel A (A[11] = 0) or channel B (A[11] = 1).

–

Decimation filter page: write address 50xxh for channel A or 58xxh for channel B.

–

Power detector page: write address 54xxh for channel A or 5Cxxh for channel B.

Example: Writing address 5001h with 02h selects the decimation filter page for channel A and programs

decimation factor of divide-by-8 (complex output).

Figure 87. SPI Write Timing Diagram for the Decimation and Power Detector Pages

ADC32RF44 Datasheet(PDF) 56 Page - Texas Instruments

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