ADS54J40 datasheet(36/88 Pages) TI2

36 / 88 page

R/W

SDIN

SCLK

SEN

RESET

A11

A10

ADS54J20

SBAS766B – MAY 2016 – REVISED JANUARY 2017

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8.4.1.5 Serial Register Write: JESD Bank

The ADS54J20 is a dual-channel device and the JESD204B portion is configured individually for each channel by

using the CH bit. Note that the P bit must be set to 1 for register writes.

1. Drive the SEN pin low.

2. Select the JESD bank page. Note that the M bit = 1 and the P bit = 0.

–

Write address 4003h with 00h.

–

Write address 4005h with 01h to enable separate control for both channels.

–

For the main digital page: write address 4004h with 68h.

–

For the JESD digital page: write address 4004h with 69h.

–

For the JESD analog page: write address 4004h with 6Ah.

3. Set the M and P bits to 1, select channel A (CH = 0) or channel B (CH = 1), and write the register content as

shown in Figure 72. When a page is selected, multiple writes into the same page can be done.

Figure 72. JESD Serial Register Write Timing Diagram

8.4.1.5.1

Individual Channel Programming

By default, register writes are applied to both channels. To enable individual channel writes, write address 4005h

with 01h (default is 00h).

8.4.1.6 Serial Register Readout: JESD Bank

The content from one of the pages of the JESD bank can be read out by:

1. Driving the SEN pin low.

2. Selecting the JESD bank page. Note that the M bit = 1 and the P bit = 0.

–

Write address 4003h with 00h.

–

Write address 4005h with 01h to enable separate control for both channels.

–

For the main digital page: write address 4004h with 68h.

–

For the JESD digital page: write address 4004h with 69h.

–

For the JESD analog page: write address 4004h with 6Ah.

3. Setting the R/W, M, and P bits to 1, selecting channel A or channel B, and writing the address to be read

back.

4. Reading back the register content on the SDOUT pin; see Figure 73. When a page is selected, multiple read

backs from the same page can be done.

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