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Data Sheet

AD9154

Rev. C | Page 25 of 124

DEVICE SETUP GUIDE

Follow these steps to properly set up the AD9154:

1. Set up the SPI interface, power up necessary circuit blocks,

make required writes to the configuration registers, and set

up the DAC clocks (see Step 1: Start Up the DAC).

2. Set the digital features of the AD9154 (see Step 2: Digital

Datapath).

3. Set up the JESD204B links (see Step 3: Transport Layer).

4. Set up the physical layer of the SERDES interface (see Step 4:

Physical Layer).

5. Set up the data link layer of the SERDES interface (see Step 5:

Data Link Layer).

6. Check for errors (see Step 6: Error Monitoring).

7. Enable any additional datapath features needed as

described in Table 19.

A specific working start-up sequence example is given in the

Example Start-Up Sequence section.

The register writes listed in Table 15 to Table 22 are necessary

writes to set up the AD9154. Consider printing out this setup

guide and filling in the Value column with appropriate variable

values for the conditions of the desired application.

The value notation 0x without a specified value setting indicates

unknown register values, select the correct settings for each

variable listed in the Variable column of Table 15 to Table 22.

The Description column describes how to set variables, or

provides a link to a section where this procedure is described.

used in all cases.

A variable is noted by concatenating multiple terms. For example,

PdDACs is a variable corresponding to the value that is determined

for Register 0x011[6:3] in the Device Setup Guide section.

STEP 1: START UP THE DAC

This section describes how to set up the SPI interface, power up

necessary circuit blocks, as well as the required writes to the

configuration registers, and how to set up the DAC clocks.

Table 15. Power-Up and DAC Initialization Settings

Addr.

Bit

No.

Value1

Variable

Description

0x000

0xBD

Soft reset.

0x000

0x3C

Deassert reset, set 4-wire SPI.

0x011

Power-up band gap.

[6:3]

PdDACs

PdDACs = 0 if all four DACs are

being used. If not, see the DAC

Power-Down Setup section.

0x080

[7:6]

PdClocks

PdClocks = 0 if all four DACs are

being used. If not, see the DAC

Power-Down Setup section.

0x1

DUTY_EN

Always set DUTY_EN = 2

0x081

PdSysref

PdSysref = 0x00 for Subclass 1.

PdSysref = 0x10 for Subclass 0.

See the Subclass Setup section

for details on subclass.

0x denotes a register value that the user must fill in. See the Variable and

Description columns for information on selecting the appropriate register value.

The registers in Table 16 must be written to and the values changed

from default for the device to work correctly. These registers must

be written to after any soft reset, hard reset, or on a power-up.

Table 16. Required Device Configurations

Addr.

Value

Description

0x12D

0x8B

Digital datapath configuration

0x146

0x01

Digital datapath configuration

0x333

0x01

JESD interface configuration

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