ADA4356ABCZ datasheet(51/61 Pages) AD

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Data Sheet

ADA4356

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Rev. 0

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MEMORY MAP

Overview

The memory map register Table 18 describes the ADA4356 registers. These registers configure and control the ADC

only.

The memory map is divided into three sections: the chip configuration registers, the device index register, and the

global ADC function registers, including setup and control.

Each register has 8-bit locations. The column with the Bit 7 (MSB) heading contains the most significant bit of the

default hexadecimal value given. For example, Register 0x05, the device index register, has a hexadecimal default

value of 0x33, which means that in Register 0x05, Bits[7:6] = 00, Bits[5:4] = 11, Bits[3:2] = 00, and Bits [1:0] = 11 (in

binary).

For more details on this SPI port function, see the Application Note AN-877: Interfacing to High Speed ADCs via SPI.

This application note documents the functions controlled by Register 0x00 to Register 0xFF.

Open Locations

In Table 18, the register bit open locations are reserved to the ADA4356. These bits must be always set to 0.

Default Values

The default values are available in Table 18.

After power-on, all registers have loaded their default values. To soft reset the ADA4356, use Register 0x00. All

registers, except the read-only register (Register 0x02), are loaded with default values.

Logic Levels

An explanation of logic level terminology follows:



Bit is set is synonymous with bit is set to Logic 1 or writing Logic 1 for the bit.



“Clear a bit is synonymous with bit is set to Logic 0 or writing Logic 0 for the bit.

Memory Map Register Table

The ADA4356 uses a 3-wire interface and 16-bit addressing. Therefore, Bit 0 and Bit 7 in Register 0x00 are set to 0, and

Bit 3 and Bit 4 are set to 1.

When Bit 5 in Register 0x00 is set high, the SPI enters a soft reset, where all the user registers revert to their default

values, and Bit 2 is automatically cleared.

Table 18.Memory Map Register

REG.

(HEX)

NAME

BIT 7

(MSB)

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

(LSB)

DEFAULT

VALUE

(HEX)

COMMENTS

CHIP CONFIGURATION REGISTERS

0x00

SPI port

configuration

0 =

SDO

active

LSB

first

Soft

reset

1 = 16-

bit

address

1 = 16-bit

address

Soft

reset

LSB

first

0 = SDO

active

0x18

Nibbles are

mirrored to

allow a

given

value to

perform the

same

function for

either MSB-

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