AD9212 datasheet(34/57 Pages) AD

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Data Sheet

AD9212

Rev. E | Page 33 of 56

MEMORY MAP

READING THE MEMORY MAP TABLE

Each row in the memory map register table (Table 16) has eight

address locations. The memory map is divided into three sections:

the chip configuration register map (Address 0x00 to Address 0x02),

the device index and transfer register map (Address 0x04,

Address 0x05, and Address 0xFF), and the ADC functions register

map (Address 0x08 to Address 0x22).

The leftmost column of the memory map indicates the register

address number; the default value is shown in the second right-

most column. The Bit 7 column is the start of the default

hexadecimal value given. For example, Address 0x09, the clock

Bit 5 = 0, Bit 4 = 0, Bit 3 = 0, Bit 2 = 0, Bit 1 = 0, and Bit 0 = 1, or

0000 0001 in binary. This setting is the default for the duty cycle

stabilizer in the on condition. By writing 0 to Bit 0 of this address

followed by writing 0x01 in Register 0xFF (transfer bit), the duty

cycle stabilizer turns off. It is important to follow each writing

sequence with a transfer bit to update the SPI registers. All

registers, except Register 0x00, Register 0x04, Register 0x05, and

writing to the transfer bit. For more information on this and

other functions, consult the AN-877 Application Note,

Interfacing to High Speed ADCs via SPI.

RESERVED LOCATIONS

Undefined memory locations should not be written to except

when writing the default values suggested in this data sheet.

Addresses that have values marked as 0 should be considered

reserved and have 0 written to their registers during power-up.

DEFAULT VALUES

When the AD9212 comes out of a reset, critical registers are

preloaded with default values. These values are indicated in

Table 16, where an X refers to an undefined feature.

LOGIC LEVELS

An explanation of various registers follows: “bit is set” is

synonymous with “bit is set to Logic 1” or “writing Logic 1 for

the bit.” Similarly, “clear a bit” is synonymous with “bit is set to

Logic 0” or “writing Logic 0 for the bit.”

AD9212 Datasheet(PDF) 34 Page - Analog Devices