AD6623,pdf datasheet (4-Channe

Register address notation and bit assignment referred to throughout
this data sheet are as follows: There are eight, one-digit “External”
register addresses in decimal format. “Internal” address notation
(read from left to right) begins with “0x”, meaning the address
that follows is hexadecimal. The next three characters represent
the address. The first number or character is the MSB of the
address. If an “n” is present, its value can be 1, 2, 3, or 4 and it
depends upon the channel that is being addressed (A, B, C, or D).
The remaining two digits preceding the colon (if present) are the
LSBs of the address. If a colon follows the address, then the
succeeding digits tell the user what bit number(s) is/are involved
in decimal format. For example, 0xn24:7-0.