參數(shù)資料
型號: AD9558/PCBZ
廠商: Analog Devices Inc
文件頁數(shù): 63/104頁
文件大?。?/td> 0K
描述: BOARD EVAL FOR AD9558
產(chǎn)品變化通告: AD9558 Minor Metal Mask Change 17/Apr/2012
設(shè)計資源: AD9558 Eval Brd BOM
AD9558 Schematic
標準包裝: 1
系列: *
Data Sheet
AD9558
Rev. B | Page 61 of 104
SOFT PIN PROGRAMMING OVERVIEW
The soft pin program function is controlled by a dedicated
register section (Address 0x0C00 to Address 0x0C08). The
purpose of soft pin program is to use the register bits to mimic
the hard pins for the configuration section. When in soft pin
program mode, both SPI and I2C port are available.
Address 0x0C00[0] enables accessibility to Address 0x0C01
and Address 0x0C02 (Soft Pin Section 1). This bit must be
set in soft pin mode.
Address 0x0C03[0] enables accessibility to Address 0x0C04 to
Address 0x0C06 (Soft Pin Section 2). This bit must be set
in soft pin mode.
Address 0x0C01[3:0] select one of 16 input frequencies.
Address 0x0C01[7:4] select one of 16 output frequencies.
Address 0x0C02[1:0] select the system clock configuration.
Address 0x0C06[1:0] select one of four input frequency
tolerance ranges.
Address 0x0C06[3:2] select one of four DPLL loop
bandwidths.
Address 0x0C06[4] selects the DPLL phase margin.
Address 0x0C04[3:0] scales the REFA/REFB/REFC/REFD
input frequency down by divide-by-1, divide-by-4, divide-
by-8, divide-by-16 independently. For example, when
Address 0x0C01[3:0] = 0101 to select input frequency as
622.08 MHz for all REFA/REFB/REFC/REFD, setting
Address 0x0C04[1:0] = 0x01 scales down the REFA input
frequency to 155.52 MHz (= 622.08 MHz/4). This is done
by internally scaling the R divider for REFA up by 4× and
the REFA period up by 4×.
Address 0x0C05[3:0] scales the Channel 0/1/2/3 output
frequency down by divide-by-1, divide-by-4, divide-by-8,
or divide-by-16. (Channel 2 and Channel 3 are available
only for the AD9558).
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