AD9558 datasheet(61/104 Pages) AD

61 / 104 page

Data Sheet

AD9558

Rev. A | Page 61 of 104

SOFT PIN PROGRAMMING OVERVIEW

The soft pin program function is controlled by a dedicated

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).

AD9558 Datasheet(PDF) 61 Page - Analog Devices

AD9558 Datasheet(HTML) 61 Page - Analog Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL