參數(shù)資料
型號: AD9558BCPZ
廠商: Analog Devices Inc
文件頁數(shù): 60/104頁
文件大?。?/td> 0K
描述: IC CLOCK TRANSLATOR 64LFCSP
產(chǎn)品變化通告: AD9558 Minor Metal Mask Change 17/Apr/2012
標準包裝: 1
類型: 時鐘/頻率轉(zhuǎn)換器
PLL:
主要目的: 以太網(wǎng),SONET/SDH,Stratum
輸入: CMOS,LVDS,LVPECL
輸出: CMOS,HSTL,LVDS
電路數(shù): 1
比率 - 輸入:輸出: 4:6
差分 - 輸入:輸出: 是/是
頻率 - 最大: 1.25GHz
電源電壓: 1.71 V ~ 3.465 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 64-VFQFN 裸露焊盤,CSP
供應(yīng)商設(shè)備封裝: 64-LFCSP-VQ(9x9)
包裝: 托盤
Data Sheet
AD9558
Rev. B | Page 59 of 104
PIN PROGRAM FUNCTION DESCRIPTION
The AD9558 supports both hard pin and soft pin program
function with the on-chip ROM containing the predefined
configurations. When a pin program function is enabled and
initiated, the selected predefined configuration is transferred
from the ROM to the corresponding registers to configure the
part into the desired state.
OVERVIEW OF ON-CHIP ROM FEATURES
Input/Output Frequency Translation Configuration
The AD9558 has one on-chip ROM that contains a total of 256
different input-output frequency translation configurations for
independent selection of 16 input frequencies and 16 output
frequencies. Each input/output frequency translation configuration
assumes that all input frequencies are the same and all the output
frequencies are the same. Each configuration reprograms the
following registers/parameters:
Reference input period register
Reference divider R register
Digital PLL feedback divider register (Fractional Part
FRAC1, Modulus Part MOD1 and Integer Part N1) free run
Tuning word register
Output PLL feedback divider N2 register
RF divider register
Clock distribution channel divider register
All configurations are set to support one single system clock
frequency as 786.432 MHz (16× the default 49.152 MHz system
clock reference frequency).
Four Different System Clock PLL Configurations
REF = 49.152 MHz XO (×2 on, N = 8)
REF = 49.152 MHz XTAL (×2 on, N = 8)
REF = 24.756 MHz XTAL (×2 on, N = 16)
REF = 98.304 MHz XO (×2 off, N = 8)
Four Different DPLL Loop Bandwidths
1 Hz, 10 Hz, 50 Hz, 100 Hz
DPLL Phase Margin
Normal phase margin (70°)
High phase margin (88.5°)
The ROM also contains an APLL VCO calibration bit. This bit
is used to program Register 0x0405[0] (from 0) to 1 to generate
a low-high transition to automatically initiate APLL VCO cal.
Table 32. Preset Input Frequencies for Hard Pin and Soft Pin Programming
Freq ID
Frequency (MHz)
Frequency Description
Hard Pin Program
PINCONTROL = High
Soft Pin Program
PINCONTROL = Low
Register 0x0C01[3:0]
M5 Pin
M4 Pin
M0 Pin
B3
B2
B1
B0
0
0.008
8 kHz
0
1
19.44
19.44 MHz
0
0
1
2
25
25 MHz
0
1
0
1
0
3
125
125 MHz
0
0
1
4
156.7072
156..25 MHz × 1027/1024
0
0
1
0
5
622.08
622.08 MHz
0
1
0
1
0
1
6
625
625 MHz
0
1
0
1
0
7
644.53125
625 MHz × 33/32
0
1
0
1
0
8
657.421875
657.421875 MHz
0
1
0
1
9
660.184152
657.421875 MHz × 239/238
0
1
0
10
669.3266
622.08 MHz × 255/238
0
1
0
1
11
672.1627
622.08 MHz × 255/236
0
1
0
1
0
12
690.569
622.08 MHz × 255/236
0
1
0
1
13
693.48299
644.53125 MHz × 255/238
1
0
14
693.482991
644.53125 MHz × 255/237
1
15
698.81236
622.08 × 255/237
1
0
1
0
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