参数资料
型号: AD9557BCPZ
厂商: Analog Devices Inc
文件页数: 50/92页
文件大小: 0K
描述: IC CLOCK TRANSLATOR 40LFCSP
产品变化通告: Minor Mask Change 11/Apr/2012
标准包装: 1
类型: 时钟/频率转换器
PLL:
主要目的: 以太网,SONET/SDH
输入: CMOS,LVDS,LVPECL
输出: CMOS,HSTL,LVDS
电路数: 1
比率 - 输入:输出: 2:2
差分 - 输入:输出: 是/是
频率 - 最大: 1.25GHz
电源电压: 1.71 V ~ 3.465 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 40-VFQFN 裸露焊盘,CSP
供应商设备封装: 40-LFCSP-VQ(6x6)
包装: 托盘
AD9557
Data Sheet
Rev. B | Page 54 of 92
PIN PROGRAM FUNCTION DESCRIPTION
The AD9557 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 AD9557 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]
M0 Pin
B3
B2
B1
B0
0
0.008
8 kHz
0
1
19.44
19.44 MHz
0
1
2
25
25 MHz
1
0
1
0
Table 33. Preset Output 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[7:4]
M3 Pin
M2 Pin
M1 Pin
B7
B6
B5
B4
0
19.44
19.44 MHz
0
1
25
25 MHz
0
0
1
2
125
125 MHz
0
1
0
1
0
3
156.7071
156.25 MHz × 1027/1024
0
0
1
4
622.08
622.08 MHz
0
0
1
0
5
625
625 MHz
0
1
0
1
0
1
6
644.53125
625 MHz × 33/32
0
1
0
1
0
7
657.421875
657.421875 MHz
0
1
1
8
660.184152
657.421875 MHz × 239/238
0
1
0
9
666.5143
622.08 MHz × 255/238
0
1
0
1
10
669.3266
622.08 MHz × 255/237
0
1
0
1
0
11
672.1627
622.08 MHz × 255/236
0
1
0
1
12
690.5692
644.53125 MHz × 255/238
0
1
0
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