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| 型号： | MAX3872ETJ+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 2/15页 |
| 文件大小： | 0K |
| 描述： | IC DATA RECOVERY W/AMP 32-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 时钟和数据恢复（CDR），多路复用器 |
| PLL： | 是 |
| 主要目的： | 以太网，SONET/SDH |
| 输入： | CML |
| 输出： | CML |
| 电路数： | 1 |
| 比率 - 输入:输出： | 1:2 |
| 差分 - 输入:输出： | 是/是 |
| 频率 - 最大： | 2.67GHz |
| 电源电压： | 3 V ~ 3.6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 供应商设备封装： | 32-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
MAX3872
Setting the Loop Filter
The MAX3872 is designed for regenerator and receiver
applications. Its fully integrated PLL is a classic 2nd-order
feedback system, with a jitter transfer bandwidth (JBW)
below 2.0MHz. The external capacitor (CFIL) connected
from FIL to VCC_VCO sets the PLL loop damping. Note
that the PLL jitter transfer bandwidth does not change as
CFIL changes, but the jitter peaking, acquisition time, and
loop stability are affected. Figures 6 and 7 show the
open-loop and closed-loop transfer functions.
The PLL zero frequency, fZ, is a function of external
capacitor CFIL, and can be approximated according to:
For an overdamped system (fZ / JBW < 0.25), the jitter
peaking (JP) of a 2nd-order system can be approximat-
ed by:
where JBW is the jitter transfer bandwidth for a given
data rate.
The recommended value of CFIL = 0.82F is to guarantee
a maximum jitter peaking of less than 0.1dB for all data
rates. Decreasing CFIL from the recommended value
decreases acquisition time, with the tradeoff of increased
peaking. For data rates greater than OC-3, CFIL can be
less than 0.82F and still meet the jitter-peaking specifi-
cation.
Excessive reduction of CFIL might cause PLL instability.
CFIL must be a low-TC, high-quality capacitor of type
X7R or better.
J
f
J
P
Z
BW
=+
20
1
log
f
C
Z
FIL
=
Ω
1
2 650
π()
Multirate Clock and Data Recovery
with Limiting Amplifier
10
______________________________________________________________________________________
Table 3. Holdover Frequency Settings
REFERENCE CLOCK FREQUENCY (MHz)
SCLKO FREQUENCY
RS1
RS2
RATESET
FREFSET
666.51
2.667GHz
0
1
0
666.51
666.51MHz
0
1
0
666.51
166.63MHz
1
0
1
0
622.08/625
1.244/1.25GHz
1
0
622.08/625
2.488GHz/2.5GHz
0
622.08
622.08MHz
0
1
0
622.08
155.52MHz
1
0
166.63
2.67GHz
0
1
166.63
666.51MHz
0
1
166.63
166.63MHz
1
0
1
155.52/156.25
1.244/1.25GHz
1
0
1
155.52/156.25
2.488GHz/2.5GHz
0
1
155.52
622.08MHz
0
1
0
1
155.52
155.52MHz
1
0
1
CFIL = 0.82
μF
fZ = 299Hz
CFIL = 0.01
μF
fZ = 24.5kHz
HO(j2
πf) (dB)
OPEN-LOOP
GAIN
1000
f (kHz)
100
10
1
DATA RATE: 2.488Gbps
Figure 6. Open-Loop Transfer Function
CFIL = 0.82
μF
H(j2
πf) (dB)
1000
100
10
1
f (kHz)
-3
0
CLOSED-LOOP
GAIN
CFIL = 0.01
μF
DATA RATE: 2.488Gbps
Figure 7. Closed-Loop Transfer Function
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相关代理商/技术参数 |
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| MAX3872EVKIT | 功能描述:计时器和支持产品 Evaluation Kit for the MAX3872 MAX3874 RoHS:否 制造商:Micrel 类型:Standard 封装 / 箱体:SOT-23 内部定时器数量:1 电源电压-最大:18 V 电源电压-最小:2.7 V 最大功率耗散: 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装:Reel |
| MAX3873AEGP | 功能描述:计时器和支持产品 2.5/2.7Gbps Clk-Reco & Data-Retiming IC RoHS:否 制造商:Micrel 类型:Standard 封装 / 箱体:SOT-23 内部定时器数量:1 电源电压-最大:18 V 电源电压-最小:2.7 V 最大功率耗散: 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装:Reel |
| MAX3873AEGP+ | 制造商:Maxim Integrated Products 功能描述:CLOCK RECOVERY 20QFN - Bulk |
| MAX3873AEGP-T | 功能描述:计时器和支持产品 2.5/2.7Gbps Clk-Reco & Data-Retiming IC RoHS:否 制造商:Micrel 类型:Standard 封装 / 箱体:SOT-23 内部定时器数量:1 电源电压-最大:18 V 电源电压-最小:2.7 V 最大功率耗散: 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装:Reel |
| MAX3873AETP+ | 功能描述:计时器和支持产品 2.5/2.7Gbps Clk-Reco & Data-Retiming IC RoHS:否 制造商:Micrel 类型:Standard 封装 / 箱体:SOT-23 内部定时器数量:1 电源电压-最大:18 V 电源电压-最小:2.7 V 最大功率耗散: 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装:Reel |
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