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參數(shù)資料
| 型號： | MAX3877 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Half-Duplex LVDM Transceiver 8-SOIC -40 to 85 |
| 中文描述： | 2.5Gbps、+3.3V時鐘與數(shù)據(jù)再定時IC，帶有垂直調(diào)節(jié)閾值 |
| 文件頁數(shù)： | 12/16頁 |
| 文件大?。?/td> | 550K |
| 代理商： | MAX3877 |
M
2.5Gbps, +3.3V Clock and Data Retiming ICs
with Vertical Threshold Adjust
12
______________________________________________________________________________________
Jitter Tolerance and Input Sensitivity
Trade-Offs
When the received data amplitude is higher than
10mVp-p, the MAX3877/MAX3878 provide a typical jit-
ter tolerance of 0.64UI at jitter frequencies greater than
10MHz. The SDH/SONET jitter tolerance specification is
0.15UI, leaving a jitter allowance of 0.49UI for receiver
preamplifier and postamplifier design.
The BER is better than 1
10
-10
for input signals
greater than 4mVp-p. At 5mVp-p, jitter tolerance will be
degraded, but will still be above the SDH/SONET
requirement. The user can make a trade-off between jit-
ter tolerance and input sensitivity according to the spe-
cific application. Refer to
Typical Operating
Characteristics
for Jitter Tolerance and BER vs. Input
Amplitude.
Applications Information
Holdover Mode
When in holdover mode, the MAX3877/MAX3878 can
lock to an external reference clock to maintain a valid
clock output in the absence of input data. When LREF is
high, the PLL locks to an external 155.52MHz reference
clock, which is applied to the SLBI inputs. To enter
holdover mode automatically when there are no transi-
tions to the SDI inputs, LOS can be directly tied to LREF.
By maintaining frequency lock, the time required to re-
acquire lock is reduced.
System Loopback
The system loopback input may be used as an auxiliary
input for system loopback testing or as input for an exter-
nal 155.52MHz reference clock. When used as a loop-
back test, the user can connect a serializer output in a
transceiver directly to the SLBI inputs for system diag-
nostics. Using an external reference clock can maintain
PLL frequency lock in the absence of transitions on the
SDI inputs.
Consecutive Identical Digits (CID)
The MAX3877/MAX3878 have low frequency drift in the
absence of data transitions. As a result, long runs of con-
secutive zeros and ones can be tolerated while maintain-
ing a BER better than 1
10
-10
. The CID tolerance is
tested using a 2
13
- 1PRBS, substituting a long run of
zeros to simulate the worst case. A CID tolerance of
2000 bits is typical.
The VCO frequency after 4096 bits (approximately 1.6μs)
may be estimated by using the VCO drift rate:
Exposed Pad (EP) Package
The exposed pad, 32-pin TQFP incorporates features
that provide a very low thermal-resistance path for heat
removal from the IC. The pad is electrical ground on the
MAX3877/MAX3878 and should be soldered to the cir-
cuit board for proper thermal and electrical performance.
f
GHz
s
kHz
s
μ
2 488
.
GHz
kHz
GHz
ppm
=
±
μ ×
10 21
.
=
±
=
±
2 488
.
1 65
.
6 2
.
2 488
.
4 1
.
MAX3877
50
50
V
CC
100
PECL
LEVELS
SDI+
25
25
0.1
μ
F
0.1
μ
F
SDI-
Figure 10. Interfacing with PECL Levels
MAX3877
V
CC
50
SDO+
SDO-
50
Figure 11. CML Outputs
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX3877E/D | 功能描述:計時器和支持產(chǎn)品 RoHS:否 制造商:Micrel 類型:Standard 封裝 / 箱體:SOT-23 內(nèi)部定時器數(shù)量:1 電源電壓-最大:18 V 電源電壓-最小:2.7 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Reel |
| MAX3877EHJ | 功能描述:計時器和支持產(chǎn)品 2.5Gbps 3.3V Clock & Data Retiming IC RoHS:否 制造商:Micrel 類型:Standard 封裝 / 箱體:SOT-23 內(nèi)部定時器數(shù)量:1 電源電壓-最大:18 V 電源電壓-最小:2.7 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Reel |
| MAX3877EHJ-T | 功能描述:計時器和支持產(chǎn)品 2.5Gbps 3.3V Clock & Data Retiming IC RoHS:否 制造商:Micrel 類型:Standard 封裝 / 箱體:SOT-23 內(nèi)部定時器數(shù)量:1 電源電壓-最大:18 V 電源電壓-最小:2.7 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Reel |
| MAX3877EVKIT | 功能描述:計時器和支持產(chǎn)品 Evaluation Kit for the MAX3877 MAX3878 RoHS:否 制造商:Micrel 類型:Standard 封裝 / 箱體:SOT-23 內(nèi)部定時器數(shù)量:1 電源電壓-最大:18 V 電源電壓-最小:2.7 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Reel |
| MAX3878E/D | 功能描述:計時器和支持產(chǎn)品 2.5Gbps +3.3V Clock and Data Retiming ICs with vertical Threshold Adjust RoHS:否 制造商:Micrel 類型:Standard 封裝 / 箱體:SOT-23 內(nèi)部定時器數(shù)量:1 電源電壓-最大:18 V 電源電壓-最小:2.7 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Reel |
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