- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄384666 > MAX3867ECM (MAXIM INTEGRATED PRODUCTS INC) +3.3V, 2.5Gbps SDH/SONET Laser Driver with Automatic Power Control PDF資料下載
參數(shù)資料
| 型號： | MAX3867ECM |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 其它接口 |
| 英文描述： | +3.3V, 2.5Gbps SDH/SONET Laser Driver with Automatic Power Control |
| 中文描述： | SPECIALTY INTERFACE CIRCUIT, PQFP48 |
| 封裝： | MO-136BE, TQFP-48 |
| 文件頁數(shù)： | 10/12頁 |
| 文件大?。?/td> | 193K |
| 代理商： | MAX3867ECM |
M
pattern-dependent jitter, three external components
must be properly chosen: capacitor C
APC
, which domi-
nates the APC loop time constant; pull-up inductor L
P
;
and AC-coupling capacitor C
D
.
To filter out noise effects and guarantee loop stability,
the recommended value for C
APC
is 0.1μF. This results
in an APC loop bandwidth of 10kHz or a time constant
of 16μs. As a result, the pattern-dependent jitter associ-
ated with an APC loop time constant can be ignored.
The time constant associated with the output pull-up
inductor (L
P
), and the AC-coupling capacitor (C
D
), will
also impact the pattern-dependent jitter. For such a
second-order network, the PDJ due to the low frequen-
cy cutoff will be dominated by L
P
. For a data rate of
2.5Gbps, the recommended value for C
D
is 0.056μF.
During the maximum CID period t
,
it is recommended
to limit the peak voltage droop to less than 12% of the
average (6% of the amplitude). The time constant can
be estimated by:
12% = 1 - e
τ
LP
= 7.8t
If
τ
LP
= L
P
/25
, and t = 100UI = 40ns, then L
P
= 7.8μH.
To reduce the physical size of this element (L
P
), use of
SMD ferrite beads is recommended (Figure 2).
-t
/
τ
L
P
Input T ermination Requirement
The MAX3867 data and clock inputs are PECL-compat-
ible. However, it is not necessary to drive the MAX3867
with a standard PECL signal. As long as the specified
common-mode voltage and the differential voltage
swings are met, the MAX3867 will operate properly.
Calc ulate Power Consumption
The junction temperature of the MAX3867 dice must be
kept below +150°C at all times. The total power dissipa-
tion of the MAX3867 can be estimated by the following:
P = V
CC
·
V
CC
+ (V
CC
- V
f
)
·
I
BIAS
+ I
MOD
(V
CC
- 25
·
I
MOD
/ 2)
where I
BIAS
is the maximum bias current set by R
BIAS-
MAX
, I
MOD
is the modulation current, and V
f
is the typi-
cal laser forward voltage.
J unction temperature = P(W)
·
48 (°C/W)
Applic ations Information
The following is an example of how to set up the
MAX3867.
S elec t Laser
A communication-grade laser should be selected for
2.488Gbps applications. Assume the laser output aver-
age power is P
AVE
= 0dBm, minimum extinction ratio is
r
e
= 6.6 (8.2dB), the operating temperature is -40°C to
+85°C, and the laser diode has the following character-
istics:
Wavelength:
Threshold Current:
Threshold Temperature
Coefficient:
Laser to Monitor Transfer:
Laser Slope Efficiency:
λ
= 1.3μm
Ι
TH
= 22mA at +25°C
β
TH
= 1.3%/°C
ρ
MON
= 0.2A/W
η
= 0.05mW/mA
at +25°C
Determine R
APCS ET
The desired monitor diode current is estimated by
I
MD
= P
AVE
·
ρ
MON
= 200μA. The I
MD
vs. R
APCSET
graph in the Typical Operating Characteristics shows
that R
APCSET
should be 6.0k
.
Determine R
MODS ET
To achieve a minimum extinction ratio (r
e
) of 6.6dB over
temperature and lifetime, calculate the required extinc-
tion ratio at 25°C. Assuming r
e
= 20, the peak-to-peak
optical power P
p-p
= 1.81mW according to Table 1. The
required modulation current is 1.81(mW) / 0.05(mW/mA)
= 36.2mA. The I
MOD
vs. R
MODSET
graph in the Typical
Operating Characteristics shows that R
MODSET
should
be 4.8k
.
Determine R
BIAS MAX
Calculate the maximum threshold current (I
TH(MAX)
) at
T
A
= +85°C and end of life. Assuming I
TH(MAX)
=
50mA, the maximum bias current should be:
I
BIASMAX
= I
TH(MAX)
+ I
MOD
/2
In this example, I
BIASMAX
= 68.1mA. The I
BIASMAX
vs.
R
BIASMAX
graph in the Typical Operating Characteristics
shows that R
BIASMAX
should be 3.2k
.
+3.3V, 2.5Gbps S DH/S ONET Laser Driver
with Automatic Power Control
10
______________________________________________________________________________________
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX3867 | +3.3V, 2.5Gbps SDH/SONET Laser Driver with Automatic Power Control |
| MAX3875EHJ | 2.5Gbps, Low-Power, #.3V Clock Recovery and Data Retiming IC |
| MAX3875 | 16-Channel LVDM Transceiver 64-TSSOP -40 to 85 |
| MAX3876EHJ | 2.5Gbps, Low-Power, #.3V Clock Recovery and Data Retiming IC |
| MAX3876 | 16-Channel LVDM Transceiver 64-TSSOP -40 to 85 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX3869E/D | 功能描述:激光驅(qū)動器 DICE SALES DICE12 RoHS:否 制造商:Micrel 數(shù)據(jù)速率:4.25 Gbps 工作電源電壓:3 V to 3.6 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-16 封裝:Tube |
| MAX3869E/D DIE | 制造商:Maxim Integrated Products 功能描述: |
| MAX3869E/D+ | 功能描述:激光驅(qū)動器 RoHS:否 制造商:Micrel 數(shù)據(jù)速率:4.25 Gbps 工作電源電壓:3 V to 3.6 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-16 封裝:Tube |
| MAX3869EGJ | 功能描述:激光驅(qū)動器 3.3V 2.5Gbps SDH/ SONET Laser Driver RoHS:否 制造商:Micrel 數(shù)據(jù)速率:4.25 Gbps 工作電源電壓:3 V to 3.6 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-16 封裝:Tube |
| MAX3869EGJEVKIT | 功能描述:激光驅(qū)動器 +3.3V 2.5Gbps SDH/SONET Laser Driver with Current Monitors and APC RoHS:否 制造商:Micrel 數(shù)據(jù)速率:4.25 Gbps 工作電源電壓:3 V to 3.6 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-16 封裝:Tube |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。