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參數(shù)資料
| 型號(hào)： | MAX3658 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 622Mbps, Low-Noise, High-Gain Transimpedance Preamplifier |
| 中文描述： | 622Mbps、低噪聲、高增益互阻前置放大器 |
| 文件頁數(shù)： | 8/14頁 |
| 文件大?。?/td> | 2011K |
| 代理商： | MAX3658 |
M
Select C
COUPLE
so the low-frequency cutoff due to the
load resistors and coupling capacitors is much lower
than the low-frequency cutoff of the MAX3658. The cou-
pling capacitor should be 0.1μF or larger for SONET
data. For lowest jitter, 1.0μF is recommended. Refer to
application note HFAN-1.1:
Choosing AC-Coupling
Capacitors
for a more detailed discussion on choosing
AC-coupling capacitors.
Select Output Filter
Input sensitivity is improved by adding a filter between
TIA and the quantizer/limiting amplifier, with 0.5pF input
capacitance. Typical bandwidth of the MAX3658 is
580MHz; the highest expected bandwidth is 730MHz.
Layout Considerations
Figure 3 shows suggested layouts for 4- and 5-pin TO
headers.
Wire Bonding
For high-current density and reliable operation, the
MAX3658 uses gold metalization. For best results, use
gold-wire ball-bonding techniques. Use caution when
wedge bonding. Die-size is 52 mils x 29 mils, (1.32mm
x 0.736mm) and die thickness is 15 mils (380μm). The
bond-pad passivation opening is 75μm and bond-pad
metal thickness is 5μm. Refer to Maxim application note
HFAN-08.0.1:
Understanding Bonding Coordinates and
Physical Die Size
for additional information on bond-
pad coordinates.
Applications Information
Optical Power Relations
Many of the MAX3658 specifications relate to the input
signal amplitude. When working with optical receivers,
the input is sometimes expressed in terms of average
optical power and extinction ratio. Figure 4 and Table 1
show relations that are helpful for converting optical
power to input signal when designing with the MAX3658.
Optical Sensitivity Calculation
The input-referred RMS noise current (i
n
) of the
MAX3658 generally determines the receiver sensitivity.
To obtain a system bit-error rate (BER) of 1E-10, the
signal-to-noise ratio must always exceed 12.7. The
input sensitivity, expressed in average power, can be
estimated as:
SENSITIVITY
i
r
r
dBm
e
e
log
12.
+
×
ρ
×
=
(
)
×
(
)
10
1
2
1
1000
622Mbps, Low-Noise, High-Gain
Transimpedance Preamplifier
8
_______________________________________________________________________________________
5-PIN HEADER
4-PIN HEADER
PHOTODIODE
MOUNTED ON C
OUTPUT POLARITIES
REVERSED FOR MAX3658B
CASE IS GROUND
PHOTODIODE
MOUNTED ON C
OUTPUT POLARITIES
REVERSED FOR MAX3658B
CASE IS GROUND
PHOTODIODE
MAX3658A
F
I
M
PHOTODIODE
MAX3658A
F
I
M
C
VCC2
C
VCC2
V
CC
OUT-
OUT+
V
CC
OUT-
MON
OUT+
Figure 3. Suggested TO Header Layouts
Table 1. Optical Power Relations*
PARAMETER
SYMBOL
RELATION
Average Power
P
AVG
P
P
P
AVG
+
2
1
0
=
0
1
Extinction Ratio
r
e
r
P
P
e
=
Optical Power of a 1
P1
P
P
r
+
r
AVG
e
e
1
2
1
=
Optical Power of a 0
P0
P
P
r
AVG
+
P
r
r
e
0
2
1
=
Optical Modulation
Amplitude
P
IN
P
P
P
IN
AVG
e
e
+
=
=
1
0
2
1
1
*
Assuming a 50% average mark density.
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相關(guān)代理商/技術(shù)參數(shù) |
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| MAX3658AETA+T | 功能描述:跨阻抗放大器 622Mbps Transimpedance Pream RoHS:否 制造商:Texas Instruments 封裝 / 箱體:SOIC-14 帶寬:3 MHz 工作電源電壓:36 V 電源電流:5.5 mA 工作溫度范圍:- 40 C to + 85 C 封裝:Tube |
| MAX3658AETA-T | 功能描述:跨阻抗放大器 622Mbps Transimpedance Pream RoHS:否 制造商:Texas Instruments 封裝 / 箱體:SOIC-14 帶寬:3 MHz 工作電源電壓:36 V 電源電流:5.5 mA 工作溫度范圍:- 40 C to + 85 C 封裝:Tube |
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