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參數(shù)資料
| 型號： | MAX3267 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 1.25Gbps/2.5Gbps, 3V to 5.5V, Low-Noise Transimpedance Preamplifiers for LANs |
| 中文描述： | 1.25Gbps/2.5Gbps、+3V至+5.5V、低噪聲互阻前置放大器，用于LAN |
| 文件頁數(shù)： | 7/8頁 |
| 文件大?。?/td> | 152K |
| 代理商： | MAX3267 |
M
1.25Gbps/2.5Gbps, 3V to 5.5V, Low-Noise
Transimpedanc e Preamplifiers for LANs
_______________________________________________________________________________________
7
Optic al Linear Range
The MAX3266 has high gain, which limits the output
when the input signal exceeds 30μAp-p (40μAp-p for
MAX3267). The MAX3266 operates in a linear range for
inputs not exceeding:
Layout Considerations
Use good high-frequency design and layout tech-
niques. The use of a multilayer circuit board with sepa-
rate ground and power planes is recommended.
Connect the GND pins to the ground plane with the
shortest possible traces.
Noise performance and bandwidth will be adversely
affected by capacitance at the IN pin. Minimize capaci-
tance on this pin and select a low-capacitance photodi-
ode. Assembling the MAX3266 in die form using chip
and wire technology provides the best possible perform-
ance. Figure 6 shows a suggested layout for a TO
header.
The SO package version of the MAX3266 is offered as
an easy way to characterize the circuit and become
familiar with the circuit’s operation, but it does not offer
optimum performance. When using the SO version of
the MAX3266, the package capacitance adds approxi-
mately 0.3pF at the input. The PC board between the
MAX3266 input and the photodiode also adds parasitic
capacitance. Keep the input line short, and remove
power and ground planes beneath it.
Photodiode Filter
Supply voltage noise at the cathode of the photodiode
produces a current I = C
PD
V/
t, which reduces the
receiver sensitivity (C
PD
is the photodiode capaci-
tance.) The filter resistor of the MAX3266, combined
with an external capacitor, can be used to reduce this
noise (refer to the Typical Application Circuit. Current
generated by supply noise voltage is divided between
C
FILTER
and C
PD
. The input noise current due to supply
noise is (assuming the filter capacitor is much larger
than the photodiode capacitance):
I
NOISE
= (V
NOISE
)(C
PD
) / (R
FILTER
)(C
FILTER
)
If the amount of tolerable noise is known, the filter
capacitor can be easily selected:
C
FILTER
= (V
NOISE
)(C
PD
) / (R
FILTER
)(I
NOISE
)
For example, with maximum noise voltage = 100mVp-p,
C
PD
= 0.85pF, R
FILTER
= 1.5k
, and I
NOISE
selected to
be 100nA (1/2 of the MAX3266’s input noise):
C
FILTER
= (100mV)(0.85pF) / (1500
)(100nA) = 570pF
Wire Bonding
For high current density and reliable operation, the
MAX3266 uses gold metalization. Connections to the
die should be made with gold wire only, using ball
bonding techniques. Wedge bonding is not recom-
mended. Die thickness is typically 15 mils (0.375mm).
Linear Range
A r
(
(
r
dBm
e
e
log
+
=
)
)
10
30
1
2
1
1000
μ
ρ
Figure 5. Optical Power Relations
PO
PI
P
AVE
TIME
O
PARAMETER
Average Power
Extinction Ratio
Optical Power
of a “1”
P1
r
e
P
AVE
SYMBOL
RELATION
P
AVE
= (P0 + P1)/2
r
e
= P1/P0
P1 = 2P
AVE
(r
e
) / (r
e
+ 1)
Optical Power
of a “0”
P0
P0 = 2P
AVE
/ (r
e
+ 1)
Signal
Amplitude
P
IN
P
IN
= P1 - P0
= 2P
AVE
(r
e
) / (r
e
+ 1)
Table 1. Optical Power Relations
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| MAX3266 | 32-Bit Digital Signal Controller with Flash 100-BGA MICROSTAR -40 to 125 |
| MAX3266-MAX3267 | 32-Bit Digital Signal Controller with Flash 100-LQFP -40 to 85 |
| MAX3266CSA | 32-Bit Digital Signal Controller with Flash 100-LQFP -40 to 125 |
| MAX3267CSA | 1.25Gbps/2.5Gbps, 3V to 5.5V, Low-Noise Transimpedance Preamplifiers for LANs |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX3267C/D | 功能描述:特殊用途放大器 RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補(bǔ)償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
| MAX3267CSA | 功能描述:跨阻抗放大器 Integrated Circuits (ICs) 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 |
| MAX3267CSA+ | 功能描述:跨阻抗放大器 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 |
| MAX3267CSA+T | 功能描述:跨阻抗放大器 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 |
| MAX3267CSA-T | 功能描述:跨阻抗放大器 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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