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參數(shù)資料
| 型號(hào)： | MAX3664ESA+T |
| 廠商： | Maxim Integrated Products |
| 文件頁(yè)數(shù)： | 11/12頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC PREAMP 622MBPS ULP 3.3V 8SOIC |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 類型： | 轉(zhuǎn)阻前置放大器 |
| 應(yīng)用： | 光纖學(xué)網(wǎng)絡(luò) |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SOIC |
| 包裝： | 帶卷 (TR) |
MAX3664
622Mbps, Ultra-Low-Power, 3.3V
Transimpedance Preamplifier for SDH/SONET
8
_______________________________________________________________________________________
Step 3: Designing Filters
The MAX3664’s noise performance is a strong function
of the circuit’s bandwidth, which changes over temper-
ature and varies from lot to lot. The receiver sensitivity
can be improved by adding filters to limit this band-
width. Filter designs can range from a one-pole filter
using a single capacitor, to more complex filters using
inductors. Figure 3 illustrates two examples: the simple
filter provides moderate roll-off with minimal compo-
nents, while the complex filter provides a sharper roll-
off and better transient response.
Supply voltage noise at the cathode of the photodiode
produces a current I = CPHOTO (
V/t), which reduces
the receiver sensitivity. CPHOTO is the photodiode
capacitance.
The FILT resistor of the MAX3664, combined with an
external capacitor (see
Typical Operating Circuit) can
be used to reduce this noise. The external capacitor
(CFILT) is placed in parallel with the photodiode.
Current generated by supply noise is divided between
CFILT and CPHOTO. The input noise current due to sup-
ply noise is (assuming the filter capacitor is much larger
than the photodiode capacitance):
If the amount of tolerable noise is known, then the filter
capacitor can be easily selected:
For example, with maximum noise voltage = 100mVp-p,
CPHOTO = 0.5pF, RFILT = 1k
, and INOISE selected to
be 5nA (1/10 of MAX3664 input-referred noise):
Step 4: Designing a Low-Capacitance Input
Noise performance and bandwidth are adversely
affected by stray capacitance on the input node.
Select a low-capacitance photodiode and use good
high-frequency design and layout techniques to mini-
mize capacitance on this pin. The MAX3664 is
optimized for 0.5pF of capacitance on the input—
approximately the capacitance of a photodetector
diode sharing a common header with the MAX3664 in
die form.
Photodiode capacitance changes significantly with bias
voltage. With a 3.3V supply voltage, the reverse voltage
on the PIN diode is only 2.5V. If a higher voltage supply
is available, apply it to the diode to significantly reduce
capacitance.
Take great care to reduce input capacitance. With the
SO and MAX versions of the MAX3664, the package
capacitance is about 0.3pF, and the PC board between
the MAX3664 input and the photodiode can add para-
sitic capacitance. Keep the input line short, and remove
power and ground planes beneath it. Packaging the
MAX3664 into a header with the photodiode provides
the best possible performance. It reduces parasitic
capacitance to a minimum, resulting in the lowest noise
and the best bandwidth.
MAX3664
C1
5pF
15.5nF
RL
100
a) SIMPLE, 1-POLE, 530MHz FILTER
60
60
MAX3664
1.2pF
7.3pF
RL
100
b) 3-POLE, 470MHz BESSEL FILTER
60
60
Figure 3. Filter Design Examples
I
V
C
R
C
NOISE
PHOTO
FILT
FILTER
= (
)(
)
(
)(
)
C
=
V
FILT
NOISE
(
)(
)
(
)(
)
C
R
I
PHOTO
FILT
NOISE
C
= 0.1
FILT
( )
(
) (
)
(
)
[
]=
0 5
12
1000 5
9
10
.
/
E
nF
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| MAX3664EUA | 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 |
| MAX3664EUA+T | 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 |
| MAX3664EUA-T | 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 |
| MAX3664EVKIT-SO | 功能描述:放大器 IC 開發(fā)工具 RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類型:Power Amplifiers 工具用于評(píng)估:IR4302 工作電源電壓:13 V to 23 V |
| MAX3665E/D | 制造商:Maxim Integrated Products 功能描述:622MBPS, ULTRA-LOW-POWER, 3.3V TRANSIMPEDANCE - Gel-pak, waffle pack, wafer, diced wafer on film 制造商:Maxim Integrated Products 功能描述:622MBPS ULTRA-LOW-POWER 3.3V TRANSIMPEDA |
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