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參數(shù)資料
| 型號： | 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)： | 7/14頁 |
| 文件大?。?/td> | 2011K |
| 代理商： | MAX3658 |
Output Buffer
The output buffer is designed to drive a 150
differen-
tial load between OUT+ and OUT-. For optimum supply
noise rejection, the MAX3658 should be terminated with
a differential load. The MAX3658 single-ended outputs
do not drive a DC-coupled grounded load. The outputs
should be AC-coupled or terminated to V
CC
. If a single-
ended output is required, both the used and the unused
outputs should be terminated in a similar manner (see
the
Interface Schematics
section).
DC Cancellation Circuit
The DC cancellation circuit uses low-frequency feed-
back to remove the DC component of the input signal
(Figure 2). This feature centers the input signal within
the transimpedance amplifier’s linear range, thereby
reducing pulse-width distortion.
The DC cancellation circuit is internally compensated
and does not require external capacitors. This circuit
minimizes pulse-width distortion for data sequences
that exhibit a 50% mark density. A mark density signifi-
cantly different from 50% causes the MAX3658 to gen-
erate pulse-width distortion. Grounding the FILT pin
disables the DC cancellation circuit. For normal opera-
tion, the DC cancellation circuit must be enabled.
The DC cancellation current is drawn from the input and
creates noise. For low-level signals with little or no DC
component, the added noise is insignificant. However,
amplifier noise increases for signals with significant DC
component (see the
Typical Operating Characteristics
).
Photocurrent Monitor
The MAX3658 includes an average photocurrent moni-
tor. The current sourced from MON to ground is approxi-
mately equal to the DC current at IN.
Design Procedure
Select Photodiode
Noise performance and bandwidth are adversely affected
by capacitance on the TIA input node. Select a low-
capacitance photodiode to minimize the total input capac-
itance on this pin. The MAX3658 is optimized for 0.5pF of
capacitance on the input. Assembling the MAX3658 in die
form using chip and wire technology provides the lowest
capacitance input and the best possible performance.
Select C
FILT
Supply voltage noise at the cathode of the photodiode
produces a current i = C
PD
dv/dt, which reduces the
receiver sensitivity (C
PD
is the photodiode capaci-
tance). The filter resistor of the MAX3658 combined
with an external capacitor, can be used to reduce the
effect of supply noise on performance (see the
Typical
Operating Circuit
). Current generated by supply noise
voltage is divided between C
FILT
and C
PD
. To obtain a
good optical sensitivity select C
FILT
≈
400pF.
Select Supply Filter
Sensitive optical receivers require wide-band power-
supply decoupling. Power-supply bypassing should
provide low impedance between V
CC
and ground for
frequencies between 10kHz and 700MHz. Isolate the
MAX3658 from noise sources with LC supply filters and
shielding. Place a supply filter (C
VCC2
) as close to the
MAX3658 as possible.
Select R
MON
If photocurrent monitoring is desired, connect a resistor
between MON and ground to monitor the average pho-
tocurrent. Select R
MON
as large as possible:
where I
MONMAX
is the largest average input current
observed. An ammeter can also monitor the current out
of the MON pin.
Select Coupling Capacitors
A receiver built with the MAX3658 will have a bandpass
frequency response. The low-frequency cutoff due to
the coupling capacitors and load resistors is:
LFC
R
C
TERM
LOAD
COUPLE
×
×
=
1
2
π
R
V
I
MON
MONMAX
.
=
2 2
M
622Mbps, Low-Noise, High-Gain
Transimpedance Preamplifier
_______________________________________________________________________________________
7
AMPLITUDE
INPUT FROM PHOTODIODE
TIME
INPUT AFTER DC CANCELLATION
Figure 2. DC Cancellation Effect on Input
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PDF描述 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX3658AE/D | 制造商:Maxim Integrated Products 功能描述:622MBPS LOW-NOISE HIGH-GAIN TRANS - Gel-pak, waffle pack, wafer, diced wafer on film |
| MAX3658AETA | 制造商:Maxim Integrated Products 功能描述:622MBPS, LOW-NOISE, HIGH-GAIN TRANSIMPEDANCE - Rail/Tube |
| MAX3658AETA+ | 制造商:Maxim Integrated Products 功能描述:SP AMP TRANSIMPEDANCE AMP SGL 8TDFN EP - Rail/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 |
| 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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