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鍙冩暩(sh霉)璩囨枡
| 鍨嬭櫉锛� | MAX3645EEE+T |
| 寤犲晢锛� | Maxim Integrated Products |
| 鏂囦欢闋佹暩(sh霉)锛� | 8/10闋� |
| 鏂囦欢澶�?銆�?/td> | 0K |
| 鎻忚堪锛� | IC AMP LIMITING 16-QSOP |
| 鐢�(ch菐n)鍝佸煿瑷撴ā濉婏細 | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 妯欐簴鍖呰锛� | 2,500 |
| 椤炲瀷锛� | 闄愬箙鏀惧ぇ鍣� |
| 鎳�(y墨ng)鐢細 | 鏁�(sh霉)鎿�(j霉)閲忓寲鍣紝鍏夊鎺ユ敹鍣� |
| 瀹夎椤炲瀷锛� | 琛ㄩ潰璨艰 |
| 灏佽/澶栨锛� | 16-SSOP锛�0.154"锛�3.90mm 瀵級 |
| 渚涙噳(y墨ng)鍟嗚ō(sh猫)鍌欏皝瑁濓細 | 16-QSOP |
| 鍖呰锛� | 甯跺嵎 (TR) |
The external autozero capacitor (CAZ), in parallel with
internal capacitance (CINT), determines the time con-
stant of the DC offset correction loop. With CAZ = 0.1F
(recommended), the -3dB frequency cutoff of the signal
path is typically 0.5kHz.
Power Detector and LOS Indicators
The external resistor RTH sets the gain of the first limit-
ing stage. This gain setting controls the threshold at
which the power detector indicates an LOS condition.
Power detection is accomplished by rectifying and low-
pass filtering the data signal, then comparing it to the
programmed threshold voltage. A hysteresis of 2dB
prevents the LOS output from chattering when the input
signal is near the threshold.
PECL Output Buffer
The data outputs (DOUT+, DOUT-) and the loss-of-sig-
nal outputs (LOS+, LOS-) are PECL outputs. The equiv-
alent PECL output circuit is shown in Figure 4.
Applications Information
Programming LOS Assert/Deassert Levels
The appropriate value of RTH is determined by using
the Loss-Of-Signal Threshold vs. RTH graph in the
Typical Operating Characteristics.
LOS Time Constant
The lowpass filter of the power detector comprises a
20k
on-chip resistor (RSD) and an external capacitor
(CSD). The CSD capacitor value determines the power-
detector time constant, which determines the LOS
assert/deassert time. With CSD = 1nF the assert/
deassert time is in the range of 2.3s to 80s. This pro-
vides a long enough time constant to avoid false trig-
gering due to variations in mark density.
Disable Function
When the DIS input is forced high, the disable function
is enabled, which holds DOUT+ low and DOUT- high.
The disable function is used to prevent the data outputs
from toggling due to noise when no signal is present.
The LOS output can be connected to the DIS input for
automatic squelch.
PECL Output Terminations
The proper termination for a PECL output is 50
to
(VCC - 2V), but other standard termination techniques
can be used. For more information on PECL termina-
tions and how to interface with other logic families, refer
to Maxim Application Note HFAN-01.0: Introduction to
LVDS, PECL, and CML.
Layout Considerations
For best performance, use good high-frequency layout
techniques. Filter power supplies, keep ground con-
nections short, and use multiple vias where possible.
Power-supply decoupling should be placed close to
the VCC pins. Minimize the distance from the preampli-
fier and use controlled-impedance transmission lines to
interface with the outputs when possible.
MAX3645
+2.97V to +5.5V, 125Mbps to 200Mbps Limiting
Amplifier with Loss-of-Signal Detector
_______________________________________________________________________________________
7
MAX3645
DIN+
DIN-
DOUT+
DOUT-
LOS
POWER
DETECTOR
CSD
OFFSET
CORRECTION
CINT
CAZ1
CAZ2
TH
DIS
LOS
Figure 2. Functional Diagram
DIN+
DIN-
VCC
ESD
STRUCTURES
VCC - 0.87V
4.8k
4.8k
Figure 3. Equivalent Data Input Circuit
鐩搁棞(gu膩n)PDF璩囨枡 |
PDF鎻忚堪 |
|---|---|
| MAX3654ETE+T | IC AMP TRANSIMPEDANCE 16-TQFN |
| MAX3658AETA+T | IC AMP TRANSIMPEDANCE 8-TDFN |
| MAX3660ETE+T | IC TRANSIMPEDANCE AMP 16TQFN-EP |
| MAX3664ESA+T | IC PREAMP 622MBPS ULP 3.3V 8SOIC |
| MAX3665EUA+T | IC PREAMP 622MBPS TRANS 8-UMAX |
鐩搁棞(gu膩n)浠ｇ悊鍟�/鎶€琛�(sh霉)鍙冩暩(sh霉) |
鍙冩暩(sh霉)鎻忚堪 |
|---|---|
| MAX3645ESE | 鍔熻兘鎻忚堪:闄愬箙鏀惧ぇ鍣� RoHS:鍚� 鍒堕€犲晢:Micrel 杓稿叆闆诲鑼冨湇锛堟渶澶у€硷級:3.6 V 宸ヤ綔闆绘簮闆诲:3.3 V 闆绘簮闆绘祦:40 mA 宸ヤ綔婧害鑼冨湇:- 40 C to + 85 C 灏佽 / 绠遍珨:MSOP-10 灏佽:Tube |
| MAX3645ESE+ | 鍔熻兘鎻忚堪:闄愬箙鏀惧ぇ鍣� RoHS:鍚� 鍒堕€犲晢:Micrel 杓稿叆闆诲鑼冨湇锛堟渶澶у€硷級:3.6 V 宸ヤ綔闆绘簮闆诲:3.3 V 闆绘簮闆绘祦:40 mA 宸ヤ綔婧害鑼冨湇:- 40 C to + 85 C 灏佽 / 绠遍珨:MSOP-10 灏佽:Tube |
| MAX3645ESE+T | 鍔熻兘鎻忚堪:闄愬箙鏀惧ぇ鍣� RoHS:鍚� 鍒堕€犲晢:Micrel 杓稿叆闆诲鑼冨湇锛堟渶澶у€硷級:3.6 V 宸ヤ綔闆绘簮闆诲:3.3 V 闆绘簮闆绘祦:40 mA 宸ヤ綔婧害鑼冨湇:- 40 C to + 85 C 灏佽 / 绠遍珨:MSOP-10 灏佽:Tube |
| MAX3645ESEEVKIT | 鍔熻兘鎻忚堪:闄愬箙鏀惧ぇ鍣� +2.97V to +5.5V 125Mbps to 200Mbps Limiting Amplifier with Loss-of-Signal Detector RoHS:鍚� 鍒堕€犲晢:Micrel 杓稿叆闆诲鑼冨湇锛堟渶澶у€硷級:3.6 V 宸ヤ綔闆绘簮闆诲:3.3 V 闆绘簮闆绘祦:40 mA 宸ヤ綔婧害鑼冨湇:- 40 C to + 85 C 灏佽 / 绠遍珨:MSOP-10 灏佽:Tube |
| MAX3645ESE-T | 鍔熻兘鎻忚堪:闄愬箙鏀惧ぇ鍣� RoHS:鍚� 鍒堕€犲晢:Micrel 杓稿叆闆诲鑼冨湇锛堟渶澶у€硷級:3.6 V 宸ヤ綔闆绘簮闆诲:3.3 V 闆绘簮闆绘祦:40 mA 宸ヤ綔婧害鑼冨湇:- 40 C to + 85 C 灏佽 / 绠遍珨:MSOP-10 灏佽:Tube |
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