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參數(shù)資料
| 型號(hào)： | MAX3747EUB+T |
| 廠商： | Maxim Integrated Products |
| 文件頁(yè)數(shù)： | 11/11頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP LIMITING SFP 10-UMAX |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 類(lèi)型： | 限幅放大器 |
| 應(yīng)用： | 數(shù)據(jù)量化器，光學(xué)接收器 |
| 安裝類(lèi)型： | 表面貼裝 |
| 封裝/外殼： | 10-TFSOP，10-MSOP（0.118"，3.00mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 10-µMAX |
| 包裝： | 帶卷 (TR) |
MAX3747A/MAX3747B
155Mbps to 3.2Gbps, Low-Power SFP
Limiting Amplifiers
9
Maxim Integrated
Loss-of-Signal Indicator
The MAX3747A/MAX3747B are equipped with LOS cir-
cuitry that indicates when the input signal is below a pro-
grammable threshold, set by a voltage on the TH pin
(see the
Typical Operating Characteristics). The voltage
on the TH pin is set by two resistors, one connecting
from the TH pin to VCC and the other connecting from TH
to VREF (Figure 5). An RMS power detector compares
the input signal amplitude with this threshold and feeds
the signal-detect information to the LOS output, which is
open collector. To prevent LOS chatter in the region of
the programmed threshold, approximately 2dB of hys-
teresis is built into the LOS assert/deassert function.
Once asserted, LOS is not deasserted until the input
amplitude rises to the required level. Figure 6 shows the
LOS output circuit.
Applications Information
Program the LOS Assert Threshold
Program the LOS assert threshold according to Figure
5. The combination of RTH1 and RTH2 should be
greater than or equal to 5k
, see the Assert/Deassert
vs. VTH graph in the Typical Operating Characteristics.
Select the Coupling Capacitor
When AC-coupling is desired, coupling capacitors CIN
and COUT should be selected to minimize the receiv-
er’s deterministic jitter. Jitter is decreased as the input
low-frequency cutoff (fIN) is decreased:
fIN = 1/[2π(50)(CIN)]
For all applications, the recommended value for CIN
and COUT is 0.1F, which provides fIN equal to 32kHz.
Refer to Application Note HFAN-1.1:
Choosing AC-
Coupling Capacitors on the Maxim website
(www.maximintegrated.com)
.
TH
VREF
RTH1
RTH2
VCC
VTH = (RTH2 x (VREF - VCC)) / (RTH1 + RTH2)
VTH IS VCC REFERENCED
RTH1 + RTH2
≥ 5k
Figure 5. MAX3747A/MAX3747B LOS Threshold Circuit
ESD
STRUCTURE
VCC
LOS
*
*100k
PULLUP (MAX3747B ONLY)
Figure 6. MAX3747A/MAX3747B LOS Output Circuit
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| MAX3747EVKIT | 功能描述:放大器 IC 開(kāi)發(fā)工具 RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類(lèi)型:Power Amplifiers 工具用于評(píng)估:IR4302 工作電源電壓:13 V to 23 V |
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| MAX3748AETE | 功能描述:限幅放大器 RoHS:否 制造商:Micrel 輸入電壓范圍（最大值）:3.6 V 工作電源電壓:3.3 V 電源電流:40 mA 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:MSOP-10 封裝:Tube |
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| MAX3748AETET | 制造商:MAXIM 功能描述:New |
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