Datasheet > MAX3747B

MAX3747B

更新时间： 2023-12-20 18:45:05

品牌	Logo	应用领域
亚德诺 - ADI		放大器
页数	文件大小	规格书
11页	332K
描述
155Mbps至3.2Gbps、低功耗SFP限幅放大器

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MAX3747B 数据手册

MAX3747A/MAX3747B

155Mbps to 3.2Gbps, Low-Power SFP

Limiting Amplifiers

Loss-of-Signal Indicator

Applications Information

Program the LOS Assert Threshold

Program the LOS assert threshold according to Figure

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

5. The combination of R

and R

should be

TH2

TH1

greater than or equal to 5kΩ, see the Assert/Deassert

vs. V graph in the Typical Operating Characteristics.

from the TH pin to V

and the other connecting from TH

(Figure 5). An RMS power detector compares

to V

REF

Select the Coupling Capacitor

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.

When AC-coupling is desired, coupling capacitors C

and C

should be selected to minimize the receiv-

OUT

er’s deterministic jitter. Jitter is decreased as the input

low-frequency cutoff (f ) is decreased:

= 1/[2π(50)(C )]

For all applications, the recommended value for C

and C

is 0.1µF, which provides f equal to 32kHz.

OUT

Refer to Application Note HFAN-1.1: Choosing AC-

Coupling Capacitors on the Maxim website

(www.maximintegrated.com).

TH2

TH1

REF

= (R x (V - V )) / (R + R

)

TH2

REF

TH1

TH2

IS V REFERENCED

TH1

+ R ≥ 5kΩ

TH2

Figure 5. MAX3747A/MAX3747B LOS Threshold Circuit

LOS

ESD

STRUCTURE

*100kΩ PULLUP (MAX3747B ONLY)

Figure 6. MAX3747A/MAX3747B LOS Output Circuit

Maxim Integrated

1...6 7 8910 11

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