MAX3967AE/D

更新时间： 2024-02-14 21:05:49

品牌	Logo	应用领域
美信 - MAXIM		驱动器
页数	文件大小	规格书
14页	320K
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数据手册

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MAX3967AE/D 数据手册

2 7 0 Mb p s S FP LED Drive r

TX_DISABLE

CCOUT

OUT-

MAX3967

INPUT

BUFFER

5Ω

IN+

IN-

COMPLEMENTARY

OUTPUT

24X

PREBIAS

78Ω

MAIN

OUTPUT

24X

MODULATION-

CURRENT

GENERATOR

OUT+

GAIN 4X

35Ω

REFERENCE-VOLTAGE GENERATOR

12pF

1.2V

PREBIAS-CURRENT

GENERATOR

50Ω

TEMP

TCMIN

TCNOM

MODSET

MON

PB1

PB2

PB3

MODSET

Figure 2. Functional Diagram

Mo d u la t io n -Cu rre n t Ge n e ra t o r

The modulation-current generator circuit provides con-

trol of the modulation-current amplitude. This amplitude

is determined by the voltage at the MODSET pin and

P re b ia s Cu rre n t Ge n e ra t o r

A prebias voltage (V ) can be applied to the

LED to improve switching speed. The prebias current

generator creates a current that flows through the 78Ω

prebias resistor in the output stage, creating a prebias

voltage. The prebias voltage can be adjusted by selec-

PREBIAS

external resistor R

MODSET.

Do not connect bypass capacitors at the MODSET pin.

Capacitance at this pin increases high-frequency out-

put noise. The MON pin provides an optional modula-

tion-current monitor. The current sourced from the MON

pin is 1/96 of the modulation current. If used, the pin

tively connecting pins PB1, PB2, and PB3 to V . Table 1

describes the functions of PB1, PB2, and PB3.

Ou t p u t Cu rre n t Drive rs

The mod ula tion-c urre nt re fe re nc e is s witc he d a nd

amplified by the output stages.

should be connected to V through a resistor. The

resistance must be chosen so the voltage on MON

does not exceed 1.1V. If not used, leave MON open.

LED p a c ka g e le a d ind uc ta nc e c a us e s ring ing a nd

overshoot, which can be compensated with an RC filter

network. The MAX3967 includes 35Ω and 12pF of inter-

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