Datasheet > MAX3864

MAX3864

更新时间： 2023-12-20 18:45:50

品牌	Logo	应用领域
亚德诺 - ADI		放大器
页数	文件大小	规格书
10页	302K
描述
2.5Gbps、+3V至+5.5V、宽动态范围互阻前置放大器

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数据手册

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MAX3864 数据手册

2.5Gbps, +3V to +5.5V, Wide Dynamic Range

Transimpedance Preamplifier

Typical Operating Characteristics (continued)

= 3.3V, T = +25°C and MAX3864 EV kit source capacitance = 0.85pF, unless otherwise noted).

DC TRANSFER FUNCTION

EYE DIAGRAM (INPUT = 2mA

)

EYE DIAGRAM (INPUT = 20μA

)

P-P

200

100

INPUT = 2 -1 PRBS

-100

-200

-100

-50

100

80ps/div

INPUT CURRENT (μA)

Pin Description

NAME

FUNCTION

Supply Voltage

No Connection

Amplifier Input

N.C.

Provides bias voltage for the photodiode through a 750Ω resistor to V . When grounded, this pin

disables the DC cancellation amplifier to allow a DC path from IN to OUT+ and OUT- for testing.

FILTER

GND

OUT-

OUT+

GND

Ground

Inverting Output. Current flowing into IN causes V

to decrease.

OUT-

Noninverting Output. Current flowing into IN causes V

Ground

to increase.

OUT+

Voltage Amplifier

Detailed Description

The voltage amplifier converts single-ended signals to

differential signals and introduces a voltage gain.

The MAX3864 transimpedance amplifier is designed for

2.5Gbps fiber optic applications. As shown in Figure 1,

the MAX3864 comprises a transimpedance amplifier, a

voltage amplifier, an output buffer, an output filter, and

a DC cancellation circuit.

Output Buffer

The output buffer provides a back-terminated voltage

output. The buffer is designed to drive a 100Ω differen-

tial load between OUT+ and OUT-. The output voltage

is divided between internal 50Ω load resistors and the

external load resistor. In the typical operating circuit,

this creates a voltage-divider with a ratio of 1/2. The

MAX3864 can also be terminated with higher output

impedances, which increases gain and output voltage

swings.

Transimpedance Amplifier

The signal current at the input flows into the summing

node of a high-gain amplifier. Shunt feedback through

R converts this current to a voltage. Schottky diodes

clamp the output voltage for large input currents

(Figure 2).

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