MAX3864(2000) データシートの表示（PDF） - Maxim Integrated

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MAX3864
(Rev.:2000)

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

Maxim Integrated 

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

Transimpedance Preamplifier

Typical Operating Characteristics (continued)

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

EYE DIAGRAM (INPUT = 2mAp-p)

INPUT = 223 -1 PRBS

EYE DIAGRAM (INPUT = 20µAp-p)

INPUT = 223 -1 PRBS

DC TRANSFER FUNCTION

200

100

0

-100

80ps/div

80ps/div

-200

-100

-50

0

50

100

INPUT CURRENT (µA)

Pin Description

PIN

NAME

FUNCTION

1

VCC

Supply Voltage

2

N.C.

No Connection

3

IN

Amplifier Input

4

FILTER

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

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

5

GND Ground

6

OUT- Inverting Output. Current flowing into IN causes VOUT- to decrease.

7

OUT+ Noninverting Output. Current flowing into IN causes VOUT+ to increase.

8

GND Ground

Detailed Description

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.

Transimpedance Amplifier

The signal current at the input flows into the summing

node of a high-gain amplifier. Shunt feedback through

RF converts this current to a voltage. Schottky diodes

clamp the output voltage for large input currents

(Figure 2).

Voltage Amplifier

The voltage amplifier converts single-ended signals to

differential signals and introduces a voltage gain.

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.

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