MAX3866 Просмотр технического описания (PDF) - Maxim Integrated

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MAX3866

2.5Gbps, +3.3V Combined Transimpedance/Limiting Amplifier

Maxim Integrated 

2.5Gbps, +3.3V Combined

Transimpedance/Limiting Amplifier

CHF+

CHF-

ICC

IN

VCCS

FIL

VCCD

GND

RF

TIA

HPF

VOLTAGE

REGULATOR

VREF

OP AMP

DATA SIGNAL PATH

MAX3866

LIM

OUT

ADJ

RMS DETECTOR

RECTIFIER

INV

PDC

CPD+

CPD-

RPD

Figure 1. Functional Diagram of the Combined Preamplifier and Limiting Postamplifier

External Filter Capacitor CPD

The LF cutoff of the power detector can be reduced by

adding external capacitance across the CPD pins. This

capacitor is only needed when this circuit is operated

at lower data rates and lower edge speeds. In this way,

the remaining ripple of power detector output voltage is

reduced.

Loss-of-Power Threshold

If the LOP function is desired, Maxim recommends RPD

= 510Ω. If the LOP function is not desired, RPD = 0Ω

(shorted). See Figure 2 for LOP definitions. If desired,

the LOP threshold can be adjusted (see Assert/

Deassert vs. RPD in the Typical Operating Charac-

teristics.

HYSTERESIS > 3dB

OUT+

OUT-

LOP

MAX. DEASSERT

DEASSERT

ASSERT

MIN. ASSERT

Figure 2. Loss-of-Power Definitions with RPD = 510Ω

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