MAX3645 View Datasheet(PDF) - Maxim Integrated

Part Name

Description

Manufacturer

MAX3645

+2.97V to +5.5V, 125Mbps to 200Mbps Limiting Amplifier with Loss-of-Signal Detector

Maxim Integrated 

+2.97V to +5.5V, 125Mbps to 200Mbps Limiting

Amplifier with Loss-of-Signal Detector

ELECTRICAL CHARACTERISTICS (continued)

(VCC = +2.97V to +5.5V, PECL outputs are terminated with 50Ω to VCC - 2V, RTH = 100Ω, CAZ = 0.1µF, CSD = 1nF, TA = -40°C to

+85°C. Typical values are at VCC = +3.3V, TA = +25°C, unless otherwise noted.)

PARAMETER

SYMBOL

CONDITIONS

TRANSFER CHARACTERISTICS

Bandwidth

Gain = 60dB

Low-Frequency Cutoff

CAZ = open

CAZ = 0.1µF

LOSS-OF-SIGNAL SPECIFICATIONS (Notes 2, 4, 6)

LOS Sensitivity Range

0Ω ≤ RTH ≤ 2kΩ

LOS Hysteresis

LOS Assert/Deassert Time

10log (VDEASSERT/VASSERT)

(Note 7)

LOS Assert Level

RTH = 0Ω, low setting

RTH = 1kΩ, medium setting

LOS Deassert Level

Signal-Dectect Filter Resistance

RTH = 2kΩ, high setting

RTH = 0Ω, low setting

RTH = 1kΩ, medium setting

RTH = 2kΩ, high setting

RSD

Pin 7

MIN TYP MAX UNITS

150 250

500

0.5

MHz

kHz

2

20

mVP-P

1.4

2

dB

2.3

80.0

µs

0.5

0.9

1.3

4.8

6.6

8.3 mVP-P

12

17

22

1.1

1.5

1.9

8.0

10.8 13.5 mVP-P

20

28

36

14

20

26

kΩ

Note 1: Between sensitivity and overload, the output amplitude is >95% of the fully limited amplitude and all AC specifications are met.

Note 2: Guaranteed by design and characterization.

Note 3: Noise is derived from BER measurement.

Note 4: The data input transition time is controlled by a 4th-order Bessel filter with f-3dB = 0.75 × data rate.

Note 5: PWD = [(width of wider pulse) - (width of narrower pulse)] / 2, measured with 155Mbps 0011 pattern.

Note 6: All LOS specifications are measured using a 155Mbps 223 - 1 PRBS pattern.

Note 7: The signal at the input is switched between two amplitudes, SIGNAL_ON and SIGNAL_OFF, as shown in Figure 1.

VIN

1dB

SIGNAL ON

MAXIMUM DEASSERT LEVEL

6dB

MAXIMUM POWER-DETECT WINDOW

MINIMUM ASSERT LEVEL

SIGNAL OFF

0V

TIME

Figure 1. Signal Levels for LOS Assert/Deassert Time

Measurement

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