Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsLinear ICsLinear IC - Custom amplification Limiting amplifier uMAX 10

19-0281; Rev 2; 8/12

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155Mbps to 3.2Gbps, Low-Power SFP

Limiting Amplifiers

EVALUATION KIT AVAILABLE

MAX3747A/MAX3747B

Typical Application Circuit

General Description

The MAX3747A/MAX3747B multirate limiting amplifiers

function as data quantizers for OC-3 through OC-48 syn-

chronous optical network (SONET), Fibre-Channel, and

Gigabit Ethernet optical receivers. They are pin-for-pin

compatible with the SY88993V from Micrel

Semiconductor, Inc. The amplifiers accept a wide range

of input voltages and provide constant-level, current-

mode logic (CML) output voltages with controlled edge

speeds. The MAX3747A/MAX3747B output voltages are

800mV

P-P

. The MAX3747B has enhanced LOS operation

under overload conditions.

The MAX3747A/MAX3747B limiting amplifiers feature a

programmable loss-of-signal detect (LOS) and an

optional disable function (DISABLE) that can be com-

bined to implement squelch.

The MAX3747A/MAX3747B are available in a 3mm, 10-

pin µMAX® package ideal for small form-

factor receivers.

Applications

Gigabit Ethernet SFP/SFF Optical Transceiver Modules

1G/2G Fibre-Channel SFP/SFF Optical Transceiver

Modules

Multirate OC-3 to OC-48 FEC SFP/SFF Optical

Transceiver Modules

10G LX4 Transceiver Modules

Features

o Pin Compatible with Micrel SY88993V

o 155Mbps to 3.2Gbps Operation

o > 57dB of Gain

o < 10

BER with 2mV

P-P

Input Amplitude

o 18mA Supply Current

o Chatter-Free LOS with Programmable Threshold

o Output DISABLE Function

o PECL-Compatible Inputs

Ordering Information

MAX3745

SUPPLY FILTER

MAX4004

DS1859

3-INPUT

DIAGNOSTIC

MONITOR

SFP OPTICAL RECEIVER

5-PIN TO-HEADER

HOST BOARD

HOST FILTER

SERDES

50Ω

MAX3747A

MAX3747B

REF

TH GND LOS DISABLE

IN-

IN+

OUT-

OUT+

0.1µF

50Ω 50Ω

TH1

TH2

TH1

+ R

TH2

≥ 5kΩ

CC_

HOST

LOS

4.7kΩ TO 10kΩ

PART TEMP RANGE PIN-PACKAGE

MAX3747AEUB+ -40°C to +85°C 10 µMAX

MAX3747BEUB+ -40°C to +85°C 10 µMAX

Pin Configuration appears at end of data sheet.

µMAX is a registered trademark of Maxim Integrated Products, Inc.

Denotes a lead(Pb)-free/RoHS-compliant package.

Summary of content (11 pages)

PAGE 1
EVALUATION KIT AVAILABLE MAX3747A/MAX3747B 155Mbps to 3.2Gbps, Low-Power SFP Limiting Amplifiers General Description Features The MAX3747A/MAX3747B multirate limiting amplifiers function as data quantizers for OC-3 through OC-48 synchronous optical network (SONET), Fibre-Channel, and Gigabit Ethernet optical receivers. They are pin-for-pin compatible with the SY88993V from Micrel Semiconductor, Inc.
PAGE 2
MAX3747A/MAX3747B 155Mbps to 3.2Gbps, Low-Power SFP Limiting Amplifiers ABSOLUTE MAXIMUM RATINGS Power-Supply Voltage (VCC) .................................-0.5V to +4.5V Voltage at IN+, IN- ..........................(VCC - 2.4V) to (VCC + 0.5V) Voltage at DISABLE, LOS, TH, VREF ..........-0.5V to (VCC + 0.5V) Current into LOS ...................................................-1mA to +9mA Current into VREF ..................................................................
PAGE 3
MAX3747A/MAX3747B 155Mbps to 3.2Gbps, Low-Power SFP Limiting Amplifiers ELECTRICAL CHARACTERISTICS (continued) (VCC = +2.97V to +3.63V, CML output load is 50Ω to VCC, TA = -40°C to +85°C. Typical values are at VCC = +3.3V and TA = +25°C, unless otherwise specified.) (Note 1) PARAMETER SYMBOL Input-Referred Noise CONDITIONS MIN VIN = 4mVP-P (Note 4) Low-Frequency Cutoff TYP MAX UNITS 120 150 µVRMS 6.
PAGE 4
MAX3747A/MAX3747B 155Mbps to 3.2Gbps, Low-Power SFP Limiting Amplifiers VCC ICC (SUPPLY CURRENT) IOUT (CML OUTPUT CURRENT) 50I 50I MAX3747A MAX3747B Figure 1. Power-Supply Current Measurement VIN VIN SIGNAL_ON = 1.2VP-P (OVERLOAD) SIGNAL_ON 1dB MAXIMUM DEASSERT LEVEL FOR A GIVEN VTH 6dB MAXIMUM POWER-DETECT WINDOW MAXIMUM DEASSERT LEVEL FOR A GIVEN RTH1/RTH2 RATIO 6dB MINIMUM ASSERT LEVEL FOR A GIVEN VTH 0V SIGNAL_OFF MINIMUM ASSERT LEVEL FOR A GIVEN RTH1/RTH2 RATIO TIME Figure 2A.
PAGE 5
MAX3747A/MAX3747B 155Mbps to 3.2Gbps, Low-Power SFP Limiting Amplifiers Typical Operating Characteristics (VCC = +3.3V, TA = +25°C, unless otherwise noted.) OUTPUT EYE DIAGRAM (MINIMUM INPUT) OUTPUT EYE DIAGRAM (MINIMUM INPUT) OUTPUT EYE DIAGRAM (MAXIMUM INPUT) MAX3747A/MAX3747B toc01 MAX3747A/MAX3747B toc03 MAX3747A/MAX3747B toc02 3.2Gbps, 223 - 1 PRBS, 4mVP-P 2.7Gbps, 223 - 1 PRBS, 4mVP-P 3.
PAGE 6
MAX3747A/MAX3747B 155Mbps to 3.2Gbps, Low-Power SFP Limiting Amplifiers Typical Operating Characteristics (continued) (VCC = +3.3V, TA = +25°C, unless otherwise noted.) 5 6 7 8 9 10 100 1000 MAX3747A/MAX3747B toc12 20 15 VIN = 5mVP-P 10 LOS ASSERT/DEASSERT TIMES vs. INPUT AMPLITUDE (LOW RTH1/RTH2 SETTINGS) LOS ASSERT/DEASSERT TIMES vs.
PAGE 7
MAX3747A/MAX3747B 155Mbps to 3.2Gbps, Low-Power SFP Limiting Amplifiers Pin Description NAME PIN MAX3747A/ MAX3747B FUNCTION MICREL SY8893V Disable Function Pin. The data outputs are held static when this pin is asserted high, transistor-to-transistor logic (TTL). The data outputs are enabled when this pin is held low. LOS functions remain active when outputs are disabled. For normal operation connect to GND.
PAGE 8
MAX3747A/MAX3747B 155Mbps to 3.2Gbps, Low-Power SFP Limiting Amplifiers Functional Diagram VCC MAX3747A MAX3747B 50Ω 50Ω DIGITAL OFFSET CORRECTION OUT+ OUT- IN+ IN- 50Ω DISABLE 50Ω VREF VREF SIGNAL DETECT VREF TH LOS RTH1 RTH2 RTH1 + RTH2 ≥ 5kΩ VCC CML Output Buffer The CML outputs of the MAX3747A/MAX3747B limiting amplifiers provide high tolerance to impedance mismatches and inductive connectors. The output current is approximately 16mA for the MAX3747A/MAX3747B.
PAGE 9
MAX3747A/MAX3747B 155Mbps to 3.2Gbps, Low-Power SFP Limiting Amplifiers Loss-of-Signal Indicator The MAX3747A/MAX3747B are equipped with LOS circuitry that indicates when the input signal is below a programmable threshold, set by a voltage on the TH pin (see the Typical Operating Characteristics). The voltage on the TH pin is set by two resistors, one connecting from the TH pin to VCC and the other connecting from TH to VREF (Figure 5).
PAGE 10
MAX3747A/MAX3747B 155Mbps to 3.2Gbps, Low-Power SFP Limiting Amplifiers Pin Configuration Chip Information PROCESS: SiGe Bipolar TOP VIEW + DISABLE 1 IN+ 10 VCC 2 MAX3747A MAX3747B OUT+ 8 OUT- IN- 3 VREF 4 7 LOS TH 5 6 GND µMAX 10 9 Package Information For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only.
PAGE 11
MAX3747A/MAX3747B 155Mbps to 3.2Gbps, Low-Power SFP Limiting Amplifiers Revision History REVISION NUMBER REVISION DATE 0 5/05 Initial release 1 10/07 2 8/12 Release of the MAX3747B. Removed MAX3747 from data sheet, updated Electrical Characteristics. DESCRIPTION PAGES CHANGED — 1–10 1–10 Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied.