Rainbow-electronics MAX3799 User Manual download pdf

General Description

The MAX3799 is a highly integrated limiting amplifier

and VCSEL driver that operates up to 14Gbps, making

it suitable for Ethernet and Fibre Channel applications.

By providing a selectable data path with a noise-shap-

ing filter, the MAX3799 enables a module with 10G

optics to be fully compliant with both 1000BASE-SR

and 10GBASE-SR specifications. Operating from a sin-

gle +3.3V supply, this low-power integrated limiting

amplifier and VCSEL driver IC enables a platform

design for SFP MSA as well as for SFP+ MSA-based

optical transceivers. The high-sensitivity limiting ampli-

fier limits the differential input signal generated by a

transimpedance amplifier into a CML-level differential

output signal. The compact VCSEL driver provides a

modulation and a bias current for a VCSEL diode. The

optical average power is controlled by an average

power control (APC) loop implemented by a controller

that interfaces to the VCSEL driver through a 3-wire

digital interface. All differential I/Os are optimally back-

terminated for a 50Ω transmission line PCB design.

The use of a 3-wire digital interface reduces the pin

count while enabling advanced Rx (rate selection, LOS

threshold, LOS squelch, LOS polarity, CML output level,

signal path polarity, deemphasis, and fast mode-select

change time) and Tx settings (modulation current, bias

current, polarity, and eye safety control) without the

need for external components. The MAX3799 provides

multiple current and voltage DACs to allow the use of

low-cost controller ICs.

The MAX3799 is packaged in a lead-free, 5mm x 5mm,

32-pin TQFN package.

Applications

1000BASE-SR/10GBASE-SR Multirate SFP+

Optical Transceiver

1x/2x/4x/8x/16x SFF/SFP/SFP+ MSA Fibre

Channel (FC) Optical Transceiver

Features

♦ Enables Single-Module Design Compliance with

1000BASE-SR and 10GBASE-SR Specifications

♦ -21.5dBm Optical Sensitivity at 1.25Gbps Using a

10.32Gbps ROSA (-19.7dBm OMA)

♦ Low Power Dissipation of 320mW at 3.3V Power

Supply

♦ Typical Electrical Performance of 14.025Gbps on

Rx/Tx (Non-Retimed 16x Fibre Channel Solution)

♦ 3mV

P-P

Receiver Sensitivity at 10.32Gbps

♦ 4ps

P-P

DJ at Receiver Output at 8.5Gbps 8B/10B

♦ 4ps

P-P

DJ at Receiver Output at 10.32Gbps

- 1 PRBS

♦ 26ps Rise and Fall Time at Rx/Tx Output

♦ Rate Select for 1Gbps Mode or 10Gbps Mode

♦ CML Output Squelch

♦ Polarity Select for Rx and Tx

♦ LOS Assert Level Adjustment

♦ LOS Polarity Select

♦ Modulation Current Up to 12mA Into 100Ω

Differential Load

♦ Bias Current Up to 15mA

♦ Integrated Eye Safety Features

♦ 3-Wire Digital Interface

♦ Programmable Deemphasis at Tx Output

MAX3799

1Gbps to 14Gbps, SFP+ Multirate Limiting

Amplifier and VCSEL Driver

________________________________________________________________

Maxim Integrated Products

Ordering Information

19-4695; Rev 0; 8/09

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

EVALUATION KIT

AVAILABLE

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

EP = Exposed pad.

PART TEMP RANGE PIN-PACKAGE

MAX3799ETJ+ -40°C to +85°C 32 TQFN-EP*

Typical Application Circuit and Pin Configuration appear at

end of data sheet.

1 2 3 4 5 6 ... 34 35

Amplifier and VCSEL Driver 1

Summary of Contents

Page 1 - Amplifier and VCSEL Driver

General DescriptionThe MAX3799 is a highly integrated limiting amplifierand VCSEL driver that operates up to 14Gbps, makingit suitable for Ethernet an

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MAX37991Gbps to 14Gbps, SFP+ Multirate LimitingAmplifier and VCSEL Driver10 __________________________________________________________________________

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MAX37991Gbps to 14Gbps, SFP+ Multirate LimitingAmplifier and VCSEL Driver_____________________________________________________________________________

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MAX37991Gbps to 14Gbps, SFP+ Multirate LimitingAmplifier and VCSEL Driver_____________________________________________________________________________

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MAX3799Detailed DescriptionThe MAX3799 SFP+ transceiver combines a limitingamplifier receiver with loss-of-signal detection and aVCSEL laser driver tr

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MAX37991Gbps to 14Gbps, SFP+ Multirate LimitingAmplifier and VCSEL Driver_____________________________________________________________________________

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Page 9

Bias Current DACThe bias current from the MAX3799 is optimized to pro-vide up to 15mA of bias current into a 50Ω to 75ΩVCSEL load with 40μA resolution

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MAX37991Gbps to 14Gbps, SFP+ Multirate LimitingAmplifier and VCSEL Driver_____________________________________________________________________________

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MAX37991Gbps to 14Gbps, SFP+ Multirate LimitingAmplifier and VCSEL Driver2 ___________________________________________________________________________

Page 13

MAX37993-Wire Digital CommunicationThe MAX3799 implements a proprietary 3-wire digitalinterface. An external controller generates the clock. The3-wire

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MAX37991Gbps to 14Gbps, SFP+ Multirate LimitingAmplifier and VCSEL Driver_____________________________________________________________________________

Page 15

MAX3799Register DescriptionsReceiver Control Register 1 (RXCTRL1)Bit 1: RATE_SEL. RATE_SEL combined with the RSEL pin through a logic-OR function sele

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MAX37991Gbps to 14Gbps, SFP+ Multirate LimitingAmplifier and VCSEL Driver_____________________________________________________________________________

Page 17

MAX3799Transmitter Control Register (TXCTRL)Bit 3: TXDE_EN. Enables or disables the transmit output deemphasis circuitry.0 = disabled1 = enabledBit 2:

Page 18

Bit 2: IBIASERR. When the bias incremented result is greater than IBIASMAX, then a SOFT FAULT is reported. Seethe Programming Bias Currentsection.Bit

Page 19

MAX3799Modulation Current Increment Setting Register (MODINC)Bit 7: SET_IMOD[0]. This is the LSB of the SET_IMOD[8:0] bits. This bit can only be updat

Page 20

Design ProcedureProgramming Bias Current1) IBIASMAX[7:0] = Maximum_Bias_Current_Value2) SET_IBIASi[8:1] = Initial_Bias_Current_ValueNote: The total bi

Page 21

MAX3799impromptu deemphasis adjustment, it is recommendedthat the DE_INC (MODINC[5]) bit is used. Use of this bitincrements or decrements the deemphas

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MAX37991Gbps to 14Gbps, SFP+ Multirate LimitingAmplifier and VCSEL Driver_____________________________________________________________________________

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MAX37991Gbps to 14Gbps, SFP+ Multirate LimitingAmplifier and VCSEL Driver_____________________________________________________________________________

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MAX37991Gbps to 14Gbps, SFP+ Multirate LimitingAmplifier and VCSEL DriverMaxim cannot assume responsibility for use of any circuitry other than circui

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MAX37991Gbps to 14Gbps, SFP+ Multirate LimitingAmplifier and VCSEL Driver_____________________________________________________________________________

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MAX37991Gbps to 14Gbps, SFP+ Multirate LimitingAmplifier and VCSEL Driver_____________________________________________________________________________

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MAX37991Gbps to 14Gbps, SFP+ Multirate LimitingAmplifier and VCSEL Driver_____________________________________________________________________________

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Rainbow-electronics MAX3799 User Manual

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Summary of Contents

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