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General Description

The MAX3798 is a highly integrated limiting amplifier

and VCSEL driver designed for 1x/2x/4x/8x Fibre

Channel transmission systems at data rates up to

8.5Gbps as well as for 10GBASE-SR transmission sys-

tems at a data rate of 10.3125Gbps. Operating from a

single +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 (mode selection,

LOS threshold, LOS squelch, LOS polarity, CML output

level, signal path polarity, slew-rate control, deempha-

sis, and fast mode-select change time) and Tx settings

(modulation current, bias current, polarity, programma-

ble deemphasis, eye-crossing adjustment, and eye

safety control) without the need for external compo-

nents. The MAX3798 provides multiple current and volt-

age DACs to allow the use of low-cost controller ICs.

The MAX3798 is packaged in a lead-free, 5mm x 5mm,

32-pin TQFN package.

Applications

10GBASE-SR SFP+ Optical Transceiver

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

(FC) Optical Transceiver

10GBASE-LR SFP+ Optical Transceiver (1310nm

VCSEL)

10GBASE-LRM SFP+ Optical Transceiver

(1310nm VCSEL)

Features

♦ Low Power Dissipation of 320mW at 3.3V Power

Supply

♦ Up to 10.32Gbps (NRZ) Operation

♦ 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

♦ Mode Select for High-Gain Mode and High-

Bandwidth Mode

♦ CML Output Slew-Rate Adjustment for High-Gain

Mode

♦ CML Output with Continuous Level Adjustment

♦ 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

♦ Selectable Deemphasis at Rx Output

♦ 3-Wire Digital Interface

♦ Eye-Crossing Adjustment of Modulation Output

♦ Programmable Deemphasis at Tx Output

♦ Fast Mode-Select Change Time of 10µs

MAX3798

1.0625Gbps to 10.32Gbps, Integrated, Low-

Power SFP+ Limiting Amplifier and VCSEL Driver

________________________________________________________________

Maxim Integrated Products

Ordering Information

19-4360; Rev 0; 10/08

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.

Denotes a lead-free/RoHS-compliant package.

EP = Exposed pad.

PART TEMP RANGE PIN-PACKAGE

MAX3798ETJ+ -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

Sommario

Pagina 1 - Ordering Information

General DescriptionThe MAX3798 is a highly integrated limiting amplifierand VCSEL driver designed for 1x/2x/4x/8x FibreChannel transmission systems at

Pagina 2 - ELECTRICAL CHARACTERISTICS

MAX37981.0625Gbps to 10.32Gbps, Integrated, Low-Power SFP+ Limiting Amplifier and VCSEL Driver10 _____________________________________________________

Pagina 3

MAX37981.0625Gbps to 10.32Gbps, Integrated, Low-Power SFP+ Limiting Amplifier and VCSEL Driver________________________________________________________

Pagina 4

MAX37981.0625Gbps to 10.32Gbps, Integrated, Low-Power SFP+ Limiting Amplifier and VCSEL Driver12 _____________________________________________________

Pagina 5

MAX37981.0625Gbps to 10.32Gbps, Integrated, Low-Power SFP+ Limiting Amplifier and VCSEL Driver________________________________________________________

Pagina 6

MAX3798Detail DescriptionThe MAX3798 SFP+ transceiver combines a limitingamplifier receiver with loss-of-signal detection and aVCSEL laser driver tran

Pagina 7

MAX37981.0625Gbps to 10.32Gbps, Integrated, Low-Power SFP+ Limiting Amplifier and VCSEL Driver________________________________________________________

Pagina 8

MAX37981.0625Gbps to 10.32Gbps, Integrated, Low-Power SFP+ Limiting Amplifier and VCSEL Driver16 _____________________________________________________

Pagina 9

controls the output eye-crossing adjustment. A statusindicator bit (TXED) monitors the presence of an ACinput signal.Bias Current DACThe bias current

Pagina 10

MAX37981.0625Gbps to 10.32Gbps, Integrated, Low-Power SFP+ Limiting Amplifier and VCSEL Driver18 _____________________________________________________

Pagina 11

MAX37981.0625Gbps to 10.32Gbps, Integrated, Low-Power SFP+ Limiting Amplifier and VCSEL Driver________________________________________________________

Pagina 12

MAX37981.0625Gbps to 10.32Gbps, Integrated, Low-Power SFP+ Limiting Amplifier and VCSEL Driver2 ______________________________________________________

Pagina 13 - Pin Description

MAX37983-Wire Digital CommunicationThe MAX3798 implements a proprietary 3-wire digitalinterface. An external controller generates the clock. The3-wire

Pagina 14 - Pin Description (continued)

MAX37981.0625Gbps to 10.32Gbps, Integrated, Low-Power SFP+ Limiting Amplifier and VCSEL Driver________________________________________________________

Pagina 15 - Figure 2. Functional Diagram

MAX3798Register DescriptionsReceiver Control Register 1 (RXCTRL1)Bit 3: CAZX. When CAZX is set to 0, no external capacitor is required (CAZ1 and CAZ2)

Pagina 16 - Output Stage

MAX37981.0625Gbps to 10.32Gbps, Integrated, Low-Power SFP+ Limiting Amplifier and VCSEL Driver________________________________________________________

Pagina 17

MAX3798Transmitter Control Register (TXCTRL)Bit 3: TXDE_EN. Enables or disables the transmit output deemphasis circuitry.0 = disabled1 = enabledBit 2:

Pagina 18

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

Pagina 19

MAX3798Modulation 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

Pagina 20 - 3-Wire Digital Communication

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

Pagina 21

MAX3798impromptu deemphasis adjustment, it is recommendedthat the DE_INC (MODINC[5]) bit is used. Use of this bitincrements or decrements the deemphas

Pagina 22 - Register Descriptions

MAX37981.0625Gbps to 10.32Gbps, Integrated, Low-Power SFP+ Limiting Amplifier and VCSEL Driver________________________________________________________

Pagina 23

MAX37981.0625Gbps to 10.32Gbps, Integrated, Low-Power SFP+ Limiting Amplifier and VCSEL Driver________________________________________________________

Pagina 24

MAX37981.0625Gbps to 10.32Gbps, Integrated, Low-Power SFP+ Limiting Amplifier and VCSEL Driver30 _____________________________________________________

Pagina 25 - Programming Bias Current

MAX37981.0625Gbps to 10.32Gbps, Integrated, Low-Power SFP+ Limiting Amplifier and VCSEL Driver________________________________________________________

Pagina 26

MAX37981.0625Gbps to 10.32Gbps, Integrated, Low-Power SFP+ Limiting Amplifier and VCSEL Driver32 _____________________________________________________

Pagina 27 - Design Procedure

MAX37981.0625Gbps to 10.32Gbps, Integrated, Low-Power SFP+ Limiting Amplifier and VCSEL Driver________________________________________________________

Pagina 28 - Applications Information

MAX37981.0625Gbps to 10.32Gbps, Integrated, Low-Power SFP+ Limiting Amplifier and VCSEL Driver34 _____________________________________________________

Pagina 29 - Table 7. Register Summary

MAX37981.0625Gbps to 10.32Gbps, Integrated, Low-Power SFP+ Limiting Amplifier and VCSEL DriverMaxim cannot assume responsibility for use of any circui

Pagina 30

MAX37981.0625Gbps to 10.32Gbps, Integrated, Low-Power SFP+ Limiting Amplifier and VCSEL Driver4 ______________________________________________________

Pagina 31

MAX37981.0625Gbps to 10.32Gbps, Integrated, Low-Power SFP+ Limiting Amplifier and VCSEL Driver________________________________________________________

Pagina 32

MAX37981.0625Gbps to 10.32Gbps, Integrated, Low-Power SFP+ Limiting Amplifier and VCSEL Driver6 ______________________________________________________

Pagina 33

MAX37981.0625Gbps to 10.32Gbps, Integrated, Low-Power SFP+ Limiting Amplifier and VCSEL Driver________________________________________________________

Pagina 34 - Typical Application Circuit

MAX37981.0625Gbps to 10.32Gbps, Integrated, Low-Power SFP+ Limiting Amplifier and VCSEL Driver8 ______________________________________________________

Pagina 35 - Package Information

MAX37981.0625Gbps to 10.32Gbps, Integrated, Low-Power SFP+ Limiting Amplifier and VCSEL Driver________________________________________________________

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