Rainbow-electronics MAX3798 Uživatelský manuál

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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
2
31
- 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
1
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.
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Shrnutí obsahu

Strany 1 - Ordering Information

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

Strany 2 - ELECTRICAL CHARACTERISTICS

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

Strany 3

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

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

Strany 5

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

Strany 6

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

Strany 7

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

Strany 8

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

Strany 9

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

Strany 10

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

Strany 11

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

Strany 12

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

Strany 13 - Pin Description

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

Strany 14 - Pin Description (continued)

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

Strany 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)

Strany 16 - Output Stage

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

Strany 17

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

Strany 18

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

Strany 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

Strany 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

Strany 21

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

Strany 22 - Register Descriptions

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

Strany 23

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

Strany 24

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

Strany 25 - Programming Bias Current

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

Strany 26

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

Strany 27 - Design Procedure

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

Strany 28 - Applications Information

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

Strany 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

Strany 30

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Strany 31

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

Strany 32

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

Strany 33

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

Strany 34 - Typical Application Circuit

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

Strany 35 - Package Information

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

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