MAX3799 Datasheet PDF - Maxim Integrated Products

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MAX3799
Maxim Integrated Products

Part Number MAX3799
Description SFP+ Multirate Limiting Amplifier And VCSEL Driver
Page 30 Pages


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19-4695; Rev 0; 8/09
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1Gbps to 14Gbps, SFP+ Multirate Limiting
Amplifier and VCSEL Driver
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)
3mVP-P Receiver Sensitivity at 10.32Gbps
4psP-P DJ at Receiver Output at 8.5Gbps 8B/10B
4psP-P DJ at Receiver Output at 10.32Gbps
231 - 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
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX3799ETJ+
-40°C to +85°C
32 TQFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Typical Application Circuit and Pin Configuration appear at
end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
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.



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1Gbps to 14Gbps, SFP+ Multirate Limiting
Amplifier and VCSEL Driver
ABSOLUTE MAXIMUM RATINGS
VCCR, VCCT, VCCD.................................................-0.3V to +4.0V
Voltage Range at DISABLE, SDA, SCL, CSEL,
RSEL, FAULT, BMON, LOS, CAZ2.........-0.3V to (VCC + 0.3V)
Voltage Range at ROUT+, ROUT- .....(VCC - 1V) to (VCC + 0.3V)
Voltage at TIN+, TIN-........................(VCC - 2.5V) to (VCC - 0.5V)
Voltage Range at TOUT+, TOUT- ......(VCC - 2V) to (VCC + 0.3V)
Voltage at BIAS ............................................................0V to VCC
Voltage at RIN+, RIN- ..........................(VCC - 2V) to (VCC - 0.2V)
Current Range into FAULT, LOS...........................-1mA to +5mA
Current Range into SDA........................................-1mA to +1mA
Current into ROUT+, ROUT- ...............................................40mA
Current into TOUT+, TOUT- ................................................60mA
Continuous Power Dissipation (TA = +70°C)
32-Pin TQFN (derate 34.5W/°C above +70°C) ...........2759mW
Operating Junction Temperature Range ...........-55°C to +150°C
Storage Temperature Range .............................-65°C to +160°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VCC = 2.85V to 3.63V, TA = -40°C to +85°C, CML receiver output load is AC-coupled to differential 100Ω, CAZ = 1nF, transmitter out-
put load is AC-coupled to differential 100Ω (see Figure 1), typical values are at +25°C, VCC = 3.3V, IBIAS = 6mA, IMOD = 6mA, unless
otherwise specified. Registers are set to default values unless otherwise noted, and the 3-wire interface is static during measure-
ments. For testing, the RATE_SEL bit was used and the RSEL pin was left open.)
PARAMETER
POWER SUPPLY
Power-Supply Current
Power-Supply Voltage
GENERAL
Input Data Rate
Input/Output SNR
BER
POWER-ON RESET
High POR Threshold
Low POR Threshold
Rx INPUT SPECIFICATIONS
Differential Input Resistance
RIN+/RIN-
Input Sensitivity (Note 2)
Input Overload
Input Return Loss
Input Return Loss
Rx OUTPUT SPECIFICATIONS
Differential Output Resistance
SYMBOL
CONDITIONS
Includes the CML output current;
ICC excludes IBIAS = 6mA, IMOD = 6mA,
VDIFF_ROUT = 400mVP-P (Note 1)
VCC
IBIAS = IBIASOFF and IMOD = IMODOFF
RIN_DIFF
VINMIN
VINMAX
SDD11
SCC11
RATE_SEL = 0 (1.25Gbps)
RATE_SEL = 1 (10.32Gbps)
DUT is powered on, f  5GHz
DUT is powered on, f  16GHz
DUT is powered on, 1GHz < f  5GHz
DUT is powered on, 1GHz < f  16GHz
ROUTDIFF
MIN TYP MAX UNITS
97 150 mA
2.85
3.63
V
1.0625
14.1
10.32 Gbps
10E-12
2.55 2.75
2.3 2.45
V
V
75 100 125

1
3
1.2
14
7
8
8
3
mVP-P
8
VP-P
dB
dB
75 100 125

2 _______________________________________________________________________________________



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1Gbps to 14Gbps, SFP+ Multirate Limiting
Amplifier and VCSEL Driver
ELECTRICAL CHARACTERISTICS (continued)
(VCC = 2.85V to 3.63V, TA = -40°C to +85°C, CML receiver output load is AC-coupled to differential 100Ω, CAZ = 1nF, transmitter out-
put load is AC-coupled to differential 100Ω (see Figure 1), typical values are at +25°C, VCC = 3.3V, IBIAS = 6mA, IMOD = 6mA, unless
otherwise specified. Registers are set to default values unless otherwise noted, and the 3-wire interface is static during measure-
ments. For testing, the RATE_SEL bit was used and the RSEL pin was left open.)
PARAMETER
Output Return Loss
SYMBOL
SDD22
Output Return Loss
CML Differential Output Voltage
High
CML Differential Output Voltage
Medium
CML Differential Output DAC
Limit
Differential Output Signal When
Disabled
SCC22
Data Output Transition Time
(20% to 80%)
(Notes 2, 3, 4)
tR/tF
Rx TRANSFER CHARACTERISTICS
Deterministic Jitter
(Notes 2, 3, 5)
DJ
Random Jitter (Notes 2, 3)
Low-Frequency Cutoff
Rx LOS SPECIFICATIONS
LOS Assert Sensitivity Range
LOS Hysteresis
LOS Assert/Deassert Time
Low Assert Level
Low Deassert Level
Medium Assert Level
Medium Deassert Level
High Assert Level
High Deassert Level
RJ
CONDITIONS
DUT is powered on, f  5GHz
DUT is powered on, f  16GHz
DUT is powered on, 1GHz < f  5GHz
DUT is powered on, 1GHz < f  16GHz
5mVP-P  VIN  1200mVP-P, SET_CML[162]
10mVP-P  VIN  1200mVP-P, SET_CML[80]
SET_CML[7:0]
Outputs AC-coupled, VINMAX applied to
input VDIFF_ROUT = 800mVP-P at 8.5Gbps
(Notes 2, 3)
10mVP-P  VIN  1200mVP-P,
RATE_SEL = 1, VDIFF_ROUT = 400mVP-P
5mVP-P  VIN  1200mVP-P,
RATE_SEL = 0, VDIFF_ROUT = 800mVP-P
60mVP-P  VIN  400mVP-P at 10.32Gbps,
RATE_SEL = 1, VDIFF_ROUT = 400mVP-P
10mVP-P  VIN  1200mVP-P at 8.5Gbps,
RATE _SEL = 1, VDIFF_ROUT = 400mVP-P
5mVP-P  VIN  1200mVP-P at 1.25Gbps,
RATE _SEL = 0, VDIFF_ROUT = 800mVP-P
Input = 60mVP-P at 1.25Gbps,
RATE_SEL = 0, VDIFF_ROUT = 800mVP-P
Input = 60mVP-P at 8.5Gbps,
RATE _SEL = 1, VDIFF_ROUT = 400mVP-P
CAZ = 0.1μF
CAZ = open
10 x log (VDEASSERT/VASSERT) (Note 6)
(Note 7)
SET_LOS[7] (Notes 2, 6)
SET_LOS[7] (Notes 2, 6)
SET_LOS[32] (Notes 2, 6)
SET_LOS[32] (Notes 2, 6)
SET_LOS[63] (Notes 2, 6)
SET_LOS[63] (Notes 2, 6)
MIN
595
300
14
1.25
2.3
8
14
39
65
77
127
TYP
11
5
9
7
800
400
6
26
60
4
4
20
1.8
0.32
2
500
2.1
11
18
48
81
94
158
MAX
UNITS
dB
dB
1005 mVP-P
515 mVP-P
215
15 mVP-P
35
ps
100
12
12 psP-P
2.5
0.48
psRMS
kHz
77 mVP-P
dB
80 μs
14 mVP-P
21 mVP-P
58 mVP-P
95 mVP-P
112 mVP-P
182 mVP-P
_______________________________________________________________________________________ 3



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1Gbps to 14Gbps, SFP+ Multirate Limiting
Amplifier and VCSEL Driver
ELECTRICAL CHARACTERISTICS (continued)
(VCC = 2.85V to 3.63V, TA = -40°C to +85°C, CML receiver output load is AC-coupled to differential 100Ω, CAZ = 1nF, transmitter out-
put load is AC-coupled to differential 100Ω (see Figure 1), typical values are at +25°C, VCC = 3.3V, IBIAS = 6mA, IMOD = 6mA, unless
otherwise specified. Registers are set to default values unless otherwise noted, and the 3-wire interface is static during measure-
ments. For testing, the RATE_SEL bit was used and the RSEL pin was left open.)
PARAMETER
Tx INPUT SPECIFICATIONS
Differential Input Voltage
Common-Mode Input Voltage
Differential Input Resistance
Input Return Loss
Input Return Loss
Tx LASER MODULATOR
Maximum Modulation-On
Current into 100 Differential
Load
Minimum Modulation-On Current
into 100 Differential Load
Modulation Current DAC
Stability
Modulation Current Rise Time/
Fall Time
Deterministic Jitter (Notes 2, 9)
Random Jitter
Output Return Loss
Tx BIAS GENERATOR
Maximum Bias-On Current
Minimum Bias-On Current
SYMBOL
CONDITIONS
VIN
VINCM
RIN
SDD11
SCC11
Data rate = 1.0625Gbps
Data rate = 10.32Gbps
DUT is powered on, f  5GHz
DUT is powered on, f  16GHz
DUT is powered on, 1GHz < f  5GHz
DUT is powered on, 1GHz < f  16GHz
IMODMAX Outputs AC-coupled, VCCTO  2.95V
IMODMIN Outputs AC-coupled
tR/tF
DJ
SDD22
2mA  IMOD  12mA (Note 8)
5mA  IMOD  10mA, 20% to 80%,
SET_TXDE[3:0] = 10 (Notes 2, 4)
5mA  IMOD  12mA, at 10.32Gbps,
250mVP-P  VIN  800mVP-P,
SET_TXDE[4:1] = 0
5mA  IMOD  12mA, at 10.32Gbps,
250mVP-P  VIN  800mVP-P,
SET_TXDE[4:1] = 10
5mA  IMOD  12mA, at 8.5Gbps,
250mVP-P  VIN  800mVP-P,
SET_TXDE[4:1] = 0
5mA  IMOD  12mA, at 8.5Gbps,
250mVP-P  VIN  800mVP-P,
SET_TXDE[4:1] = 10
2mA  IMOD  12mA, at 4.25Gbps
2mA  IMOD  12mA, at 1.0625Gbps
5mA  IMOD  12mA, 250mVP-P  VIN 
800mVP-P
DUT is powered on, f  5GHz
DUT is powered on, f  16GHz
IBIASMAX Current into BIAS pin
IBIASMIN Current into BIAS pin
MIN TYP MAX UNITS
0.2
0.075
75
2.75
100
15
6
9
5
2.4
0.8
125
VP-P
V

dB
dB
12 mA
2 mA
4%
26 39
ps
6 12
6 13
6 12 ps
6
5
5
0.17
12
5
12
0.5 psRMS
dB
15 mA
2 mA
4 _______________________________________________________________________________________



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