MAX3799ETJ+ Maxim Integrated Products, MAX3799ETJ+ Datasheet

IC LIMITING AMP/VCSEL DVR 32TQFN

MAX3799ETJ+

Manufacturer Part Number
MAX3799ETJ+
Description
IC LIMITING AMP/VCSEL DVR 32TQFN
Manufacturer
Maxim Integrated Products
Type
Laser Diode Driverr
Datasheet

Specifications of MAX3799ETJ+

Data Rate
14Gbps
Number Of Channels
1
Voltage - Supply
2.85 V ~ 3.63 V
Current - Supply
97mA
Current - Modulation
12mA
Current - Bias
15mA
Operating Temperature
-40°C ~ 85°C
Package / Case
32-WFQFN Exposed Pad
Mounting Type
Surface Mount
Input Voltage Range (max)
4 V
Operating Supply Voltage
2.85 V to 3.63 V
Supply Current
97 mA
Operating Temperature Range
- 40 C to + 85 C
Bandwidth
400 KHz to 1000 KHz
Mounting Style
SMD/SMT
Power Dissipation
2759 mW
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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.
19-4695; Rev 1; 6/10
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.
1000BASE-SR/10GBASE-SR Multirate SFP+
Optical Transceiver
1x/2x/4x/8x/16x SFF/SFP/SFP+ MSA Fibre
Channel (FC) Optical Transceiver
1Gbps to 14Gbps, SFP+ Multirate Limiting
________________________________________________________________ Maxim Integrated Products
General Description
Applications
Amplifier and VCSEL Driver
♦ Enables Single-Module Design Compliance with
♦ -21.5dBm Optical Sensitivity at 1.25Gbps Using a
♦ Low Power Dissipation of 320mW at 3.3V Power
♦ Typical Electrical Performance of 14.025Gbps on
♦ 3mV
♦ 4ps
♦ 4ps
♦ 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
♦ Bias Current Up to 15mA
♦ Integrated Eye Safety Features
♦ 3-Wire Digital Interface
♦ Programmable Deemphasis at Tx Output
+ Denotes a lead(Pb)-free/RoHS-compliant package.
* EP = Exposed pad.
** Tested at T
Typical Application Circuit and Pin Configuration appear at
end of data sheet.
MAX3799ETJ+
MAX3799E/D
1000BASE-SR and 10GBASE-SR Specifications
10.32Gbps ROSA (-19.7dBm OMA)
Supply
Rx/Tx (Non-Retimed 16x Fibre Channel Solution)
2
Differential Load
31
PART
P-P
P-P
- 1 PRBS
P-P
DJ at Receiver Output at 8.5Gbps 8B/10B
DJ at Receiver Output at 10.32Gbps
Receiver Sensitivity at 10.32Gbps
A
= +25°C.
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
Ordering Information
PIN-PACKAGE
32 TQFN-EP*
Dice**
Features
1

Related parts for MAX3799ETJ+

MAX3799ETJ+ Summary of contents

Page 1

... Bias Current Up to 15mA ♦ Integrated Eye Safety Features ♦ 3-Wire Digital Interface ♦ Programmable Deemphasis at Tx Output Applications PART MAX3799ETJ+ MAX3799E/D + Denotes a lead(Pb)-free/RoHS-compliant package Exposed pad. ** Tested at T Typical Application Circuit and Pin Configuration appear at end of data sheet. ...

Page 2

SFP+ Multirate Limiting Amplifier and VCSEL Driver ABSOLUTE MAXIMUM RATINGS .................................................-0.3V to +4.0V CCR CCT CCD Voltage Range at DISABLE, SDA, SCL, CSEL, RSEL, FAULT, BMON, LOS, CAZ2.........-0. Voltage Range ...

Page 3

SFP+ Multirate Limiting ELECTRICAL CHARACTERISTICS (continued 2.85V to 3.63V -40°C to +85°C, CML receiver output load is AC-coupled to differential 100Ω put load is AC-coupled to differential 100Ω (see Figure ...

Page 4

SFP+ Multirate Limiting Amplifier and VCSEL Driver ELECTRICAL CHARACTERISTICS (continued 2.85V to 3.63V -40°C to +85°C, CML receiver output load is AC-coupled to differential 100Ω put load is AC-coupled to ...

Page 5

SFP+ Multirate Limiting ELECTRICAL CHARACTERISTICS (continued 2.85V to 3.63V -40°C to +85°C, CML receiver output load is AC-coupled to differential 100Ω put load is AC-coupled to differential 100Ω (see Figure ...

Page 6

SFP+ Multirate Limiting Amplifier and VCSEL Driver ELECTRICAL CHARACTERISTICS (continued 2.85V to 3.63V -40°C to +85°C, CML receiver output load is AC-coupled to differential 100Ω put load is AC-coupled to ...

Page 7

SFP+ Multirate Limiting ELECTRICAL CHARACTERISTICS (continued 2.85V to 3.63V -40°C to +85°C, CML receiver output load is AC-coupled to differential 100Ω put load is AC-coupled to differential 100Ω (see Figure ...

Page 8

SFP+ Multirate Limiting Amplifier and VCSEL Driver V CCR 4.7kΩ CONTROLLER V CCR 50Ω 0.1μF 50Ω OSCILLOSCOPE 0.1μF 50Ω 50Ω CONTROLLER V CCD 1000pF 1μ 0.1μF 0.1μF Figure 1. Test Circuit for VCSEL Driver Characterization ...

Page 9

SFP+ Multirate Limiting Typical Operating Characteristics—Limiting Amplifier (V = 3.3V +25°C, unless otherwise specified. Figure 1 shows the typical setup used for measurements. Registers are set default values unless otherwise noted, and ...

Page 10

SFP+ Multirate Limiting Amplifier and VCSEL Driver Typical Operating Characteristics—Limiting Amplifier (continued 3.3V +25°C, unless otherwise specified. Figure 1 shows the typical setup used for measurements. Registers are set default ...

Page 11

SFP+ Multirate Limiting Typical Operating Characteristics—VCSEL Driver (continued 3.3V +25°C, unless otherwise specified. Figure 1 shows the typical setup used for measurements. Registers are set default values unless otherwise noted, ...

Page 12

SFP+ Multirate Limiting Amplifier and VCSEL Driver Typical Operating Characteristics—VCSEL Driver (continued 3.3V +25°C, unless otherwise specified. Figure 1 shows the typical setup used for measurements. Registers are set default ...

Page 13

SFP+ Multirate Limiting Typical Operating Characteristics—VCSEL Driver (continued 3.3V +25°C, unless otherwise specified. Figure 1 shows the typical setup used for measurements. Registers are set default values unless otherwise noted, ...

Page 14

SFP+ Multirate Limiting Amplifier and VCSEL Driver PIN NAME 14 TIN- Inverted Transmit Data Input, CML Bias Current Monitor Output. Current out of this pin develops a ground-referenced voltage across an 16 BMON external resistor that is ...

Page 15

SFP+ Multirate Limiting AZ_EN 1G 900MHz RIN+ RIN- RSEL RATE_SEL R PULL V EER V CCD R PULL SCL 3-WIRE SDA INTERFACE CSEL R R PULL PULL BMON I BIAS BIAS BIAS MONITOR TOUT+ TOUT- EYE SAFETY ...

Page 16

SFP+ Multirate Limiting Amplifier and VCSEL Driver The limiting amplifier features a low data-rate mode (1.25Gbps) and a high data-rate mode (up to 10.32Gbps), allowing for overall system optimization. Either the RSEL pin or the RATE_SEL bit ...

Page 17

SFP+ Multirate Limiting The bias current from the MAX3799 is optimized to pro- vide up to 15mA of bias current into a 50Ω to 75Ω VCSEL load with 40μA resolution. The bias current is controlled through the ...

Page 18

SFP+ Multirate Limiting Amplifier and VCSEL Driver BIAS I MOD I BIAS I BIAS 16 BMON V CCT 8kΩ DISABLE LOSS-OF-SIGNAL CIRCUIT Figure 3. Eye Safety Circuitry 18 ______________________________________________________________________________________ V FAULT REGISTER TXSTAT1 CCT 0.72V 0.8V 1.5V ...

Page 19

SFP+ Multirate Limiting Table 3. Circuit Response to Single-Point Faults PIN NAME SHORT LOS Normal (Note 1) 2 RSEL Normal (Note Normal CCR 4 ROUT+ Normal (Note 1) 5 ROUT- Normal ...

Page 20

SFP+ Multirate Limiting Amplifier and VCSEL Driver Table 3. Circuit Response to Single-Point Faults (continued) PIN NAME SHORT Normal CCR 31 CAZ2 Normal (Note 1) CAZ1 Disabled—Fault (external supply shorted) ...

Page 21

SFP+ Multirate Limiting Table 5. Register Descriptions and Addresses ADDRESS H0x00 H0x01 H0x02 H0x03 H0x04 H0x05 H0x06 H0x07 H0x08 H0x09 H0x0A H0x0B H0x0C H0x0D H0x0E H0x0F SET_PWCTRL H0x10 WRITE MODE CSEL ...

Page 22

SFP+ Multirate Limiting Amplifier and VCSEL Driver Bit # 7 6 Name X X Default Value X X Bit 1: RATE_SEL. RATE_SEL combined with the RSEL pin through a logic-OR function selects between the low data-rate mode ...

Page 23

SFP+ Multirate Limiting Bit # 7 6 Name X X Default Value X X Bit 0: LOS. Copy of the LOS output circuitry. This is a sticky bit, which means that it is cleared on a read. ...

Page 24

SFP+ Multirate Limiting Amplifier and VCSEL Driver Bit # 7 6 Name X X Default Value X X Bit 3: TXDE_EN. Enables or disables the transmit output deemphasis circuitry disabled 1 = enabled Bit 2: ...

Page 25

SFP+ Multirate Limiting Bit 2: IBIASERR. When the bias incremented result is greater than IBIASMAX, then a SOFT FAULT is reported. See the Programming Bias Current section. Bit 1: TXED. This only indicates the absence of an ...

Page 26

SFP+ Multirate Limiting Amplifier and VCSEL Driver Bit # 7 6 SET_IMOD Name X [0] Default Value 0 0 Bit 7: SET_IMOD[0]. This is the LSB of the SET_IMOD[8:0] bits. This bit can only be updated by ...

Page 27

SFP+ Multirate Limiting Bit # 7 6 Name X X Default Value X X Bits SET_TXDE[3:0]. This is a 4-bit register used to control the amount of deemphasis on the transmitter out- put. When ...

Page 28

SFP+ Multirate Limiting Amplifier and VCSEL Driver impromptu deemphasis adjustment recommended that the DE_INC (MODINC[5]) bit is used. Use of this bit increments or decrements the deemphasis code setting by 1 LSB based on the ...

Page 29

SFP+ Multirate Limiting Table 7. Register Summary REGISTER REGISTER NORMAL FUNCTION/ NAME MODE ADDRESS Receiver Control Register 1 RXCTRL1 Address = H0x00 Receiver Control Register 2 RXCTRL2 Address = H0x01 Receiver Status Register RXSTAT Address = H0x02 ...

Page 30

SFP+ Multirate Limiting Amplifier and VCSEL Driver Table 7. Register Summary (continued) REGISTER REGISTER NORMAL FUNCTION/ NAME MODE ADDRESS Transmitter Control Register TXCTRL Address = H0x05 Transmitter Status Register 1 TXSTAT1 Address = H0x06 Transmitter Status Register ...

Page 31

SFP+ Multirate Limiting Table 7. Register Summary (continued) REGISTER REGISTER NORMAL FUNCTION/ NAME MODE ADDRESS Modulation Current Setting SET_IMOD Register Address = H0x09 Accessible through REG_ADDR = 12 Maximum Modulation Current Setting IMODMAX Register Address = H0x0A ...

Page 32

SFP+ Multirate Limiting Amplifier and VCSEL Driver Table 7. Register Summary (continued) REGISTER REGISTER NORMAL FUNCTION/ NAME MODE ADDRESS Bias Current Increment Setting BIASINC Register Address = H0x0D Mode Control Register MODECTRL Address = H0x0E Transmitter Pulse- ...

Page 33

SFP+ Multirate Limiting RIN+ RIN- TIN+ TIN- V CCT 8kΩ DISABLE V EET FAULT, LOS 376Ω CLAMP V EET Figure 5. Simplified I/O Structures ______________________________________________________________________________________ Amplifier and VCSEL Driver V CCR DEEMPHASIS CONTROL 50Ω CONTROL LOOP 50Ω ...

Page 34

SFP+ Multirate Limiting Amplifier and VCSEL Driver I MON 10G PIN FLEX ROSA R MON 10G VCSEL FLEX TOSA +3.3V VSEL 2kΩ 34 ______________________________________________________________________________________ SFP OPTICAL TRANSCEIVER +3.3V SUPPLY FILTER 1nF 0.1μF RIN+ LOS ...

Page 35

SFP+ Multirate Limiting Pin Configuration TOP VIEW CCT V 26 EER 27 V CCR 28 RIN- MAX3799 29 RIN CCR 31 CAZ2 + 32 CAZ1 1 2 ...

Page 36

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 36 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2010 Maxim Integrated Products ...

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