MAX3798ETJ+T Maxim Integrated Products, MAX3798ETJ+T Datasheet

IC LIMITING AMP/VCSEL DVR 32TQFN

MAX3798ETJ+T

Manufacturer Part Number
MAX3798ETJ+T
Description
IC LIMITING AMP/VCSEL DVR 32TQFN
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX3798ETJ.pdf (35 pages)

Specifications of MAX3798ETJ+T

Amplifier Type
Limiting
Number Of Circuits
1
Output Type
Differential
Current - Supply
97mA
Voltage - Supply, Single/dual (±)
2.85 V ~ 3.63 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
32-TQFN Exposed Pad
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Current - Output / Channel
-
-3db Bandwidth
-
Slew Rate
-
Gain Bandwidth Product
-
Current - Input Bias
-
Voltage - Input Offset
-
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.
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.
Power SFP+ Limiting Amplifier and VCSEL Driver
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)
1.0625Gbps to 10.32Gbps, Integrated, Low-
________________________________________________________________ Maxim Integrated Products
General Description
Applications
♦ Low Power Dissipation of 320mW at 3.3V Power
♦ Up to 10.32Gbps (NRZ) Operation
♦ 3mV
♦ 4ps
♦ 4ps
♦ 26ps Rise and Fall Time at Rx/Tx Output
♦ Mode Select for High-Gain Mode and High-
♦ CML Output Slew-Rate Adjustment for High-Gain
♦ 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
♦ 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
+ Denotes a lead-free/RoHS-compliant package.
* EP = Exposed pad.
Typical Application Circuit and Pin Configuration appear at
end of data sheet.
Supply
2
Bandwidth Mode
Mode
Differential Load
MAX3798ETJ+
31
P-P
P-P
- 1 PRBS
PART
P-P
DJ at Receiver Output at 8.5Gbps 8B/10B
DJ at Receiver Output at 10.32Gbps
Receiver Sensitivity at 10.32Gbps
-40°C to +85°C
TEMP RANGE
Ordering Information
PIN-PACKAGE
32 TQFN-EP*
Features
1

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MAX3798ETJ+T Summary of contents

Page 1

... Optical Transceiver 10GBASE-LR SFP+ Optical Transceiver (1310nm VCSEL) 10GBASE-LRM SFP+ Optical Transceiver (1310nm VCSEL) ________________________________________________________________ Maxim Integrated Products 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. ♦ Low Power Dissipation of 320mW at 3.3V Power Supply ♦ ...

Page 2

Integrated, Low- Power SFP+ Limiting Amplifier and VCSEL Driver ABSOLUTE MAXIMUM RATINGS .................................................-0.3V to +4.0V CCR CCT CCD Voltage Range at DISABLE, SDA, SCL, CSEL, MSEL, FAULT, BMON, LOS, BMAX, MMAX, CAZ2...............................-0.3V ...

Page 3

Integrated, Low- Power SFP+ 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 ...

Page 4

Integrated, Low- Power SFP+ 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 ...

Page 5

Integrated, Low- Power SFP+ 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 ...

Page 6

Integrated, Low- Power SFP+ 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 ...

Page 7

Integrated, Low- Power SFP+ 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 ...

Page 8

Integrated, Low- Power SFP+ Limiting Amplifier and VCSEL Driver Note 5: Receiver deterministic jitter is measured with a repeating 2 8.5Gbps, a repeating K28.5 pattern [00111110101100000101] is used. Deterministic jitter is defined as the arithmetic sum of ...

Page 9

Integrated, Low- Power SFP+ Limiting Amplifier and VCSEL Driver 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 ...

Page 10

Integrated, Low- Power SFP+ 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 to CC ...

Page 11

Integrated, Low- Power SFP+ Limiting Amplifier and VCSEL Driver (V = 3.3V +25°C, unless otherwise specified. Figure 1 shows the typical setup used for measurements. Registers are set default values unless otherwise ...

Page 12

Integrated, Low- Power SFP+ 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 to CC ...

Page 13

Integrated, Low- Power SFP+ 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 to CC ...

Page 14

Integrated, Low- Power SFP+ 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 ...

Page 15

Integrated, Low- Power SFP+ Limiting Amplifier and VCSEL Driver AZ_EN RIN+ RIN- MSEL MODE_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 ...

Page 16

Integrated, Low- Power SFP+ Limiting Amplifier and VCSEL Driver The limiting amplifier features a high-gain mode and a high-bandwidth mode allowing for overall system opti- mization. Either the MSEL pin or the MODE_SEL bit can perform the ...

Page 17

Integrated, Low- Power SFP+ Limiting Amplifier and VCSEL Driver controls the output eye-crossing adjustment. A status indicator bit (TXED) monitors the presence input signal. The bias current from the MAX3798 is optimized to pro- ...

Page 18

Integrated, Low- Power SFP+ Limiting Amplifier and VCSEL Driver BIAS I V CCT MOD BMAX I BIAS V CCT I BIAS 16 MMAX BMON V CCT 8kΩ DISABLE LOSS-OF-SIGNAL CIRCUIT Figure 3. Eye Safety Circuitry 18 ______________________________________________________________________________________ ...

Page 19

Integrated, Low- Power SFP+ Limiting Amplifier and VCSEL Driver Table 3. Circuit Response to Single-Point Faults PIN NAME SHORT LOS Normal (Note 1) 2 MSEL Normal (Note Normal CCR 4 ROUT+ ...

Page 20

Integrated, Low- Power SFP+ Limiting Amplifier and VCSEL Driver Table 3. Circuit Response to Single-Point Faults (continued) PIN NAME SHORT CAZ2 Normal (Note 1) CAZ1 Disabled—Fault (external supply shorted) (Note 2) ...

Page 21

Integrated, Low- Power SFP+ Limiting Amplifier and VCSEL Driver 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

Integrated, Low- Power SFP+ Limiting Amplifier and VCSEL Driver Bit # 7 6 Name X X Default Value X X Bit 3: CAZX. When CAZX is set external capacitor is required (CAZ1 and CAZ2). ...

Page 23

Integrated, Low- Power SFP+ Limiting Amplifier and VCSEL Driver Bit 2: RX_EN. Enables or disables the receive circuitry disabled 1 = enabled Bit 1: RXDE_EN. Enables or disables the deemphasis on the receiver output. 0 ...

Page 24

Integrated, Low- Power SFP+ 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 ...

Page 25

Integrated, Low- Power SFP+ Limiting Amplifier and VCSEL Driver 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 ...

Page 26

Integrated, Low- Power SFP+ 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 ...

Page 27

Integrated, Low- Power SFP+ Limiting Amplifier and VCSEL Driver 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 ...

Page 28

Integrated, Low- Power SFP+ 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 ...

Page 29

Integrated, Low- Power SFP+ Limiting Amplifier and VCSEL Driver Table 7. Register Summary REGISTER REGISTER NORMAL FUNCTION/ NAME MODE ADDRESS Receiver Control RXCTRL1 Register 1 Address = H0x00 Receiver Control Register 2 RXCTRL2 Address = H0x01 Receiver ...

Page 30

Integrated, Low- Power SFP+ Limiting Amplifier and VCSEL Driver Table 7. Register Summary (continued) REGISTER REGISTER NORMAL FUNCTION/ NAME MODE ADDRESS LOS Threshold Level Setting SET_LOS Register Address = H0x04 Transmitter Control Register TXCTRL Address = H0x05 ...

Page 31

Integrated, Low- Power SFP+ Limiting Amplifier and VCSEL Driver Table 7. Register Summary (continued) REGISTER REGISTER NORMAL FUNCTION/ NAME MODE ADDRESS Bias Current Setting Register SET_IBIAS Address = H0x08 Accessible through REG_ADDR = 13 Modulation Current Setting ...

Page 32

Integrated, Low- Power SFP+ Limiting Amplifier and VCSEL Driver Table 7. Register Summary (continued) REGISTER REGISTER NORMAL FUNCTION/ NAME MODE ADDRESS Modulation Current Increment MODINC Setting Register Address = H0x0C Bias Current Increment Setting BIASINC Register Address ...

Page 33

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

Page 34

Integrated, Low- Power SFP+ Limiting Amplifier and VCSEL Driver I MON 10G PIN FLEX ROSA R MON 10G VCSEL FLEX TOSA +3.3V VSEL MD +3. 2kΩ 34 ______________________________________________________________________________________ SFP OPTICAL TRANSCEIVER +3.3V SUPPLY FILTER 1nF ...

Page 35

... 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 35 © 2008 Maxim Integrated Products ...

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