MAX3795ETG+ Maxim Integrated Products, MAX3795ETG+ Datasheet

IC DRIVER VCSEL W/MON 24-TQFN

MAX3795ETG+

Manufacturer Part Number
MAX3795ETG+
Description
IC DRIVER VCSEL W/MON 24-TQFN
Manufacturer
Maxim Integrated Products
Type
Laser Diode Driverr
Datasheet

Specifications of MAX3795ETG+

Data Rate
4.25Gbps
Number Of Channels
1
Voltage - Supply
2.97 V ~ 3.63 V
Current - Supply
71mA
Current - Modulation
15mA
Current - Bias
15mA
Operating Temperature
-40°C ~ 85°C
Package / Case
24-TQFN Exposed Pad
Mounting Type
Surface Mount
Operating Supply Voltage
3.3 V
Minimum Operating Temperature
- 40 C
Mounting Style
SMD/SMT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX3795 is a high-speed VCSEL driver for small-
form-factor (SFF) and small-form-factor pluggable (SFP)
fiber optic transmitters. It contains a bias generator, a
laser modulator, and comprehensive safety features.
The automatic power control (APC) adjusts the laser
bias current to maintain average optical power over
changes in temperature and laser properties. The dri-
ver accommodates common-cathode and differential
configurations.
The MAX3795 operates up to 4.25Gbps. It can switch
up to 15mA of laser modulation current and source up
to 15mA of bias current. Adjustable temperature com-
pensation is provided to keep the optical extinction
ratio within specifications over the operating tempera-
ture range. The MAX3795 interfaces with the Dallas
DS1856/DS1859 to meet SFF-8472 timing and diagnos-
tic requirements. The MAX3795 accommodates various
VCSEL packages, including low-cost TO-46 headers.
The MAX3795 safety circuit detects faults that could
cause hazardous light levels and disables the VCSEL
output. The safety circuits are compliant with SFF and
SFP multisource agreements (MSAs).
The MAX3795 is available in a compact 4mm
24-pin thin QFN package and operates over the -40°C
to +85°C temperature range. The MAX3795 is pin-for-
pin compatible with the MAX3740A and is available in
lead-free packages.
19-3387; Rev 0; 8/04
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Multirate (1Gbps to 4.25Gbps) SFP/SFF Modules
Gigabit Ethernet Optical Transmitters
Fibre-Channel Optical Transmitters
________________________________________________________________ Maxim Integrated Products
General Description
1Gbps to 4.25Gbps Multirate VCSEL
Applications
Driver with Diagnostic Monitors
4mm,
♦ Supports All SFF-8472 Digital Diagnostics
♦ 3.3V ±10% Single Supply
♦ 2mA to 15mA Modulation Current
♦ 1mA to 15mA Bias Current
♦ 52ps Transition Time
♦ 8.4ps Deterministic Jitter
♦ Optional Peaking Current to Improve VCSEL Edge
♦ Supports Common-Cathode and Differential
♦ Safety Circuits Compliant with SFF and SFP
♦ Pin Compatible to MAX3740A
+Denotes lead-free package.
MAX3795ETG
MAX3795ETG+
Speed
Configuration
MSAs
TX_DISABLE
PART
SQUELCH
TOP VIEW
EXPOSED PAD IS CONNECTED TO GND
FAULT
GND
IN+
IN-
1
2
3
4
5
6
-40°C to +85°C 24 Thi n QFN ( 4m m x 4m m )
-40°C to +85°C 24 Thi n QFN ( 4m m x 4m m )
TEMP RANGE PIN-PACKAGE
THIN QFN (4mm x 4mm)
Ordering Information
MAX3795
Pin Configuration
18
17
16
15
14
13
Features
BIAS
BIASSET
V
OUT+
OUT-
GND
CC
1

Related parts for MAX3795ETG+

MAX3795ETG+ Summary of contents

Page 1

... Speed ♦ Supports Common-Cathode and Differential Configuration ♦ Safety Circuits Compliant with SFF and SFP MSAs ♦ Pin Compatible to MAX3740A PART ✕ 4mm, MAX3795ETG MAX3795ETG+ +Denotes lead-free package. Applications TOP VIEW TX_DISABLE FAULT SQUELCH EXPOSED PAD IS CONNECTED TO GND Features Ordering Information TEMP RANGE PIN-PACKAGE -40° ...

Page 2

Multirate VCSEL Driver with Diagnostic Monitors ABSOLUTE MAXIMUM RATINGS Supply Voltage (V ) ............................................-0.5V to +4.0V CC Voltage at TX_DISABLE, IN+, IN-, FAULT, SQUELCH, TC1, TC2, MODSET, PEAKSET, BIASSET, BIAS, BIASMON, COMP, MD, REF, PWRMON ...............................................-0.5V to ...

Page 3

Multirate VCSEL Driver ELECTRICAL CHARACTERISTICS (continued +2.97V to +3.63V -40°C to +85°C. Typical values are +25°C, unless otherwise noted.) PARAMETER SYMBOL Bias Current During Fault I BIASMON Gain G ...

Page 4

Multirate VCSEL Driver with Diagnostic Monitors ELECTRICAL CHARACTERISTICS (continued +2.97V to +3.63V -40°C to +85°C. Typical values are +25°C, unless otherwise noted.) PARAMETER SYMBOL Deterministic Jitter Random Jitter SAFETY ...

Page 5

Multirate VCSEL Driver (V = +3.3V 0Ω, PEAKSET open, measured electrically with a 50Ω load AC-coupled to OUT noted.) ELECTRICAL EYE DIAGRAM MAX3795 toc01 4.25Gbps, K28.5, 10mA MODULATION, PEAKING OFF 75mV/div 40ps/div ...

Page 6

Multirate VCSEL Driver with Diagnostic Monitors (V = +3.3V 0Ω, PEAKSET open, measured electrically with a 50Ω load AC-coupled to OUT noted.) BIAS CURRENT vs. R BIASSET 100 10 1 0.1 1 ...

Page 7

Multirate VCSEL Driver (V = +3.3V 0Ω, PEAKSET open, measured electrically with a 50Ω load AC-coupled to OUT noted.) MONITOR DIODE CURRENT vs. TEMPERATURE 300 275 250 225 200 175 150 125 ...

Page 8

Multirate VCSEL Driver with Diagnostic Monitors PIN NAME 1, 10, 13 GND Ground Transmit Disable. Driver output is disabled when TX_DISABLE is high or left unconnected. The 2 TX_DISABLE driver output is enabled when the pin is ...

Page 9

Multirate VCSEL Driver REF 1.8V (2VBE + 0.2) R PWRSET MD SMOOTH- START COMP Figure 1. Bias Generator Detailed Description The MAX3795 contains a bias generator with APC, safety circuit, and a laser modulator ...

Page 10

Multirate VCSEL Driver with Diagnostic Monitors Table 2. Circuit Response to Various Single-Point Faults (Closed-Loop APC Configuration) CIRCUIT RESPONSE TO PIN NAME V SHORT CC FAULT Does not affect laser power. Modulation and bias current are TX_DISABLE ...

Page 11

Multirate VCSEL Driver TX_DISABLE BIAS V - 0.2V CC BIASMON 0.8V PWRMON 0.8V TX_DISABLE Figure 2. Safety Circuit MAX3795 INPUT BUFFER IN+ 100Ω IN- SQUELCH TEMPERATURE COMPENSATION TC1 Figure 3. Modulation Circuit ______________________________________________________________________________________ with Diagnostic Monitors V ...

Page 12

Multirate VCSEL Driver with Diagnostic Monitors current. For appropriate R and R TC the Typical Operating Characteristics. Design Procedure Select a communications-grade laser with a rise time of 90ps or better for 4.25Gbps applications. Use a high- ...

Page 13

Multirate VCSEL Driver V CC 50W 50W Figure 5. Simplified Output Structure V CC MAX3795 Figure 6. Fault Circuit Interface − REF MD = ≈ PWRSET PWRSET ...

Page 14

... R R OUT OUT SIGNAL DETECT MODULATION CURRENT ENABLE GENERATOR TC1 TC2 MODSET For the latest package outline information www.maxim-ic.com/packages. PART MAX3795ETG MAX3795ETG+ Functional Diagram BIASMON BIAS BIAS GENERATOR WITH APC BIASSET LASER MODULATOR OUT- OUT+ PEAKING CONTROL PEAKSET Package Information PACKAGE TYPE ...

Page 15

... 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 ____________________ 15 © 2004 Maxim Integrated Products with Diagnostic Monitors † ...

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