MAX3795 Datasheet, PDF (1/15 Pages) Maxim Integrated Products – 1Gbps to 4.25Gbps Multirate VCSEL Driver with Diagnostic Monitors

19-3387; Rev 0; 8/04
1Gbps to 4.25Gbps Multirate VCSEL
Driver with Diagnostic Monitors
General Description
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 ✕ 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.
Applications
Multirate (1Gbps to 4.25Gbps) SFP/SFF Modules
Gigabit Ethernet Optical Transmitters
Fibre-Channel Optical Transmitters
Features
♦ 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
Speed
♦ Supports Common-Cathode and Differential
Configuration
♦ Safety Circuits Compliant with SFF and SFP
MSAs
♦ Pin Compatible to MAX3740A
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX3795ETG -40°C to +85°C 24 Thin QFN (4mm x 4mm)
MAX3795ETG+ -40°C to +85°C 24 Thin QFN (4mm x 4mm)
+Denotes lead-free package.
Pin Configuration
TOP VIEW
GND 1
TX_DISABLE 2
IN+ 3
IN- 4
FAULT 5
SQUELCH 6
MAX3795
18 BIAS
17 BIASSET
16 V_CC
15 OUT+
14 OUT-
13 GND
THIN QFN (4mm x 4mm)
EXPOSED PAD IS CONNECTED TO GND
________________________________________________________________ Maxim Integrated Products 1
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.