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PDF MAX3795 Data sheet ( Hoja de datos )
| Número de pieza | MAX3795 | |
| Descripción | 1Gbps to 4.25Gbps Multirate VCSEL Driver | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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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-
www.DataSheevcteo4rUnf.aicgocumcroamtiomnso.dates common-cathode and differential
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
TX_DISABLE
IN+
IN-
FAULT
SQUELCH
1
2
3
4
5
6
MAX3795
18 BIAS
17 BIASSET
16 VCC
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.
1 page  
1Gbps to 4.25Gbps Multirate VCSEL Driver
with Diagnostic Monitors
Typical Operating Characteristics
(VCC = +3.3V, RTC = 0Ω, PEAKSET open, measured electrically with a 50Ω load AC-coupled to OUT+, TA = +25°C, unless otherwise
noted.)
ELECTRICAL EYE DIAGRAM
MAX3795 toc01
4.25Gbps, K28.5, 10mA MODULATION,
PEAKING OFF
ELECTRICAL EYE DIAGRAM
MAX3795 toc02
1Gbps, K28.5, 10mA MODULATION,
RPEAKSET = 1.4kΩ
OPTICAL EYE DIAGRAM
MAX3795 toc03
1Gbps, K28.5, -3dBm, 850nm VCSEL
ADVANCED OPTICAL COMPONENTS,
1 HFE4191-541
www.DataSheet4U.com
75mV/div
75mV/div
2
40ps/div
152ps/div
3
135ps/div
OPTICAL EYE DIAGRAM
MAX3795 toc04
4.25Gbps, K28.5, -7dBm, 850nm VCSEL,
ADVANCED OPTICAL COMPONENTS
HFE4191-541
34ps/div
OPTICAL EYE DIAGRAM
MAX3795 toc05
3.125Gbps, K28.5, -7dBm, 850nm VCSEL,
ADVANCED OPTICAL COMPONENTS
HFE4191-541
50ps/div
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0
IBIASMON vs. BIAS CURRENT
4 8 12
BIAS CURRENT (mA)
16
DETERMINISTIC JITTER
vs. MODULATION CURRENT
40
35
30
25
20
15
10
5
0
0 2 4 6 8 10 12 14 16 18 20
MODULATION CURRENT (mAP-P)
RANDOM JITTER
vs. MODULATION CURRENT
3.5
IBIAS = 5mA
3.0
2.5
2.0
1.5
1.0
0.5
0
0 2 4 6 8 10 12 14 16 18 20
MODULATION CURRENT (mAP-P)
TRANSITION TIME
vs. MODULATION CURRENT
70
MEASURED FROM 20%
60 FALL TIME
50
40 RISE TIME
30
20
10
0
2 4 6 8 10 12 14
MODULATION CURRENT (mA)
_______________________________________________________________________________________ 5
5 Page 
1Gbps to 4.25Gbps Multirate VCSEL Driver
with Diagnostic Monitors
TX_DISABLE
BIAS
BIASMON
www.DataSheet4U.com
PWRMON
TX_DISABLE
VCC - 0.2V
0.8V
0.8V
Figure 2. Safety Circuit
IN+
IN-
SQUELCH
MAX3795
INPUT BUFFER
100Ω
VBIAS FAULT
HIGH-CURRENT FAULT
HIGH-POWER FAULT
POR
RQ
S
R-S LATCH
FAULT
OUTPUT
FAULT
ENABLE
SAFETY CIRCUIT
MAX3795
VCC
ROUT
CURRENT SWITCH
ROUT
SIGNAL
DETECT
ENABLE
CURRENT AMPLIFIER 40x
PEAKING
CONTROL
MODULATION
CURRENT GENERATOR
OUT+
OUT-
PEAKSET
RPEAKSET
TEMPERATURE
COMPENSATION
1V
TC1 TC2
RTC
200Ω
MODSET
RMODSET
Figure 3. Modulation Circuit
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet MAX3795.PDF ] | |
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