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PDF MAX3740 Data sheet ( Hoja de datos )
| Número de pieza | MAX3740 | |
| Descripción | 3.2Gbps SFP VCSEL Driver with Diagnostic Monitors | |
| Fabricantes | Maxim Integrated | |
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19-2679; Rev 2; 7/03
3.2Gbps SFP VCSEL Driver with Diagnostic
Monitors
General Description
The MAX3740 is a high-speed VCSEL driver for small-
form-factor (SFF) and small-form-factor pluggable (SFP)
fiber optic LAN transmitters. It contains a bias genera-
tor, a laser modulator, and comprehensive safety fea-
tures. The automatic power control (APC) adjusts the
laser bias current to maintain average optical power
over changes in temperature and laser properties. The
driver accommodates common cathode and differential
configurations.
The MAX3740 operates up to 3.2Gbps. It can switch up
to 15mA of laser modulation current and source up to
15mA of bias current. Adjustable temperature compen-
sation is provided to keep the optical extinction ratio
within specifications over the operating temperature
range. The MAX3740 interfaces with the Dallas DS1858
to meet SFF-8472 timing and diagnostic requirements.
The MAX3740 accommodates various VCSEL pack-
ages, including low-cost TO-46 headers.
The MAX3740 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 (MSA).
The MAX3740 is available in a compact 4mm ✕ 4mm,
24-pin thin QFN package and operates over the -40°C
to +85°C temperature range.
Applications
Multirate (1Gbps to 3.2Gbps) SFP/SFF Modules
Gigabit Ethernet Optical Transmitters
Fibre Channel Optical Transmitters
Infiniband Optical Transmitters
Features
o Supports all SFF-8472 Digital Diagnostics
o 2mA to 15mA Modulation Current
o 1mA to 15mA Bias Current
o Optional Peaking Current to Improve VCSEL Edge
Speed
o Supports Common Cathode and Differential
Configuration
o Automatic Power Control
o Safety Circuits Compliant with SFF and SFP
MSAs
o 4mm ✕ 4mm 24-Pin Thin QFN Package
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX3740ETG -40°C to +85°C 24 Thin QFN (4mm ✕ 4mm)
Typical Application Circuit
+3.3V
FAULT
VCC 4.7kΩ
0.1µF
0.1µF
RTC†
RBIASSET
TX_DISABLE
SQUELCH
MAX3740
IN+
FAULT
PWRMON
MODSET
REF
BIASMON
COMP
IN- MD
BIAS
TC1
TC2
BIASSET
GND
PEAKSET
OUT+
OUT-
RPEAKSET†
IN1 OUT1
MON2
H0 DS1858
H1 MON1
L0 L1
RBIASMON
0.047µF
0.01µF
0.01µF
50Ω
L1*
CF†
RF†
†OPTIONAL COMPONENT
*FERRITE BEAD
________________________________________________________________ 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  
3.2Gbps SFP 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
MAX3740 toc01
3.2Gbps, K28.5, 10mA MODULATION,
PEAKING OFF
ELECTRICAL EYE WITH PEAKING
MAX3740 toc02
3.2Gbps, K28.5, 10mA MODULATION,
RPEAKSET = 2.4kΩ
ELECTRICAL EYE WITH MAX PEAKING
MAX3740 toc03
3.2Gbps, K28.5, 10mA MODULATION,
RPEAKSET = 500Ω
73mV/div
73mV/div
73mV/div
50ps/div
50ps/div
50ps/div
OPTICAL EYE
MAX3740 toc04
ER = 8.2dB, 2.125Gbps, K28.5,
850nm VCSEL, WITH 2.3GHz
O-TO-E CONVERTER
EMCORE SC-TOSA-8585-3420 VCSEL
68ps/div
OPTICAL EYE
MAX3740 toc05
ER = 8.2dB, 2.5Gbps, K28.5,
850nm VCSEL SONET MASK
WITH +20% MARGIN
EMCORE SC-TOSA-8585-3420 VCSEL
58ps/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 5 10 15
IMOD (mAP-P)
RANDOM JITTER
vs. MODULATION CURRENT
7
6
5
4
3
2
1
0
0 5 10 15
IMOD (mAP-P)
TRANSITION TIME
vs. MODULATION CURRENT
100
90
80 RISE
70
60 FALL
50
40
2 4 6 8 10 12 14 16
IMOD (mAP-P)
_______________________________________________________________________________________ 5
5 Page 
3.2Gbps SFP VCSEL Driver with Diagnostic
Monitors
TX_DISABLE
BIAS
VCC - 0.2V
BIASMON
PWRMON
0.8V
0.8V
TX_DISABLE
VBIAS FAULT
HIGH-CURRENT FAULT
HIGH-POWER FAULT
POR
Figure 2. Safety Circuit
FAULT
RQ
S
R-S LATCH
OPEN-
DRAIN
NMOS
ENABLE
MAX3740
SAFETY CIRCUIT
VCC
IN+
IN-
SQUELCH
100Ω
MAX3740
ROUT-
INPUT BUFFER
CURRENT
SWITCH
SIGNAL
DETECT
ROUT+
PEAKING
CONTROL
ENABLE
CURRENT AMPLIFIER
30x
MODULATION
CURRENT
GENERATION
TEMPERATURE
COMPENSATION
1V
OUT+
OUT-
PEAKSET
RPEAKSET
TC1 TC2
RTC
MODSET
RMODSET
Figure 3. Modulation Circuit
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet MAX3740.PDF ] | |
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