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PDF MAX3741 Data sheet ( Hoja de datos )
| Número de pieza | MAX3741 | |
| Descripción | 3.2Gbps Compact SFP VCSEL Driver | |
| Fabricantes | Maxim Integrated | |
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19-2597; Rev 1; 5/04
3.2Gbps Compact SFP VCSEL Driver
General Description
The MAX3741 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 generator,
laser modulator, and peaking current option to improve
VCSEL edge speed. The driver accommodates common
cathode and differential configurations.
The MAX3741 operates up to 3.2Gbps. It can switch up
to 15mA of laser modulation current and source up to
15mA of bias current. The MAX3741 is designed to inter-
face with a digital potentiometer and control circuitry.
The MAX3741 accommodates various VCSEL packages,
including low-cost TO-46 headers.
The MAX3741 is available in a compact 3mm x 3mm
16-pin thin QFN package and operates over a tempera-
ture range of -40°C to +85°C.
Applications
Multirate (1Gbps to 3.2Gbps) SFP/SFF Modules
Gigabit Ethernet Optical Transmitters
Fibre Channel Optical Transmitters
Features
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 3mm × 3mm 16-Pin Thin QFN Package
Ordering Information
PART
TEMP
RANGE
PIN-
PACKAGE
PKG.
CODE
MAX3741ETE -40°C to +85°C 16 Thin QFN T1633F-3
Typical Application Circuit
+3.3V
Pin Configuration
0.01µF
0.1µF
IN+
IN-
0.1µF
VCC
BIAS
MAX3741
0.01µF
OUT+
0.01µF
OUT-
TX_DISABLE
BIASMON
BIASSET MODSET GND PEAKSET
L1*
50Ω
RBIASSET
RMODSET
RPEAKSET
RMON
TOP VIEW
16 15 14 13
TX_DISABLE 1
IN+ 2
IN- 3
N.C. 4
MAX3741
3mm x 3mm
567 8
12 BIASMON
11 OUT+
10 OUT-
9 VCC
THIS SYMBOL REPRESENTS A TRANSMISSION LINE OF
CHARACTERISTIC IMPEDANCE Zo = 50Ω.
* FERRITE BEAD, MURATA BLM18HD102SN1B
THIN QFN
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  
3.2Gbps Compact SFP VCSEL Driver
Typical Operating Characteristics (continued)
(VCC = +3.3V, TA = 25°C, measured electrically with a 50Ω load AC-coupled to OUT+, unless otherwise noted.)
80
75
70
65
60
55
50
45
40
2
TRANSITION TIME vs. IMOD
MEASURED FROM
20% TO 80%
RISE TIME
FALL TIME
4 6 8 10 12 14 16
IMOD (mA)
SUPPLY CURRENT vs. TEMPERATURE
80
IMOD = 2mAP-P
70
60
50
40
30
20
10
-40
-15 10 35 60
TEMPERATURE (°C)
85
POWER-SUPPLY REJECTION
0
PSR = 20log ∆VOUT
∆VCC
-2
-4
-6
-8
-10
-12
100 1k 10k 100k 1M 10M 100M
FREQUENCY (Hz)
PIN
1
2
3
4
5, 9, 15
6
7
8, 16
10
11
12
13
14
EP
Pin Description
NAME
FUNCTION
TX_DISABLE
Transmit Disable. Driver output is disabled when TX_DISABLE is high or left unconnected. The driver
output is enabled when the pin is asserted low.
IN+ Noninverted Data Input
IN- Inverted Data Input
N.C.
No Connection
VCC +3.3V Supply Voltage
MODSET Modulation Set. A resistor connected from MODSET to ground (RMODSET) programs the desired
modulation current amplitude.
PEAKSET
GND
OUT-
OUT+
Peaking Current Set. A resistor connected between PEAKSET and ground (RPEAKSET) programs the
peaking current amplitude. To disable peaking, leave PEAKSET open.
Ground
Inverted Modulation-Current Output
Noninverted Modulation-Current Output
BIASMON
Bias Current Monitor. The output of BIASMON is a sourced current proportional to the bias current. A
resistor connected between BIASMON and ground (RBIASMON) can be used to form a ground
referenced bias monitor.
BIAS
Bias Current Output
BIASSET Bias Current Set. A resistor connected between BIASSET and ground (RBIASSET) programs the
VCSEL bias current.
Exposed Ground. This must be soldered to the circuit board ground for proper thermal and electrical
Pad performance. See the Layout Considerations section.
_______________________________________________________________________________________ 5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet MAX3741.PDF ] | |
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