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PDF MAX3967E Data sheet ( Hoja de datos )
| Número de pieza | MAX3967E | |
| Descripción | 270Mbps SFP LED Driver | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-3252; Rev 0; 5/04
270Mbps SFP LED Driver
General Description
The MAX3967 is a programmable LED driver for fiber
optic transmitters operating at data rates up to
270Mbps. The circuit contains a high-speed current dri-
ver with programmable temperature coefficient (temp-
co), adjustments for LED prebias voltage, and a disable
feature. The circuit accepts PECL data inputs, and
operates from a single +2.97V to +5.5V power supply.
The SFP LED driver can switch up to 100mA into typical
high-speed light-emitting diodes. As temperature
increases, the device’s modulation current increases
with a tempco that is programmable from 2500ppm/°C
to 12,000ppm/°C. The modulation current is pro-
grammed with a single external resistor.
The MAX3967’s LED prebias voltage is programmable
from 400mV to 925mV. The prebias circuit produces
peaking current, which improves the LED switching
speed.
Complementary current outputs help to maintain a con-
stant supply current, reducing EMI and supply noise
generated by the transmitter module. The MAX3967 is
available in die form, or in a 4mm x 4mm, 24-pin thin
QFN package.
Features
♦ TX_DISABLE for SFP Compatibility
♦ Single +2.97V to +5.5V Power Supply
♦ Adjustable Temperature Compensation
♦ Adjustable Modulation Current
♦ Complementary Output Reduces Supply Noise
♦ Programmable LED Prebias Voltage
♦ Available in 24-Pin QFN or Die
Ordering Information
PART
MAX3967ETG
MAX3967E/D
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
24 Thin QFN
Dice*
*Dice are tested and guaranteed only at TA = +25°C.
Applications
Multimode LED Transmitters
Fast Ethernet/FDDI
155Mbps LAN ATM Transceivers
ESCON Receivers
SFP Transceivers
Typical Operating Circuits appear at end of data sheet.
TOP VIEW
Pin Configuration
24 23 22 21 20 19
TCNOM 1
18 MODSET
TC 2
17 MON
PB1 3
PB2 4
MAX3967
16 N.C.
15 VCC
PB3 5
14 VCCOUT
VEEOUT 6
13 VCCOUT
7 8 9 10 11 12
THIN QFN (4mm x 4mm)
THE EXPOSED PAD MUST BE CONNECTED TO GROUND FOR
PROPER THERMAL AND ELECTRICAL PERFORMANCE
________________________________________________________________ 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  
270Mbps SFP LED Driver
Typical Operating Characteristics (continued)
(MAX3967ETG in Maxim evaluation board, VCC = 3.3V, PB1 = PB2 = VEE, PB3 = open, TC connected to TCNOM, RMODSET = 1kΩ,
TA = +25°C, unless otherwise noted.)
EYE DIAGRAM (OPTICAL)
155Mbps
MAX3967 toc10
EYE DIAGRAM (OPTICAL)
155Mbps
MAX3967 toc11
6
RANDOM JITTER
vs. TEMPERATURE
5
4
VCC = 3.3V
MAXIMUM TEMPCO
3
2
1ns/div
RECEIVER BW = 200MHz, VCC = 5.5V, TA = +85°C,
PAVE = -17.1dBm, PATTERN = 231 - 1 PRBS
1ns/div
RECEIVER BW = 200MHz, VCC = 2.97V, TA = -40°C,
PAVE = -15.8dBm, PATTERN = 231 - 1 PRBS
1
VCC = 5.0V
MINIMUM TEMPCO
0
0 10 20 30 40 50 60 70 80 90
AMBIENT TEMPERATURE (°C)
TX_DISABLE NEGATE TIME
MAX3967 toc13
TX_DISABLE ASSERT TIME
MAX3967 toc14
LED
OUTPUT
TX_DISABLE
t_on
4ns/div
LED
OUTPUT
TX_DISABLE
t_off
4ns/div
_______________________________________________________________________________________ 5
5 Page 
270Mbps SFP LED Driver
Typical Operating Circuits (continued)
SFF TRANSMITTER WITH DISABLE
VCC FERRITE BEAD
DISABLE
TX_DISABLE
VCC
VCCOUT
OUT-
PECL
DATA
IN+
MAX3967
IN-
MON
PB1 PB2 PB3 TCMIN TCNOM
OUT+
VEEOUT
VEE
TC MODSET
*OPTIONAL COMPONENT
RTC* RMODSET
SFF TRANSMITTER WITHOUT DISABLE
VCC FERRITE BEAD
PECL
DATA
TX_DISABLE
VCC
VCCOUT
OUT-
IN+ OUT+
MAX3967
IN-
MON
VEEOUT
VEE
PB1 PB2 PB3 TCMIN TCNOM TC MODSET
RMODSET
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet MAX3967E.PDF ] | |
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