MAX3967AETG+T Fast Delivery |IC PHOENIX CO.,LIMITED

MAX3967AETG+T ,270Mbps SFP LED DriverELECTRICAL CHARACTERISTICS(Load as specified in Figure 1; V = +2.97V to +5.5V (at the V pins); V V ..
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MAX7461EUK ,Loss-of-Sync Alarm
MAX7461EUK+T ,Loss-of-Sync Alarm

MAX3967AETG+T
270Mbps SFP LED Driver
General Description
The MAX3967A 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 MAX3967A’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 MAX3967A is
available in die form, or in a 4mm x 4mm, 24-pin thin
QFN package.
Applications
Multimode LED Transmitters
Fast Ethernet/FDDI
155Mbps LAN ATM Transceivers
ESCON Receivers
SFP Transceivers
FeaturesTX_DISABLE for SFP CompatibilitySingle +2.97V to +5.5V Power SupplyAdjustable Temperature CompensationAdjustable Modulation CurrentComplementary Output Reduces Supply NoiseProgrammable LED Prebias VoltageAvailable in 24-Pin Thin QFN or Die
MAX3967A
270Mbps SFP LED Driver
TOP VIEW
THE EXPOSED PAD MUST BE CONNECTED TO GROUND FOR
PROPER THERMAL AND ELECTRICAL PERFORMANCE
MAX3967A
THIN QFN (4mm x 4mm)
TCNOM
PB1PB2PB3
EEOUT
OUT+
OUT+
OUT-
N.C.
CCOUT
CCOUT
N.C.MONMODSET
IN-
IN+
VCC
VEE
TX_DISABLE
TCMINVEEOUT
OUT-
Pin Configuration
19-3629; Rev 0; 3/05
Ordering Information
PARTTEMP RANGEPIN-PACKAGE
MAX3967AETG-40°C to +85°C24 Thin QFN
MAX3967AE/D-40°C to +85°CDice*
Typical Operating Circuits appear at end of data sheet.
*Dice are tested and guaranteed only at TA= +25°C.
MAX3967A
270Mbps SFP LED Driver
ABSOLUTE MAXIMUM RATINGS
Supply Voltage at VCC, VCCOUT
(VEE, VEEOUT = 0V)..............................................-0.5V to +7V
Current into OUT+, OUT-................................-40mA to +160mA
Differential Output Voltage (OUT+ to OUT-).........-3.3V to +3.3V
Voltage at PB1, PB2, PB3,
IN+, IN-, OUT+, OUT-, TX_DISABLE......-0.5V to (VCC+ 0.5V)
Voltage at TCMIN, TCNOM, TC, MODSET, MON....-0.5V to +2V
Continuous Power Dissipation (TA= +85°C)
24-Lead Thin QFN (derate 20.8mW/C°
above +85°C).............................................................1354mW
Operating Junction Temperature Range...........-40°C to +150°C
Die Attach Temperature...................................................+375°C
Storage Temperature Range.............................-50°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
DC ELECTRICAL CHARACTERISTICS
(Load as specified in Figure 1; VCC= +2.97V to +5.5V (at the VCCpins); VEE, VEEOUT= 0V; TA= -40°C to +85°C, unless otherwise
noted. Temperature coefficients are referenced to TA= +25°C. Typical values are at VCC= +3.3V, TA= +25°C, unless otherwise
noted. Dice are tested at TA= +25°C only.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Data Input High VoltageReferenced to VCC, DC-coupled input-1.165-0.880V
Data Input Low VoltageReferenced to VCC, DC-coupled input-1.810-1.475V
Supply CurrentICC(Note 1)3039mA
Input Current at IN+ or IN--50+50µA
TA = -40°C109
TA = +25°C112126140RMODSET = 698Ω
(Note 2)TA = +85°C126140155
TA = -40°C15.3
TA = +25°C17.519.825RMODSET = 3.0kΩ
(Note 2)
TA = +85°C21.92428.7
TA = -40°C657489
TA = +25°C VCC = 3.3V798689
Modulation Current
RMODSET = 1.0kΩ
(Note 2)
TA = +85°C9096110
PB1, PB2, PB3 = (open, open, open)0.3680.4000.451
PB1, PB2, PB3 = (VEE, VEE, open)0.5750.6250.696Prebias Voltage
PB1, PB2, PB3 = (VEE, VEE, VEE)0.8480.9251.026
Maximum tempco (TC open)12,000
Nominal tempco (TC shorted to TCNOM)3600Temperature Coefficient of
Modulation Current
Minimum tempco (TC shorted to TCMIN)2500
ppm/°C
Prebias ResistorRPREBIAS667890Ω
TX_DISABLE ResistanceResistance to VEE (Note 3)5065100kΩ
TX_DISABLE HighVIH2.0V
TX_DISABLE LowVIL0.8V
Monitor GainIMON / IMODSET, VMON < 1.1V,
RMODSET = 1kΩ, TC = TCMIN0.9211.08A/A
Note 1:RMODSET= 1kΩ. Excludes IOUT+ and IOUT-, TX_DISABLE high or low.
Note 2:TC connected to TCMIN, PB1 = PB2 = VEE, PB3 = open.
Note 3:The TX_DISABLE pin is internally pulled low. The driver is enabled when TX_DISABLE is left open.
MAX3967A
270Mbps SFP LED Driver
AC ELECTRICAL CHARACTERISTICS
(Load as specified in Figure 1, unless otherwise noted. VCC= +2.97V to +5.5V (at the VCCpins), RMODSET= 1kΩ, TA= -40°C to
+85°C. Input data shaped by 470MHz 4-pole filter, PB1 = PB2 = VEE, PB3 = open. Typical values are at VCC= +3.3V, TC connected
to TCMIN, TA= +25°C.) (Note 4)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Data Input RangeDifferential input5002400mVP-P
Output-Current Edge Speed20% to 80%, input is a 12.5MHz square wave3006151230ps
Output-Current Pulse-Width
Correction (PWC)(Note 5)-90ps
266Mbps (Note 6)140Output-Current Data-Dependent
JitterDJ155Mbps (Note 7)150250psP-P
Random JitterRJ3psRMS
TX_DISABLE Assert Timet_offTime from rising edge of TX_DISABLE to
output at 10% of steady state0.010.5µs
TX_DISABLE Negate Timet_onTime from rising edge of TX_DISABLE to
output at 90% of steady state0.010.5µs
Power-On Timet_initTime from VCC > 2.97V to output at 90% of
steady state0.12ms
Figure 1. MAX3967A Output Test Loads
SWITCHING DIODE
OSCILLOSCOPE
OUT-
OUT+
OUT+OUT-
AC ELECTRICAL LOADDC ELECTRICAL LOAD
FOR PREBIAS VOLTAGE
DC ELECTRICAL LOAD
(EXCEPT PREBIAS VOLTAGE)
OUT+OUT-
MAX3967AMAX3967AMAX3967A
VCC
VCC
VLED
1.55V
50Ω
50Ω
0.22μF
0.22μF
FERRITE
BEAD
VCC
VPREBIAS
Note 4:AC characteristics are guaranteed by design and characterization.
Note 5:PWC = (widthCURRENT ON- widthCURRENT OFF) / 2.
Note 6:Test pattern is a K28.5 (0011 1110 1011 0000 0101) transmitted at 266Mbps.
Note 7:Test pattern is equivalent to a 213- 1 PRBS containing 72 consecutive zeros or 72 consecutive ones.
MAX3967A
270Mbps SFP LED Driver
Typical Operating Characteristics
(MAX3967AETG in Maxim evaluation board, VCC= +3.3V, PB1 = PB2 = VEE, PB3 = open, TC connected to TCNOM, RMODSET=
1kΩ, TA= +25°C, unless otherwise noted.)
SUPPLY CURRENT
vs. TEMPERATURE
MAX3967 toc01
AMBIENT TEMPERATURE (°C)
SUPPLY CURRENT (mA)
EXCLUDES CURRENT INTO OUT+ AND OUT-
VCC = 5.0V
VCC = 3.3V
MODULATION CURRENT
vs. TEMPERATURE
MAX3967 toc02
AMBIENT TEMPERATURE (°C)
MODULATION CURRENT (mA)
MINIMUM TEMPCO
NOMINAL TEMPCO
MAXIMUM TEMPCO
DIE MODULATION CURRENT
vs. TEMPERATURE
MAX3967 toc03
JUNCTION TEMPERATURE (°C)
MODULATION CURRENT (mA)
MINIMUM TEMPCO
NOMINALTEMPCO
MAXIMUM TEMPCO
100,000
MODULATION CURRENT TEMPCO
vs. RTC
MAX3967 toc04
RTC (kΩ)
MODULATION CURRENT TEMPCO (ppm/
10,000
5001k10k
MODULATION CURRENT
vs. RMODSET
MAX3967 toc05
RMODSET (Ω)
MODULATION CURRENT (mA)
MINIMUM TEMPCO
NOMINAL TEMPCO
MAXIMUM TEMPCO
5001k8k
DIE MODULATION CURRENT
vs. RMODSET
MAX3967 toc06
RMODSET (Ω)
MODULATION CURRENT (mA)
MAXIMUM TEMPCO
NOMINAL TEMPCO
MINIMUM TEMPCO
EYE DIAGRAM (ELECTRICAL)
266Mbps
MAX3967 toc07
500ps/div
PATTERN = 231 - 1 PRBS
EYE DIAGRAM (OPTICAL)
155Mbps
MAX3967 toc08
1ns/div
RECEIVER BW = 200MHz, VCC = 2.97V, TA = +85°C,
EYE DIAGRAM (OPTICAL)
155Mbps
MAX3967 toc09
1ns/div
RECEIVER BW = 200MHz, VCC = 5.5V, TA = -40°C,
MAX3967A
270Mbps SFP LED Driver
EYE DIAGRAM (OPTICAL)
155Mbps
MAX3967 toc10
1ns/div
RECEIVER BW = 200MHz, VCC = 5.5V, TA = +85°C,
PAVE = -17.1dBm, PATTERN = 231 - 1 PRBS
EYE DIAGRAM (OPTICAL)
155Mbps
MAX3967 toc11
1ns/div
RECEIVER BW = 200MHz, VCC = 2.97V, TA = -40°C,
PAVE = -15.8dBm, PATTERN = 231 - 1 PRBS102030405060708090
RANDOM JITTER
vs. TEMPERATURE
MAX3967 toc12
AMBIENT TEMPERATURE (°C)
RANDOM JITTER (ps
RMS
VCC = 5.0V
MINIMUM TEMPCO
VCC = 3.3V
MAXIMUM TEMPCO
TX_DISABLE NEGATE TIME
MAX3967 toc13
4ns/div
LED
OUTPUT
TX_DISABLE
t_on
TX_DISABLE ASSERT TIME
MAX3967 toc14
4ns/div
LED
OUTPUT
TX_DISABLE
t_off
Typical Operating Characteristics (continued)
(MAX3967AETG in Maxim evaluation board, VCC= +3.3V, PB1 = PB2 = VEE, PB3 = open, TC connected to TCNOM, RMODSET=
1kΩ, TA= +25°C, unless otherwise noted.)
MAX3967A
Detailed Description
The MAX3967A provides a flexible current drive for the
modulation of fiber optic light-emitting diodes (LEDs).
The circuit is designed to be used with +3.3V or +5V
power supplies. The IC provides up to 100mA of modu-
lation current. An adjustable prebias current source sets
the LED prebias voltage. An integrated resistor provides
passive peaking and optical pulse-width compensation.
Figure 2shows a block diagram of the MAX3967A,
which comprises a reference-voltage generator, modu-
lation-current generator, input buffer with disable, pre-
bias-current generator, main output driver,
complementary output driver, and LED-compensation
network.
Temperature Compensation
The reference-voltage generator circuit provides two
voltage sources that create modulation-current tempera-
ture compensation. A positive modulation-current tem-
perature coefficient (tempco) is useful to compensate
for the temperature characteristics of typical fiber optic
LEDs. The first source has a temperature-stable output.
The second source has a temperature-increasing output
with a tempco of approximately 12,000ppm/°C (relative
to +25°C). A resistor-divider between the two reference
generators programs the modulation-current tempco.
For maximum modulation-current tempco, leave the TC
pin disconnected. For a tempco of approximately
3600ppm/°C, connect TC to TCNOM. To obtain the mini-
mum tempco, connect TCMIN to TC. Intermediate temp-
co values can be programmed by connecting an
external resistor (RTC) between TCMIN and TC.
Input Buffer
The inputs are connected to the PECL-compatible differ-
ential input buffer. If left unconnected, IN+ is internally
pulled to a PECL low and IN- is pulled to a PECL high,
causing low current at OUT+. The input impedance of
IN+ and IN- is approximately 50kΩ.
270Mbps SFP LED Driver
PINNAMEFUNCTIONTCNOMShorting TC to TCNOM provides a modulation tempco of approximately 3600ppm/°C.
2TCA resistor (RTC) connected between the TC and TCMIN pins sets the tempco of the modulation
current. Leaving RTC unconnected provides the maximum tempco.
3, 4, 5PB1, PB2, PB3Programs the Prebias Voltage at the OUT+ Pin (Table 1)
6, 7VEEOUTGround for the Output-Current Drivers
8, 9OUT+Current Output
10, 11OUT-Complementary Current Output
12, 16N.C.No Connection. Not internally connected.
13, 14VCCOUTSupply Connection for the Output-Current Drivers
15, 19VCCProvides Current to the Internal AmplifiersMONThe Current Sourced from the MON Pin is Proportional to the Modulator CurrentMODSETA Resistor from MODSET to VEE Programs the LED Modulation CurrentIN-Inverting Data InputIN+Noninverting Data InputTX_DISABLETransmit Disable. When high, the current at the OUT+ pins is in the low state. The transmitter is
enabled when TX_DISABLE is open.VEEGround for internal amplifiers.TCMINShorting TC to TCMIN provides the minimum modulation-current tempco.Exposed PadConnect the exposed pad to board ground for optimal correct electrical and thermal performance.
Pin Description
Modulation-Current Generator
The modulation-current generator circuit provides con-
trol of the modulation-current amplitude. This amplitude
is determined by the voltage at the MODSET pin and
external resistor RMODSET.
Do not connect bypass capacitors at the MODSET pin.
Capacitance at this pin increases high-frequency out-
put noise. The MON pin provides an optional modula-
tion-current monitor. The current sourced from the MON
pin is 1/96 of the modulation current. If used, the pin
should be connected to VEEthrough a resistor. The
resistance must be chosen so the voltage on MON
does not exceed 1.1V. If not used, leave MON open.
Prebias Current Generator
A prebias voltage (VPREBIAS) can be applied to the
LED to improve switching speed. The prebias current
generator creates a current that flows through the 78Ω
prebias resistor in the output stage, creating a prebias
voltage. The prebias voltage can be adjusted by selec-
tively connecting pins PB1, PB2, and PB3 to VEE. Table 1
describes the functions of PB1, PB2, and PB3.
Output Current Drivers
The modulation-current reference is switched and
amplified by the output stages.
LED package lead inductance causes ringing and
overshoot, which can be compensated with an RC filter
network. The MAX3967A includes 35Ωand 12pF of
MAX3967A
270Mbps SFP LED Driver
Figure 2. Functional Diagram
12pF
MODULATION-
CURRENT
GENERATOR
REFERENCE-VOLTAGE GENERATOR
PREBIAS-CURRENT
GENERATOR
COMPLEMENTARY
OUTPUT
24X
MAIN
OUTPUT
24X
TEMP
TCMIN
PB1PB2PB3
TCNOMTCMODSETMON
1.2V
OUT-
OUT+
IN-
IN+
INPUT
BUFFER
GAIN 4X
MAX3967A
RMODSET
VCCOUTTX_DISABLE
50Ω
35Ω
VCC
RPREBIAS
78Ω0

Partno	Mfg	Dc	Qty	Available	Descript
MAX3967AETG+T	MAXIM	N/a	7	avai	270Mbps SFP LED Driver