Document
MAX3273
19-2081; Rev 3; 2/07
+3.3V, 2.5Gbps Low-Power Laser Driver
General Description
The MAX3273 is a compact, low-power laser driver for applications up to 2.7Gbps. The device uses a single +3.3V supply and typically consumes 30mA. The bias and modulation current levels are programmed by external resistors. An automatic power-control (APC) loop is incorporated to maintain a constant average optical power over temperature and lifetime. The laser driver is fabricated using Maxim’s in-house, secondgeneration SiGe process.
The MAX3273 accepts differential CML-compatible clock and data input signals. Inputs are self-biased to allow AC-coupling. An input data-retiming latch can be enabled to reject input jitter if a clock signal is available.
The driver can provide bias current up to 100mA and modulation current up to 60mAP-P with typical (20% to 80%) edge speeds of 59ps. A failure-monitor output is provided to indicate when the APC loop is unable to maintain average optical power. The MAX3273 is available in 4mm ✕ 4mm, 24-pin QFN and thin QFN packages, as well as in die form.
Applications
SONET OC-48 and SDH STM-16 Transmission Systems
Add/Drop Multiplexers
Digital Cross-Connects
2.5Gbps Optical Transmitters
Pin Configurations appear at end of data sheet.
Features
♦ 30mA Power-Supply Current ♦ Single +3.3V Power Supply ♦ Up to 2.7Gbps (NRZ) Operation ♦ Automatic Average Power Control with Failure
Monitor
♦ Programmable Modulation Current from 5mA to 60mA
♦ Programmable Bias Current from 1mA to 100mA ♦ Typical Fall Time of 59ps ♦ Selectable Data Retiming Latch ♦ Complies with ANSI, ITU, and Bellcore
SDH/SONET Specifications
Ordering Information
PART
TEMP RANGE PINPACKAGE
PACKAGE CODE
MAX3273EGG
-40°C to +85°C
24 QFN (4mm 4mm)
G2444-1
MAX3273ETG+ -40°C to +85°C
24 Thin QFN (4mm 4mm)
T2444-2
MAX3273E/D -40°C to +85°C Dice*
—
*Dice are designed to operate from TA = -40°C to +85°C, but are tested and guaranteed at TA = +25°C only.
+Denotes lead-free package.
Typical Application Circuit
DATA +
DATA 2.5Gbps SERIALIZER WITH CLOCK GENERATION
CLK+
CLK-
50Ω 100Ω
50Ω
50Ω 100Ω
50Ω
VCC DATA + DATA CLK+
VCC EN LATCH FAIL APCFILT1 APCFILT2
0.01μF
VCC LP1
OUT-
25Ω
MAX3273
OUT+ BIAS
25Ω
LP1
LP2 20Ω
0.056μF
GND MODSET BIASMAX APCSET
CLK- MD
500pF
REPRESENTS A CONTROLLED-IMPEDANCE TRANSMISSION LINE.
†. ________________________________________________________________ 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.
MAX3273
+3.3V, 2.5Gbps Low-Power Laser Driver
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VCC..............................................-0.5V to +6.0V Current into BIAS, OUT+, OUT- ......................-20mA to +150mA Current into MD.....................................................-5mA to +5mA Voltage at DATA+, DATA-, CLK+,
CLK-, LATCH, EN, FAIL..........................-0.5V to (VCC + 0.5V) Voltage at MODSET, BIASMAX,
APCSET, APCFILT1, APCFILT2.........................-0.5V to +3.0V Voltage at BIAS .........................................+1.0V to (VCC + 1.5V) Voltage at OUT+, OUT-.............................+1.5V to (VCC + 1.5V) Current into FAIL ...............................................-10mA to +10mA
Continuous Power Dissipation (TA = +85°C) 24-Pin QFN (derate 274mW/°C above +85°C) ..........1781mW
Storage Temperature Range .............................-55°C to +150°C Operating Junction Temperature ......................-55°C to +150°C Die Attach Temperature (die) ..........................................+400°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
(VCC = +3.14V to +3.6V, TA = -40°C to +85°C. Typical values are at VCC = +3.3V, IBIAS = 60mA, IMOD = 30mA, TA = +25°C, unless otherwise noted.) (Note 1)
PARAMETER Supply Current Bias-Current Range Bias Off-Current
Bias-Current Stability
Bias-Current Absolute Accuracy Differential Input Voltage
SYMBOL
CONDITIONS
ICC Excluding IBIAS and IMOD
IBIAS
Voltage on BIAS pin (VBIAS) = VCC - 1.6V EN = high (Note 2), VBIAS ≤ 2.6V
APC open loop (Note 3) APC open loop (Note 4)
IBIAS = 100mA IBIAS = 1mA
VID Figure 1
Common-Mode Input Voltage
VICM
TTL Input High Voltage TTL Input Low Voltage TTL Output High TTL Output Low MD Voltage Monitor Diode DC-Current Range
Monitor-Diode Bias Set Point Stability
Monitor-Diode Bias Absolute Accuracy
VIH VIL VOH VOL
Sourcing 50µA Sinking 100µA
IMD (Note 3) IMD = 1000µA IMD = 18µA
MIN
1
-15 0.2 VCC 1..