+3.3V, 2.5Gbps Low-Power Transimpedance Amplifier MAX3271 MAX3271

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+3.3V, 2.5Gbps Low-Power Transimpedance Amplifier MAX3271 MAX3271

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19-2105; 11/05
+3.3V, 2.5Gbps Low-Power Transimpedance Amplifier MAX3271
MAX3271 transimpedance amplifier provides compact low-power solution 2.5Gbps communications. features 495nA input-referred noise, 2GHz bandwidth, input overload. MAX3271 compact 30mil 50mil requires external compensation capacitor. operates from single +3.3V supply consumes 83mW. space-saving filter connection provided positive bias photodiode through resistor VCC. These features allow easy assembly into TO-46 TO-56 header with photodiode. MAX3271 typical optical dynamic range -21dBm +3dBm shortwave configuration -24dBm 0dBm longwave configuration. MAX3271 MAX3272* provide two-chip solution Gigabit Ethernet Fibre Channel receiver applications. Single +3.3V Power Supply 83mW Power Consumption 495nA Input-Referred-Noise 2GHz Bandwidth Input Overload 30mil 50mil Size
Features
Applications
Gigabit Ethernet Optical Receivers Fibre Channel Optical Receivers System Interconnects 2.5Gbps Optical Receivers SONET/SDH Receivers
PART MAX3271E/D MAX3271E/W
Ordering Information
TEMP RANGE -40°C +85°C -40°C +85°C PIN-PACKAGE Dice** Wafer**
**Dice/wafers designed operate from -40°C +85°C,
tested guaranteed only +25°C.
Typical Application Circuit
+3.3V
0.1µF
CFILTER 470pF FILTER PHOTODIODE OUT0.1µF OUT+
LIMITING AMPLIFIER
OUT+
0.1µF
OUT-
MAX3271
MAX3272*
*Future product Maxim Integrated Products
pricing, delivery, ordering information, please contact Maxim/Dallas Direct! 1-888-629-4642, visit Maxim's website www.maxim-ic.com.
+3.3V, 2.5Gbps Low-Power Transimpedance Amplifier MAX3271
ABSOLUTE MAXIMUM RATINGS
Power-Supply Voltage (VCC) .-0.5V +6.0V Input Current (IN) .-4mA +4mA FILTER Current .-12mA +12mA Voltage OUT+, OUT- .(VCC 1.5V) (VCC 0.5V) Operating Junction Temperature Range (TJ) .-55°C +150°C Storage Ambient Temperature Range (Tstg) .-55°C +150°C Attach Temperature .+400°C
Stresses beyond those listed under "Absolute Maximum Ratings" cause permanent damage device. These stress ratings only, functional operation device these other conditions beyond those indicated operational sections specifications implied. Exposure absolute maximum rating conditions extended periods affect device reliability.
ELECTRICAL CHARACTERISTICS
(VCC +3.0V +3.6V, -40°C +85°C. Typical values +3.3V, source capacitance 0.85pF, +25°C, unless otherwise noted.) (Notes
PARAMETER Input Bias Voltage Power-Supply Current Transimpedance Small-Signal Bandwidth Output Impedance Maximum Differential Output Swing Filter Resistor Input Overload Input Overload Input-Referred Noise Input-Referred Noise Density Low-Frequency Cutoff Transimpedance Linear Range Deterministic Jitter Power-Supply Noise Rejection PSNR (Note (Note (Note (Note -3dB, input 20µA 0.95 linearity 1.05 (Note (Notes 10µAP-P input 20µAP-P input 2mAP-P 40µAP-P input, differential (Note Single-ended Input 1mAP-P SYMBOL CONDITIONS 0.66 0.83 UNITS mVP-P mAP-P nARMS pA/Hz µAP-P psP-P
100mVP-P, 2MHz (Note
Note Production test room ambient temperature only. parameters guaranteed design characterization -40°C +85°C. Note Source capacitance represents total capacitance during characterization noise bandwidth parameters. Note Guaranteed design characterization. Note Input-referred noise density IN/BW. external filters used noise measurements. Note Deterministic jitter measured with K28.5 pattern (0011 1110 1011 0000 0101). Note Power-supply noise rejection PSNR -20log(VOUT/VCC), where VOUT differential output voltage noise VCC.
+3.3V, 2.5Gbps Low-Power Transimpedance Amplifier MAX3271
Typical Operating Characteristics
(VCC +3.3V, 0.85pF, +25°C, unless otherwise noted.)
INPUT-REFERRED NOISE TEMPERATURE
MAX3271 toc01
FREQUENCY RESPONSE
MAX3271 toc02
DETERMINISTIC JITTER INPUT AMPLITUDE
K28.5 DATA STREAM
MAX3271 toc03
INPUT-REFERRED NOISE (nARMS) 0.85pF 0.5pF SOURCE CAPACITANCE PRESENTED DIE, INCLUDING PACKAGE PARASITIC, DIODE, PARASITIC INTERCONNECT CAPACITANCE
TRANSIMPEDANCE (dB)
DETERMINISTIC JITTER (psP-P)
100M
0.01
JUNCTION TEMPERATURE (°C)
FREQUENCY (Hz)
INPUT AMPLITUDE (mAP-P)
SMALL-SIGNAL TRANSIMPEDANCE TEMPERATURE
MAX3271 toc04
BANDWIDTH TEMPERATURE
MAX3271 toc05
DIAGRAM (INPUT 20µAP-P)
MAX3271 toc06
TRANSIMPEDANCE (dB)
2500 2400 2300 BANDWIDTH (MHz) 2200 2100 2000 1900 1800 1700 1600 1500 1.5pF 1.0pF 0.5pF
9.5mV/div
INPUT: PRBS 57ps/div JUNCTION TEMPERATURE (°C)
JUNCTION TEMPERATURE (°C)
DIAGRAM (INPUT 2mAP-P)
MAX3271 toc07
OUPUT VOLTAGE (mVp-p) -100 -150
53mV/div
INPUT: PRBS 57ps/div
-200 -200 -150 -100 INPUT CURRENT (µA)
MAX3271 toc08
TRANSFER FUNCTION (VFILT
+3.3V, 2.5Gbps Low-Power Transimpedance Amplifier MAX3271
Typical Operating Characteristics (continued)
(VCC +3.3V, 0.85pF, +25°C, unless otherwise noted.)
DIFFERENTIAL OUTPUT REFLECTION COEFFICIENT
MAX3271 toc09
OUTPUT AMPLITUDE TEMPERATURE (INPUT 1mAP-P)
AMPLITUDE (mVP-P)
MAX3271 toc10
(dB) 1000 1500 2000 2500
3000
FREQUENCY (MHz)
JUNCTION TEMPERATURE (°C)
Description
BOND NAME FILTER N.C. OUT+ OUTFUNCTION Provides bias voltage photodiode through resistor VCC. When grounded, this disables DC-cancellation amplifier allow path from OUT+ OUT- testing. Connection. Leave unconnected. Input Power Supply. Both pads must connected supply. Bond supplies power transimpedance stage. Bond supplies power remaining circuitry. Ground. Both pads must connected ground. Bond ground transimpedance stage. Bond ground remaining circuitry. Noninverted Data Output. Current flowing into causes VOUT+ increase. Inverted Data Output. Current flowing into causes VOUT- decrease.
+3.3V, 2.5Gbps Low-Power Transimpedance Amplifier
Detailed Description
MAX3271 transimpedance amplifier designed 2.5Gbps fiber optic applications. functional diagram MAX3271 shown Figure MAX3271 comprised transimpedance amplifier stage, voltage amplifier stage, output buffer, direct current feedback cancellation circuit.
Output Buffer
output buffer provides reverse-terminated voltage output. buffer designed drive differential load between OUT+ OUT-. output current divided between internal resistors external load resistor. Typical Applications Circuit, this creates voltage-divider with gain differential load. MAX3271 also terminated with higher output impedances, which increases gain output voltage swing lowers bandwidth. optimum supply-noise rejection, MAX3271 should terminated with differential load. singleended output required, unused output should similarly terminated. MAX3271 will drive DCcoupled grounded load.
MAX3271
Transimpedance Amplifier Stage
signal current input flows into summing node high-gain amplifier. Shunt feedback through resistor converts this current voltage. parallel with feedback back-to-back Schottky diodes that clamp output signal large input currents shown Figure
Voltage Amplifier Stage
voltage amplifier stage provides gain converts single-ended input differential outputs.
MAX3271
TRANSIMPEDANCE AMPLIFIER VOLTAGE AMPLIFIER OUTPUT BUFFER
OUT+ OUT-
LOWPASS FILTER DISABLE FILTER CANCELLATION CIRCUIT
Figure Functional Diagram
+3.3V, 2.5Gbps Low-Power Transimpedance Amplifier MAX3271
Cancellation Circuit
direct current (DC) cancellation circuit uses lowfrequency feedback remove component input signal. This feature centers input signal within transimpedance amplifier's linear range, thereby reducing pulse-width distortion caused large input signals (Figure cancellation circuit internally compensated therefore does require external capacitors. This circuit minimizes pulse-width distortion data sequences that exhibit mark density. mark density significantly different from will cause MAX3271 generate pulse-width distortion. cancellation current drawn from input creates noise. low-level signals with little component, this problem. Amplifier noise will increase slightly signals with significant component.
Applications Information
Optical Power Relations
Many MAX3271 specifications relate input signal amplitude. When working with fiber optic receivers, input sometimes expressed terms average optical power extinction ratio. Figure shows relations that helpful converting optical power input signal when designing with MAX3271. Optical power relations shown Table definitions true average duty cycle input data 50%.
Optical Sensitivity Calculation
input-referred noise current MAX3271 generally determines receiver sensitivity. obtain system error rate (BER) 1E-12, ratio must always exceed 14.1. input sensitivity, expressed average power, estimated 14.1 Sensitivity 10log 1000 2(re
AMPLITUDE
where photodiode responsivity A/W.
Input Optical Overload
overload largest input that MAX3271 accepts while meeting specifications. optical overload estimated terms average power with following equation: Overload 1000
TIME OUTPUT (SMALL SIGNALS) OUTPUT (LARGE SIGNALS)
Figure MAX3271 Limited Output
AMPLITUDE INPUT FROM PHOTODIODE
OPTICAL POWER
PAVG
TIME INPUT AFTER CANCELLATION
TIME
Figure Cancellation Effect Input
Figure Optical Power Relations
+3.3V, 2.5Gbps Low-Power Transimpedance Amplifier MAX3271
Table Optical Power Relations
PARAMETER Average Power Extinction Ratio Optical Power Optical Power Signal Amplitude SYMBOL PAVG RELATION PAVG P1/P0 2PAVG (re)
PHOTODIODE
CFILT CVCC
VIEW TO-46 HEADER
2PAVG
OUTFILT
OUT+
2PAVG
Optical Linear Range
MAX3271 high gain, which limits output when input signal exceeds 40µAP-P. MAX3271 operates linear range inputs exceeding: 40µA(re Linear Range 10log 1000 2(re
MAX3271
PHOTODIODE MOUNTED CFILT. CASE GROUND.
Figure Suggested Layout TO-56 Header
noise (assuming filter capacitor much larger than photodiode capacitance): INOISE (VNOISE)(CPD) (RFILTER)(CFILTER) amount tolerable noise known, filter capacitor easily selected: CFILTER (VNOISE)(CPD) (RFILTER)(INOISE) example, with maximum noise voltage 100mVP-P, 0.85pF, RFILTER 750, INOISE selected 250nA (1/2 MAX3271's input noise): CFILTER (100mV)(0.85pF) (750)(250nA) 450pF
Layout Considerations
Noise performance bandwidth will adversely affected capacitance pin. Minimize capacitance this select low-capacitance photodiode. Assembling MAX3271 form using chip wire technology provides best possible performance. Figure shows suggested layout header.
Photodiode Filter
Supply voltage noise cathode photodiode produces current V/t, which reduces receiver sensitivity photodiode capacitance.) filter resistor MAX3271, combined with external capacitor, used reduce this noise (see Typical Application Circuit). Current generated supply noise voltage divided between CFILTER CPD. input noise current supply
Wire Bonding
high-current density reliable operation, MAX3271 uses gold metalization. Connections should made with gold wire only, using ballbonding techniques. Wedge bonding recommended. thickness typically 15mils (0.375mm).
+3.3V, 2.5Gbps Low-Power Transimpedance Amplifier MAX3271
Chip Topography
(PAD (PAD
(PAD
OUT+ (PAD
(PAD 0.030" (0.76mm) N.C. (PAD
FILTER (PAD
OUT(PAD
(PAD 0.050" (1.27mm)
Coordinates
PAD# COORDINATES (MILS) 222, 374, 1006, 1006, 226,
Coordinates center pad. Coordinate lower left corner passivation opening
Chip Information
TRANSISTOR COUNT: SUBSTRATE: ELECTRICALLY ISOLATED PROCESS: SiGe BIPOLAR
Maxim cannot assume responsibility circuitry other than circuitry entirely embodied Maxim product. circuit patent licenses implied. Maxim reserves right change circuitry specifications without notice time.
_Maxim Integrated Products, Gabriel Drive, Sunnyvale, 94086 408-737-7600 2005 Maxim Integrated Products Printed registered trademark Maxim Integrated Products, Inc.

+3.3V, 2.5Gbps Low-Power Transimpedance Amplifier MAX3271 MAX3271

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