1.25Gbps/2.5Gbps, +5.5V, Low-Noise Transimpedance Preamplifiers LANs
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19-4796; 6/00
1.25Gbps/2.5Gbps, +5.5V, Low-Noise Transimpedance Preamplifiers LANs
MAX3266 transimpedance preamplifier 1.25Gbps local area network (LAN) fiber optic receivers. circuit features 200nA input-referred noise, 920MHz bandwidth, input overload. MAX3267 provides pin-for-pin compatible solution communications 2.5Gbps. features 500nA input-referred noise, 1.9GHz bandwidth, input overload. Both devices operate from +3.0V +5.5V single supply require compensation capacitor. They also include space-saving filter connection that provides positive bias photodiode through 1.5k resistor VCC. These features allow easy assembly into TO-46 TO-56 header with photodiode. 1.25Gbps MAX3266 typical optical dynamic range -24dBm 0dBm shortwave (850nm) configuration -27dBm -3dBm longwave (1300nm) configuration. 2.5Gbps MAX3267 typical optical dynamic range -21dBm 0dBm shortwave configuration -24dBm -3dBm longwave configuration.
Features
200nA Input-Referred Noise (MAX3266) 500nA Input-Referred Noise (MAX3267) 920MHz Bandwidth (MAX3266) 1900MHz Bandwidth (MAX3267) Input Overload +3.0V +5.5V Single-Supply Voltage
MAX3266/MAX3267
Ordering Information
PART MAX3266CSA MAX3266C/D MAX3267CSA MAX3267C/D MAX3267ESA MAX3267E/D TEMP. RANGE +70°C +70°C -40°C +85°C PIN-PACKAGE Dice* Dice* Dice*
*Dice designed operate over -40°C +140°C junction temperature (Tj) range, tested guaranteed +25°C.
Configuration
VIEW
OUT+ OUTGND
Applications
Gigabit Ethernet 1Gbps 2.5Gbps Optical Receivers Fibre Channel
N.C.
MAX3266 MAX3267
FILTER
Typical Application Circuit
0.01µF 1.5k CFILTER 400pF FILTER PHOTODIODE OUT+ OUT-
0.1µF
MAX3266 MAX3267
0.1µF
LIMITING AMPLIFIER
Maxim Integrated Products
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1.25Gbps/2.5Gbps, +5.5V, Low-Noise Transimpedance Preamplifiers LANs MAX3266/MAX3267
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VCC GND) .-0.5V +6.0V Current.-4mA +4mA FILTER Current.-8mA +8mA Voltage OUT+, OUT- .(VCC 1.5V) (VCC 0.5V) Continuous Power Dissipation +70°C) 8-Pin (derate 6.7mW/°C above +70°C).533mW Storage Temperature Range .-55°C +150°C Operating Junction Temperature (die) .-55°C +150°C Processing Temperature (die) .+400°C Lead Temperature (soldering, 10s) .+300°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
(VCC +3.0V +5.5V, +70°C, load between OUT+ OUT-. Typical values +25°C, 3.3V, source capacitance 0.85pF, unless otherwise noted.) (Note PARAMETER Input Bias Voltage Supply Current Transimpedance Output Impedance Maximum Differential Output Voltage Filter Resistor Input Overload Input Overload Die, packaged TO-56 header (Note Input-Referred Noise package (Note Input-Referred Noise Density Small-Signal Bandwidth Low-Frequency Cutoff Transimpedance Linear Range Deterministic Jitter Power-Supply Rejection Ratio (PSRR) (Note MAX3266 MAX3267 -3dB, input 20µA Peak-to-peak, 0.95 linearity 1.05 (Note MAX3266 MAX3267 MAX3266 MAX3267 MAX3266 MAX3266 MAX3267 MAX3266 MAX3267 1530 Differential, measured with 30µAp-p signal (40µAp-p MAX3267) Single ended (per side) Input 1mAp-p MAX3266 MAX3267 2260 1540 1220 0.65 11.0 1900 1100 2420 pA/(Hz)1/2 µAp-p CONDITIONS 0.69 0.83 2800 1900 1500 0.91 3400 2330 1860 mVp-p mAp-p UNITS
Output referred, 2MHz, PSRR -20log (VOUT/VCC)
1.25Gbps/2.5Gbps, +5.5V, Low-Noise Transimpedance Preamplifiers LANs
ELECTRICAL CHARACTERISTICS-MAX3267E
(VCC +3.0V +5.5V, -40°C +85°C, load between OUT+ OUT-. Typical values +25°C, 3.3V, source capacitance 0.85pF, unless otherwise noted.) (Note PARAMETER Input Bias Voltage Supply Current Transimpedance Output Impedance Maximum Differential Output Voltage Filter Resistor Input Overload Input Overload Input-Referred Noise Input-Referred Noise Density Small-Signal Bandwidth Low-Frequency Cutoff Transimpedance Linear Range Deterministic Jitter Power-Supply Rejection Ratio (PSRR) -3dB, input 20µA Peak-to-peak, 0.95 linearity 1.05 (Note Output referred, 2MHz, PSRR -20log (VOUT/VCC) package (Note (Note 1515 Differential, measured with 40µAp-p signal Single ended (per side) Input 1mAp-p 1470 47.7 1210 0.65 11.0 1900 2550 CONDITIONS 0.67 0.83 1900 1500 0.97 53.2 2355 52.1 1865 UNITS mVp-p mAp-p pA/(Hz)1/2 µAp-p
MAX3266/MAX3267
Note Source Capacitance represents total capacitance during characterization noise bandwidth parameters. Figure shows typical source capacitance reverse voltage photodiode used during characterization TO-56 header packages. Noise bandwidth will affected source capacitance. Typical Operating Characteristics more information. Note Input-Referred Noise calculated Output Noise (Gain 10MHz). Noise Density (Input-Referred Noise) bandwidth. external filters used noise measurements. Note Deterministic Jitter measured with K28.5 pattern applied input [00111110101100000101].
1.25Gbps/2.5Gbps, +5.5V, Low-Noise Transimpedance Preamplifiers LANs MAX3266/MAX3267
Typical Operating Characteristics
(VCC +3.3V, +25°C, MAX3266/MAX3267 kit, source capacitance 0.85pF, unless otherwise noted.)
MAX3266 INPUT-REFERRED NOISE TEMPERATURE
MAX3266/67-01
MAX3267 INPUT-REFERRED NOISE TEMPERATURE
MAX3266/67-02
FREQUENCY RESPONSE
MAX3266 TRANSIMPEDANCE (dB)
MAX3266/67-03
INPUT-REFERRED NOISE (nA)
INPUT-REFERRED NOISE (nA)
SOURCE CAPACITANCE PRESENTED DIE, INCLUDING PACKAGE PARASITIC, DIODE, PARASITIC INTERCONNECT CAPACITANCE.
SOURCE CAPACITANCE PRESENTED DIE, INCLUDING PACKAGE PARASITIC, DIODE, PARASITIC INTERCONNECT CAPACITANCE.
MAX3267
1.0pF 1.5pF
0.5pF
1.5pF 1.0pF
0.5pF
100M FREQUENCY (Hz) JUNCTION TEMPERATURE (°C)
JUNCTION TEMPERATURE (°C)
DETERMINISTIC JITTER INPUT AMPLITUDE
MAX3266/67-04
INPUT-REFERRED NOISE CURRENT INPUT CURRENT
MAX3266/67-05
SMALL-SIGNAL TRANSIMPEDANCE TEMPERATURE
TRANSIMPEDANCE (dB) MAX3267 MAX3266
MAX3266/67-06
PEAK-TO-PEAK JITTER (ps) MAX3266 PEAK-TO-PEAK AMPLITUDE (µA) MAX3267
1000 INPUT-REFERRED NOISE (nA) MAX3266 MAX3267
1000 AMBIENT TEMPERATURE (°C)
1000
DIFFERENTIAL INPUT CURRENT (µA)
MAX3266 BANDWIDTH TEMPERATURE
MAX3266/67-07
MAX3267 BANDWIDTH TEMPERATURE
MAX3266/67-08
OUTPUT AMPLITUDE TEMPERATURE
MAX3266/67-09
1090 1040 BANDWIDTH (MHz)
BANDWIDTH (MHz)
AMPLITUDE (mV)
SOURCE CAPACITANCE PRESENTED DIE, INCLUDING PACKAGE PARASITIC, DIODE, PARASITIC INTERCONNECT CAPACITANCE.
2400
SOURCE CAPACITANCE 2300 PRESENTED DIE, INCLUDING PACKAGE PARASITIC, DIODE, 2200 PARASITIC INTERCONNECT CAPACITANCE. 2100 0.5pF 2000 1900 1800 1700 1.0pF 1.5pF JUNCTION TEMPERATURE (°C)
0.5pF JUNCTION TEMPERATURE (°C) 1.0pF
1.5pF
1600 1500
AMBIENT TEMPERATURE (°C)
1.25Gbps/2.5Gbps, +5.5V, Low-Noise Transimpedance Preamplifiers LANs MAX3266/MAX3267
Typical Operating Characteristics (continued)
(VCC +3.3V, +25°C, MAX3266/MAX3267 kit, source capacitance 0.85pF, unless otherwise noted.)
DIAGRAM (INPUT 10µAp-p)
MAX3266/67-10
DIAGRAM (INPUT 1mAp-p)
MAX3266/67-11
DIAGRAM (INPUT 20µAp-p)
INPUT: 27-1 PRBS
MAX3266/67-12
4mV/div
30mV/div
5mV/div
INPUT: 27-1 PRBS 160ps/div
INPUT: 27-1 PRBS 160ps/div 80ps/div
DIAGRAM (INPUT 1mAp-p)
INPUT: 27-1 PRBS
MAX3266/67-13
TRANSFER FUNCTION
MAX3266/67-14
OUTPUT VOLTAGE (mVp-p) MAX3266 -100 -150 MAX3267
30mV/div
80ps/div
-200 -150 -100
INPUT CURRENT (µA)
Description
NAME N.C. FILTER OUTOUT+ Supply Voltage Connection. internally connected. Amplifier Input Provides bias voltage photodiode through 1.5k resistor VCC. When grounded, this disables Cancellation Amplifier allow path from OUT+ OUT- testing. Ground Inverting Output. Current flowing into causes VOUT- decrease. Noninverting Output. Current flowing into causes VOUT+ increase. Ground FUNCTION
1.25Gbps/2.5Gbps, +5.5V, Low-Noise Transimpedance Preamplifiers LANs MAX3266/MAX3267
Detailed Description
MAX3266 transimpedance amplifier designed 1.25Gbps fiber optic applications. Figure functional diagram MAX3266, which comprises transimpedance amplifier, voltage amplifier, output buffer, output filter, cancellation circuit. MAX3267, transimpedance amplifier designed 2.5Gbps fiber optic applications, shares similar architecture with MAX3266.
MAX3266/67 fig01
Transimpedance Amplifier
signal current input flows into summing node high-gain amplifier. Shunt feedback through converts this current voltage with gain approximately 2.2k (1.0k MAX3267). Schottky diodes clamp output voltage large input currents, shown Figure
Voltage Amplifier
voltage amplifier converts single-ended signals differential signals introduces voltage gain.
2.00 1.85 1.70 CAPACITANCE (pF) 1.55 1.40 1.25 1.10 0.95 0.80 0.65 0.50 REVERSE BIAS
Output Buffer
output buffer provides reverse-terminated voltage output. buffer designed drive differential load between OUT+ OUT-. output current divided between internal load resistors external load resistor. typical operating circuit, this creates voltage-divider with gain 1/2. MAX3266 also terminated with higher output impedances, which increases gain output voltage swing. optimum supply-noise rejection, MAX3266 should terminated with differential load. singleended output required, unused output should similarly terminated. MAX3266 will drive DCcoupled, grounded load.
Figure Typical Photodiode Capacitance Bias Voltage
MAX3266
TRANSIMPEDANCE AMPLIFIER VOLTAGE AMPLIFIER OUTPUT BUFFER OUTPUT FILTER OUT+ OUT-
LOWPASS FILTER DISABLE 1.5k FILTER CANCELLATION CIRCUIT
Figure MAX3266 Functional Diagram
1.25Gbps/2.5Gbps, +5.5V, Low-Noise Transimpedance Preamplifiers LANs MAX3266/MAX3267
AMPLITUDE AMPLITUDE INPUT FROM PHOTODIODE
TIME TIME OUTPUT (SMALL SIGNALS) OUTPUT (LARGE SIGNALS) INPUT (AFTER CANCELLATION)
Figure MAX3266 Limited Output
Figure Cancellation Effect Input
Output Filter
MAX3266 includes one-pole lowpass filter that limits circuit bandwidth improves noise performance.
relations that helpful converting optical power input signal when designing with MAX3266. Optical power relations shown Table definitions true average duty cycle input data 50%.
Cancellation Circuit
cancellation circuit uses low-frequency feedback remove component input signal (Figure This feature centers input signal within transimpedance amplifier's linear range, thereby reducing pulse-width distortion large input signals. cancellation circuit internally compensated therefore does require external capacitors. This circuit minimizes pulse-width distortion data sequences that exhibit duty cycle. duty cycle significantly different from will cause MAX3266 generate pulse-width distortion. cancellation current drawn from input creates noise. low-level signals with little component, this problem. Amplifier noise will increase signals with significant component (see Typical Operating Characteristics).
Optical Sensitivity Calculation
input-referred noise current MAX3266 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 1000 Sensitivity
Where photodiode responsivity A/W.
Input Optical Overload
overload largest input that MAX3266 accepts while meeting specifications. optical overload estimated terms average power with following equation: Overload 1000
Applications Information
Optical Power Relations
Many MAX3266 specifications relate input signal amplitude. When working with fiber optic receivers, input usually expressed terms average optical power extinction ratio. Figure shows
1.25Gbps/2.5Gbps, +5.5V, Low-Noise Transimpedance Preamplifiers LANs MAX3266/MAX3267
PAVG
TIME
Figure Optical Power Relations
Noise performance bandwidth will adversely affected capacitance pin. Minimize capacitance this select low-capacitance photodiode. Assembling MAX3266 form using chip wire technology provides best possible performance. Figure shows suggested layout header. package version MAX3266 offered easy characterize circuit become familiar with circuit's operation, does offer optimum performance. When using version MAX3266, package capacitance adds approximately 0.3pF input. board between MAX3266 input photodiode also adds parasitic capacitance. Keep input line short, remove power ground planes beneath
OPTICAL POWER
Table Optical Power Relations
PARAMETER Average Power Extinction Ratio Optical Power Optical Power Signal Amplitude SYMBOL PAVG RELATION PAVG P1/P0 2PAVG (re)
Photodiode Filter
Supply voltage noise cathode photodiode produces current V/t, which reduces receiver sensitivity photodiode capacitance.) filter resistor MAX3266, 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 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)
2PAVG
2PAVG (re)
Optical Linear Range
MAX3266 high gain, which limits output when input signal exceeds 30µAp-p (40µAp-p MAX3267). MAX3266 operates linear range inputs exceeding: 30µA 1000 Linear Range 10log
example, with maximum noise voltage 100mVp-p, 0.85pF, RFILTER 1.5k, INOISE selected 100nA (1/2 MAX3266's input noise): CFILTER (100mV)(0.85pF) (1500)(100nA) 570pF
Wire Bonding
high current density reliable operation, MAX3266 uses gold metalization. Connections should made with gold wire only, using ballbonding techniques. Wedge bonding recommended. thickness typically 15mils (0.375mm).
Layout Considerations
good high-frequency design layout techniques. multilayer circuit board with separate ground power planes recommended. Connect pins ground plane with shortest possible traces.
1.25Gbps/2.5Gbps, +5.5V, Low-Noise Transimpedance Preamplifiers LANs MAX3266/MAX3267
VIEW TO-56 HEADER
CFILTER
PHOTODIODE
OUT-
OUT+
MAX3266/MAX3267 CASE GROUND
Figure Suggested Layout TO-56 Header
Chip Topographies
MAX3266
FILTER INPUT FILTER
MAX3267
INPUT
0.050" (1.25mm)
0.050" (1.25mm)
OUT-
OUT+
OUT-
OUT+
0.030" (0.75mm)
0.030" (0.75mm)
TRANSISTOR COUNT: SUBSTRATE CONNECTED
1.25Gbps/2.5Gbps, +5.5V, Low-Noise Transimpedance Preamplifiers LANs MAX3266/MAX3267
Package Information
SOICN.EPS
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 2000 Maxim Integrated Products Printed registered trademark Maxim Integrated Products.
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