+3.3V, 10.3Gbps Limiting Amplifier MAX3971 compact, low-power, 10
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19-2086; 5/03
+3.3V, 10.3Gbps Limiting Amplifier
MAX3971 compact, low-power, 10.3Gbps limiting amplifier. accepts signals over wide range input voltage levels provides constant-level output voltages with controlled edge speeds. functions data quantizer. output amplifier 250mVP-P differential signal with differential termination. MAX3971 designed work with MAX3970, 10.3Gbps transimpedance amplifier (TIA). limiting amplifier operates single +3.3V supply consumes only 155mW. part functions over +85°C temperature range. also disable function that allows outputs squelched required application. MAX3971 offered form compact 4mm, 20-pin plastic package.
_Features
Single +3.3V Power Supply 155mW Power Consumption 9.5mVP-P Input Sensitivity 800mVP-P Input Overload 3.4psP-P Deterministic Jitter Dice Packages Output Disable Feature
MAX3971
Applications
10-Gigabit Ethernet Optical Receivers OC-192 Receivers 10-Gigabit Fibre Channel Receivers
PART MAX3971UGP MAX3971U/D
Ordering Information
TEMP. RANGE PIN-PACKAGE +85°C +85°C Dice* CODE G2044-4
*Dice designed operate over +110°C junction temperature (TJ) range, tested guaranteed +25°C. Configuration appears data sheet.
Typical Application Circuit
+3.3V 0.1µF +3.3V CZGNDIN+ 0.1µF INGNDINOUTOUT+ 0.1µF SUPPLY FILTER VCC1 VCC2 VCC3
0.1µF
0.1µF
MAX3970 MAX3971
DISABLE
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, 10.3Gbps Limiting Amplifier MAX3971
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VCC1, VCC2, VCC3 .-0.5V +0.5V Voltage IN+, IN-, DISABLE, CZ+, CZ-, OUT+, OUT-.+0.5V (VCC 0.5V) Differential Voltage Between .±1V Differential Voltage Between IN-.±2.5V Continuous Power Dissipation +85°C) 20-Lead (derate 20mW/°C above +85°C) .1.3W Operating Ambient Temperature Range .-40°C +85°C Storage Temperature Range .-55°C +150°C Attach Temperature.+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 CHARACTERISTICS
(VCC +3.0V +3.6V, +85°C. Typical values +3.3V, output load VCC, +25°C, unless otherwise noted. Data mark density 50%.)
PARAMETER Supply Current Small-Signal Bandwidth Low-Frequency Cutoff Data Rate 10mVP-P input, K28.5 pattern 10.3Gbps (Note Deterministic Jitter 20mVP-P input, K28.5 pattern 10.3Gbps (Note 800mVP-P input, K28.5 pattern 10.3Gbps (Note Random Jitter Transition Time, Output Input Sensitivity Input Overload Data Input Resistance Differential Data Output-Voltage Swing Data Output Common-Mode Voltage Output Resistance Data Output Offset when DISABLE High DISABLE Input Current DISABLE Input High Voltage DISABLE Input Voltage High VCC, VIN-min VIN-max VOD1 VOD2 ROUT Single-ended Single-ended DISABLE high DISABLE 20mVP-P 800mVP-P (Note 80%, OUT+, OUTBER 1E-12, 1PRBS, 10.3Gbps 0.75 0.05 SYMBOL 0.1µF CONDITIONS psRMS mVP-P mVP-P mVP-P mVP-P psP-P UNITS Gbps
Note Note
Deterministic jitter measured with K28.5 pattern (0011 1110 1011 0000 0101). peak-to-peak deviation from ideal time crossings, measured zero-level crossings differential output. Random jitter measured with minimum input signal applied. achieve error rate 10-12, peak-to-peak random jitter 14.1 times random jitter.
+3.3V, 10.3Gbps Limiting Amplifier
Typical Operating Characteristics
(VCC +3.3V, output load VCC, +25°C, unless otherwise noted.)
OUTPUT DIAGRAM (INPUT SIGNAL 800mVP-P 10.3Gbps)
MAX3971 toc02
MAX3971
SUPPLY CURRENT TEMPERATURE
MAX3971 toc01
OUTPUT DIAGRAM (INPUT SIGNAL 9mVP-P 10.3Gbps)
MAX3971 toc03
SUPPLY CURRENT (mA)
50mV/div
50mV/div
20ps/div
20ps/div
TEMPERATURE (°C)
TRANSITION TIME TEMPERATURE (20% 80%)
MAX3971 toc04
DETERMINISTIC JITTER TEMPERATURE (800mVP-P INPUT K28.5 PATTERN 10.3Gbps)
MAX3971 toc05
DETERMINISTIC JITTER TEMPERATURE (10mVP-P INPUT K28.5 PATTERN 10.3Gbps)
+3.0V +3.6V
MAX3971 toc06
+3.0V, INPUT 800mVP-P +3.6V, INPUT 800mVP-P
+3.0V +3.6V
JITTER (psP-P)
JITTER (psP-P)
TIME (ps)
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
INPUT SENSITIVITY TEMPERATURE (FOR BIT-ERROR RATIO 1E-12)
MAX3971 toc07
INPUT RETURN (S11) INPUT SIGNAL -20dBm
MAX3971 toc08
OUTPUT RETURN (S22) INPUT SIGNAL -20dBm
MAX3971 toc09
GAIN (dB)
SIGNAL INPUT LEVEL (mVP-P)
GAIN (dB)
TEMPERATURE (°C) 2100 4100 6100 FREQUENCY (MHz) 8100 10,100
2100
4100 6100 FREQUENCY (MHz)
8100
10,100
+3.3V, 10.3Gbps Limiting Amplifier MAX3971
Typical Operating Characteristics (continued)
(VCC +3.3V, output load VCC, +25°C, unless otherwise noted.)
POWER-SUPPLY REJECTION RATIO FREQUENCY
MAX3971 toc10
COMMON-MODE REJECTION RATIO FREQUENCY
MAX3971 toc11
PSRR (dB)
CMMR (dB)
1000
FREQUENCY (MHz)
1000
10,000
FREQUENCY (MHz)
Description
NAME GNDIN+ INGNDINN.C. VCC3 OUTOUT+ DISABLE VCC2 CZVCC1 Exposed FUNCTION Input Ground Shielding Input Signal IN+. connected internally. Noninverting Input Signal Inverting Input Signal Input Ground Shielding Input Signal IN-. connected internally. Connection. Leave unconnected. Ground Output Circuitry Power Supply Inverting Output Amplifier Noninverting Output Amplifier When High, Outputs Disabled Power Supply Circuitry Other than Input Output Circuits Filter Capacitor Offset Correction. Attach other side capacitor Detailed Description. Input Circuitry Power Supply Exposed Pad. Must soldered supply ground proper electrical thermal operation.
+3.3V, 10.3Gbps Limiting Amplifier
Detailed Description Applications Information
Figure functional diagram MAX3971 limiting amplifier.The signal path consists input buffer followed gain stage output amplifier. feedback loop provides offset correction driving average value differential output zero. product equivalent on-chip resistor value off-chip capacitor, stable operation, minimum value 0.01µF. minimize pattern-dependent jitter, should large possible. 10-Gigabit Ethernet applications, typical value 0.1µF. Keep close package possible.
MAX3971
Input Circuit
input buffer designed accept input signals such output from MAX3970 transimpedance amplifier. equivalent circuit input shown Figure DC-coupling inputs recommended because doing prevents part's offset correction circuitry from working properly. Thus, ACcoupling capacitors required input.
Gain Stage Offset Correction
limiting amplifier provides approximately 50dB gain. This large gain makes amplifier susceptible small offsets, which cause deterministic jitter. low-frequency loop integrated into limiting amplifier reduce output offset, typically less than 2mV. external capacitor required low-frequency cutoff offset correction loop stability. time constant loop
Output Circuit
equivalent circuit output network shown Figure consists resistors connected driven collectors output differential transistor pair Q2). differential output signals clamped transistors when DISABLE input high.
DISABLE
MAX3971
GNDIN+ INPUT AMPLIFIER
OFFSET CORRECTION
LOWPASS FILTER
Disable Function
logic signal applied DISABLE squelch output signal. When output disabled, offset added output, preventing following stage from oscillating DC-coupled).
OUT+ GAIN 50dB OUTPUT AMPLIFIER
OUT-
GNDIN-
Figure Functional Diagram
VCC1 VCC3
GNDIN+
OUT+ OUT-
DISABLE
INGNDINDATA
STRUCTURES
STRUCTURES
Figure Input Equivalent Circuit
Figure Input Equivalent Circuit Showing Clamping Circuit Squelching Output Signal
+3.3V, 10.3Gbps Limiting Amplifier MAX3971
Layout Considerations
Circuit board layout design significantly affect MAX3971's performance. good high-frequency techniques, including fixed-impedance transmission lines high-frequency data signal. multilayer board with solid ground plane. Minimize inductance between MAX3971 ground plane. MAX3971 uses three power supply pins (VCC1, VCC2, VCC3). input circuitry MAX3971 supplied VCC1. output drivers have separate supply (VCC3), which usually large pulsing currents. other circuitry powered VCC2. possible simply connect three pins together. However, better isolation input circuitry ensured using supply filter. optimal isolation, Figure shows possible supply filtering circuit. Element ferrite bead, provides isolation between noisy VCC3 sensitive VCC1.
+3.3V
SUPPLY FILTER
0.001µF
0.001µF
0.001µF
VCC1
VCC2
VCC3
MAX3971
Figure Power-Supply Filter
Configuration
DISABLE VCC1 VCC2
Chip Information
TRANSISTOR COUNT: 1803 PROCCESS: SiGe Bipolar SUBSTRATE: Electrically Isolated
VCC3 OUT+
GNDIN+ INGNDINN.C.
MAX3971
OUT12 VCC3
N.C.
N.C.
N.C.
+3.3V, 10.3Gbps Limiting Amplifier
Chip Topography
VCC1 CZCZ+ VCC2 DISABLE
MAX3971
GNDIN+
VCC3
OUT+
OUT0.045" (1.15mm)
GNDIN-
VCC3
N.C.
N.C.
0.049" (1.25mm)
N.C.
N.C.
+3.3V, 10.3Gbps Limiting Amplifier MAX3971
Chip Topography (continued)
MAX3971 NUMBER DIMENSION (MICRONS) 163.8 289.8 415.8 541.8 667.8 884.8 884.8 884.8 884.8 884.8 667.8 541.8 415.8 289.8 163.8 DIMENSION (MICRONS) 772.8 772.8 772.8 772.8 772.8
(0,0)
dimensions microns. dimensions: PASSIVATION OPENING: 94.4 microns 94.4 microns METAL: 102.4 microns 102.4 microns
measurements specify lower left corner
MAX3971
+3.3V, 10.3Gbps Limiting Amplifier
Package Information
(The package drawing(s) this data sheet reflect most current specifications. latest package outline information www.maxim-ic.com/packages.)
MAX3971
PACKAGE OUTLINE 12,16,20,24L QFN, 4x4x0.90
21-0106
12,16,20, QFN.EPS
+3.3V, 10.3Gbps Limiting Amplifier MAX3971
Package Information (continued)
(The package drawing(s) this data sheet reflect most current specifications. latest package outline information www.maxim-ic.com/packages.)
PACKAGE OUTLINE 12,16,20,24L QFN, 4x4x0.90
21-0106
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 2004 Maxim Integrated Products Printed registered trademark Maxim Integrated Products.
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