250MHz, Low-Power, High-Output-Current, Differential Line Driver

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250MHz, Low-Power, High-Output-Current, Differential Line Driver

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19-4763; 7/98
250MHz, Low-Power, High-Output-Current, Differential Line Driver
General Description _Features
250MHz -3dB Bandwidth +2V/V) 1400V/µs Slew Rate 67dB 10MHz 0.01%/0.01° Differential Gain/Phase Differentially into Output Drive Shutdown Capability 12.5mA Quiescent Supply Current Available 14-Pin Narrow Package
MAX4142
MAX4142 differential line driver combines highspeed performance with fully symmetrical differential inputs outputs. With internally +2V/V closedloop gain, MAX4142 ideal driving backterminated cables transmission lines. This device utilizes laser-trimmed thin-film resistors common-mode cancellation circuitry deliver outstanding 67dB 10MHz common-mode rejection (CMR). Using current-feedback techniques, MAX4142 achieves 250MHz -3dB +2V/V) bandwidth, 70MHz 0.1dB bandwidth, 1400V/µs slew rate. Excellent differential gain/phase error noise specifications make this amplifier excellent choice wide variety video signal-processing applications. MAX4142 operates from power supplies requires only 12.5mA quiescent current. output stage capable driving load (differentially) (single-ended). MAX4142 available space-saving 14-pin package. pin-compatible, higher speed differential line driver, MAX4147 data sheet.
Ordering Information
PART MAX4142ESD TEMP. RANGE -40°C +85°C PIN-PACKAGE
Configuration
VIEW
N.C.
_Applications
Video Twisted-Pair Driver Differential Pulse Amplifier High-Speed Instrumentation Amplifier Low-Noise Differential Receivers Differential Driver
MAX4142
OUT+ SENSE+ SENSE9 OUTVCC
SHDN N.C.
N.C. INTERNALLY CONNECTED
Typical Application Circuit
SENSE+ OUT+
SENSE IN75 COAX VOUT
MAX4142
INSENSE-
OUTIN+
MAX4144
TWISTED-PAIR COAX-CABLE CONVERTER
Maxim Integrated Products
free samples latest literature: http://www.maxim-ic.com, phone 1-800-998-8800. small orders, phone 408-737-7600 ext. 3468.
250MHz, Low-Power, High-Output-Current, Differential Line Driver MAX4142
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VCC VEE).+12V Voltage Ground.(VEE 0.3V) (VCC 0.3V) Input Current (IN_).±10mA Short-Circuit Duration (VOUT GND) .10sec Continuous Power Dissipation +70°C) Plastic (derate 8.3mW/°C above +70°C) .667mW Operating Temperature Range .-40°C +85°C Storage Temperature Range .-65°C +150°C Lead Temperature (soldering, 10sec) .+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 +5V, -5V, SHDN TMIN TMAX, unless otherwise noted. Typical values specified +25°C.) PARAMETER Operating Supply Voltage Input Offset Voltage Input Offset Voltage Drift Input Bias Current Input Offset Current Input Capacitance Differential Input Resistance Differential Input Voltage Range Common-Mode Input Voltage Range Gain Gain Error Gain Drift Common-Mode Rejection Power-Supply Rejection Quiescent Supply Current Shutdown Supply Current ICC, ICC, SHDN TCVOS Guaranteed output voltage swing test Guaranteed test VOUT VOUT ±1.7V ±4.5V ±5.5V VSHDN Single-ended, Output Voltage Swing Differential, Single-ended, 26.5 Differential, Output Current Drive Output Resistance SHDN Logic-High Threshold SHDN Logic-Low Threshold Enable Time from Shutdown Disable Time Shutdown SHDN Input Current IOUT ROUT tOFF ISHDN VSHDN -3.0 -1.7 12.5 SYMBOL CONDITIONS Guaranteed test ±4.5 ±5.5 UNITS µV/°C ppm/°C
VOUT
250MHz, Low-Power, High-Output-Current, Differential Line Driver
ELECTRICAL CHARACTERISTICS
(VCC +5V, -5V, SHDN differential, CONDITIONSTMAX, unless otherwise noted. Typical values specified TMIN PARAMETER SYMBOL UNITS T-3dB+25°C.) Bandwidth BW(-3dB) VOUT 0.1VRMS Full-Power Bandwidth FPBW VOUT 2Vp-p 0.1dB Bandwidth Common-Mode Rejection Slew Rate Settling Time Differential Gain Differential Phase Input Voltage Noise Input Current Noise Spurious-Free Dynamic Range BW(0.1dB) SFDR VOUT 0.1VRMS 10MHz, Differential, VOUT VOUT 3.58MHz 3.58MHz 10kHz 1MHz 100MHz 10kHz 1MHz 100MHz 500kHz, VOUT 1Vp-p, Figure1 10MHz, VOUT 1Vp-p, Figure1 0.1% 0.01% 1400 0.01 0.01 V/µs degrees nV/Hz µVRMS pAHz nARMS
MAX4142
_Typical Operating Characteristics
(VCC +5V, -5V, SHDN differential, +25°C, unless otherwise noted.)
SMALL-SIGNAL GAIN FREQUENCY
MAX4142-01
GAIN FLATNESS FREQUENCY
MAX4142-02
LARGE-SIGNAL GAIN FREQUENCY
GAIN (dB) VOUT 2Vp-p
MAX4142-03
GAIN (dB) VOUT 100mVp-p
GAIN (dB) VOUT 100mVp-p
FREQUENCY (MHz) 1000
FREQUENCY (MHz)
1000
FREQUENCY (MHz)
1000
250MHz, Low-Power, High-Output-Current, Differential Line Driver MAX4142
_Typical Operating Characteristics (continued)
(VCC +5V, -5V, SHDN differential, +25°C, unless otherwise noted.)
POWER-SUPPLY REJECTION FREQUENCY
MAX4142-04
COMMON-MODE REJECTION FREQUENCY
MAX4142-05
OUTPUT IMPEDANCE FREQUENCY
MAX4142-06
(dB)
1000
(dB)
FREQUENCY (MHz)
OUTPUT IMPEDANCE FREQUENCY (MHz) 1000
0.01 FREQUENCY (MHz)
VOLTAGE-NOISE DENSITY FREQUENCY
MAX4142-07
CURRENT-NOISE DENSITY FREQUENCY
MAX4142-08
HARMONIC DISTORTION FREQUENCY
DISTORTION (dBc) HARMONIC HARMONIC VOUT 1Vp-p
MAX4142-09
VOLTAGE-NOISE DENSITY (nV/Hz)
CURRENT-NOISE DENSITY (pA/Hz)
100k FREQUENCY (Hz)
100k FREQUENCY (Hz)
FREQUENCY (MHz)
DISTORTION LOAD
MAX4142-10
HARMONIC DISTORTION OUTPUT VOLTAGE SWING
MAX4142-11
DIFFERENTIAL GAIN PHASE
DIFF. GAIN 0.010 0.005 0.000 -0.005 DIFF. PHASE (deg)
MAX4142-12
DISTORTION (dBc) -100 1000 ORDER HARMONIC 5MHz, VOUT 1Vp-p
DISTORTION (dBc) -100
0.015
5MHz
HARMONIC 0.010 0.005 0.000 -0.005 HARMONIC
ORDER HARMONIC
1200
RESISTIVE LOAD
OUTPUT VOLTAGE SWING (Vp-p)
250MHz, Low-Power, High-Output-Current, Differential Line Driver
_Typical Operating Characteristics (continued)
(VCC +5V, -5V, SHDN differential, +25°C, unless otherwise noted.)
DIFFERENTIAL OUTPUT SWING LOAD RESISTANCE
MAX4142-13
MAX4142
DIFFERENTIAL OUTPUT VOLTAGE SWING TEMPERATURE
MAX4142-14
INPUT OFFSET VOLTAGE TEMPERATURE
INPUT OFFSET VOLTAGE (mV))
MAX4142-15
OUTPUT SWING (Vp-p)
DIFFERENTIAL OUTPUT VOLTAGE SWING DIFFERENTIAL
TEMPERATURE (°C) TEMPERATURE (°C)
LOAD RESISTANCE
INPUT BIAS CURRENT TEMPERATURE
INPUT BIAS CURRENT (µA) TEMPERATURE (°C)
MAX4142-16
INPUT OFFSET CURRENT TEMPERATURE
MAX4142-17
POWER-SUPPLY CURRENT TEMPERATURE
14.5 POWER-SUPPLY CURRENT (mA) 14.0 13.5 13.0 12.5 12.0 11.5 11.0 10.5 10.0
MAX4142-18
INPUT OFFSET CURRENT (µA)
15.0
TEMPERATURE (°C)
TEMPERATURE (°C)
SMALL-SIGNAL PULSE RESPONSE
MAX4142-19
LARGE-SIGNAL PULSE RESPONSE
MAX4142-20
ENABLE RESPONSE TIME
MAX4142-21
VOLTAGE (500mV/div) VOLTAGE (25mV/div) SHDN
VOUT
TIME (10ns/div)
TIME (10ns/div)
TIME (2µs/div)
250MHz, Low-Power, High-Output-Current, Differential Line Driver MAX4142
_Pin Description
NAME N.C. SHDN INVCC OUTSENSEGND SENSE+ OUT+ FUNCTION
Negative Power Supply. Connect -5V. Noninverting Input Connect. internally connected. Logic Input Shutdown Circuitry. logic enables amplifier. logic high disables amplifier. Inverting Input Positive Power Supply. Connect +5V. Inverting Output Inverting Output Sense. Connect OUTclose normal operation. Ground Noninverting Output Sense. Connect OUT+ close normal operation. Noninverting Output
MAX4142
OUT+
SENSE+
VOUT
SENSERF OUT-
Figure MAX4142 Functional Diagram
Detailed Description
MAX4142 differential line driver features 250MHz bandwidth 67dB common-mode rejection (CMR) 10MHz. This part achieves 1400V/µs slew rate, power dissipation only 125mW. MAX4142 internally +2V/V closed-loop gain, making ideal back-terminated line driver. output stage drive into load. MAX4142 utilizes three-amplifier topology provide differential inputs/outputs common-mode feedback (Figure making ideal applications with high common-mode noise, such driving xDSL transmissions over twisted-pair cable. MAX4142's differential noninverting structure uses noninverting amplifiers provide single device with differential inputs outputs. amplifiers effectively doubles output voltage swing bandwidth, improves slew rate when compared single op-amp differential amplifier. Excellent gain phase, along with noise, also make MAX4142 suitable video applications RF-signal processing. complete differential transmission link, MAX4142 line driver with MAX4144/MAX4146 line receivers, shown Typical Application Circuit.
Applications Information
Balanced Transmission Lines
Differential (balanced) transmission lines conductors transmit high-speed signals over low-cost cable twisted-pair wire with minimal signal degradation. transmit side balanced transmission line driven amplifier with differential outputs, while signal received amplifier with differential inputs. ideal balanced system, each conductor same impedance from input output from conductor system ground. Since impedance from each conductor ground equivalent, noise other interference coupled into transmission line will equal magnitude each conductor, appearing common-mode signal amplifier receiving transmission line. Since receiving amplifier subtracts signals each side transmission line obtain desired information, common-mode signals effectively canceled receiving amplifier.
Common-Mode Feedback
nonideal balanced systems, impedance mismatches between conductors transmission line degrade system common-mode rejection (CMR) converting portion common-mode signal
250MHz, Low-Power, High-Output-Current, Differential Line Driver
differential signal that amplified receiver. unique topology MAX4142 (Figure utilizes amplifiers provide differential inputs outputs, third amplifier (A3) provide commonmode feedback. common-mode feedback amplifier senses common-mode voltage MAX4142 output forces this voltage zero, effectively removing common-mode voltages from transmission line. This technique improves systems with imperfectly balanced transmission-line impedances.
MAX4142
MAX4142
OUT+
SENSE+
SENSERF
Grounding, Bypassing, Board Layout
Observe following guidelines when designing your board: High-frequency design techniques must followed when designing board MAX4142. printed circuit board should have least layers: signal layer ground plane. wire-wrap boards; they inductive. sockets; they increase parasitic capacitance inductance. surface-mount power-supply bypass capacitors instead through-hole capacitors. Their shorter lead lengths reduce parasitic inductance, leading superior high-frequency performance. Keep signal lines short straight possible. make turns; round corners. ground plane should free from voids possible.
OUT-
Figure MAX4142 Input Protection Circuit
MAX4142
OUT700 1.4k
Input Stage Circuitry
MAX4142 includes internal protection circuitry that prevents damage precision input stage from large differential input voltages. This protection circuitry consists five back-to-back Schottky protection diodes between (Figure diodes limit differential voltage applied amplifiers' internal circuitry more than 10VF, where diode's forward voltage drop (about 0.4V +25°C). large differential input voltage (exceeding 4V), MAX4142 input bias current IN-) increases according following equation: Input current [(VIN+ VIN-) 10VF] 1.4k differential input voltage high will cause only 2.1mA flow-much less than 10mA absolute maximum rating.
OUT+
Figure MAX4142 Shutdown Equivalent Circuit
Shutdown Mode
MAX4142 into low-power shutdown mode driving SHDN high. amplifier output high impedance this mode; thus impedance that feedback resistors (2.8k) (Figure
250MHz, Low-Power, High-Output-Current, Differential Line Driver MAX4142
MAX4142
OUT+
15pF
SENSE+
GAIN (dB)
10pF
SENSERF OUTGND
100k FREQUENCY (Hz) 100M
Figure MAX4142 Small-Signal Response with Capacitive Load
Figure Connection SENSE+ SENSE- Remote Load
Driving Capacitive Loads
MAX4142 provides maximum performance when driving output load capacitance. This case when driving correctly terminated transmission line (i.e., back-terminated cable). most amplifier circuits, driving large-load capacitance increases chance oscillations. amplifier's output impedance load capacitor combine pole excess phase loop response. pole's frequency enough phase margin degraded sufficiently, oscillations occur. second concern when driving capacitive loads results from amplifier's output impedance, which looks inductive high frequencies. inductance forms resonant circuit with capacitive load. This causes peaking frequency response degrades amplifier's phase margin. MAX4142 drives capacitive loads 25pF without oscillation. However, some peaking occur frequency domain (Figure drive larger-capacitance loads reduce ringing, isolation resistors between amplifier's outputs load (Figure value depends capacitive load (Figure With higher capacitive values, bandwidth dominated network formed RISO bandwidth amplifier itself much higher. Also note that isolation resistor forms divider that decreases voltage delivered load.
Using SENSE+ SENSEThe MAX4142 output voltage-sense pins, SENSE+ SENSE-. These pins normally connected MAX4142'S OUT+ OUT- pins. some long-line applications, desirable connect SENSE+ OUT+ SENSE- OUT- load, instead typical connection part (Figure This compensates long line's resistance, which otherwise leads voltage error. When using this technique, keep sense lines' impedance minimize gain errors. Also, keep capacitance maximize frequency response. gain MAX4142 approximated following equation: RSENSE RSENSE
where SENSE+ SENSE- SENSE+ SENSE- trace impedances, respectively. MAX4142, 700. Additionally, mismatches SENSE+ SENSEtraces lead common-mode gain errors. However, these errors effectively eliminated MAX4142's common-mode feedback (see Common-Mode Feedback section).
250MHz, Low-Power, High-Output-Current, Differential Line Driver MAX4142
MAX4142
OUT+ RISO CLOAD SENSE+ RLOAD ISOLATION RESISTANCE
SENSERF OUTRISO CLOAD RLOAD
CAPACITIVE LOAD (pF)
Figure Isolation Resistance Capacitive Load
Figure Addition RISO Amplifier Output
_Chip Information
TRANSISTOR COUNT: SUBSTRATE CONNECTED
250MHz, Low-Power, High-Output-Current, Differential Line Driver MAX4142
_Package Information
SOICN.EPS
250MHz, Low-Power, High-Output-Current, Differential Line Driver
NOTES
MAX4142
250MHz, Low-Power, High-Output-Current, Differential Line Driver MAX4142
NOTES
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 1998 Maxim Integrated Products Printed registered trademark Maxim Integrated Products.

250MHz, Low-Power, High-Output-Current, Differential Line Driver

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