High-Speed, Single-Supply, Gain Closed-Loop, Rail-to-Rail Buffers with

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19-4754; 12/97
High-Speed, Single-Supply, Gain Closed-Loop, Rail-to-Rail Buffers with Enable
_General Description
precision, closed-loop, gain buffers featuring high slew rates, high output current drive, differential gain phase error. They operate with single +3.15V +11V supply with ±1.575V ±5.5V dual supplies. input common-mode voltage range extends 100mV beyond negative power-supply rail, output swings Rail-to-Rail®. These devices require only 5.5mA quiescent supply current while achieving 230MHz -3dB bandwidth 600V/µs slew rate. addition, MAX4215/ MAX4219 have disable feature that reduces supply current 400µA buffer. Input voltage noise only 10nV/Hz, input current noise only 1.3pA/Hz. This buffer family ideal low-power/lowvoltage applications requiring wide bandwidth, such video, communications, instrumentation systems. space-sensitive applications, MAX4214 comes miniature 5-pin SOT23 package.
_Features
Internal Precision Resistors Closed-Loop Gains +2V/V -1V/V High Speed: 230MHz -3dB Bandwidth 90MHz 0.1dB Gain Flatness (MAX4219/22) 600V/µs Slew Rate Single 3.3V/5.0V Operation Outputs Swing Rail-to-Rail Input Common-Mode Range Extends Beyond Differential Gain/Phase Error: 0.03%/0.04° Distortion 5MHz: -72dBc SFDR -71dB Total Harmonic Distortion High Output Drive: ±120mA 5.5mA Supply Current 400µA Shutdown Supply Current (MAX4215/19) Space-Saving SOT23-5, µMAX, QSOP Packages
_Ordering Information
PART TEMP. RANGE PINPACKAGE SOT23-5 µMAX µMAX QSOP QSOP MARK ABAH
_Selector Guide
PART MAX4214 MAX4215 MAX4217 MAX4219 MAX4222 AMPS ENABLE PIN-PACKAGE SOT23 SO/µMAX SO/µMAX QSOP QSOP
MAX4214EUK-T -40°C +85°C MAX4215ESA MAX4215EUA MAX4217ESA MAX4217EUA MAX4219ESD MAX4219EEE MAX4222ESD MAX4222EEE -40°C +85°C -40°C +85°C -40°C +85°C -40°C +85°C -40°C +85°C -40°C +85°C -40°C +85°C -40°C +85°C
_Applications
Battery-Powered Instruments Video Line Driver Analog-to-Digital Converter Interface Imaging Systems Video Routing Switching Systems Video Multiplexing Applications
_Pin Configurations
VIEW
MAX4214
Typical Application Circuit appears data sheet. Rail-to-Rail registered trademark Nippon Motorola, Inc.
SOT23-5
Configurations continued data sheet.
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.
High-Speed, Single-Supply, Gain Closed-Loop, Rail-to-Rail Buffers with Enable
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VCC VEE) .12V IN_-, IN_+, OUT_, .(VEE 0.3V) (VCC 0.3V) Output Short-Circuit Duration .Continuous Continuous Power Dissipation +70°C) 5-pin SOT23 (derate 7.1mW/°C above +70°C).571mW 8-pin (derate 5.9mW/°C above +70°C).471mW 8-pin µMAX (derate 4.1mW/°C above +70°C) .330mW 14-pin (derate 8.3mW/°C above +70°C).667mW 16-pin QSOP (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, IN_- VOUT VCC/2, noninverting configuration, TMIN TMAX, unless otherwise noted. Typical values +25°C.) (Note PARAMETER Operating Supply Voltage Range Input Voltage Range Input Offset Voltage Input Offset Voltage Drift Input Offset Voltage Matching Input Bias Current Input Resistance Voltage Gain Power-Supply Rejection Ratio (Note Output Resistance Output Current Short-Circuit Output Current PSRR ROUT IOUT TCVOS Between channels MAX4217/MAX4219/MAX4222 IN_+ IN_+, over input voltage range (VEE 0.5V) VOUT (VCC 2.0V) VOUT 2.0V -5V, VOUT 3.3V, VOUT 0.90V Sinking sourcing Output Voltage Swing VOUT Disabled Output Resistance Logic Threshold Logic High Threshold ±100 SYMBOL CONDITIONS VEE, guaranteed PSRR tests IN_+ IN_RL QSOP SOT23-5, µMAX 3.15 ±120 ±150 1.60 0.04 0.75 0.04 0.06 0.06 1.90 0.075 1.00 0.075 11.0 2.25 UNITS µV/°C
ROUT(OFF) MAX4215/MAX4219, VOUT MAX4215/MAX4219 MAX4215/MAX4219
High-Speed, Single-Supply, Gain Closed-Loop, Rail-to-Rail Buffers with Enable
ELECTRICAL CHARACTERISTICS (continued)
(VCC +5V, IN_- VOUT VCC/2, noninverting configuration, TMIN TMAX, unless otherwise noted. Typical values +25°C.) (Note PARAMETER Logic Input Current Logic Input High Current Quiescent Supply Current (per Buffer) Shutdown Supply Current SYMBOL MAX4215/MAX4219, disabled (EN_ VEE) CONDITIONS MAX4215/MAX4219, (VEE 0.2V) MAX4215/MAX4219, MAX4215/MAX4219, UNITS
Note MAX421_EU_ 100% production tested +25°C. Specifications over temperature limits guaranteed design. Note single supply tested with +4.5V +5.5V; dual supply with -4.5V -5.5V, +4.5V +5.5V; single supply with +3.15V +3.45V.
ELECTRICAL CHARACTERISTICS
(VCC +5V, IN_- VCC/2, noninverting configuration, TMIN TMAX, unless otherwise noted. Typical values +25°C.) PARAMETER Small-Signal -3dB Bandwidth Full-Power -3dB Bandwidth Bandwidth 0.1dB Gain Flatness Slew Rate Settling Time 0.1% Rise/Fall Time Spurious-Free Dynamic Range Harmonic Distortion Third-Order Intercept Input Compression Point Differential Phase Error Differential Gain Error Input Noise-Voltage Density Input Noise-Current Density Input Capacitance Disabled Output Capacitance COUT(OFF) MAX4215/MAX4219, SYMBOL BW-3dB FPBW BW0.1dB SFDR VOUT 100mVp-p VOUT 2Vp-p VOUT 100mVp-p CONDITIONS MAX4214/MAX4215/MAX4217 MAX4219/MAX4222 MAX4214/MAX4215/MAX4217 MAX4219/MAX4222 MAX4214/MAX4215/MAX4217 MAX4219/MAX4222 Second harmonic VOUT 2Vp-p, 5MHz 10MHz 10MHz NTSC, NTSC, 10kHz 10kHz Third harmonic Total harmonic distortion 0.04 0.03 degrees nV/Hz pA/Hz UNITS V/µs
VOUT step VOUT step VOUT 100mVp-p 5MHz, VOUT 2Vp-p
High-Speed, Single-Supply, Gain Closed-Loop, Rail-to-Rail Buffers with Enable
ELECTRICAL CHARACTERISTICS (continued)
(VCC +5V, IN_- VCC/2, noninverting configuration, TMIN TMAX, unless otherwise noted. Typical values +25°C.) PARAMETER Output Impedance Buffer Enable Time Buffer Disable Time Buffer Gain Matching All-Hostile Crosstalk XTALK SYMBOL ZOUT tOFF 10MHz MAX4215/MAX4219 MAX4215/MAX4219 MAX4217/MAX4219/MAX4222, 10MHz, VOUT 100mVp-p MAX4217/MAX4219/MAX4222, 10MHz, VOUT 2Vp-p CONDITIONS UNITS
Note single supply tested with +4.5V +5.5V; dual supply with -4.5V -5.5V, +4.5V +5.5V; single supply with +3.15V +3.45V.
_Typical Operating Characteristics
(VCC +5V, AVCL +2V/V, VCC/2, +25°C, unless otherwise noted.)
MAX4214/MAX4215/MAX4217 SMALL-SIGNAL GAIN FREQUENCY
MAX4214-A
MAX4214/MAX4215/MAX4217 GAIN FLATNESS FREQUENCY
MAX4214-B
MAX4214/MAX4215/MAX4217 LARGE-SIGNAL GAIN FREQUENCY
GAIN (dB) VOUT 2Vp-p
MAX4214-C
GAIN (dB) 100k FREQUENCY (Hz) 100M VOUT 100mVp-p
GAIN (dB) VOUT 100mVp-p
100k
FREQUENCY (Hz)
100M
100k FREQUENCY (Hz) 100M
High-Speed, Single-Supply, Gain Closed-Loop, Rail-to-Rail Buffers with Enable
_Typical Operating Characteristics (continued)
(VCC +5V, AVCL +2V/V, VCC/2, +25°C, unless otherwise noted.)
MAX4219/MAX4222 SMALL-SIGNAL GAIN FREQUENCY
MAX4214-D
MAX4219/MAX4222 GAIN FLATNESS FREQUENCY
MAX4214-E
MAX4219/MAX4222 LARGE-SIGNAL GAIN FREQUENCY
GAIN (dB) VOUT 2Vp-p
MAX4214-F
GAIN (dB) 100k FREQUENCY (Hz) 100M VOUT 100mVp-p
GAIN (dB) VOUT 100mVp-p
100k
FREQUENCY (Hz)
100M
100k
FREQUENCY (Hz)
100M
HARMONIC DISTORTION FREQUENCY
MAX4214-G
HARMONIC DISTORTION RESISTIVE LOAD
MAX4214-H
HARMONIC DISTORTION (dBc) -100
VOUT 2Vp-p
HARMONIC DISTORTION (dBc) -100
HARMONIC DISTORTION (dBc)
5MHz
HARMONIC
HARMONIC HARMONIC
HARMONIC HARMONIC
HARMONIC
100k
100M
RESISTIVE LOAD
-100 VOLTAGE SWING (Vp-p)
FREQUENCY (Hz)
VOLTAGE-NOISE DENSITY FREQUENCY
MAX4214-12
NOISE (pA/ CROSSTALK (dB)
NOISE (nV/Hz)
-110 -130
100k FREQUENCY (Hz)
100k FREQUENCY (Hz)
-150 100k FREQUENCY (Hz) 100M
MAX4214-04
CURRENT-NOISE DENSITY FREQUENCY
MAX4217/MAX4219/MAX4222 CROSSTALK FREQUENCY
MAX4214
VOUT 2Vp-p 5MHz
HARMONIC DISTORTION VOLTAGE SWING
High-Speed, Single-Supply, Gain Closed-Loop, Rail-to-Rail Buffers with Enable
_Typical Operating Characteristics (continued)
(VCC +5V, AVCL +2V/V, VCC/2, +25°C, unless otherwise noted.)
POWER-SUPPLY REJECTION FREQUENCY
MAX4214-M
MAX4215/MAX4219 ISOLATION FREQUENCY
MAX4214-N
CLOSED-LOOP OUTPUT IMPEDANCE FREQUENCY
MAX4214-O
POWER-SUPPLY REJECTION (dB) 100k FREQUENCY (Hz) 100M
ISOLATION (dB)
100k FREQUENCY (Hz) 100M
IMPEDANCE
0.01 100k FREQUENCY (Hz) 100M
DIFFERENTIAL GAIN PHASE
0.04 0.03 0.02 0.01 0.00 -0.01 DIFF. PHASE (deg) 0.02 0.00 -0.02 -0.04 -0.06 1.35V DIFF. GAIN
MAX4214-P
CLOSED-LOOP BANDWIDTH LOAD RESISTANCE
MAX4214-24-Q
OUTPUT SWING LOAD RESISTANCE
OUTPUT SWING (Vp-p)
MAX4214-R
VOUT 100mVp-p CLOSED-LOOP BANDWIDTH (MHz) LOAD RESISTANCE
1.35V
LOAD RESISTANCE
SMALL-SIGNAL PULSE RESPONSE
MAX4214-S
LARGE-SIGNAL PULSE RESPONSE
MAX4214-T
ENABLE RESPONSE TIME
MAX4214-U
5.0V (ENABLE) (DISABLE)
500mV/div
25mV/div
20ns/div 1.25V, GROUND 20ns/div 0.9V, GROUND 0.5V 1µs/div
High-Speed, Single-Supply, Gain Closed-Loop, Rail-to-Rail Buffers with Enable
_Typical Operating Characteristics (continued)
(VCC +5V, AVCL +2V/V, VCC/2, +25°C, unless otherwise noted.)
SMALL-SIGNAL PULSE RESPONSE 5pF)
MAX4214-V
LARGE-SIGNAL PULSE RESPONSE 5pF)
MAX4214-W
VOLTAGE SWING TEMPERATURE
MAX4214-X
500mV/div 25mV/div VOLTAGE SWING (Vp-p) 20ns/div 1.75V,
20ns/div 1.25V, TEMPERATURE (°C)
INPUT OFFSET VOLTAGE TEMPERATURE
MAX4214-Y
INPUT BIAS CURRENT TEMPERATURE
MAX4214-Z
INPUT OFFSET CURRENT TEMPERATURE
MAX4214-AA
0.20
INPUT OFFSET CURRENT (µA) TEMPERATURE (°C)
INPUT OFFSET VOLTAGE (mV)
INPUT BIAS CURRENT (µA)
0.16
0.12
0.08
0.04
TEMPERATURE (°C)
TEMPERATURE (°C)
POWER-SUPPLY CURRENT (PER AMPLIFIER) POWER-SUPPLY VOLTAGE
MAX4214-BB
POWER-SUPPLY CURRENT (PER AMPLIFIER) TEMPERATURE
MAX4214-CC
POWER-SUPPLY CURRENT (mA)
POWER-SUPPLY CURRENT (mA)
POWER-SUPPLY VOLTAGE
TEMPERATURE (°C)
High-Speed, Single-Supply, Gain Closed-Loop, Rail-to-Rail Buffers with Enable
_Pin Description
MAX4214 SOT23-5 MAX4215 SO/µMAX MAX4217 SO/µMAX MAX4219 QSOP MAX4222 QSOP N.C. INVCC OUTA INAINA+ OUTB INBINB+ OUTC INCINC+ OUTD INDIND+ Connect. internally connected. ground leave open. Amplifier Output Negative Power Supply Ground single-supply operation) Noninverting Input Inverting Input Positive Power Supply Enable Amplifier Enable Amplifier Enable Amplifier Enable Amplifier Amplifier Output Amplifier Inverting Input Amplifier Noninverting Input Amplifier Output Amplifier Inverting Input Amplifier Noninverting Input Amplifier Output Amplifier Inverting Input Amplifier Noninverting Input Amplifier Output Amplifier Inverting Input Amplifier Noninverting Input NAME FUNCTION
High-Speed, Single-Supply, Gain Closed-Loop, Rail-to-Rail Buffers with Enable
Detailed Description
single-supply, rail-to-rail output, voltage-feedback, closed-loop buffers that employ current-feedback techniques achieve 600V/µs slew rates 230MHz bandwidths. These buffers internal resistors provide preset closed-loop gain +2V/V noninverting configuration -1V/V inverting configuration. Excellent harmonic distortion differential gain/phase performance make them ideal choice wide variety video signal-processing applications. Local feedback around buffer's output stage ensures output impedance, which reduces gain sensitivity load variations. This feedback also produces demand-driven current bias output transistors ±120mA drive capability, while constraining total supply current less than 7mA. Since inverting input exhibits input impedance, terminate input with resistor when configured inverting gain applications (terminate with applications). Terminate input with 49.9 resistor noninverting case. Output terminating resistors should directly match cable impedances either configuration.
Layout Techniques
Maxim recommends using microstrip stripline techniques obtain full bandwidth. ensure board does degrade buffer's performance, design frequency greater than 1GHz. careful attention inputs outputs avoid large parasitic capacitance. Whether constantimpedance board, observe following guidelines when designing board: Don't wire-wrapped boards. They inductive. Don't sockets. They increase parasitic capacitance inductance. surface-mount instead through-hole components better high-frequency performance. board with least layers; should free from voids possible. Keep signal lines short straight possible. make turns; round corners.
_Applications Information
Power Supplies
These devices operate from single +3.15V +11V power supply from dual supplies ±1.575V ±5.5V. single-supply operation, bypass ground with 0.1µF capacitor close possible. operating with dual supplies, bypass each supply with 0.1µF capacitor.
Selecting Gain Configuration
Each buffer MAX4214 family configured voltage gain +2V/V -1V/V. gain +2V/V, ground inverting terminal. noninverting terminal signal input buffer (Figure 1a). Grounding noninverting terminal using inverting terminal signal input configures buffer gain -1V/V (Figure 1b).
Input Voltage Range Output Swing
MAX4214 family's input range extends from (VEE 100mV) (VCC 2.25V). Input ground sensing increases dynamic range single-supply applications. outputs drive load within 60mV power-supply rails. With smaller resistive loads, output swing reduced shown Electrical Characteristics Typical Operating Characteristics.
RTIN
INRS
INRTIN
MAX42_
MAX42_
Figure Noninverting Gain Configuration +2V/V)
Figure Inverting Gain Configuration -1V/V)
High-Speed, Single-Supply, Gain Closed-Loop, Rail-to-Rail Buffers with Enable
load resistance decreases, useful input range effectively limited output drive capability, since buffers have fixed voltage gain +2V/V -1V/V. example, load typically driven from 40mV above 1.6V below VCC, 40mV 3.4V when operating from single supply. buffer operated noninverting, gain +2V/V configuration with inverting input grounded, useful input voltage range becomes 20mV 1.7V instead -100mV 2.75V indicated Electrical Charac teristics. Beyond useful input range, buffer output nonlinear function input, will undergo phase reversal latchup. sists five back-to-back Schottky diodes between IN_+ IN_-. These diodes reduce disabled output resistance from when output voltage greater less than voltage IN_+. Under these conditions, input protection diodes will forward biased, lowering disabled output resistance 500.
Output Capacitive Loading Stability
MAX4214 family provides maximum performance with load capacitance. This case when load properly terminated transmission line. These devices designed drive 20pF load capacitance without oscillating, performance will reduced under these conditions.
Enable
MAX4215 MAX4219 have enable feature (EN_) that allows buffer placed low-power state. When buffers disabled, supply current reduced 400µA buffer. voltage approaches negative supply rail, input current rises. Figure shows graph input current versus voltage. Figure shows addition optional resistor series with pin, limit magnitude current increase. Figure displays resulting input current voltage relationship.
ENABLE
MAX42_
Disabled Output Resistance
include internal protection circuitry that prevents damage precision input stage from large differential input voltages (Figure This protection circuitry conIN500
Figure Circuit Reduce Enable Logic-Low Input Current
INPUT CURRENT (µA) INPUT CURRENT (µA) -100 -120 -140 -160 ABOVE VEE)
ABOVE VEE)
Figure Enable Logic-Low Input Current Enable LogicLow Threshold
Figure Enable Logic-Low Input Current Enable LogicLow Threshold with Series Resistor
High-Speed, Single-Supply, Gain Closed-Loop, Rail-to-Rail Buffers with Enable
NORMALIZED GAIN (dB) 15pF
MAX4214 MAX4215 MAX4217 MAX4219 MAX4222
10pF
IN500
100k FREQUENCY (Hz) 100M
Figure Input Protection Circuit
Figure Small-Signal Gain Frequency with Load Capacitance Isolation Resistor
RISO VOUT
CLOAD (pF)
RISO
MAX42_
RTIN
Figure Driving Capacitive Load Through Isolation Resistor
Figure Isolation Resistance Capacitive Load
Driving large capacitive loads increases chance oscillations occurring most amplifier circuits. This especially true circuits with high loop gains, such voltage followers. buffer's output resistance load capacitor combine pole excess phase loop response. frequency this pole enough interfere with loop response degrade phase margin sufficiently, oscillations occur. second problem when driving capacitive loads results from amplifier's output impedance, which looks inductive high frequencies. This inductance forms resonant circuit with capacitive load, which causes peaking frequency response degrades amplifier's gain margin.
Figure shows devices' frequency response under different capacitive loads. drive loads with greater than 20pF capacitance settle some peaking, output requires isolation resistor like shown Figure Figure graph optimal isolation resistor versus load capacitance. Figure shows frequency response when driving capacitive loads with isolation resistor. Coaxial cables other transmission lines easily driven when properly terminated both ends with their characteristic impedance. Driving back-terminated transmission lines essentially eliminates lines' capacitance.
High-Speed, Single-Supply, Gain Closed-Loop, Rail-to-Rail Buffers with Enable
NORMALIZED GAIN (dB) 100k FREQUENCY (Hz) 100M
GAIN VIDEO/RF CABLE DRIVER IN500
_Typical Application Circuit
RISO 47pF
68pF 120pF
VOUT
MAX4214
Figure Small-Signal Gain Frequency with Load Capacitance Isolation Resistor
_Chip Information
PART MAX4214 MAX4215 MAX4217 MAX4219 MAX4222 TRANSISTORS
SUBSTRATE CONNECTED
High-Speed, Single-Supply, Gain Closed-Loop, Rail-to-Rail Buffers with Enable
_Pin Configurations (continued)
VIEW
N.C.
N.C.
OUTA INA-
OUTB INBINB+
MAX4215
MAX4217
INA+
SO/µMAX
SO/µMAX
INA+ INA- OUTA
OUTC INC12 INC+
INA+ INA- OUTA N.C.
OUTC INC14 INC+
MAX4219
INB+ INBOUTB
MAX4219
INB+ INB10 OUTB N.C.
QSOP
OUTA INA- INA+ INB+ INB- OUTB
OUTD IND12 IND+
OUTA INA- INA+ INB+ INB- OUTB N.C.
OUTD IND14 IND+
MAX4222
INC+ INCOUTC
MAX4222
INC+ INC10 OUTC N.C.
QSOP
High-Speed, Single-Supply, Gain Closed-Loop, Rail-to-Rail Buffers with Enable
_Tape-and-Reel Information
NOTE: DIMENSIONS FOLLOW EIA481-1 STANDARD.
3.200 3.099 1.499 0.991
±0.102 ±0.102 +0.102 +0.000 +0.254 +0.000
1.753 3.505 1.397 3.988
±0.102 ±0.051 ±0.102 ±0.102
P010
3.988 40.005 2.007 0.254 8.001
±0.102 ±0.203 ±0.051 ±0.127 +0.305 -0.102
SOT23-5
_Package Information
SOT5L.EPS
High-Speed, Single-Supply, Gain Closed-Loop, Rail-to-Rail Buffers with Enable
_Package Information (continued)
8LUMAXD.EPS
SOICN.EPS
High-Speed, Single-Supply, Gain Closed-Loop, Rail-to-Rail Buffers with Enable
_Package Information (continued)
QSOP.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 1997 Maxim Integrated Products Printed registered trademark Maxim Integrated Products.

High-Speed, Single-Supply, Gain Closed-Loop, Rail-to-Rail Buffers with

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