CMOS Single-Supply Rail-to-Rail Input/Output Operational Amplifiers OP

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CMOS Single-Supply Rail-to-Rail Input/Output Operational Amplifiers OP

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FEATURES Single-Supply Operation: High Output Current: Supply Current: A/Amp Wide Bandwidth: Slew Rate: Phase Reversal Input Currents Unity Gain Stable APPLICATIONS Battery Powered Instrumentation Medical Remote Sensors ASIC Input Output Amplifier Automotive GENERAL DESCRIPTION
CMOS Single-Supply Rail-to-Rail Input/Output Operational Amplifiers OP250/OP450
CONFIGURATIONS 8-Lead Narrow Body (SO-8)
OP250
(Not Scale)
8-Lead TSSOP (RU-8)
OP250
OP250 OP450 dual quad CMOS single-supply, amplifiers featuring rail-to-rail inputs outputs. Both guaranteed operate from +2.7 single supply. These amplifiers have very input bias currents. Outputs capable driving loads stable with capacitive loads. Supply current less than amplifier. Applications these amplifiers include portable medical equipment, safety security, interface transducers with high output impedance. ability swing rail-to-rail both input output enables designers build multistage filters single-supply systems maintain high signal-to-noise ratios. OP250 OP450 specified over extended industrial (-40°C +125°C) temperature range. OP250, dual, available 8-lead TSSOP surface mount packages. OP450, quad, available 14-lead thin shrink small outline (TSSOP) narrow 14-lead packages.
14-Lead Narrow Body (N-14)
OP450
(Not Scale)
14-Lead TSSOP (RU-14)
AD8532
OP450
REV.
Information furnished Analog Devices believed accurate reliable. However, responsibility assumed Analog Devices use, infringements patents other rights third parties which result from use. license granted implication otherwise under patent patent rights Analog Devices. Technology Way, P.O. 9106, Norwood. 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Site: http://www.analog.com Fax: 781/326-8703 Analog Devices, Inc., 1997
OP250/OP450-SPECIFICATIONS
ELECTRICAL CHARACTERISTICS
unless otherwise noted)
Units V/mV µV/°C pA/°C pA/°C V/µs Degrees nV/Hz nV/Hz pA/Hz
Parameter INPUT CHARACTERISTICS Offset Voltage Input Bias Current
Symbol
Conditions
-40°C +125°C -40°C +85°C -40°C +125°C Input Offset Current Input Voltage Range Common-Mode Rejection Ratio Large Signal Voltage Gain Offset Voltage Drift Bias Current Drift Offset Current Drift OUTPUT CHARACTERISTICS Output Voltage High -40°C +125°C CMRR VOS/T IB/T IOS/T IOUT ZOUT PSRR -40°C +125°C 0.07 2.99 2.94
Output Voltage
-40°C +125°C -40°C +125°C MHz, -40°C +125°C -40°C +125°C 0.01%
2.85
Output Current Open Loop Impedance POWER SUPPLY Power Supply Rejection Ratio Supply Current/Amplifier DYNAMIC PERFORMANCE Slew Rate Settling Time Gain Bandwidth Product Phase Margin Channel Separation NOISE PERFORMANCE Voltage Noise Voltage Noise Density Current Noise Density
Specifications subject change without notice.
1,000 1,250
kHz,
0.95 0.05
REV.
OP250/OP450 ELECTRICAL CHARACTERISTICS
Parameter INPUT CHARACTERISTICS Offset Voltage Input Bias Current -40°C +125°C -40°C +85°C -40°C +125°C Input Offset Current Input Voltage Range Common-Mode Rejection Ratio Large Signal Voltage Gain Offset Voltage Drift Bias Current Drift Offset Current Drift OUTPUT CHARACTERISTICS Output Voltage High -40°C +125°C CMRR VOS/T IB/T IOS/T IOUT ZOUT PSRR -40°C +125°C -40°C +125°C 1,000 0.07 4.99 4.94 0.05 1,250 1,750
=2.5 unless otherwise noted)
Units V/mV µV/°C pA/°C pA/°C V/µs Degrees nV/Hz nV/Hz pA/Hz
Symbol
Conditions
Output Voltage
-40°C +125°C -40°C +125°C MHz, -40°C +125°C -40°C +125°C Distortion 0.01%
Output Current Open Loop Impedance POWER SUPPLY Power Supply Rejection Ratio Supply Current/Amplifier DYNAMIC PERFORMANCE Slew Rate Full-Power Bandwidth Settling Time Gain Bandwidth Product Phase Margin Channel Separation NOISE PERFORMANCE Voltage Noise Voltage Noise Density Current Noise Density
Specifications subject change without notice.
kHz,
REV.
OP250/OP450
ABSOLUTE MAXIMUM RATINGS
Supply Voltage. Input Voltage2 Common-Mode Input Voltage Output Short-Circuit Duration Observe Derating Curves Susceptibility 2000 Storage Temperature Range Package 65°C +150°C Operating Temperature Range OP250G/OP450G 40°C +125°C Junction Temperature Range Package 65°C +150°C Lead Temperature Range (Soldering, sec) +300°C
NOTES Absolute maximum ratings apply +25°C, unless otherwise noted. Stresses above those listed under Absolute Maximum Ratings cause permanent damage device. This stress rating only; functional operation device these other conditions above those indicated operational sections this specification implied. Exposure absolute maximum rating conditions extended periods affect device reliability.
Package Type 8-Lead SOIC 8-Lead TSSOP (RU) 14-Lead SOIC 14-Lead TSSOP (RU)
Units °C/W °C/W °C/W °C/W
specified worst case conditions, i.e., specified device soldered circuit board surface mount packages.
ORDERING GUIDE
Model OP250GS OP250GRU OP450GS OP450GRU
Temperature Range -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C
Package Description 8-Lead SOIC 8-Lead TSSOP 14-Lead SOIC 14-Lead TSSOP
Package Options SO-8 RU-8 N-14 RU-14
CAUTION (electrostatic discharge) sensitive device. Electrostatic charges high 4000 readily accumulate human body test equipment discharge without detection. Although OP250/OP450 features proprietary protection circuitry, permanent damage occur devices subjected high energy electrostatic discharges. Therefore, proper precautions recommended avoid performance degradation loss functionality.
WARNING!
SENSITIVE DEVICE
REV.
Typical Performance Characteristics-OP250/OP450
SUPPLY CURRENT AMPLIFIER
+2.7V 0.75
OUTPUT VOLTAGE
SOURCE SINK
0.001
0.01
LOAD CURRENT
1.25
1.75 2.25 SUPPLY VOLTAGE
2.75
Figure Output Voltage Supply Rail Load Current
Figure Supply Current Amplifier Supply Voltage
OUTPUT VOLTAGE
+2.5V
INPUT OFFSET VOLTAGE
SOURCE
SINK
-0.5
0.001
0.01
LOAD CURRENT
TEMPERATURE
Figure Output Voltage Supply Rail Load Current
Figure Input Offset Voltage Temperature
0.85 SUPPLY CURRENT AMPLIFIER
+5V, VS/2
INPUT BIAS CURRENT
0.75
0.65
TEMPERATURE
TEMPERATURE
Figure Supply Current Amplifier Temperature
Figure Input Bias Current Temperature
REV.
OP250/OP450-Typical Performance Characteristics
+5V, VS/2
INPUT OFFSET CURRENT
LOAD
-135 -180 -225 -270 -315 -360
PHASE SHIFT DEGREES
TEMPERATURE
GAIN
100k FREQUENCY
100M
Figure Input Offset Current Temperature
Figure Open-Loop Gain Phase
+5V,
INPUT BIAS CURRENT
+2.7V VP-P
OUTPUT SWING VP-P
COMMON-MODE VOLTAGE
FREQUENCY
Figure Input Bias Current Common-Mode Voltage
Figure Closed-Loop Output Voltage Swing Frequency
+2.7V LOAD
+5.0V VP-P
-135 -180 -225 -270 -315 -360
PHASE SHIFT DEGREES
OUTPUT SWING VP-P
GAIN
100k FREQUENCY
100M
FREQUENCY
Figure Open-Loop Gain Phase
Figure Closed-Loop Output Voltage Swing Frequency
REV.
OP250/OP450
IMPEDANCE
POWER SUPPLY REJECTION RATIO
LOAD
+PSRR -PSRR
100k FREQUENCY
100M
100k FREQUENCY
Figure Closed-Loop Output Impedance Frequency
Figure Power Supply Rejection Frequency
+2.7V
COMMON-MODE REJECTION
FREQUENCY
SMALL SIGNAL OVERSHOOT
CAPACITANCE
Figure Common-Mode Rejection Frequency
Figure Small Signal Overshoot Load Capacitance
POWER SUPPLY REJECTION RATIO +2.7V
SMALL SIGNAL OVERSHOOT
+5.0V
-PSRR
+PSRR
100k FREQUENCY
CAPACITANCE
Figure Power Supply Rejection Frequency
Figure Small Signal Overshoot Load Capacitance
REV.
OP250/OP450-Typical Performance Characteristics
1.35V 50mV 100pF 2.5V
25mV
Figre Small Signal Transient Response
Figure Large Signal Transient Response
2.5V 50mV 100pF
25mV
50µs
Figure Small Signal Transient Response
Figure Phase Reversal
CURRENT NOISE DENSITY
1.35V
500mV
0.01
FREQUENCY
100k
Figure Large Signal Transient Response
Figure Current Noise Density Frequency
REV.
OP250/OP450
FREQUENCY 10kHz FREQUENCY 1kHz
30nV/
200nV
45nV/
100nV
Figure Voltage Noise Density Frequency
Figure Voltage Noise Density Frequency
REV.
OP250/OP450
THEORY OPERATION Output Phase Reversal
OPx50 family amplifiers CMOS rail-to-rail input output single supply amplifiers designed cost high output current drive. These features make OPx50 amps ideal multimedia telecom applications. Figure shows simplified schematic OPx50 amplifier. input differential pairs consisting n-channel pair (M1-M2) p-channel pair (M3-M4) provide rail-to-rail input common-mode range. outputs input differential pairs combined compound folded-cascode stage, which drives input second differential pair gain stage. outputs second gain stage provide gate voltage drive rail-to-rail output stage. rail-to-rail output stage consists M16, which configured complementary common-source configuration. with rail-to-rail output amplifier, gain output stage, thus open loop gain amplifier, dependent load resistance. Also, maximum output voltage swing directly proportional load current. difference between maximum output voltage supply rails, known dropout voltage, determined OPx50's output transistors' on-channel resistance. output dropout voltage given Figures
Input Voltage Protection
OPx50 immune output voltage phase reversal with input voltage within supply voltages device. However, either device's inputs exceeds outside supply rails, output could exhibit phase reversal. This protection diodes becoming forward biased, thus causing polarity input terminals device switch. technique recommended Input Overvoltage Protection section should applied applications where possibility input voltages exceeding supply voltages exists.
Output Short Circuit Protection
achieve high quality rail-to-rail performance, outputs OPx50 family short-circuit protected. Although these amplifiers designed sink source much output current, shorting output directly ground could damage destroy device when excessive voltages currents applied. protect output stage, maximum output current should limited placing resistor series with output amplifier shown Figure output current limited. minimum value found from Equation
Although shown simplified schematic, there protection diodes connected from each input each power supply rail. These diodes normally reversed biased, will turn either input voltage exceeds either supply rail more than Should this condition occur input current should limited less than This done placing resistor series with input. minimum resistor value should
single supply application, should least Because inside feedback loop, VOUT affected. trade-off using slight reduction output voltage swing under heavy output current loads. will also increase effective output impedance amplifier where output impedance device.
BIAS
-VIN
+VIN
VOUT BIAS
BIAS
Figure OPx50 Simplified Schematic
-10-
REV.
OP250/OP450
OP250
VOUT
Figure Output Short-Circuit Protection
Power Dissipation
Although OPx50 family amplifiers able provide load currents proper attention should given exceed maximum junction temperature device. equation finding junction temperature given
500mV
PDISS
Where
OPx50 junction temperature PDISS OPx50 power dissipation OPx50 junction-to-ambient thermal resistance package; ambient temperature circuit
Figure Saturation Recovery from Positive Rail
application, absolute maximum junction temperature must limited +150°C. this junction temperature exceeded, device could suffer premature failure. output voltage output current phase, example, with purely resistive load, power dissipated OPx50 found
PDISS LOAD VOUT
Where ILOAD OPx50 output load current OPx50 supply voltage; VOUT output voltage
500mV
Figure Saturation Recovery from Negative Rail
Capacitive Loading
calculating power dissipation device using thermal resistance value given package type, maximum allowable ambient temperature application found using Equation
Overdrive Recovery
BANDWIDTH
overdrive, overload, recovery time amplifier time required output voltage return rated output voltage from saturated condition. This recovery time important applications where amplifier must recover quickly after large transient event. circuit Figure used evaluate recovery time OPx50. Figures show overload recovery OP250 from positive negative rails. takes approximately amplifier recover from output overload.
OPx50 family amplifiers well suited driving capacitive loads. device will remain stable unity gain even under heavy capacitive load conditions. However, capacitive load does come without penalty bandwidth. Figure shows graph OPx50 unity-gain bandwidth under various capacitive loads.
2.5V
OP250
1VP-P
VOUT
Figure Overload Recovery Time Test Circuit
CAPACITIVE LOAD
Figure Unity-Gain Bandwidth Capacitive Load
with amplifier, increase capacitive load will also result increase overshoot ringing. improve output response, series network, known snubber, REV. -11-
OP250/OP450
connected from output ground parallel with capacitive load shown Figure proper snubber network output significantly reduce output overshoot, although will increase bandwidth. Table shows some snubber network values given capacitive load. practice, these values best determined empirically based exact capacitive load application.
more information methods drive capacitive load with amp, please refer Applications Engineer article Analog Dialogue, Vol. Number 1997.
Single Supply Differential Line Driver
OP250
100mV
VOUT
Figure shows single supply differential line driver circuit that drive load with less than 0.1% distortion. design uses OP450 mimic performance fully balanced transformer based solution. However, this design occupies much less board space while maintaining distortion operate down Like transformer based design, either output shorted ground unbalanced line driver applications without changing circuit gain
47nF
Figure Schematic Using Snubber Network
Table Snubber Network Large Capacitive Loads
+12V
Load Capacitance (CL)
Snubber Network (RS,
100k
100k
OP250 GAIN
Figure shows output OP250 unity gain configuration with capacitive load. Figure shows improvement output response with snubber network added.
100mVp-p 100kHz
47µF
SET: R10, SET: R12,
Figure Noise, Single Supply Differential Line Driver
common mode output voltage equal half supply voltage. used couple input signal omitted input's voltage equal half supply voltage. circuit also configured provide additional gain desired. gain circuit
50mV
VOUT
Figure Output OP250 without Snubber Network
100mVp-p 100kHz
Where: VOUT VO2, and,
Multimedia Headphone Amplifier
Because large output drive, OP250 makes excellent headphone amplifier, illustrated Figure supply operation rail-to-rail inputs outputs maximize output signal swing single supply. Figure amplifier inputs biased halfway between supply voltages, which this application capacitor prevents power supply noise from contaminating audio signal.
50mV
Figure Output OP250 with Snubber Network
-12-
REV.
OP250/OP450
Direct Access Arrangement Modems
F/0.1
LEFT INPUT 100k
OP250
LEFT HEADPHONE
RIGHT INPUT 100k
OP250
RIGHT HEADPHONE
Figure illustrates transmit/receive telephone line interface systems. allows full duplex transmission signals transformer coupled line differential manner. Amplifier provides gain which adjusted meet modem output drive requirements. Both configured apply largest possible signal single supply transformer. Because OP450's high output current drive dropout voltages, largest signal available single supply approximately into transmission system. Amplifier configured difference amplifier reasons: prevents transmit signal from interfering with receive signal extracts receive signal from transmission line amplification Amplifier A4's gain adjusted same manner A1's meet modem's input signal requirements. Standard resistor values permit (Single In-line Package) format resistor arrays. Couple this with OP450 14-lead TSSOP SOIC footprint this circuit offers compact, cost-effective solution.
GAIN ADJUST TELEPHONE LINE 6.2V 6.2V
Figure Single-Supply Stereo Headphone Driver
2.5V 300mV
9.09k TRANSMIT
14.3k
MIDCOM 671-8005
0.01
GAIN ADJUST
0.001
FREQUENCY
RECEIVE
Figure Frequency
OP450
audio signal coupled into each input through capacitor. This large value insures resulting high pass filter cutoff below preserving full audio fidelity. input already proper bias, then coupling capacitor biasing resistors required. capacitor used output couple amplifier headphone speaker. This value much larger than input capacitor because impedance headphones, which range from more. additional resistor used series with output capacitor protect amp's output event output accidentally becomes shorted ground.
Headphone Driver
Figure Single-Supply Direct Access Arrangement Modems
REV.
-13-
OP250/OP450
OP250 SPICE Macro-Model Typical Values
10/97, Ver. ADSC Node assignments noninverting input inverting input positive supply negative supply output .SUBCKT OP250 INPUT STAGE MNIN L=2u W=66u MNIN L=2u W=66u MPIN L=2u W=66u MPIN L=2u W=66u VCM1 VCM2 POLY(3) (61,98) (73,98) (81,0) 3E-3 .25E-12 IBIAS1 700E-6 IBIAS2 700E-6 CMRR=60 ZERO 20kHz ECM1 POLY(2) (1,98) (2,98) RCM1 159.2E3 RCM2 CCM1 50E-12 PSRR=90dB, ZERO 200Hz RPS1 RPS2 CPS1 1E-5 CPS2 1E-5 EPSY POLY(2) (70,0) (0,71) RPS3 1.59E6 CPS3 500E-12 RPS4
INTERNAL VOLTAGE REFERENCE RSY1 100E3 RSY2 100E3 VSN1 EREF (90,0) POLY(1) (99,50) -1.81E-3 1.5E-5 VOLTAGE NOISE REFERENCE 30nV/rt(Hz) 16.45E-3 POLE 1.25MHz POLY(2) (4,5) (7,8) 5E-5 5E-5 10E3 12.7E-12 GAIN STAGE (20,98) 3.5E-4 6.25E6 135E-12 OUTPUT STAGE MPOUT L=2u W=6660u MNOUT L=2u W=6660u POLY(1) (98,30) .9232 POLY(1) (30,98) .8914 MODELS .MODEL MNIN NMOS(LEVEL=2,VTO=0.75, .MODEL MPIN PMOS(LEVEL=2,VTO=-0.75, .MODEL MNOUT NMOS(LEVEL=2,VTO=0.75, +KP=30E-6,LAMBDA=0.04,CGSO=0) .MODEL MPOUT PMOS(LEVEL=2,VTO=-0.75, +KP=20E-6,LAMBDA=0.04,CGSO=0) .MODEL D(IS=1E-16) .ENDS OP250
-14-
REV.
OP250/OP450
OUTLINE DIMENSIONS
Dimensions shown inches (mm).
8-Lead SOIC (SO-8)
0.1968 (5.00) 0.1890 (4.80)
8-Lead TSSOP (RU-8)
0.122 (3.10) 0.114 (2.90)
0.177 (4.50) 0.169 (4.30)
0.0098 (0.25) 0.0040 (0.10)
0.0688 (1.75) 0.0532 (1.35)
0.0196 (0.50) 0.0099 (0.25)
0.0500 0.0192 (0.49) SEATING (1.27) PLANE 0.0138 (0.35) 0.0098 (0.25) 0.0075 (0.19) 0.0500 (1.27) 0.0160 (0.41)
0.006 (0.15) 0.002 (0.05)
0.0256 (0.65) 0.0433 (1.10) 0.0118 (0.30) 0.0075 (0.19) 0.0079 (0.20) 0.0035 (0.090)
0.256 (6.50) 0.246 (6.25)
0.1574 (4.00) 0.1497 (3.80)
0.2440 (6.20) 0.2284 (5.80)
SEATING PLANE
0.028 (0.70) 0.020 (0.50)
14-Lead Plastic (N-14)
0.795 (20.19) 0.725 (18.42)
14-Lead TSSOP (RU-14)
0.201 (5.10) 0.193 (4.90)
0.280 (7.11) 0.240 (6.10) 0.060 (1.52) 0.015 (0.38) 0.130 (3.30)
0.177 (4.50) 0.169 (4.30)
0.210 (5.33) 0.160 (4.06) 0.115 (2.93) 0.022 (0.558) 0.014 (0.356)
0.100 0.070 (1.77) (2.54) 0.045 (1.15)
SEATING PLANE
0.015 (0.381) 0.008 (0.204)
0.006 (0.15) 0.002 (0.05) 0.0433 (1.10) 0.0256 (0.65) 0.0118 (0.30) 0.0075 (0.19) 0.0079 (0.20) 0.0035 (0.090)
0.256 (6.50) 0.246 (6.25)
0.325 (8.25) 0.300 (7.62) 0.195 (4.95) 0.115 (2.93)
SEATING PLANE
0.028 (0.70) 0.020 (0.50)
REV.
-15-
-16-
C3236-8-10/97
PRINTED U.S.A.

CMOS Single-Supply Rail-to-Rail Input/Output Operational Amplifiers OP

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