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5962-8856502CA-OP471AY/883C
High Speed, Low Noise Quad Operational Amplifier
REV.A
14-Lead
Hermetic Dip
(Y-Suffix)
16-Lead SOIC
(S-Suffix)
High Speed, Low Noise Quad
Operational Amplifier
INFigure 1.Simplified Schematic
FEATURES
Excellent Speed: 8 V/�s Typ
Low Noise: 11 nV/÷Hz @ 1 kHz Max
Unity-Gain Stable
High Gain Bandwidth: 6.5 MHz Typ
Low Input Offset Voltage: 0.8 mV Max
Low Offset Voltage Drift: 4 �V/�C Max
High Gain: 500 V/mV Min
Outstanding CMR: 105 dB Min
Industry Standard Quad Pinouts
GENERAL DESCRIPTIONThe OP471 is a monolithic quad op amp featuring low noise,
11 nV/÷Hz Max @ 1 kHz, excellent speed, 8 V/ms typical, a
gain bandwidth of 6.5 MHz, and unity-gain stability.
The OP471 has an input offset voltage under 0.8 mV and an
input offset voltage drift below 4 mV/∞C, guaranteed over the full
military temperature range. Open-loop gain of the OP471 is over
500,000 into a 10 kW load ensuring outstanding gain accuracy
and linearity. The input bias current is under 25 nA limiting
errors due to signal source resistance. The OP471’s CMR of
over 105 dB and PSRR of under 5.6 mV/V significantly reduce
errors caused by ground noise and power supply fluctuations.
The OP471 offers excellent amplifier matching which is important
for applications such as multiple gain blocks, low-noise instru-
mentation amplifiers, quad buffers and low-noise active filters.
The OP471 conforms to the industry standard 14-lead DIP
pinout. It is pin-compatible with the LM148/LM149, HA4741,
RM4156, MC33074, TL084 and TL074 quad op amps and can
be used to upgrade systems using these devices.
For applications requiring even lower voltage noise the OP470
with a voltage density of 5 nV/÷Hz Max @ 1 kHz is recommended.
PIN CONFIGURATIONS
14-Lead
Plastic Dip
(P-Suffix)
OP471–SPECIFICATIONSNOTESGuaranteed but not 100% tested.Sample tested.Guaranteed by CMR test.
ELECTRICAL CHARACTERISTICS(@ VS = �15 V, TA = 25�C, unless otherwise noted.)
OP471Average Input
Large-Signal
*Guaranteed by CMR test.
ABSOLUTE MAXIMUM RATINGS1Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±18 V
Differential Input Voltage2 . . . . . . . . . . . . . . . . . . . . . .±1.0 V
Differential Input Current2 . . . . . . . . . . . . . . . . . . . .±25 mW
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . .Supply Voltage
Output Short-Circuit Duration . . . . . . . . . . . . . . .Continuous
Storage Temperature Range
P, Y-Package . . . . . . . . . . . . . . . . . . . . . .–65∞C to +150∞C
Lead Temperature Range (Soldering, 60 sec) . . . . . . . .300∞C
Junction Temperature (Ti) . . . . . . . . . . . . .–65∞C to +150∞C
Operating Temperature Range
OP471E, OP471F . . . . . . . . . . . . . . . . . . .–25∞C to +85∞C
OP471G . . . . . . . . . . . . . . . . . . . . . . . . . . .–40∞C to +85∞C
NOTESAbsolute Maximum Ratings apply to packaged parts, unless otherwise noted.The OP471’s inputs are protected by back-to-back diodes. Current limiting
resistors are not used in order to achieve low noise performance. If differential
voltage exceeds ±1.0 V, the input current should be limited to ±25 mA.
*�JA is specified for worst-case mounting conditions, i.e., �JA is specified for device
in socket for TO, CERDIP, PDIP packages; �JA is specified for device soldered to
printed circuit board for SO packages.
CAUTIONESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000V readily
ORDERING GUIDE*Not for new design. Obsolete April 2002.
For military processed devices, please refer to the standard
microcircuit drawing (SMD) available at
www.dscc.dla.mil/programs/milspec/default.asp5962-88565022A - OP471ARCMDA
5962-88565023A - OP471ATCMDA
5962-8856502CA - OP471AYMDA
ELECTRICAL CHARACTERISTICS
(Vs = ±15 V, –25�
C £ TA £ 85�C for OP471E/F, –40�C £ TA £ 85� for OP471G,
unless otherwise noted.)
OP471TPC 1.Voltage Noise Density
vs. Frequency
TPC 4.Current Noise Density
vs. Frequency
TPC 7.Input Bias Current vs.
Temperature
TPC 2.Voltage Noise Density
vs. Supply Voltage
TPC 5.Input Offset Voltage vs.
Temperature
TPC 8.Input Offset Current vs.
Temperature
TPC 3.0.1 Hz to 10 Hz Noise
TPC 6.Warm-Up Offset
Voltage Drift
TPC 9.Input Bias Current vs.
Common-Mode Voltage
–Typical Performance Characteristics
TPC 10.CMR vs. Frequency
TPC 13.PSR vs. Frequency
TPC 16.Open-Loop Gain,
Phase Shift vs. Frequency
TPC 11.Total Supply Current
vs. Supply Voltage
TPC 14.Open-Loop Gain vs. Frequency
TPC 17.Open-Loop Gain vs.
Supply Voltage
TPC 12.Total Supply Current
vs. Temperature
TPC 15.Closed-Loop Gain
vs. Frequency
TPC 18.Gain-Bandwidth Product,
Phase Margin vs. Temperature
OP471TPC 19.Maximum Output Swing
vs. Frequency
TPC 22.Slew Rate vs. Temperature
TPC 25.Large-Signal Transient
Response
TPC 20.Maximum Output Voltage
vs. Load Resistance
TPC 23.Channel Separation vs.
Frequency
TPC 26.Small-Signal Transient
Response
TPC 21.Closed-Loop Output
Impedance vs. Frequency
TPC 24.Total Harmonic Distortion
vs. Frequency
Figure 2.Channel Separation Test Circuit
Figure 3.Burn-In Circuit
APPLICATIONS INFORMATION
Voltage and Current NoiseThe OP471 is a very low-noise quad op amp, exhibiting a typical
voltage noise of only 6.5 Hz @ 1 kHz. The low noise character-
istic of the OP471 is, in part, achieved by operating the input
transistors at high collector currents since the voltage noise is
inversely proportional to the square root of the collector current.
Current noise, however, is directly proportional to the square
root of the collector current. As a result, the outstanding voltage
noise performance of the OP471 is gained at the expense of current
noise performance which is typical for low noise amplifiers.
To obtain the best noise performance in a circuit, it is vital to
understand the relationship between voltage noise (en), current
noise (in), and resistor noise (et).
Total Noise and Source ResistanceThe total noise of an op amp can be calculated by:
where:
En = total input referred noise
en = op amp voltage noise
in = op amp current noise
et = source resistance thermal noise
Figure 4.Total Noise vs. Source Resistance (Including
Resistor Noise) at 1 kHz
Figure 5.Total Noise vs. Source Resistance (Including
Resistor Noise) at 10 Hz
Figure 4 shows the relationship between total noise at 1 kHz
and source resistance. For RS < 1 kW the total noise is domi-
nated by the voltage noise of the OP471. As RS rises above 1 kW,
total noise increases and is dominated by resistor noise rather
than by voltage or current noise of the OP471. When RS exceeds
20 kW, current noise of the OP471 becomes the major contributor
to total noise.
Figure 5 also shows the relationship between total noise and source
resistance, but at 10 Hz. Total noise increases more quickly
than shown in Figure 4 because current noise is inversely pro-
portional to the square root of frequency. In Figure 5, current
noise of the OP471 dominates the total noise when RS > 5 kW.
From Figures 4 and 5, it can be seen that to reduce total noise,
source resistance must be kept to a minimum. In applications
with a high source resistance, the OP400, with lower current
noise than the OP471, will provide lower total noise.
OP471Figure 6.Peak-to-Peak Noise (0.1 Hz to 10 Hz) vs. Source
Resistance (Includes Resistor Noise)
Figure 6 shows peak-to-peak noise versus source resistance over
the 0.1 Hz to 10 Hz range. Once again, at low values of RS, the
voltage noise of the OP471 is the major contributor to peak-to-peak
noise. Current noise becomes the major contributor as RS increases.
The crossover point between the OP471 and the OP400 for
peak-to-peak noise is at RS = 17 W.
The OP470 is a lower noise version of the OP471, with a typical
noise voltage density of 3.2 nV/÷Hz @ 1 kHz. The OP470 offers
lower offset voltage and higher gain than the OP471, but is a slower
speed device, with a slew rate of 2 V/ms compared to a slew rate
of 8 V/ms for the OP471.
Figure 7.Peak-to-Peak Voltage Noise Test Circuit (0.1 Hz to 10 Hz)
For reference, typical source resistances of some signal sources
are listed in Table I.
TABLE I.*For further information regarding noise calculations, see “Minimization of
Noise in Op Amp Applications,” Application Note AN-15.
