OP471 Analog Devices, OP471 Datasheet - Page 8

• Manufacturer Part Number: OP471
• Description: High Speed, Low Noise Quad Operational Amplifier
• Manufacturer: Analog Devices

Specifications of OP471

• Vcc-vee: 9V to 36V
• Isy Per Amplifier: 2.75mA
• Packages: LCC,SOIC
• -3db Bandwidth: 6.5MHz
• Slew Rate: 8V/µs
• Vos: 1mV
• Ib: 25nA
• # Opamps Per Pkg: 4
• Input Noise (nv/rthz): 6.5nV/rtHz

OP471
Figure 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 R
voltage noise of the OP471 is the major contributor to peak-to-peak
noise. Current noise becomes the major contributor as R
The crossover point between the OP471 and the OP400 for
peak-to-peak noise is at R
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.
1000
100
10
5
R1
5
R2
100
OP400
OP470
OP471
OP11
OP471
DUT
1.24k
RESISTOR
NOISE ONLY
R3
RS – SOURCE RESISTANCE –
200
R4
1k
S
= 17 W.
Figure 7. Peak-to-Peak Voltage Noise Test Circuit (0.1 Hz to 10 Hz)
OP27E
909
R5
10k
2 F
C1
1N4148
R6
600k
D1
S
increases.
100k
R8
10k
S
D2
1N4148
, the
–8–
OP15E
0.032 F
306k
For reference, typical source resistances of some signal sources
are listed in Table I.
Device
Strain gauge
Magnetic
tapehead
Magnetic
phonograph
cartridges
Linear variable < 1,500 W
differential
transformer
*For further information regarding noise calculations, see “Minimization of
Noise in Op Amp Applications,” Application Note AN-15.
R9
C2
65.4k
R10
Source
< 500 W
< 1,500 W
< 1,500 W
Impedance
65.4k
R11
10k
0.22 F
C3
0.22 F
R12
C4
TABLE I.
OP15E
Comments
Typically used in
low-frequency applications.
Low I
self-magnetization problems
when direct coupling is used.
OP471 I
Similar need for low I
coupled applications. OP471
will not introduce any
self -magnetization problem.
Used in rugged servo-feedback
applications. Bandwidth of
interest is 400 Hz to 5 kHz.
5.9k
R13
B
GAIN = 50,000
V
very important to reduce
S
B
=
can be neglected.
15V
4.99k
R14
B
C5
1 F
in direct
e
REV. A
OUT