OP471 Analog Devices, OP471 Datasheet - Page 11

• 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

High-Speed Differential Line Driver
The circuit of Figure 15 is a unique line driver widely used in
professional audio applications. With ± 18 V supplies, the line
driver can deliver a differential signal of 30 V p-p into a 1.5 kW
load. The output of the differential line driver looks exactly like
a transformer. Either output can be shorted to ground without
changing the circuit gain of 5, so the amplifier can easily be set
for inverting, noninverting, or differential operation. The line
driver can drive unbalanced loads, like a true transformer.
High-Output Amplifier
The amplifier shown in Figure 16 is capable of driving 20 V p-p
into a floating 400 W load. Design of the amplifier is based on a
bridge configuration. A1 amplifies the input signal and drives
the load with the help of A2. Amplifier A3 is a unity-gain inverter
which drives the load with help from A4. Gain of the high output
amplifier with the component values shown is 10, but can
easily be changed by varying R1 or R2.
REV. A
V
IN
V
Figure 13. Low-Noise Amplifier
IN
50
50
50
50
R10
R1
R4
R7
1k
R1
0.1 F
10 F
C3
C1
1/4
OP471E
1/4
OP471E
1/4
OP471E
1/4
OP471E
+
+15V
–15V
0.1 F
10 F
+
C2
C4
1/4
OP471E
A1
+15V
–15V
5k
5k
5k
5k
R11
R2
R5
R8
200
200
200
200
R3
R12
R9
R6
V
9k
Figure 16. High-Output Amplifier
OUT
R2
1/4
OP471E
A2
= 100V
50
R3
IN
–11–
50
R4
IN
Figure 14. Noise Density of Low-Noise Amplifier, G = 100
R
L
R1
10k
Figure 15. High-Speed Differential Line Driver
50
R8
100
0%
90
10
1/4
OP471
OP471E
50
R7
2k
2k
1/4
5k
R2
R3
A4
R6
5k
R5
R7
2k
R6
2k
1/4
OP471
1/4
OP471
10k
R9
10k
R4
10k
10k
OP471E
R8
R5
1/4
A3
50
R11
50
R10
OP471
R14
1k
R13
10k
R12
1k
–OUT
+OUT