Datasheet

9
®
OPA606
FIGURE 6. Absolute Value Current-to-Voltage Circuit.
FIGURE 10. Low Noise/Low Distortion RIAA Preamplifier.
FIGURE 7. High-Speed Photodetector.
FIGURE 8. Isolating Load Capacitance from Buffer.
FIGURE 9. Differential Input/Differential Output Amplifier.
Output
Voltage
+15V
1MΩ
–15V
OPA606
Current
Input
4
3
2
7
6
E
O
i
0
0
E
O
= |i| R = 1V/µA
i
1MΩ
Output
+15V
150kΩ
–15V
OPA606
1. Circuit must be well shielded.
2. Stray capacitance is critical.
3. Bandwidth ≈ 1MHz
4. Output ≈ 22V/mW/cm
2
+15V
6
3
2
7
0.01µF
0.01µF
4
150kΩ150kΩ
0.1µF
Pin Photodiode
Motorola
MRD721
10kΩ
3 Metal-film
resistors
≈ 0.2pF if necessary to
prevent gain peaking
Load
OPA606
Input
2
3
Optimize response for particular 
load condition with C
1
and R
1
.
6
10kΩ
100Ω
R
1
C
1

20pF
OPA606
2
3
6
10kΩ
OPA606
3
2
6
10kΩ
R
G

2kΩ
1. Bandwidth ≈1.2MHz
2. Differential Gain = 11
3. Differential Output ≈ 50Vp-p
4. Differential Slew Rate ≈ 65V/µs
Differential Gain = 1 + (2 x 10kΩ)/R
G
Differential
Input
Differential
Output
Moving Magnet
Cartridge
Output
49.9Ω
OPA37EJ
1. Load R and C per cartridge manufacturer's recommendations.
2. Use metal film resistors and plastic film capacitors.
3. Bypass ±V
CC
adequately.
6
3
2
2.49kΩ
150pF
(1)
47.5kΩ
0.1µF
7.32kΩ
OPA606
6
2
3
200Ω
0.3µF
1.05kΩ
3.74kΩ
10kΩ
10µF
Total Mid-band Gain = 40dB

See: "Topology Considerations for RIAA Phono Preamplifiers".
AES reprint #1719.
October 1980, by Walter G. Jung
G ≈ 20V/V
G ≈ 51V/V