OPA27CZ Datasheet, PDF (11/22 Pages) Texas Instruments – Ultra-Low Noise, Precision OPERATIONAL AMPLIFIERS

1kΩ
Input
1kΩ
250Ω
2
6
OPA37
3
500pF
Output
G ≈ 50dB at 1kHz.
Metal film resistors.
Film capacitors.
R_L and C_L per head
manufacturer’s
recommendations.
100Ω
R_L
4.99kΩ 0.01µF
316kΩ
2
6
3 ^OPA37
C_L
1µF _Output
20kΩ
FIGURE 9. High Slew Rate Unity-Gain Inverting Amplifier.
Magnetic Tape Head
FIGURE 10. NAB Tape Head Preamplifier.
Total Gain = 10⁶
10Ω
10kΩ
DUT
Offset
G =1k
10Hz Low-
Pass Filter
Chart 10mV/mm
Recorder 5mm/s
A. 741 noise with circuit well-shielded from air
currents and RFI. (Note scale change.)
5µV
B. OP-07AH with circuit well-shielded from air
currents and RFI.
C. OPA27AJ with circuit well-shielded from air
currents and RFI. (Represents ultimate
OPA27 performance potential.)
D. OPA27 with circuit unshielded and exposed
to normal lab bench-top air currents.
(External thermoelectric potentials far
exceed OPA27 noise.)
E. OPA27 with heat sink and shield which
protects input leads from air currents.
Conditions same as (D).
FIGURE 11. Low Frequency Noise Comparison.
OPA27, OPA37
SBOS135C
www.ti.com
0.5µV
0.5µV
0.5µV
0.5µV
11