OP467 Analog Devices, OP467 Datasheet - Page 15

• Manufacturer Part Number: OP467
• Description: Quad Precision, High Speed Operational Amplifier
• Manufacturer: Analog Devices

Specifications of OP467

• -3db Bandwidth: 28MHz
• Slew Rate: 170V/µs
• Vos: 200µV
• Ib: 150nA
• # Opamps Per Pkg: 4
• Input Noise (nv/rthz): 6nV/rtHz
• Vcc-vee: 9V to 36V
• Isy Per Amplifier: 2.5mA
• Packages: DIP,LCC,SOIC

–2.5mV
–2.5mV
OUTPUT
2.5mV
2.5mV
IN-AMP
Figure 45. Instrumentation Amplifier Settling Time to 0.01% for a
Figure 46. Instrumentation Amplifier Settling Time to 0.01% for a
INPUT
TO
TO
0.01% 10V STEP
V
NEG SLOPE
2kΩ
2kΩ
Figure 47. Settling Time Measurement Circuit
S
= ±15V
10 V Step Input (Negative Slope)
10 V Step Input (Positive Slope)
61.9Ω
+V
–V
S
S
+
+
AD9617
549Ω
1kΩ
0.01% 10V STEP
V
POS SLOPE
S
= ±15V
ERROR
TO SCOPE
Rev. | Page 15 of 20
2 MHz BIQUAD BAND-PASS FILTER
The circuit in Figure 48 is commonly used in medical imaging
ultrasound receivers. The 30 MHz bandwidth is sufficient to
accurately produce the 2 MHz center frequency, as the measured
response shows in Figure 49. When the bandwidth of the op
amp is too close to the center frequency of the filter, the internal
phase shift of the amplifier causes excess phase shift at 2 MHz,
which alters the response of the filter. In fact, if the chosen op
amp has a bandwidth close to 2 MHz, the combined phase shift
of the three op amps causes the loop to oscillate.
Careful consideration must be given to the layout of this circuit
as with any other high speed circuit.
If the phase shift introduced by the layout is large enough, it can
alter the circuit performance, or worse, cause oscillation.
2kΩ
OP467
1/4
–10
–20
–30
–40
V
0
3kΩ
10k
R1
IN
OP467
1/4
Figure 49. Biquad Filter Response
50pF
2kΩ
R2
C1
Figure 48. 2 MHz Biquad Filter
100k
V
OUT
FREQUENCY (Hz)
2kΩ
R3
1M
OP467
1/4
2kΩ
1kΩ
R4
R6
10M
2kΩ
R5
OP467
1/4
OP467
50pF
C2
100M