AD8397 Analog Devices, AD8397 Datasheet - Page 12

• Manufacturer Part Number: AD8397
• Description: Rail-to-Rail, High Output Current Amplifier
• Manufacturer: Analog Devices

Specifications of AD8397

• -3db Bandwidth: 69MHz
• Slew Rate: 53V/µs
• Vos: 1mV
• Ib: 200nA
• # Opamps Per Pkg: 2
• Input Noise (nv/rthz): 4.5nV/rtHz
• Vcc-vee: 3V to 24V
• Isy Per Amplifier: 15mA
• Packages: SOIC

AD8397
CAPACITIVE LOAD DRIVE
When driving capacitive loads, many high speed operational
amplifiers exhibit peaking in their frequency response. In a
gain-of-two circuit, Figure 23 shows that the
capacitive loads up to 270 pF with only 3 dB of peaking. For
amplifiers with more limited capacitive load drive, a small series
resistor (R
the capacitive load in order to minimize peaking and ensure
device stability. Figure 24 shows that the use of a 2.2 Ω series
resistor can further extend the capacitive load drive of the AD8397
out to 470 pF, while keeping the frequency response peaking to
within 3 dB.
–10
–15
–20
–25
–30
–35
–40
Figure 23. Capacitive Load Peaking Without Series Resistor
–5
0.01
5
0
S
) is generally used between the amplifier output and
0.1
FREQUENCY (MHz)
1
10
150pF
220pF
100pF
AD8397
270pF
100
can drive
Rev. A | Page 12 of 16
Figure 24. Capacitive Load Peaking with 2.2 Ω Series Resistor
–10
–15
–20
–25
–30
–35
–40
–5
5
0
0.01
0.1
FREQUENCY (MHz)
1
270pF
390pF
10
330pF
470pF
100