AD8397ARZ Analog Devices Inc, AD8397ARZ Datasheet - Page 11

• Manufacturer Part Number: AD8397ARZ
• Description: IC OPAMP VF R-R DUAL LN 8SOIC
• Manufacturer: Analog Devices Inc

Specifications of AD8397ARZ

• Slew Rate: 53 V/µs
• Amplifier Type: Voltage Feedback
• Number Of Circuits: 2
• Output Type: Rail-to-Rail
• -3db Bandwidth: 69MHz
• Current - Input Bias: 200pA
• Voltage - Input Offset: 1000µV
• Current - Supply: 11mA
• Current - Output / Channel: 310mA
• Voltage - Supply, Single/dual (±): 3 V ~ 24 V, ±1.5 V ~ 12 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Op Amp Type: High Current
• No. Of Amplifiers: 2
• Bandwidth: 69MHz
• Supply Voltage Range: 3V To 24V
• Amplifier Case Style: SOIC
• No. Of Pins: 8
• Operating Temperature Range: -40°C To +85°C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Gain Bandwidth Product: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: Q2528981

GENERAL DESCRIPTION
The AD8397 is a voltage feedback operational amplifier which
features an H-bridge input stage and common-emitter, rail-to-
rail output stage. The AD8397 can operate from a wide supply
range, ±1.5 V to ±12 V. When driving light loads, the rail-to-rail
output is capable of swinging to within 0.2 V of either rail. The
output can also deliver high linear output current when driving
heavy loads, up to 310 mA into 32 Ω while maintaining −80 dBc
SFDR. The AD8397 is fabricated on Analog Devices’ proprietary
eXtra Fast Complementary Bipolar High Voltage process
(XFCB-HV).
POWER SUPPLY AND DECOUPLING
The AD8397 can be powered with a good quality, well-
regulated, low noise supply from ±1.5 V to ±12 V. Careful
attention should be paid to decoupling the power supply. High
quality capacitors with low equivalent series resistance (ESR),
such as multilayer ceramic capacitors (MLCCs), should be used
to minimize the supply voltage ripple and power dissipation. A
0.1 µF MLCC decoupling capacitor(s) should be located no
more than 1/8 inch away from the power supply pin(s). A large
tantalum 10 µF to 47 µF capacitor is recommended to provide
good decoupling for lower frequency signals and to supply
current for fast, large signal changes at the AD8397 outputs.
LAYOUT CONSIDERATIONS
As with all high speed applications, careful attention should be
paid to printed circuit board (PCB) layout in order to prevent
associated board parasitics from becoming problematic. The
PCB should have a low impedance return path (or ground) to
the supply. Removing the ground plane from all layers in the
immediate area of the amplifier helps to reduce stray capacitan-
ces. The signal routing should be short and direct in order to
minimize the parasitic inductance and capacitance associated
with these traces. Termination resistors and loads should be
located as close as possible to their respective inputs and
outputs. Input traces should be kept as far apart as possible
from the output traces to minimize coupling (crosstalk) though
the board.
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When the AD8397 is configured as a differential driver, as in
some line driving applications, a symmetrical layout should be
provided to the extent possible in order to maximize balanced
performance. When running differential signals over a long
distance, the traces on the PCB should be close together or
any differential wiring should be twisted together to minimize
the area of the inductive loop that is formed. This reduces the
radiated energy and makes the circuit less susceptible to RF
interference. Adherence to stripline design techniques for
long signal traces (greater than approximately 1 inch) is
recommended.
UNITY-GAIN OUTPUT SWING
When operating the AD8397 in a unity-gain configuration,
the output does not swing to the rails and is constrained by
the H-bridge input. This can be seen by comparing the output
overdrive recovery in Figure 7 and the input overdrive recovery
in Figure 22. To avoid overdriving the input and to realize the
full swing afforded by the rail-to-rail output stage, the amplifier
should be used in a gain of two or greater.
–1
7
6
5
4
3
2
1
0
0
Figure 22. Unity-Gain Input Overdrive Recovery
80
INPUT
OUTPUT
160
240
320
TIME (ns)
400
480
560
640
720
AD8397
800