High Speed Amplifiers (BW > 50 MHz)
High Output Current Amplifiers
AD8397: Rail-to-Rail, High Output Current Amplifier
The AD8397 has two voltage feedback operational amplifiers capable of driving heavy loads with excellent linearity. The common-emitter, rail-to-rail output
stage surpasses the output voltage capability of typical emitter-follower output stages and can swing to within 0.5 V of either rail while driving a 25 Ω load.
The low distortion, high output current, and wide output dynamic range make the AD8397 ideal for applications that require a large signal swing into a
heavy load.
Features
•ꢀDual operational amplifier
12
•ꢀVoltage feedback
9
•ꢀWide supply range: from 3 V to 24 V
6
•ꢀRail-to-rail output
•ꢀOutput swing to within 0.5 V of supply rails
3
•ꢀHigh linear output current
0
•ꢀ 310 mA peak into 32 Ω on ±12 V supplies while maintaining
−80 dBc SFDR
–3
•ꢀLow noise
–6
•ꢀ 4.5 nV/√Hz voltage noise density @ 100 kHz
–9
•ꢀ 1.5 pA/√Hz current noise density @ 100 kHz
–12
•ꢀHigh speed
0
2
4
6
8
10
12
14
16
18
20
TIME (ꢀs)
•ꢀ 69 MHz bandwidth (G = 1, −3 dB)
•ꢀ 53 V/µs slew rate (RLOAD = 25 Ω)
Output swing, VS = 12 V, RL = 100 Ω.
Applications
•ꢀTwisted-pair line drivers
•ꢀAudio applications
•ꢀGeneral-purpose high current amplifiers
High Output Current Amplifiers
Distortion
Supply
Voltage
(V)
BW @ Slew
Price
@ 1k
(OEM $US)
SFDR1 @ BW
Part
No. of
ACL
Min
Noise
(nV/ z)
V
OS Max
IB
IS/Amp
IOUT
Temp
Disable
Rail-to-Rail1
ACL Min Rate
Packaging
Number Amps
√
H
(mV) (µA Max) (mA Typ) (mA) Range2
(MHz) (V/ms)
(dBc) (MHz)
3, 5,
65, 612
AD8397
AD8390
AD8392
2
1
4
RRO
1
5
1
69
60
40
53
-87
–823
–723
0.1
1
4.5
8
1
3
5
2
7
5.5
3.8
3.6
310
400
400
I
I
I
SOIC
$2.32
$2.92
•
•
300
900
LFCSP
65, 612
65, 612
LFCSP/
TSSOP
Last Time
Buy
1
4.3
15
1 RRIO: rail-to-rail input/output, RRO: rail-to-rail output, SS: single supply (IVR includes –VSY).
2
Temp range: H = extended industrial (–40°C to +125°C), I = industrial (–40°C to +85°C).
THD: total harmonic distortion.
3
Operational Amplifier Selection Guide
42
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