24 MHz Rail-to-Rail Amplifiers
with Shutdown Option
AD8646/AD8647/AD8648
FEATURES
PIN CONFIGURATIONS
Offset voltage: 2.5 mV maximum
Single-supply operation: 2.7 V to 5.5 V
Low noise: 8 nV/√Hz
OUTA
–INA
+INA
V–
1
2
3
4
8
7
6
5
V+
OUTB
–INB
+INB
AD8646
TOP VIEW
(Not to Scale)
Wide bandwidth: 24 MHz
Slew rate: 11 V/μs
Figure 1. 8-Lead SOIC and MSOP
Short-circuit output current: 120 mA
No phase reversal
Low input bias current: 1 pA
Low supply current per amplifier: 2 mA maximum
Unity gain stable
OUTA
–INA
+INA
V–
1
2
3
4
5
10 V+
9
8
7
6
OUTB
AD8647
–INB
+INB
SDB
TOP VIEW
(Not to Scale)
SDA
APPLICATIONS
Figure 2. 10-Lead MSOP
Battery-powered instruments
Multipole filters
ADC front ends
Sensors
Barcode scanners
1
2
3
4
5
6
7
OUTA
–INA
+INA
V+
14
13
OUTD
–IND
AD8648
TOP VIEW
(Not to Scale)
12 +IND
11
V–
+INB
–INB
OUTB
10 +INC
ASIC input or output amplifiers
Audio amplifiers
9
–INC
8
OUTC
Photodiode amplifiers
Datapath/mux/switch control
Figure 3. 14-Lead SOIC and TSSOP
GENERAL DESCRIPTION
The AD8646 and the AD8647 are the dual, and the AD8648 is
the quad, rail-to-rail, input and output, single-supply amplifiers
featuring low offset voltage, wide signal bandwidth, low input
voltage, and low current noise. The AD8647 also has a low
power shutdown function.
from the wide bandwidth and low distortion. TheAD8646/
AD8647/AD8648 offer high output drive capability, which is
excellent for audio line drivers and other low impedance
applications.
Applications include portable and low powered instrumenta-
tion, audio amplification for portable devices, portable phone
headsets, barcode scanners, and multipole filters. The ability to
swing rail to rail at both the input and output enables designers
to buffer CMOS ADCs, DACs, ASICs, and other wide output
swing devices in single-supply systems.
The combination of 24 MHz bandwidth, low offset, low noise,
and very low input bias current makes these amplifiers useful in
a wide variety of applications. Filters, integrators, photodiode
amplifiers, and high impedance sensors all benefit from the
combination of performance features. AC applications benefit
Rev. B
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