Very Low Distortion,
Precision Difference Amplifier
AD8274
FUNCTIONAL BLOCK DIAGRAM
FEATURES
+V
S
Very low distortion
7
0.00025% THD + N (20 kHz)
0.0015% THD + N (100 kHz)
Drives 600 Ω loads
12kΩ
12kΩ
6kΩ
6kΩ
2
5
6
Excellent gain accuracy
0.03% maximum gain error
2 ppm/°C maximum gain drift
Gain of ½ or 2
3
1
AC specifications
20 V/μs minimum slew rate
800 ns to 0.01% settling time
High accuracy dc performance
83 dB minimum CMRR
4
–V
S
Figure 1.
700 μV maximum offset voltage
8-lead SOIC and MSOP packages
Supply current: 2.6 mA maximum
Supply range: 2.5 V to 18 V
Table 1. Difference Amplifiers by Category
Low
Distortion
High
Voltage
Single-Supply
Unidirectional
Single-Supply
Bidirectional
APPLICATIONS
ADC driver
AD8270
AD8273
AD8274
AMP03
AD628
AD629
AD8202
AD8203
AD8205
AD8206
AD8216
High performance audio
Instrumentation amplifier building blocks
Level translators
Automatic test equipment
Sine/cosine encoders
GENERAL DESCRIPTION
The AD8274 is a difference amplifier that delivers excellent ac
and dc performance. Built on Analog Devices, Inc., proprietary
iPolar® process and laser-trimmed resistors, AD8274 achieves a
breakthrough in distortion vs. current consumption and has
excellent gain drift, gain accuracy, and CMRR.
With no external components, the AD8274 can be configured
as a G = ½ or G = 2 difference amplifier. For single-ended
applications that need high gain stability or low distortion
performance, the AD8274 can also be configured for several
gains ranging from −2 to +3.
Distortion in the audio band is an extremely low 0.00025%
(112 dB) at a gain of ½ and 0.00035% (109 dB) at a gain of 2
while driving a 600 Ω load
The excellent distortion and dc performance of the AD8274,
along with its high slew rate and bandwidth, make it an excellent
ADC driver. Because of the part’s high output drive, it also
makes a very good cable driver.
With supply voltages up to 18 V (+36 V single supply), the
AD8274 is well suited for measuring large industrial signals.
Additionally, the part’s resistor divider architecture allows it to
measure voltages beyond the supplies.
The AD8274 only requires 2.6 mA maximum supply current. It
is specified over the industrial temperature range of −40°C to
+85°C and is fully RoHS compliant. For the dual version, see the
AD8273 data sheet.
Rev. C
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responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
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