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PDF AD8274 Data sheet ( Hoja de datos )
| Número de pieza | AD8274 | |
| Descripción | Precision Difference Amplifier | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AD8274 (archivo pdf) en la parte inferior de esta página. Total 17 Páginas | ||
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FEATURES
Very low distortion
0.00025% THD + N (20 kHz)
0.0015% THD + N (100 kHz)
Drives 600 Ω loads
Excellent gain accuracy
0.03% maximum gain error
2 ppm/°C maximum gain drift
Gain of ½ or 2
AC specifications
20 V/μs minimum slew rate
800 ns to 0.01% settling time
High accuracy dc performance
83 dB minimum CMRR
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
APPLICATIONS
ADC driver
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.
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
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.
Very Low Distortion,
Precision Difference Amplifier
AD8274
FUNCTIONAL BLOCK DIAGRAM
+VS
7
12kΩ
2
6kΩ
5
6
12kΩ
3
6kΩ
1
4
–VS
Figure 1.
Table 1. Difference Amplifiers by Category
Low
Distortion
AD8270
AD8273
AD8274
AMP03
High
Voltage
AD628
AD629
Single-Supply
Unidirectional
AD8202
AD8203
Single-Supply
Bidirectional
AD8205
AD8206
AD8216
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.
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.
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
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©2008–2011 Analog Devices, Inc. All rights reserved.
1 page  
AD8274
ABSOLUTE MAXIMUM RATINGS
Table 3.
Parameter
Supply Voltage
Maximum Voltage at Any Input Pin
Minimum Voltage at Any Input Pin
Storage Temperature Range
Specified Temperature Range
Package Glass Transition Temperature (TG)
Rating
±18 V
−VS + 40 V
+VS – 40 V
−65°C to +150°C
−40°C to +85°C
150°C
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
THERMAL RESISTANCE
The θJA values in Table 4 assume a 4-layer JEDEC standard
board with zero airflow.
Table 4. Thermal Resistance
Package Type
8-Lead MSOP
8-Lead SOIC
θJA
135
121
Unit
°C/W
°C/W
MAXIMUM POWER DISSIPATION
The maximum safe power dissipation for the AD8274 is limited
by the associated rise in junction temperature (TJ) on the die. At
approximately 150°C, which is the glass transition temperature,
the properties of the plastic change. Even temporarily exceeding
this temperature limit may change the stresses that the package
exerts on the die, permanently shifting the parametric performance
of the amplifiers. Exceeding a temperature of 150°C for an
extended period may result in a loss of functionality.
2.0
TJ MAX = 150°C
1.6
SOIC
1.2 θJA = 121°C/W
MSOP
0.8 θJA = 135°C/W
0.4
0
–50 –25
0 25 50 75 100
AMBIENT TEMERATURE (°C)
125
Figure 2. Maximum Power Dissipation vs. Ambient Temperature
SHORT-CIRCUIT CURRENT
The AD8274 has built-in, short-circuit protection that limits the
output current (see Figure 16 for more information). While the
short-circuit condition itself does not damage the part, the heat
generated by the condition can cause the part to exceed its
maximum junction temperature, with corresponding negative
effects on reliability. Figure 2 and Figure 16, combined with
knowledge of the part’s supply voltages and ambient temperature,
can be used to determine whether a short circuit will cause the
part to exceed its maximum junction temperature.
ESD CAUTION
Rev. C | Page 4 of 16
5 Page 
AD8274
40
35
30
25
+SR
20
–SR
15
10
5
0
–40 –20
0
20 40 60 80 100 120
TEMPERATURE (°C)
Figure 29. Slew Rate vs. Temperature
10k
1k
100 GAIN = 2
GAIN = ½
10
1
10 100 1k 10k 100k
FREQUENCY (Hz)
Figure 30. Voltage Noise Density vs. Frequency, Referred to Output
G=2
G=½
1s/DIV
Figure 31. 0.1 Hz to 10 Hz Voltage Noise, RTO
0.1
22kHz FILTER
VOUT = 10V p-p
RL = 600Ω
0.01
0.001
GAIN = 2
0.0001
10
GAIN = ½
100 1k
FREQUENCY (Hz)
10k
Figure 32. THD + N vs. Frequency, Filter = 22k Hz
100k
0.1
VOUT = 10V p-p
0.01
0.001
GAIN = 2
GAIN = ½
0.0001
10
100 1k
FREQUENCY (Hz)
10k
Figure 33. THD + N vs. Frequency, Filter = 120 kHz
100k
1
GAIN = ½
f = 1kHz
0.1
0.01
0.001
RL = 2kΩ, 100Ω
RL = 600Ω
0.0001
0
5 10 15
OUTPUT AMPLITUDE (dBu)
20
Figure 34. THD + N vs. Output Amplitude, G = ½
25
Rev. C | Page 10 of 16
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet AD8274.PDF ] | |
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