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PDF AD8276 Data sheet ( Hoja de datos )
| Número de pieza | AD8276 | |
| Descripción | (AD8276 / AD8277) Low Cost Unity-Gain Difference Amplifiers | |
| Fabricantes | Analog Devices | |
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Data Sheet
Low Power, Wide Supply Range, Low Cost
Unity-Gain Difference Amplifiers
AD8276/AD8277
FEATURES
Wide input range beyond supplies
Rugged input overvoltage protection
Low supply current: 200 μA maximum per channel
Low power dissipation: 0.5 mW at VS = 2.5 V
Bandwidth: 550 kHz
CMRR: 86 dB minimum, dc to 10 kHz
Low offset voltage drift: ±2 μV/°C maximum (B Grade)
Low gain drift: 1 ppm/°C maximum (B Grade)
Enhanced slew rate: 1.1 V/μs
Wide power supply range:
Single supply: 2 V to 36 V
Dual supplies: ±2 V to ±18 V
APPLICATIONS
Voltage measurement and monitoring
Current measurement and monitoring
Differential output instrumentation amplifier
Portable, battery-powered equipment
Test and measurement
GENERAL DESCRIPTION
The AD8276/AD8277 are general-purpose, unity-gain difference
amplifiers intended for precision signal conditioning in power
critical applications that require both high performance and low
power. They provide exceptional common-mode rejection ratio
(86 dB) and high bandwidth while amplifying signals well beyond
the supply rails. The on-chip resistors are laser-trimmed for
excellent gain accuracy and high CMRR. They also have extremely
low gain drift vs. temperature.
The common-mode range of the amplifiers extends to almost
double the supply voltage, making these amplifiers ideal for single-
supply applications that require a high common-mode voltage
range. The internal resistors and ESD circuitry at the inputs also
provide overvoltage protection to the op amps.
The AD8276/AD8277 are unity-gain stable. While they are
optimized for use as difference amplifiers, they can also be
connected in high precision, single-ended configurations with
G = −1, +1, +2. The AD8276/AD8277 provide an integrated
precision solution that has smaller size, lower cost, and better
performance than a discrete alternative.
The AD8276/AD8277 operate on single supplies (2.0 V to 36 V)
or dual supplies (±2 V to ±18 V). The maximum quiescent
supply current is 200 μA per channel, which is ideal for battery-
operated and portable systems.
FUNCTIONAL BLOCK DIAGRAM
+VS
7
AD8276
–IN 2
40kΩ
40kΩ
5 SENSE
6 OUT
+IN 3
40kΩ
40kΩ
1 REF
–INA 2
4
–VS
Figure 1. AD8276
+VS
40kΩ
11
AD8277
40kΩ
12 SENSEA
+INA 3
40kΩ
–INB 6
40kΩ
13 OUTA
40kΩ
14 REFA
40kΩ
10 SENSEB
9 OUTB
+INB 5
40kΩ
40kΩ
8 REFB
4
–VS
Figure 2. AD8277
Table 1. Difference Amplifiers by Category
Low
Distortion
AD8270
AD8271
AD8273
AD8274
AMP03
High
Voltage
AD628
AD629
Current
Sensing1
AD8202 (U)
AD8203 (U)
AD8205 (B)
AD8206 (B)
AD8216 (B)
Low Power
AD8276
AD8277
AD8278
1 U = unidirectional, B = bidirectional.
The AD8276 is available in the space-saving 8-lead MSOP and
SOIC packages, and the AD8277 is offered in a 14-lead SOIC
package. Both are specified for performance over the industrial
temperature range of −40°C to +85°C and are fully RoHS
compliant.
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 ©2009–2011 Analog Devices, Inc. All rights reserved.
1 page  
Data Sheet
ABSOLUTE MAXIMUM RATINGS
Table 4.
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 5 assume a 4-layer JEDEC standard
board with zero airflow.
Table 5.
Package Type
8-Lead MSOP
8-Lead SOIC
14-Lead SOIC
θJA Unit
135 °C/W
121 °C/W
105 °C/W
MAXIMUM POWER DISSIPATION
The maximum safe power dissipation for the AD8276/AD8277
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.
AD8276/AD8277
2.0
TJ MAX = 150°C
1.6
14-LEAD SOIC
θJA = 105°C/W
1.2 8-LEAD SOIC
θJA = 121°C/W
0.8
8-LEAD MSOP
θJA = 135°C/W
0.4
0
–50 –25
0 25 50 75 100
AMBIENT TEMERATURE (°C)
125
Figure 3. Maximum Power Dissipation vs. Ambient Temperature
SHORT-CIRCUIT CURRENT
The AD8276/AD8277 have built-in, short-circuit protection
that limits the output current (see Figure 25 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 3 and Figure 25, combined
with knowledge of the supply voltages and ambient temperature of
the part, can be used to determine whether a short circuit will
cause the part to exceed its maximum junction temperature.
ESD CAUTION
Rev. C | Page 5 of 20
5 Page 
Data Sheet
30
25
20
15
ISHORT+
10
5
0
–5
–10 ISHORT–
–15
–20
–50 –30 –10 10 30 50 70 90 110 130
TEMPERATURE (°C)
Figure 25. Short-Circuit Current Per Channel vs. Temperature
1.4
1.2
–SR
1.0
+SR
0.8
0.6
0.4
0.2
0
–50 –30 –10 10 30 50 70 90 110 130
TEMPERATURE (°C)
Figure 26. Slew Rate vs. Temperature, VIN = 20 V p-p, 1 kHz
8
6
4
2
0
–2
–4
–6
–8
–10 –8 –6 –4 –2 0 2 4 6 8
OUTPUT VOLTAGE (V)
Figure 27. Gain Nonlinearity, VS = ±15 V, RL ≥ 2 kΩ
10
AD8276/AD8277
5V/DIV
11.24 µs TO 0.01%
13.84µs TO 0.001%
0.002%/DIV
TIME (µs)
40µs/DIV
Figure 28. Large-Signal Pulse Response and Settling Time, 10 V Step,
VS = ±15 V
1V/DIV
4.34 µs TO 0.01%
5.12µs TO 0.001%
0.002%/DIV
TIME (µs)
40µs/DIV
Figure 29. Large-Signal Pulse Response and Settling Time, 2 V Step,
VS = 2.7 V
10µs/DIV
Figure 30. Large-Signal Step Response
Rev. C | Page 11 of 20
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet AD8276.PDF ] | |
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