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PDF AD8279 Data sheet ( Hoja de datos )
| Número de pieza | AD8279 | |
| Descripción | Low Cost Difference Amplifiers | |
| Fabricantes | Analog Devices | |
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Low Power, Wide Supply Range,
Low Cost Difference Amplifiers, G = ½, 2
AD8278/AD8279
FEATURES
Wide input range beyond supplies
Rugged input overvoltage protection
Low supply current: 200 μA maximum (per amplifier)
Low power dissipation: 0.5 mW at VS = 2.5 V
Bandwidth: 1 MHz (G = ½)
CMRR: 80 dB minimum, dc to 20 kHz (G = ½, B Grade)
Low offset voltage drift: ±1 μV/°C maximum (B Grade)
Low gain drift: 1 ppm/°C maximum (B Grade)
Enhanced slew rate: 1.4 V/μs
Wide power supply range
Single supply: 2 V to 36 V
Dual supplies: ±2 V to ±18 V
8-lead SOIC, 14-lead SOIC, and 8-lead MSOP packages
APPLICATIONS
Voltage measurement and monitoring
Current measurement and monitoring
Instrumentation amplifier building block
Portable, battery-powered equipment
Test and measurement
GENERAL DESCRIPTION
The AD8278 and AD8279 are general-purpose difference
amplifiers intended for precision signal conditioning in power
critical applications that require both high performance and low
power. The AD8278 and AD8279 provide exceptional common-
mode rejection ratio (80 dB) and high bandwidth while amplifying
input signals that are 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 amplifier extends to almost
triple the supply voltage (for G = ½), making the amplifer 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 amp.
The AD8278 and AD8279 can be used as difference amplifiers with
G = ½ or G = 2. They can also be connected in a high precision,
single-ended configuration for non inverting and inverting gains of
−½, −2, +3, +2, +1½, +1, or +½. The AD8278 and AD8279
provide an integrated precision solution that has a smaller size,
lower cost, and better performance than a discrete alternative.
The AD8278 and AD8279 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, which is ideal for battery-operated and portable
systems. For unity-gain difference amplifiers with similar
performance, refer to the AD8276 and AD8277 data sheets.
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.
FUNCTIONAL BLOCK DIAGRAMS
+VS
7
AD8278
–IN 2
40kΩ
20kΩ
5 SENSE
6 OUT
+IN 3
40kΩ
20kΩ
1 REF
–INA 2
4
–VS
Figure 1. AD8278
40kΩ
+VS
11
AD8279
20kΩ
12 SENSEA
13 OUTA
+INA 3
–INB 6
40kΩ
40kΩ
20kΩ
20kΩ
14 REFA
10 SENSEB
9 OUTB
+INB 5
40kΩ
20kΩ
8 REFB
4
–VS
Figure 2. AD8279
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
1U = unidirectional, B = bidirectional.
The AD8278 is available in the space-saving 8-lead MSOP and
SOIC packages, and the AD8279 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.
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  
AD8278/AD8279
VS = +2.7 V to <±5 V, VREF = midsupply, TA = 25°C, RL = 10 kΩ connected to midsupply, G = ½ difference amplifier configuration, unless
otherwise noted.
Table 4.
Parameter
INPUT CHARACTERISTICS
System Offset1
Over Temperature
vs. Power Supply
Average Temperature
Coefficient
Common-Mode Rejection
Ratio (RTI)
Input Voltage Range2
Impedance3
Differential
Common Mode
DYNAMIC PERFORMANCE
Bandwidth
Slew Rate
Channel Separation
Settling Time to 0.01%
GAIN
Gain Error
Gain Drift
OUTPUT CHARACTERISTICS
Output Swing4
Short-Circuit Current Limit
Capacitive Load Drive
NOISE5
Output Voltage Noise
POWER SUPPLY6
AD8278 Supply Current
AD8279 Supply Current
Operating Voltage Range
TEMPERATURE RANGE
Operating Range
Conditions
G=½
Grade B
Min Typ Max Min
Grade A
Typ Max
TA = −40°C to +85°C
VS = ±5 V to ±18 V
75
TA = −40°C to +85°C
VS = 2.7 V, VCM = 0 V to
2.4 V, RS = 0 Ω
VS = ±5 V, VCM = −10 V
to +7 V, RS = 0 Ω
80
80
−3 (VS + 0.1)
0.3
150 75
150
2.5
12
74
74
+3 (VS − 1.5) −3 (VS + 0.1)
250
250
5
5
+3 (VS − 1.5)
120 120
30 30
f = 1 kHz
2 V step on output,
CL = 100 pF, VS = 2.7 V
870
1.3
130
7
870
1.3
130
7
TA = −40°C to +85°C
0.005 0.02
1
0.01 0.05
5
RL = 10 kΩ,
TA = −40°C to +85°C
−VS + 0.1
+VS − 0.15 −VS + 0.1
±10
200
±10
200
+VS − 0.15
f = 0.1 Hz to 10 Hz
f = 1 kHz
1.4
47 50
1.4
47 50
TA = −40°C to +85°C
TA = −40°C to +85°C
2.0
200
375
36 2.0
200
375
36
−40
+125
−40
+125
Unit
μV
μV
μV/V
μV/°C
dB
dB
V
kΩ
kΩ
kHz
V/μs
dB
μs
%
ppm/°C
V
mA
pF
μV p-p
nV/√Hz
μA
μA
V
°C
1 Includes input bias and offset current errors, RTO (referred to output).
2 The input voltage range may also be limited by absolute maximum input voltage or by the output swing. See the Input Voltage Range section for details.
3 Internal resistors are trimmed to be ratio matched and have ±20% absolute accuracy.
4 Output voltage swing varies with supply voltage and temperature. See Figure 22 through Figure 25 for details.
5 Includes amplifier voltage and current noise, as well as noise from internal resistors.
6 Supply current varies with supply voltage and temperature. See Figure 27 and Figure 28 for details.
Rev. C | Page 5 of 24
5 Page 
18
12
GAIN = 2
6
0
GAIN = ½
–6
–12
–18
–24
–30
–36
100
1k
10k 100k
FREQUENCY (Hz)
1M
10M
Figure 19. Gain vs. Frequency, +2.7 V Single Supply
120
GAIN = 2
100
GAIN = ½
80
60
40
20
0
1 10 100 1k 10k 100k 1M
FREQUENCY (Hz)
Figure 20. CMRR vs. Frequency
120
100
–PSRR
80
60
+PSRR
40
20
0
1 10 100 1k 10k 100k 1M
FREQUENCY (Hz)
Figure 21. PSRR vs. Frequency
AD8278/AD8279
+VS
–0.1
–0.2
–0.3
–0.4
+0.4
TA = –40°C
TA = +25°C
TA = +85°C
TA = +125°C
+0.3
+0.2
+0.1
–VS
2 4 6 8 10 12 14 16 18
SUPPLY VOLTAGE (±VS)
Figure 22. Output Voltage Swing vs. Supply Voltage and Temperature,
RL = 10 kΩ
+VS
–0.2
–0.4
–0.6
–0.8
–1.0
–1.2
+1.2
TA = –40°C
TA = +25°C
TA = +85°C
TA = +125°C
+1.0
+0.8
+0.6
+0.4
+0.2
–VS
2 4 6 8 10 12 14 16 18
SUPPLY VOLTAGE (±VS)
Figure 23. Output Voltage Swing vs. Supply Voltage and Temperature,
RL = 2 kΩ
+VS
–4
–8
TA = –40°C
TA = +25°C
TA = +85°C
TA = +125°C
+8
+4
–VS
1k
10k
LOAD RESISTANCE (Ω)
100k
Figure 24. Output Voltage Swing vs. RL and Temperature, VS = ±15 V
Rev. C | Page 11 of 24
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet AD8279.PDF ] | |
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