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PDF AD8270 Data sheet ( Hoja de datos )
| Número de pieza | AD8270 | |
| Descripción | Precision Dual-Channel Difference Amplifier | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Data Sheet
FEATURES
With no external resistors
Difference amplifier: gains of 0.5, 1, or 2
Single ended amplifiers: over 40 different gains
Set reference voltage at midsupply
Excellent ac specifications
15 MHz bandwidth
30 V/μs slew rate
High accuracy dc performance
0.08% maximum gain error
10 ppm/°C maximum gain drift
80 dB minimum CMRR (G = 2)
Two channels in small 4 mm × 4 mm LFCSP
Supply current: 2.5 mA per channel
Supply range: ±2.5 V to ±18 V
APPLICATIONS
Instrumentation amplifier building blocks
Level translators
Automatic test equipment
High performance audio
Sine/cosine encoders
GENERAL DESCRIPTION
The AD8270 is a low distortion, dual-channel amplifier with
internal gain setting resistors. With no external components,
it can be configured as a high performance difference amplifier
with gains of 0.5, 1, or 2. It can also be configured in over 40 single-
ended configurations, with gains ranging from −2 to +3.
The AD8270 is the first dual-difference amplifier in the small
4 mm × 4 mm LFCSP. It requires the same board area as a typical
single-difference amplifier. The smaller package allows a 2×
increase in channel density and a lower cost per channel, all
with no compromise in performance.
Precision Dual-Channel
Difference Amplifier
AD8270
FUNCTIONAL BLOCK DIAGRAM
–IN1A 1 10kΩ
10kΩ
10kΩ
10kΩ 12 –IN1B
10kΩ
–IN2A 2
_
10kΩ
+IN2A 3
+
10kΩ
+IN1A 4
AD8270
_
10kΩ
11 –IN2B
+
10kΩ
10 +IN2B
10kΩ
9 +IN1B
20kΩ 20kΩ
20kΩ 20kΩ
Figure 1.
The AD8270 operates on both single and dual supplies and
requires only 2.5 mA maximum supply current for each ampli-
fier. It is specified over the industrial temperature range of
−40°C to +85°C and is fully RoHS compliant.
Table 1. Difference Amplifiers by Category
High
Single-Supply
High Speed Voltage Unidirectional
AD8270
AD8273
AMP03
AD628
AD629
AD8202
AD8203
Single-Supply
Bidirectional
AD8205
AD8206
AD8216
Rev. A
Document Feedback
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 ©2008–2016 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
1 page  
AD8270
Data Sheet
VS = ±5 V, VREF = 0 V, TA = 25°C, RLOAD = 2 kΩ, specifications referred to input, unless otherwise noted.
Table 3.
Parameter
DYNAMIC PERFORMANCE
Bandwidth
Slew Rate
Settling Time to 0.01%
Settling Time to 0.001%
NOISE/DISTORTION
Harmonic Distortion
Voltage Noise1
GAIN
Gain Error
Gain Drift
INPUT CHARACTERISTICS
Offset2
Average Temperature Drift
Common-Mode Rejection Ratio
Test Conditions/
Comments
G = 0.5
G=1
G=2
Min Typ Max Min Typ Max Min Typ Max Unit
5 V step on output
5 V step on output
20
30
550 650
600 750
15
30
550 650
600 750
10
30
550 650
600 750
MHz
V/µs
ns
ns
f = 1 kHz, VOUT = 5 V p-p,
101
141
112 dB
RLOAD = 600 Ω
f = 0.1 Hz to 10 Hz
2
1.5 1 µV p-p
f = 1 kHz
52 38 26 nV/√Hz
TA = −40°C to +85°C
TA = −40°C to +85°C
DC to 1 kHz
0.08
1 10
0.08
1 10
0.08 %
1 10 ppm/°C
450 1500
300 1000
225 750 µV
3 2 1.5 µV/°C
70 86
76 92
80 98
dB
Power Supply Rejection Ratio
Input Voltage Range3
Common-Mode Resistance4
Bias Current
OUTPUT CHARACTERISTICS
Output Swing
Short-Circuit Current Limit
POWER SUPPLY
Supply Current (per Amplifier)
TA = −40°C to +85°C
Sourcing
Sinking
TA = −40°C to +85°C
2 10
2
−5.4 +5.4 −5.4
7.5 10
500
10 2 10 dB
+5.4 −5.4
+5.4 V
7.5 kΩ
500 500 nA
−4 +4 −4 +4 −4 +4 V
−3.9 +3.9 −3.9 +3.9 −3.9 +3.9 V
100 100 100 mA
60 60 60 mA
2.3 2.5
3
2.3 2.5
3
2.3 2.5
3
mA
mA
1 Includes amplifier voltage and current noise, as well as noise of internal resistors.
2 Includes input bias and offset errors.
3 At voltages beyond the rails, internal ESD diodes begin to turn on. In some configurations, the input voltage range may be limited by the internal op amp (see the
Input Voltage Range section for details).
4 Internal resistors are trimmed to be ratio matched but have ±20% absolute accuracy. Common-mode resistance was calculated with both inputs in parallel. Common-
mode impedance at only one input is 2× the resistance listed.
Rev. A | Page 4 of 20
5 Page 
AD8270
VS = ±15V
100pF
0pF 18pF
1µs/DIV
Figure 22. Small Signal Step Response, Gain = 0.5
VS = ±15V
220pF
0pF 33pF
1µs/DIV
Figure 23. Small Signal Step Response, Gain = 1
VS = ±15V
470pF
0pF 100pF
1µs/DIV
Figure 24. Small Signal Step Response, Gain = 2
Data Sheet
160
140
VS = ±10V
120 VS = ±5V
VS = ±2.5V
100
80
60
40 VS = ±18V
VS = ±15V
20
0
0 10 20 30 40 50 60 70 80 90 100
CAPACITIVE LOAD (pF)
Figure 25. Small Signal Overshoot with Capacitive Load, Gain = 0.5
80
70
60 VS = ±10V
VS = ±5V
50 VS = ±2.5V
40
30
20 VS = ±18V
VS = ±15V
10
0
0 50 100 150 200
CAPACITIVE LOAD (pF)
Figure 26. Small Signal Overshoot with Capacitive Load, Gain = 1
80
70
60
50
VS = ±10V
40
VS = ±5V
30
VS = ±2.5V
20
VS = ±18V
10
VS = ±15V
0
0 50 100 150 200 250 300 350 400 450
CAPACITIVE LOAD (pF)
Figure 27. Small Signal Overshoot with Capacitive Load, Gain = 2
Rev. A | Page 10 of 20
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet AD8270.PDF ] | |
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