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PDF AD626 Data sheet ( Hoja de datos )
| Número de pieza | AD626 | |
| Descripción | Single-Supply Differential Amplifier | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Low Cost, Single-Supply
Differential Amplifier
AD626
FEATURES
Pin Selectable Gains of 10 and 100
True Single-Supply Operation
Single-Supply Range of +2.4 V to +10 V
Dual-Supply Range of ؎1.2 V to ؎6 V
Wide Output Voltage Range of 30 mV to 4.7 V
Optional Low-Pass Filtering
Excellent DC Performance
Low Input Offset Voltage: 500 V Max
Large Common-Mode Range: 0 V to +54 V
Low Power: 1.2 mW (VS = +5 V)
Good CMR of 90 dB Typ
AC Performance
Fast Settling Time: 24 s (0.01%)
Includes Input Protection
Series Resistive Inputs (RIN = 200 k⍀)
RFI Filters Included
Allows 50 V Continuous Overload
APPLICATIONS
Current Sensing
Interface for Pressure Transducers, Position Indicators,
Strain Gages, and Other Low Level Signal Sources
PRODUCT DESCRIPTION
The AD626 is a low cost, true single-supply differential amplifier
designed for amplifying and low-pass filtering small differential
voltages from sources having a large common-mode voltage.
The AD626 can operate from either a single supply of +2.4 V to
+10 V, or dual supplies of ±1.2 V to ±6 V.The input common-mode
CONNECTION DIAGRAM
8-Lead Plastic Mini-DIP (N)
and SOIC (R) Packages
–IN 1
ANALOG
GND
2
200k⍀
1/6
G = 30
200k⍀
8 +IN
7 G = 100
–VS 3
FILTER 4
100k⍀
AD626
G=2
6 +VS
5 OUT
range of this amplifier is equal to 6 (+VS – 1 V) which provides a
+24 V CMR while operating from a +5 V supply. Furthermore,
the AD626 features a CMR of 90 dB typ.
The amplifier’s inputs are protected against continuous overload of
up to 50 V, and RFI filters are included in the attenuator network.
The output range is +0.03 V to +4.9 V using a +5 V supply.The
amplifier provides a preset gain of 10, but gains between 10 and
100 can be easily configured with an external resistor. Further-
more, a gain of 100 is available by connecting the G = 100 pin to
analog ground.The AD626 also offers low-pass filter capability by
connecting a capacitor between the filter pin and analog ground.
The AD626A and AD626B operate over the industrial temperature
range of –40°C to +85°C.The AD626 is available in two 8-lead
packages: a plastic mini-DIP and SOIC.
140 25
120
100
G = 10, 100
VS = +5V
80
G = 100
60 VS = ؎5V
40
G = 10
VS = ؎5V
20
0
0.1 1 10 100 1k 10k 100k 1M
FREQUENCY – Hz
20
15 ؎VCM FOR SINGLE
AND DUAL SUPPLIES
10
5 ؎VCM FOR DUAL
SUPPLIES ONLY
0
12 34
SUPPLY VOLTAGE – ؎V
5
Figure 1. Common-Mode Rejection vs. Frequency
REV. D
Figure 2. Input Common-Mode Range vs. Supply
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. No license is granted by implication or other-
wise under any patent or patent rights of Analog Devices.Trademarks and
registered trademarks are the property of their respective companies.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
www.analog.com
Fax: 781/326-8703
© 2003 Analog Devices, Inc. All rights reserved.
1 page  
DUAL SUPPLY (@+VS = ؎5 V and TA = 25؇C, unless otherwise noted.)
AD626
Model
Parameter
GAIN
Gain Accuracy
Gain = 10
Gain = 100
Over Temperature,TA = TMIN to TMAX
Gain Linearity
Gain = 10
Gain = 100
OFFSET VOLTAGE
Input Offset Voltage
vs. Temperature
vs. Temperature
vs. Supply Voltage (PSR)
+PSR
–PSR
COMMON-MODE REJECTION
+CMR Gain = 10, 100
±CMR Gain = 10, 100
COMMON-MODE VOLTAGE RANGE
+CMV Gain = 10
–CMV Gain = 10
INPUT
Input Resistance
Differential
Common-Mode
Input Voltage Range (Common-Mode)
OUTPUT
Output Voltage Swing
Positive
Negative
Short Circuit Current
+ISC
–ISC
NOISE
Voltage Noise RTI
Gain = 10
Gain = 100
Gain = 10
Gain = 100
DYNAMIC RESPONSE
–3 dB Bandwidth
Slew Rate, TMIN to TMAX
Settling Time
POWER SUPPLY
Operating Range
Quiescent Current
TRANSISTOR COUNT
Specifications subject to change without notice.
Condition
AD626A
Min Typ Max
Total Error
RL = 10 k⍀
G = 10
G = 100
0.2 0.5
0.25 1.0
50
100
0.045 0.055
0.01 0.015
TMIN to TMAX, G = 10 or 100
TMIN to TMAX, G = 10 or 100
RL = 10 k⍀
f = 100 Hz, VCM = +24 V
f = 10 kHz, VCM = 6 V
74
64
66
55
CMR > 85 dB
CMR > 85 dB
50 500
1.0
1.0
80
66
90
60
26.5
32.5
RL = 10 k⍀
Gain = 10, 100
Gain = 10
Gain = 100
200
110
6 (VS – l)
4.7
–1.65
–1.45
4.90
–2.1
–1.8
12
0.5
f = 0.1 Hz–10 Hz
f = 0.1 Hz–10 Hz
f = 1 kHz
f = 1 kHz
VOUT = +1 V dc
Gain = 10
Gain = 100
to 0.01%, 1 V Step
TA = TMIN to TMAX
Gain = 10
Gain = 100
Number of Transistors
2
2
0.25
0.25
100
0.17 0.22
0.1 0.17
24
Ϯ1.2
Ϯ5
1.5
1.5
46
Ϯ6
2
2
AD626B
Min Typ Max Unit
0.1 0.3 %
0.15 0.6 %
30 ppm/°C
80 ppm/°C
0.045 0.055 %
0.01 0.015 %
50 250 µV
0.5 mV
0.5 µV/°C
74 80
64 66
dB
dB
80 90
55 60
dB
dB
26.5 V
32.5 V
200
110
6 (VS – l)
4.7
–1.65
–1.45
4.90
–2.1
–1.8
12
0.5
k⍀
k⍀
V
V
V
V
mA
mA
2 µV p-p
2 µV p-p
0.25 µV/ͱHz
0.25 µV/ͱHz
100
0.17 0.22
0.1 0.17
22
kHz
V/µs
V/µs
µs
Ϯ1.2
Ϯ5
1.5
1.5
46
Ϯ6 V
2 mA
2 mA
REV. D
–3–
5 Page 
AD626
100 100
90 90
10 10
0% 0%
TPC 25. SettlingTime. VS = +5 V, G = 10
TPC 26. SettlingTime. VS = +5 V, G = 100
INPUT
20V p–p
10k⍀
10k⍀
1k⍀
2k⍀
+VS
10k⍀
AD626
ERROR
OUT
–VS
Figure 3. SettlingTimeTest Circuit
THEORY OF OPERATION
The AD626 is a differential amplifier consisting of a precision
balanced attenuator, a very low drift preamplifier (A1), and an
output buffer amplifier (A2). It has been designed so that small
differential signals can be accurately amplified and filtered in the
presence of large common-mode voltages (VCM), without the use
of any other active components.
Figure 4 shows the main elements of the AD626.The signal inputs
at Pins 1 and 8 are first applied to dual resistive attenuators R1
through R4 whose purpose is to reduce the peak common-mode
voltage at the input to the preamplifier—a feedback stage based
on the very low drift op amp A1. This allows the differential
input voltage to be accurately amplified in the presence of large
common-mode voltages six times greater than that which can be
tolerated by the actual input to A1. As a result, the input CMR
extends to six times the quantity (VS – 1 V). The overall common-
mode error is minimized by precise laser-trimming of R3 and R4,
thus giving the AD626 a common-mode rejection ratio (CMRR)
of at least 10,000:1 (80 dB).
To minimize the effect of spurious RF signals at the inputs due to
rectification at the input to A1, small filter capacitors C1 and C2
are included.
The output of A1 is connected to the input of A2 via a 100 k⍀
(R12) resistor to facilitate the low-pass filtering of the signal of
interest (see Low-Pass Filtering section).
The 200 k⍀ input impedance of the AD626 requires that the source
resistance driving this amplifier be low in value (<1 k⍀)—this is
+VS FILTER
C1
R1 5pF
200k⍀
+IN
–IN
R2
200k⍀
R3
41k⍀
A1
C2
5pF
R4
41k⍀
R9
10k⍀
R12
100k⍀
R17
95k⍀
AD626
A2
R15
10k⍀
R11
10k⍀
R6
500⍀
R5
4.2k⍀
R7
500⍀
R8
10k⍀
R10
10k⍀
R14
555⍀
R13
10k⍀
OUT
REV. D
GND
GAIN = 100
Figure 4. Simplified Schematic
–9–
–VS
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet AD626.PDF ] | |
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