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부품번호 | AD626 기능 |
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기능 | Single-Supply Differential Amplifier | ||
제조업체 | Analog Devices | ||
로고 | |||
전체 14 페이지수
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.
AD626–SPECIFICATIONS
SINGLE SUPPLY (@+VS = +5 V and TA = 25؇C, unless otherwise noted.)
Model
Parameter
Condition
AD626A
AD626B
Min Typ Max Min Typ Max Unit
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
Total Error
@ VOUT ≥ 100 mV dc
@ VOUT ≥ 100 mV dc
G = 10
G = 100
@ VOUT ≥ 100 mV dc
@ VOUT ≥ 100 mV dc
TMIN to TMAX, G = 10 or 100
TMIN to TMAX, G = 10 or 100
74
64
0.4 1.0
0.1 1.0
50
150
0.014 0.016
0.014 0.02
1.9 2.5
2.9
6
80 74
66 64
0.2 0.6 %
0.5 0.6 %
30 ppm/°C
120 ppm/°C
0.014 0.016 %
0.014 0.02 %
1.9 2.5 mV
2.9 mV
6 µV/°C
80 dB
66 dB
COMMON-MODE REJECTION
+CMR Gain = 10, 100
±CMR Gain = 10, 100
–CMR Gain = 10, 100*
COMMON-MODE VOLTAGE RANGE
+CMV Gain = 10
–CMV Gain = 10
RL = 10 k⍀
f = 100 Hz, VCM = +24 V
f = 10 kHz, VCM = +6 V
f = 100 Hz, VCM = –2 V
CMR > 85 dB
CMR > 85 dB
66
55
60
90
64
85
+24
–2
80 90
55 64
73 85
+24
–2
dB
dB
dB
V
V
INPUT
Input Resistance
Differential
Common-Mode
Input Voltage Range (Common-Mode)
OUTPUT
Output Voltage Swing
Positive
Negative
Short Circuit Current
+ISC
NOISE
Voltage Noise RTI
Gain = 10
Gain = 100
Gain = 10
Gain = 100
RL = 10 k⍀
Gain = 10
Gain = 100
Gain = 10
Gain = 100
f = 0.1 Hz–10 Hz
f = 0.1 Hz–10 Hz
f = 1 kHz
f = 1 kHz
200
100
6 (VS – l)
4.7 4.90
4.7 4.90
0.03
0.03
12
2
2
0.25
0.25
200
100
6 (VS – l)
4.7 4.90
4.7 4.90
0.03
0.03
12
2
2
0.25
0.25
k⍀
k⍀
V
V
V
V
V
mA
µV p-p
µV p-p
µV/ͱHz
µV/ͱHz
DYNAMIC RESPONSE
–3 dB Bandwidth
Slew Rate, TMIN to TMAX
Settling Time
VOUT = +1 V dc
Gain = 10
Gain = 100
to 0.01%, 1 V Step
100
0.17 0.22
0.1 0.17
24
100
0.17 0.22
0.1 0.17
22
kHz
V/µs
V/µs
µs
POWER SUPPLY
Operating Range
Quiescent Current
TA = TMIN to TMAX
Gain = 10
Gain = 100
2.4 5
12 2.4 5
10 V
0.16 0.20
0.16 0.20 mA
0.23 0.29
0.23 0.29 mA
TRANSISTOR COUNT
Number of Transistors
46
46
*At temperatures above 25°C, –CMV degrades at the rate of 12 mV/°C; i.e., @ 25°C CMV = –2 V, @ 85°C CMV = –1.28 V.
Specifications subject to change without notice.
–2– REV. D
4페이지 Typical Performance Characteristics–AD626
25
20
15
10
5
0
1
؎VCM FOR SINGLE
AND DUAL SUPPLIES
؎VCM FOR DUAL
SUPPLIES ONLY
234
SUPPLY VOLTAGE – ؎V
5
6
5
VS = ؎5V
GAIN = 10, 100
4
3
2
1
0
–1
10
100 1k
LOAD RESISTANCE – ⍀
10k
TPC 1. Input Common-Mode Range vs. Supply
TPC 4. Positive Output Voltage Swing vs. Resistive Load
5
TA = 25؇C
4
3
SINGLE AND
DUAL SUPPLY
2
DUAL SUPPLY
ONLY
1
0
01234 5
SUPPLY VOLTAGE – V
TPC 2. Positive Output Voltage Swing vs. Supply Voltage
–6
–5
–4
–3 GAIN = 10
–2
GAIN = 100
–1
0
1
100
1k 10k
LOAD RESISTANCE – ⍀
100k
TPC 5. Negative Output Voltage Swing vs. Resistive Load
–5
TA = 25؇C
–4
–3
–2
–1
DUAL SUPPLY
ONLY
30
20
10
0
012345
SUPPLY VOLTAGE – V
TPC 3. Negative Output Voltage Swing vs. Supply Voltage
0
0123 45
WARM-UP TIME – Minutes
TPC 6. Change in Input Offset Voltage vs. Warm-UpTime
REV. D
–5–
7페이지 | |||
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