Datenblatt-pdf.com


AD626 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer AD626
Beschreibung Single-Supply Differential Amplifier
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 14 Seiten
AD626 Datasheet, Funktion
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 Datasheet, Funktion
AD626
ABSOLUTE MAXIMUM RATINGS1
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +36V
Internal Power Dissipation2
Peak Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +60 V
Maximum Reversed Supply Voltage Limit . . . . . . . . . . . . . –34V
Output Short Circuit Duration . . . . . . . . . . . . . . . . . . Indefinite
Storage Temperature Range (N, R) . . . . . . . . . –65°C to +125°C
Operating Temperature Range
AD626A/AD626B . . . . . . . . . . . . . . . . . . . . –40°C to +85°C
Lead Temperature Range (Soldering 60 sec) . . . . . . . . . +300°C
NOTES
1Stresses 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.
2 8-Lead Plastic Package: JA = 100°C/W; JC = 50°C/W.
8-Lead SOIC Package: JA = 155°C/W; JC = 40°C/W.
Model
AD626AN
AD626AR
AD626BN
AD626AR-REEL
AD626AR-REEL7
ORDERING GUIDE
Temperature
Range
Package
Description
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
Plastic DIP
Small Outline IC
Plastic DIP
13" Tape and Reel
7" Tape and Reel
Package
Option
N-8
R-8
N-8
METALLIZATION PHOTOGRAPH
Dimensions shown in inches and (mm).
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate
on the human body and test equipment and can discharge without detection. Although the AD626 features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
–4–
REV. D

6 Page









AD626 pdf, datenblatt
AD626
necessary to minimize gain error. Also, any mismatch between the
total source resistance at each input will affect gain accuracy and
common-mode rejection (CMR). For example: when operating at
a gain of 10, an 80 mismatch in the source resistance between
the inputs will degrade CMR to 68 dB.
The output buffer, A2, operates at a gain of 2 or 20, thus setting
the overall, precalibrated gain of the AD626 (with no external
components) at 10 or 100.The gain is set by the feedback network
around amplifier A2.
The output of amplifier A2 relies on a 10 kresistor to –VS for
“pull-down.” For single-supply operation, (–VS = “GND”), A2
can drive a 10 kground referenced load to at least +4.7 V. The
minimum, nominally “zero,” output voltage will be 30 mV. For
dual-supply operation (±5 V), the positive output voltage swing
will be the same as for a single supply. The negative swing will be
to –2.5 V, at G = 100, limited by the ratio:
VS
×
R15 + R14
R13 + R14 + R15
The negative range can be extended to –3.3 V (G = 100) and –4 V
(G = 10) by adding an external 10 kpull-down from the output
to –VS. This will add 0.5 mA to the AD626’s quiescent current,
bringing the total to 2 mA.
The AD626’s 100 kHz bandwidth at G = 10 and 100 (a 10 MHz
gain bandwidth) is much higher than can be obtained with low
power op amps in discrete differential amplifier circuits. Further-
more, the AD626 is stable driving capacitive loads up to 50 pF
(G10) or 200 pF (G100). Capacitive load drive can be increased
to 200 pF (G10) by connecting a 100 resistor in series with the
AD626’s output and the load.
ADJUSTING THE GAIN OF THE AD626
The AD626 is easily configured for gains of 10 or 100. Figure 5
shows that for a gain of 10, Pin 7 is simply left unconnected; simi-
larly, for a gain of 100, Pin 7 is grounded, as shown in Figure 6.
Gains between 10 and 100 are easily set by connecting a variable
resistance between Pin 7 and Analog GND, as shown in Figure 7.
Because the on-chip resistors have an absolute tolerance of ±20%
(although they are ratio matched to within 0.1%), at least a 20%
adjustment range must be provided. The values shown in the
table in Figure 7 provide a good trade-off between gain set range
and resolution, for gains from 11 to 90.
+INPUT
+INPUT
–INPUT
–VS
0.1F
–IN 200k
1
200k+IN
8
ANALOG
2 GND
1/6
G = 30
G = 100 7
3 –VS
100k
FILTER
4
AD626
+VS 6
OUT
G=2
5
+VS
0.1F
OUTPUT
Figure 6. AD626 Configured for a Gain of 100
+INPUT
–INPUT
–IN 200k
1
200k+IN
8
2
ANALOG
GND
1/6
G = 30
RH
G = 100 7
RG
–VS
0.1F
CF
FILTER
(OPTIONAL)
3 –VS
100k
FILTER
4
AD626
+VS 6
OUT
G=2
5
+VS
0.1F
OUTPUT
CORNER FREQUENCY OF FILTER =
1
2CF (100k)
RESISTOR VALUES FOR GAIN ADJUSTMENT
GAIN RANGE
11 – 20
20 – 40
40 – 80
80 – 100
RG()
100k
10k
1k
100
RH()
4.99k
802
80
2
Figure 7. Recommended Circuit for Gain Adjustment
SINGLE-POLE LOW-PASS FILTERING
A low-pass filter can be easily implemented by using the features
provided by the AD626.
By simply connecting a capacitor between Pin 4 and ground,
a single-pole low-pass filter is created, as shown in Figure 8.
+INPUT
–INPUT
–VS
0.1F
–IN 200k
1
200k+IN
8
2 ANALOG
GND
1/6
G = 30
G = 10
7
NOT
CONNECTED
3 –VS
100k
FILTER
4
AD626
+VS 6
OUT
G=2
5
+VS
0.1F
OUTPUT
–INPUT
CF
–IN 200k
1
200k+IN
8
2
ANALOG
GND
1/6
G = 30
G = 100 7
3 –VS
100k
FILTER
4
AD626
+VS 6
OUT
G=2
5
+10V
0.1F
OUTPUT
Figure 5. AD626 Configured for a Gain of 10
CORNER FREQUENCY OF FILTER =
1
2CF (100k)
Figure 8. A One-Pole Low-Pass Filter Circuit
Which Operates from a Single +10 V Supply
–10–
REV. D

12 Page





SeitenGesamt 14 Seiten
PDF Download[ AD626 Schematic.PDF ]

Link teilen




Besondere Datenblatt

TeilenummerBeschreibungHersteller
AD620Low Power Instrumentation AmplifierAnalog Devices
Analog Devices
AD621Low Drift/ Low Power Instrumentation AmplifierAnalog Devices
Analog Devices
AD622Low Cost Instrumentation AmplifierAnalog Devices
Analog Devices
AD623Low Cost Instrumentation AmplifierAnalog Devices
Analog Devices
AD62384AF8CH LOW INPUT ACTIVE DARLINGTON SINK DRIVERToshiba Semiconductor
Toshiba Semiconductor

TeilenummerBeschreibungHersteller
CD40175BC

Hex D-Type Flip-Flop / Quad D-Type Flip-Flop.

Fairchild Semiconductor
Fairchild Semiconductor
KTD1146

EPITAXIAL PLANAR NPN TRANSISTOR.

KEC
KEC


www.Datenblatt-PDF.com       |      2020       |      Kontakt     |      Suche