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PDF AD8293G160 Data sheet ( Hoja de datos )
| Número de pieza | AD8293G160 | |
| Descripción | Zero-Drift In-Amp | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Low Cost, Zero-Drift In-Amp
with Filter and Fixed Gain
AD8293G80/AD8293G160
FEATURES
Small package: 8-lead SOT-23
Reduced component count
Incorporates gain resistors and filter resistors
Low offset voltage: 20 μV maximum
Low offset drift: 0.3 μV/°C maximum
Low gain drift: 25 ppm/°C maximum
High CMR: 140 dB typical
Low noise: 0.7 μV p-p from 0.01 Hz to 10 Hz
Single-supply operation: 1.8 V to 5.5 V
Rail-to-rail output
Available in 2 fixed-gain models
APPLICATIONS
Current sensing
Strain gauges
Laser diode control loops
Portable medical instruments
Thermocouple amplifiers
GENERAL DESCRIPTION
The AD8293G80/AD8293G160 are small, low cost, precision
instrumentation amplifiers that have low noise and rail-to-rail
outputs. They are available in two fixed-gain models: 80 and 160.
They incorporate the gain setting resistors and filter resistors,
reducing the number of ancillary components. For example,
only two external capacitors are needed to implement a 2-pole
filter. The AD8293G80/AD8293G160 also feature low offset
voltage, offset drift, and gain drift coupled with high common-
mode rejection. They are capable of operating on a supply of
1.8 V to 5.5 V.
With a low offset voltage of 20 μV (AD8293G160B), an offset
voltage drift of 0.3 μV/°C, and a voltage noise of only 0.7 μV p-p
(0.01 Hz to 10 Hz), the AD8293G80/AD8293G160 are ideal
for applications where error sources cannot be tolerated.
FUNCTIONAL BLOCK DIAGRAM
7
+VS
56
FILT OUT
8 +IN
R1
4kΩ
–IN
1
R2
IN-AMP
R3
5kΩ
4
ADC OUT
GND REF
23
AD8293Gxx
Figure 1.
OUTPUT TO ADC
WITH ANTIALIASING
FILTER
+5V
0.1µF
C2
7
+VS
56
FILT OUT
LOAD
+IN
8
R2
I
RSHUNT
R1
4kΩ
IN-AMP
1.8V
–IN
1
DC-DC
GND REF
23
R3
5kΩ
4
ADC OUT
AD8293Gxx
ADC
C3
REF
+3.3V
0.1µF
10µF
www.DataSheet.co.kr
Figure 2. Measuring Current Using the AD8293G80/AD8293G160
Table 1. AD8293Gxx Models and Gains
Model
Gain
AD8293G80
80
AD8293G160
160
Precision instrumentation, position and pressure sensors,
medical instrumentation, and strain gauge amplifiers benefit
from the low noise, low input bias current, and high common-
mode rejection. The small footprint and low cost are ideal for
high volume applications.
The small package and low power consumption allow the maxi-
mum channel density and the minimum board size required for
portable systems. Designed for ease of use, these instrumentation
amplifiers, unlike more traditional ones, have a buffered reference,
eliminating the need for an additional op amp to set the reference
voltage to midsupply.
The AD8293G80/AD8293G160 are specified over the industrial
temperature range from −40°C to +85°C. The AD8293G80/
AD8293G160 are available in a halogen-free, Pb-free, 8-lead SOT-23.
Rev. 0
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
www.analog.com
Fax: 781.461.3113
©2008 Analog Devices, Inc. All rights reserved.
Datasheet pdf - http://www.DataSheet4U.net/
1 page  
ABSOLUTE MAXIMUM RATINGS
Table 4.
Parameter
Supply Voltage
Input Voltage
Differential Input Voltage1
Output Short-Circuit Duration to GND
Storage Temperature Range (RJ Package)
Operating Temperature Range
Junction Temperature Range (RJ Package)
Lead Temperature (Soldering, 10 sec)
Rating
6V
+VSUPPLY
±VSUPPLY
Indefinite
−65°C to +150°C
−40°C to +85°C
−65°C to +150°C
300°C
1 Differential input voltage is limited to ±5.0 V, the supply voltage, or
whichever is less.
AD8293G80/AD8293G160
Stresses 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.
THERMAL RESISTANCE
θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.
Table 5.
Package Type
8-Lead SOT-23 (RJ)
θJA1
211.5
θJC
91.99
Unit
°C/W
1 θJA is specified for the nominal conditions, that is, θJA is specified for the
device soldered on a circuit board.
ESD CAUTION
www.DataSheet.co.kr
Rev. 0 | Page 5 of 16
Datasheet pdf - http://www.DataSheet4U.net/
5 Page 
AD8293G80/AD8293G160
APPLICATIONS INFORMATION
OVERVIEW
The AD8293G80/AD8293G160 reduce board area by integrating
filter components, such as Resistors R1, R2, and R3, as shown in
Figure 19. Two outputs are available to the user: OUT (Pin 6) and
ADC OUT (Pin 4). The difference between the two is the inclusion
of a series 5 kΩ resistor at ADC OUT. With the addition of an
external capacitor, C3, ADC OUT forms a second filter, comprising
of the 5 kΩ resistor and C3, which can be used as an ADC anti-
aliasing filter. In contrast, OUT is the direct output of the instru-
mentation amplifier. When using the antialiasing filter, there is
slightly less switching ripple at ADC OUT than when obtaining
the signal directly from OUT.
+5V
0.1µF
C2
680pF
7
+VS
56
FILT OUT
8 +IN
R1
4kΩ
–IN
1
R2
320kΩ
IN-AMP
OUTPUT TO ADC
R3
5kΩ
WITH ANTIALIASING
FILTER
4
ADC OUT
C3
39nF
GND REF
23
AD8293G160
+5V
100kΩ
0.1µF 100kΩ
Figure 19. AD8293G160 with Antialiasing Filter and Level-Shifted Output
(Using the Resistor Divider at the REF Pin, the Output Is Biased at 2.5 V)
REFERENCE CONNECTION
Unlike traditional 3-op-amp instrumentation amplifiers, parasitic
resistance in series with REF (Pin 3) does not degrade CMR
performance. The AD8293G80/AD8293G160 can attain extremely
high CMR performance without the use of an external buffer
amplifier to drive the REF pin, which is required by industry-
standard instrumentation amplifiers. Reducing the need for
buffer amplifiers to drive the REF pin helps to save valuable
printed circuit board (PCB) space and minimizes system costs.
For optimal performance in single-supply applications, REF
should be set with a low noise precision voltage reference, such
as the ADR44x (see Figure 20). However, for a lower system cost,
the reference voltage can be set with a simple resistor voltage
divider between the supply and GND (see Figure 19). This
configuration results in degraded output offset performance if
the resistors deviate from their ideal values. In dual-supply
applications, VREF can simply be connected to GND.
The REF pin current is approximately 10 pA, and as a result, an
external buffer is not required.
+5V
0.1µF
7
+VS
C2
OUTPUT
56
FILT OUT
8 +IN
R1
4kΩ
1 –IN
R2
IN-AMP
R3
5kΩ
4
ADC OUT
GND REF
23
AD8293Gxx
0.1µF
VOLTAGE
REFERENCE
0.1µF
1µF
Figure 20. Operating on a Single Supply Using an External Voltage Reference
(The Output Can Be Used Without an Antialiasing Filter if the Signal
Bandwidth Is <10 Hz)
OUTPUT FILTERING
The output of the AD8293G80/AD8293G160 can be filtered to
reduce switching ripple. Two filters can be used in conjunction
to set the filter frequency. In the example that follows, two 700 Hz
filters are used in conjunction to form a 500 Hz (recommended)
bandwidth. Because the filter resistors are integrated in the
www.DataSheet.co.kr AD8293G80/AD8293G160, only external capacitors are needed
to set the filter frequencies.
The primary filter is needed to limit the amount of switching
noise at the output. Regardless of the output that is being used,
OUT or ADC OUT, the primary filter comprising R2 and C2
must be implemented. The R2 value depends on the model; Table 7
shows the R2 value for each model.
Table 7. Internal R2 Values
Model
AD8293G80
AD8293G160
R2 (kΩ)
160
320
The following equation results in the C2 value needed to set a
700 Hz primary filter. For a gain of 160, substitute R2 with
320 kΩ; for a gain of 80, substitute R2 with 160 kΩ.
C2 = 1/(700 × 2 × π × R2)
Adding an external capacitor, C3, and measuring the output from
ADC OUT further reduces the correction ripple. The internal
5 kΩ resistor, labeled R3 in Figure 18, forms a low-pass filter
with C3. This low-pass filter is the secondary filter. Set to
700 Hz, the secondary filter equation for C3 is as follows:
C3 = 1/(700 × 2 × π × 5 kΩ)
Rev. 0 | Page 11 of 16
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