AD623ARZ Analog Devices Inc, AD623ARZ Datasheet - Page 15

IC AMP INST R-R LP 8SOIC

AD623ARZ

Manufacturer Part Number
AD623ARZ
Description
IC AMP INST R-R LP 8SOIC
Manufacturer
Analog Devices Inc
Type
Low Powerr
Datasheets

Specifications of AD623ARZ

Slew Rate
0.3 V/µs
Amplifier Type
Instrumentation
Number Of Circuits
1
Output Type
Rail-to-Rail
-3db Bandwidth
800kHz
Current - Input Bias
17nA
Voltage - Input Offset
25µV
Current - Supply
375µA
Voltage - Supply, Single/dual (±)
2.7 V ~ 12 V, ± 2.5 V ~ 6 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
No. Of Amplifiers
1
Input Offset Voltage
200µV
Gain Db Min
1dB
Gain Db Max
1000dB
Bandwidth
800kHz
Amplifier Output
Single Ended
Cmrr
110dB
Supply Voltage Range
2.7V To
Common Mode Rejection Ratio
110
Current, Input Bias
17 nA
Current, Input Offset
0.25 nA
Current, Supply
550 μA
Impedance, Thermal
155 °C/W
Package Type
SOIC-N
Power Dissipation
650 mW
Temperature, Operating, Range
-40 to +85 °C
Voltage, Gain
1-1000 V/V
Voltage, Input
-4.85 to +3.5 V
Voltage, Input Offset
25 μV
Voltage, Noise
35 nV/sqrt Hz (Input), 50 nV/sqrt Hz (Output)
Voltage, Output Swing
0.01 to 4.5 V
Voltage, Supply
2.7 to 12 V
Rohs Compliant
Yes
Number Of Channels
1
Number Of Elements
1
Power Supply Requirement
Single/Dual
Input Resistance
2000@5VMohm
Input Bias Current
0.025@5VnA
Single Supply Voltage (typ)
3/5/9V
Dual Supply Voltage (typ)
±3/±5V
Power Supply Rejection Ratio
80dB
Rail/rail I/o Type
Rail to Rail Output
Single Supply Voltage (min)
2.7V
Single Supply Voltage (max)
12V
Dual Supply Voltage (min)
±2.5V
Dual Supply Voltage (max)
±6V
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
8
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Current - Output / Channel
-
Gain Bandwidth Product
-
Lead Free Status / Rohs Status
RoHS Compliant part Electrostatic Device

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THEORY OF OPERATION
The AD623 is an instrumentation amplifier based on a modified
classic 3-op-amp approach, to assure single or dual supply
operation even at common-mode voltages at the negative
supply rail. Low voltage offsets, input and output, as well as
absolute gain accuracy, and one external resistor to set the
gain, make the AD623 one of the most versatile instrumentation
amplifiers in its class.
The input signal is applied to PNP transistors acting as voltage
buffers and providing a common-mode signal to the input
amplifiers (see Figure 41). An absolute value 50 kΩ resistor in
each amplifier feedback assures gain programmability.
The differential output is
The differential voltage is then converted to a single-ended
voltage using the output amplifier, which also rejects any
common-mode signal at the output of the input amplifiers.
Because the amplifiers can swing to either supply rail, as well as
have their common-mode range extended to below the negative
supply rail, the range over which the AD623 can operate is further
enhanced (see Figure 20 and Figure 21).
V
O
=
1
+
100
R
G
V
C
Rev. D | Page 15 of 24
The output voltage at Pin 6 is measured with respect to the
potential at Pin 5. The impedance of the reference pin is 100 kΩ;
therefore, in applications requiring V/I conversion, a small
resistor between Pin 5 and Pin 6 is all that is needed.
Note that the bandwidth of the in-amp decreases as gain is
increased. This occurs because the internal op-amps are the
standard voltage feedback design. At unity gain, the output
amplifier limits the bandwidth.
NONINVERTING
INVERTING
GAIN
1
8
2
3
NEGATIVE SUPPLY
POSITIVE SUPPLY
Figure 41. Simplified Schematic
7
4
7
4
50kΩ
50kΩ
50kΩ
50kΩ
50kΩ
50kΩ
OTUPUT
REF
AD623
6
5

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