Overview
Single and Dual-Supply, Rail-to-Rail, Low Cost Instrumentation Amplifier
Specifications
- Rail to Rail Instrumentation Amplifier
- Can operate and Single and Dual supply voltage
- Operating current: 550uA (max)
- Gain Range: 1 to 1000
- Bandwidth: 800KHz
- Set gain with only one resistor
- Available in 8-Pin PDIP,SOIC and VSSOP packages
Pinout
Pin Number | Pin Name | Description |
1 | Gain (-Rg) | Inverting Gain Terminal connected to resistor to set gain value |
2 | Inverting Input (IN-) | The Inverting input pin of the Op-Amp |
3 | Non-Inverting Input (IN-) | The Non-Inverting Input Pin of Amplifier |
4 | Power (-Vs) | Negative supply terminal |
5 | Reference | Output reference input. Normally connected to common |
6 | Output | Amplifier output pin |
7 | Power (+Vs) | Positive supply terminal |
8 | Gain (+Rg) | Non - Inverting Gain Terminal connected to resistor to set gain value |
How to use AD623 IC
The AD623 only requires a resistor to sets its gain value and hence can be easily set up. A very basic commonly used circuit for the AD623 is shown below.
The IC is powered using the pin 7 and pin 4, here I have used a singly supply of +5V hence the pin 4 is grounded. If a dual supply voltage is used the pin 4 will be provided with negative voltage. The non - inverting pin (pin 2) and the inverting pin (pin 3) is connected the signal which has to be amplified or compared base on the application of the Op-Amp. The Reference pin (pin 5) is normally grounded along with pin 4, the reference pin is used to direct the output towards a voltage when the difference voltage between the inverting and the non-inverting pin is 0V.
The Gain of an Op-Amp can be set by simply connecting the right value of resistor across the pin +Rg (pin 8) and the pin –Rg (pin 1). Here I have connected a resistor of value 500Ω which will set the Op-Amp at a gain value of 100. The formulae to calculate the value of gain from R is given below
Alternatively you can also use the chart below which has the value of resistor and standard gain values listed.
DKARDU AD623 Millivolt Voltage Amplifier Module
References
| Reference | URL |
|---|---|
| Datasheet | https://www.analog.com/media/en/technical-documentation/data-sheets/ad623.pdf |
| Amazon Link | Amazon.ca Link |
| AD623 Instrumentation Amplifier IC | https://components101.com/ics/ad623-instrumentation-amplifier-pinout-datasheet |