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.
With no external resistor, the AD623 is configured for unity gain (G = 1), and with an external resistor, the AD623 can be programmed for gains of up to 1000.
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 |