AD623 single-supply single-ended/differential nanovolt signal low noise programmable gain amp instrumental amplifier
Name: AD620/623 Instrument Programmable Amplifier
Power supply: 5V-24V can be, but you have to look at the baby with the voltage output (if the customer requires 5V voltage output, then the AD62X series chip is about 3.8V power supply, the voltage regulator chip itself has a pressure difference, so it is recommended to be higher than 12V Power supply is better)
Size: 50mm X 50mm
Bandwidth: AD620/623 is lower than 50KHz at high gain and greater than 1MHz at low gain
Input signal type: single-ended signal or differential signal
Maximum magnification: greater than 2000 times (measured), due to gain convolution caused by large fluctuations in the waveform band, it is recommended to use multi-stage amplification for high gain
Saturated output amplitude: AC peak is 10Vpp (±5Vpp)
Output voltage: 5V-10V (default delivery 5V)
Features:
The AD620 is a low cost, high precision instrumentation amplifier that requires only one external resistor to set the gain from 1 to 10,000. This module can be enlarged by 1000 times, the circuit layout is regular, the MINI, the design layout and wiring are reasonable, the materials are generous, suitable for project development and student competition. The store's latest AD620 has two models, one for the fixed gain version (with metal shield cover), the other for the adjustable gain version (without metal shield cover), both models have a fixed voltage output, the store to meet The customer needs, when it is shipped, it does not weld, but it is equipped with a shielding cover + sliding, and the user can choose according to his own needs.
Application Suggestions: 1. This module is suitable for amplification of signals above 100 microvolts. In addition, although the maximum magnification given in the official manual is 10,000 times, this value cannot be achieved in actual use. Different frequencies The amplification effect of the input signal of different sizes may be different. The actual amplification factor is affected by the gain bandwidth product and the power supply voltage, that is, the maximum output of the operational amplifier does not exceed the power supply voltage.
2. The amplifier's gain-bandwidth product (designated as GBWP, GBW, GBP, or GB) is the product of the amplifier's bandwidth and bandwidth gain, and is a parameter used to simply measure the performance of the amplifier. The gain bandwidth product is a constant when the frequency is large enough. For example, the gain bandwidth product of the AD623 is 800KHz, which means that when the frequency is 800Khz, the gain of the device drops to unity gain. That is, A=1 at this time. Also note that this amplifier can operate at up to 800KHz without distorting the input signal. Since the product of gain and frequency is deterministic, it can only operate at up to 80 kHz when the same device needs to get 10 times the gain.
Parameter
Saturation output amplitude: AC peak 10Vpp (±5Vpp)
Fixed output voltage: 5V-10V (default delivery 5V)
Bandwidth: AD620/623 is lower than 50KHz at high gain and greater than 1MHz at low gain
Input signal type: single-ended signal or differential signal
The maximum magnification: more than 2000 times (actual measurement), due to the gain assembly resulting in greater fluctuations in the waveform band, it is recommended to use high-gain multi-stage amplification
Features
The AD620 is a high-precision instrumentation amplifier that requires only one external resistor to set the gain. The gain range is from 1 to 10,000. Low noise, excellent DC performance (Class B). This module can be enlarged 1000 times.
DC performance (Class B)
| Input offset voltage | 50 pV (max) |
| Input offset drift | 0.6 pV/C (max) |
| Input bias current | 1.0 nA (maximum), |
| Common mode rejection ratio | 100 dB (minimum, G=10) |
Low noise
Input voltage noise: 9 nV/VHz (1 kHz)
0.28 pV peak-to-peak noise (0.1 Hz to 10 Hz)
Application
Electronic scale
ECG and medical instruments
Sensor interface
data collection system
Industrial process control
Battery-powered portable devices
The differentce between AD620/AD623
In actual use, the AD623 is better than the AD620. First, the AD623 can be powered by a single power supply. It is a rail-to-rail op amp, but the AD623 (±6V@max) has a much smaller power supply than the AD620 (±18V@max). Therefore, the AD623 is more suitable for integration in low power and low voltage applications. Secondly, the internal bias of the AD623 is indeed much smaller than that of the AD620. When we actually debug the module, we found that the AD623 basically does not need to adjust the bias. The AC signal is basically symmetrical with respect to the zero point, but the AD620 needs to adjust the special bias circuit. The DC component is eliminated and the effect of zero point symmetry is achieved. Finally, the AD623 and AD620 have different bandwidths, and the AD620 has a slightly wider bandwidth than the AD623.
Module gain test: (1KHz signal test, input amplitude is 2mVpp)
Maximum gain output: 3.3Vpp amplification is greater than 1500 times (we can see that the in-band waveform is undulating, which is normal)
Output peak value: about 1Vpp Gain multiple: 500 times (we can see that the gain is small, the waveform is flat inside)
Module maximum output AC signal amplitude saturation test: input 1KHz signal, output ±5Vpp = 10Vpp to reach the maximum output peak of the module
Module frequency output display:
1Hz test signal
100KHz test signal