AD8421 Single Supply Microvolt Small Millivolt Signal Instrumentation Amplifier

Description

AD8421Single Supply microvolt small millivolt signal instrumentation amplifier
Description
NOTE ： we shipped it Single power supply
if you want Dual power ,pls tell me
pplications requires high channel system outstanding performance. The current feedback architecture guarantees high performance even at high gains. For example, when G = 100, the bandwidth is 2 MHz and the settling time is 0.8 μs. The AD8421 has excellent distortion performance for demanding applications such as vibration analysis.
The AD8421 provides 3 nV/√Hz input voltage noise and 200 fA/√Hz current-noise performance with a quiescent current of only 2 mA, making it ideal for measuring low-level signals. For applications with large source impedance, the AD8421 uses innovative process technology and design techniques to provide sensor-limited noise performance.
The AD8421 features a unique protection method that guarantees robust input while maintaining extremely low noise. With this protection, even if the difference between the input voltage and the opposite supply rail reaches 40 V, it will not cause damage.
The gain can be set from 1 to 10,000 by a resistor. The reference pin can be used to apply an accurate offset to the output voltage.
The AD8421 is specified over the −40°C to +85°C temperature range and guarantees typical performance curves up to 125°C in 8-lead MSOP and SOIC packages.
Third, technical indicators
1, low power consumption:
The maximum supply current is 2.3 mA.
2, low noise:
The maximum input voltage noise at 1 kHz is 3.2 nV/√Hz;
Current noise at 1 kHz: 200 fA/√Hz (at 1 kHz).
3. Excellent communication characteristics:
Bandwidth: 10 MHz (G = 1);
Bandwidth: 2 MHz (G = 100);
0.001% settling time: 0.6 μs (G = 10);
Common mode rejection ratio (CMRR): 80 dB (20 kHz, G = 1).
35 V/μs slew rate
4, high precision DC performance (AD8421BRZ)
CMRR: 94 dB (minimum, G = 1)
Input offset voltage drift: 0.2 μV/°C (max)
Maximum gain drift: 1 ppm/°C (G = 1)
Input bias current: 500 pA (max)
5, wide power range:
Single power supply from 5V to 36V;
Dual power supply: ±2.5 V to ±18 V.
6, input overvoltage protection:
Input overvoltage protection can exceed 40V of reverse power supply
7. Gain:
Gain is set by a single resistor (G = 1 to 10,000)
Schematic description:
1. Single power supply mode:
If the input signals (IN- and IN+) are in the positive supply range of 0~VCC (differential signal with DC offset), the module only needs a single power supply. At this time, disconnect J10, J11; turn on J7, J8, J6, at this time, the module works in a single power state, and the DC bias voltage can be input from the SMA3 (or J4) terminal (or J6 is turned on, and the bias voltage is set by the potentiometer).
2, using dual power supply mode:
The input voltage is dual power supply, the default delivery: disconnect J7, J11; turn on J10, J8, J7
The input voltage is a single power supply and the negative voltage module needs to be converted. The default delivery: disconnect J5; turn on J10, J11, J8, J6
If the input signal (IN- and IN+) contains a negative voltage component or a pure AC signal, the module needs dual power supply. At this time, disconnect J7; turn on J8, J10, J11. At this time, the module works in dual power state, which can be Input the DC bias voltage on the SMA3 (or J4) terminal (or turn on J7 and set the bias voltage by the potentiometer).
Output signal Vout=[(Vin+)-(Vin-)]*G+Vref
G = 1 + (9.9 kΩ/RG)
package :
1pc AD8421Single Supply microvolt small millivolt signal instrumentation amplifier
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