Overview
The AD8420ARMZ-R7, produced by Analog Devices Inc., is a low-cost, micropower, wide supply range instrumentation amplifier. It features a rail-to-rail output and a novel architecture that allows for extremely flexible design. This amplifier is optimized to amplify small differential voltages in the presence of large common-mode signals, making it ideal for various applications in medical, industrial, and consumer electronics. The AD8420 is based on an indirect current feedback architecture, which provides an excellent input common-mode range and allows it to amplify signals at or even slightly below ground without requiring dual supplies.
Key Specifications
| Parameter | Value | Conditions |
|---|---|---|
| Maximum Supply Current | 90 μA | - |
| Minimum CMRR | 100 dB | - |
| Input Voltage Noise | 55 nV/√Hz | - |
| Bandwidth (G = 100) | 2.5 kHz | - |
| Supply Voltage Range | Single supply: 2.7 V to 36 V, Dual supply: ±2.7 V to ±18 V | - |
| Input Bias Current | 1.1 nA max | - |
| Input Offset Voltage | 2 mV max | - |
| Output Swing | Rail-to-rail | - |
| Temperature Range | -40°C to +125°C (operational), -40°C to +85°C (specified) | - |
| Package | 8-lead MSOP | - |
Key Features
- Rail-to-rail output stage, maximizing dynamic range when operating from low supply voltages.
- Wide supply range: single supply from 2.7 V to 36 V, and dual supply from ±2.7 V to ±18 V.
- Micropower current consumption: 90 μA maximum supply current.
- Excellent input common-mode range, allowing signal amplification at or below ground without dual supplies.[
- Low input offset voltage and input bias current.[
- Gain set with two external resistors, achieving low gain drift at any gain.[
- Ability to drive heavy capacitive loads (~700 pF).[
Applications
The AD8420ARMZ-R7 is suitable for a variety of applications, including:
- Medical instrumentation: due to its low power consumption and high accuracy, it is ideal for battery-powered medical devices.
- Industrial instrumentation: its wide supply range and low drift characteristics make it suitable for industrial applications such as 4 mA to 20 mA current loops.[
- Consumer electronics: its flexibility and low cost make it a good choice for various consumer electronic devices.[
- Battery-powered applications: the rail-to-rail output and micropower consumption make it ideal for battery-powered systems.[
Q & A
- What is the maximum supply current of the AD8420ARMZ-R7?
The maximum supply current is 90 μA.
- What is the input voltage noise of the AD8420ARMZ-R7?
The input voltage noise is 55 nV/√Hz.[
- What is the bandwidth of the AD8420ARMZ-R7 at a gain of 100?
The bandwidth at a gain of 100 is 2.5 kHz.[
- What is the supply voltage range for the AD8420ARMZ-R7?
The supply voltage range is from 2.7 V to 36 V for single supply and ±2.7 V to ±18 V for dual supply.[
- What type of package does the AD8420ARMZ-R7 come in?
The AD8420ARMZ-R7 comes in an 8-lead MSOP package.[
- What is the temperature range for the AD8420ARMZ-R7?
The device is operational from -40°C to +125°C and specified from -40°C to +85°C.[
- Can the AD8420ARMZ-R7 amplify signals below ground without dual supplies?
- What is the input bias current of the AD8420ARMZ-R7?
The input bias current is 1.1 nA max.[
- What are some typical applications for the AD8420ARMZ-R7?
- How is the gain set for the AD8420ARMZ-R7?
- Can the AD8420ARMZ-R7 drive heavy capacitive loads?
