Overview
The AD8227ARMZ-R7, produced by Analog Devices Inc., is a low-cost, wide supply range instrumentation amplifier. It is designed to operate with a variety of signal voltages and requires only one external resistor to set any gain between 5 and 1000. The amplifier features a wide input range and rail-to-rail output, allowing the signal to make full use of the supply rails. It can handle input voltages beyond the supply rails, making it robust for connecting to real-world sensors. The AD8227 is ideal for multichannel, space-constrained applications and is fully specified for operation from −40°C to +125°C.
Key Specifications
| Parameter | Value |
|---|---|
| Gain Range | 5 to 1000 |
| Supply Voltage (Single Supply) | 2.2 V to 36 V |
| Supply Voltage (Dual Supply) | ±1.5 V to ±18 V |
| Bandwidth (G = 5) | 250 kHz |
| CMRR (G = 5) | 100 dB minimum (B Grade) |
| Input Noise | 24 nV/√Hz |
| Typical Supply Current | 350 μA |
| Operating Temperature | −40°C to +125°C |
| Package | 8-Lead MSOP |
Key Features
- Single external resistor sets gain between 5 and 1000.
- Wide input range allows signals below the negative supply rail, enabling amplification of small signals near ground without dual supplies.
- Inputs protected beyond supply rails; for example, ±35 V input protection with ±5 V supply.
- Rail-to-rail output for full utilization of supply rails.
- Minimum and maximum input bias currents specified for open wire detection.
- Reference terminal for output voltage offset, useful for driving single-supply ADCs.
Applications
- Multichannel, space-constrained applications due to its compact MSOP package and high temperature rating.
- Real-world sensor connections due to robust input design.
- Driving charge sampling ADCs with appropriate RC buffer stages or additional op-amps for higher frequency signals.
- Applications requiring wide supply range and high gain flexibility.
Q & A
- What is the gain range of the AD8227ARMZ-R7?
The gain range of the AD8227ARMZ-R7 is from 5 to 1000, set by a single external resistor.
- What are the supply voltage ranges for the AD8227ARMZ-R7?
The AD8227ARMZ-R7 operates on single supply voltages from 2.2 V to 36 V and dual supply voltages from ±1.5 V to ±18 V).
- What is the bandwidth of the AD8227ARMZ-R7 at a gain of 5?
The bandwidth at a gain of 5 is 250 kHz).
- How is the gain of the AD8227ARMZ-R7 set?
The gain is set using a single external resistor connected across the RG terminals).
- What is the input noise of the AD8227ARMZ-R7?
The input noise is 24 nV/√Hz).
- What is the typical supply current of the AD8227ARMZ-R7?
The typical supply current is 350 μA).
- What is the operating temperature range of the AD8227ARMZ-R7?
The operating temperature range is from −40°C to +125°C).
- What package types are available for the AD8227ARMZ-R7?
The AD8227ARMZ-R7 is available in an 8-Lead MSOP package).
- How does the AD8227ARMZ-R7 handle input voltages beyond the supply rails?
The AD8227ARMZ-R7 can handle input voltages beyond the supply rails; for example, it can withstand ±35 V at the input with a ±5 V supply).
- What is the purpose of the reference terminal on the AD8227ARMZ-R7?
The reference terminal allows the output voltage to be offset to a precise mid-supply level, useful for driving single-supply ADCs).
