Overview
The AD8231ACPZ-RL, produced by Analog Devices Inc., is a low drift, rail-to-rail instrumentation amplifier designed for precision performance over a wide temperature range. This device is ideal for applications such as industrial temperature sensing, data logging, and other scenarios requiring high accuracy and stability. The AD8231 features software-programmable gains of 1, 2, 4, 8, 16, 32, 64, or 128, which can be set via digital logic or pin strapping. It also includes an uncommitted op amp for additional gain, differential signal driving, or filtering.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Gain | 1 | 128 | |||
| Input Offset Voltage | TA = −40°C to +125°C | 4 | 15 | µV | |
| Input Offset Drift | TA = −40°C to +125°C | 0.01 | 0.05 | µV/°C | |
| Gain Drift | TA = −40°C to +125°C, G = 1 to 32 | 3 | 10 | ppm/°C | |
| CMRR | G = 1 | 80 | dB | ||
| Bandwidth | G = 1 | 2.7 | MHz | ||
| Slew Rate | 1.1 | V/µs | |||
| Output Voltage High | RL = 100 kΩ to ground | 4.9 | 4.94 | V | |
| Output Voltage Low | RL = 100 kΩ to 3 V | 60 | 100 | mV | |
| Short-Circuit Current | 40 | mA | |||
| Power Supply | 3.0 | 5.5 | V | ||
| Package | 16-Lead LFCSP (4mm x 4mm) |
Key Features
- Software-programmable gains of 1, 2, 4, 8, 16, 32, 64, or 128 via digital logic or pin strapping.
- Low drift and high precision performance over a wide temperature range (−40°C to +125°C).
- Auto-zero input stage with maximum input offset of 15 µV and maximum input offset drift of 50 nV/°C.
- High CMRR of 80 dB for G = 1, increasing to 110 dB at higher gains.
- Includes an uncommitted op amp with auto-zero architecture, rail-to-rail input, and rail-to-rail output.
- Shutdown feature reducing current to a maximum of 1 µA and high output impedance for easy multiplexing.
- Low noise: 0.7 µV p-p (0.1 Hz to 10 Hz).
Applications
- Pressure and strain transducers
- Thermocouples and RTDs
- Programmable instrumentation
- Industrial controls
- Weigh scales
- Automotive controls.
Q & A
- What are the programmable gain options for the AD8231?
The AD8231 has software-programmable gains of 1, 2, 4, 8, 16, 32, 64, or 128.
- What is the temperature range for the AD8231?
The AD8231 is specified over the extended industrial temperature range of −40°C to +125°C.
- What is the maximum input offset voltage of the AD8231?
The maximum input offset voltage is 15 µV.
- What is the maximum gain drift of the AD8231?
The maximum gain drift is 10 ppm/°C for gains of 1 to 32.
- Does the AD8231 include an additional op amp?
Yes, the AD8231 includes an uncommitted op amp for additional gain, differential signal driving, or filtering.
- What is the CMRR of the AD8231?
The CMRR is 80 dB for G = 1, increasing to 110 dB at higher gains.
- What is the bandwidth of the AD8231 at a gain of 1?
The bandwidth at a gain of 1 is 2.7 MHz.
- What is the slew rate of the AD8231?
The slew rate is 1.1 V/µs.
- Does the AD8231 have a shutdown feature?
Yes, the AD8231 includes a shutdown feature that reduces current to a maximum of 1 µA.
- What are some common applications of the AD8231?
Common applications include pressure and strain transducers, thermocouples, programmable instrumentation, industrial controls, weigh scales, and automotive controls.
