Overview
The AD8231TCPZ-EP-R7, produced by Analog Devices Inc., is a low drift, rail-to-rail, digitally programmable instrumentation amplifier. This component is designed to offer precision performance over a wide temperature range, making it ideal for various industrial and automotive applications. The AD8231 features an auto-zero topology that minimizes offset errors and drift, ensuring high accuracy and stability. It also includes an uncommitted operational amplifier that can be used for additional gain, differential signal driving, or filtering. The device is available in a 4 mm × 4 mm 16-lead LFCSP package and is specified over the extended industrial temperature range of −40°C to +125°C.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Bandwidth (G = 1) | 2.7 | MHz | |||
| Slew Rate | 1.1 | V/μs | |||
| Gain Bandwidth Product (G = 4 to 128) | 7 | MHz | |||
| Input Offset Voltage | 15 | μV | |||
| Input Offset Drift | 50 | nV/°C | |||
| Gain Drift | 10 | ppm/°C | |||
| Common-Mode Rejection Ratio (CMRR) at G = 1 | 80 | dB | |||
| Supply Voltage Range (Single-Supply) | 3 | 5 | V | ||
| Supply Voltage Range (Dual-Supply) | ±1.5 | ±2.5 | V | ||
| Operating Temperature Range | −40 | +125 | °C |
Key Features
- Digitally programmable gain: G = 1, 2, 4, 8, 16, 32, 64, or 128.
- Auto-zero topology for minimal offset errors and drift.
- Rail-to-rail input and output architecture.
- High CMRR: 80 dB at G = 1, increasing to 110 dB at higher gains.
- Low input offset voltage: 15 μV maximum.
- Low input offset drift: 50 nV/°C maximum.
- Shutdown feature reducing current to 1 μA and high output impedance for easy multiplexing.
- Includes an uncommitted operational amplifier for additional gain, differential signal driving, or filtering.
Applications
- Pressure and strain transducers.
- Thermocouples and RTDs.
- Programmable instrumentation.
- Industrial controls.
- Weigh scales.
- Automotive controls.
- Industrial temperature sensing and data logging.
- Defense and aerospace applications (AD8231-EP model).
Q & A
- What is the AD8231TCPZ-EP-R7 used for?
The AD8231TCPZ-EP-R7 is a low drift, rail-to-rail, digitally programmable instrumentation amplifier used in various industrial and automotive applications requiring precision performance over a wide temperature range.
- What are the programmable gain settings of the AD8231?
The AD8231 allows for digitally programmable gains of 1, 2, 4, 8, 16, 32, 64, or 128.
- What is the operating temperature range of the AD8231?
The AD8231 operates over the extended industrial temperature range of −40°C to +125°C.
- What is the significance of the auto-zero topology in the AD8231?
The auto-zero topology minimizes offset errors and drift, ensuring high accuracy and stability by continually correcting for any offset errors.
- Does the AD8231 include any additional amplifiers?
Yes, the AD8231 includes an uncommitted operational amplifier that can be used for additional gain, differential signal driving, or filtering.
- What is the package type of the AD8231TCPZ-EP-R7?
The AD8231TCPZ-EP-R7 is available in a 4 mm × 4 mm 16-lead LFCSP package.
- What are some common applications of the AD8231?
Common applications include pressure and strain transducers, thermocouples and RTDs, programmable instrumentation, industrial controls, weigh scales, and automotive controls.
- Does the AD8231 have a shutdown feature?
Yes, the AD8231 includes a shutdown feature that reduces current to a maximum of 1 μA and increases output impedance for easy multiplexing.
- What is the CMRR of the AD8231 at a gain of 1?
The CMRR at a gain of 1 is 80 dB, increasing to 110 dB at higher gains.
- Is the AD8231 suitable for defense and aerospace applications?
Yes, the AD8231-EP model supports defense and aerospace applications with enhanced specifications and qualifications.
