Analog Devices Inc. ADA4254 High Voltage Low Power PGIA
Analog Devices Inc. ADA4254 High Voltage Low Power Programmable Gain Instrumentation Amplifier (PGIA) is designed for process control and industrial applications. The ADA4254 features twelve binary-weighted gains ranging from 1/16 V/V to 128 V/V and three scaling gain options of 1.0 V/V, 1.25 V/V, and 1.375 V/V, resulting in thirty-six possible gain settings. The power consumption of the ADA4254 is only 22mW, making the device an ideal choice for industrial systems that demand precision, robustness, and low power.
The zero-drift amplifier topology of the ADA4254 self calibrates DC errors and low-frequency 1/f noise, achieving excellent DC precision over the entire specified temperature range. This high level of precision maximizes dynamic range and greatly reduces calibration requirements in many applications.
The input multiplexer provides ±60V protection to the high impedance inputs of the amplifier while providing the capability to switch between two input sources. In addition, integrated electromagnetic interference (EMI) filters block harsh RF noise from the sensitive inputs of the amplifier.
Various safety features on the ADA4254 detect both internal and external faults. The serial port interface (SPI) supports cyclical redundancy check (CRC) error detection to ensure robust communication. These safety features ease system safety integrity level (SIL) certification.
Seven general-purpose input/output (GPIO) pins, which can be configured to provide various special functions, are included in the ADA4254. An excitation current source output is available to bias sensors such as resistance temperature detectors (RTDs).
The ADA4254 is specified over a -40°C to +105°C temperature range and is offered in a compact 5mm x 5mm, 28-lead LFCSP, and a 24-lead TSSOP.
Features
- Optimized for ADC synchronization
- Low power: 22mW (±12V supplies)
- 12 binary gain steps from 1/16 V/V to 128 V/V
- 3 scaling gains: 1 V/V, 1.25 V/V, and 1.375 V/V
- ±60V protected input multiplexer
- Excellent DC precision
- Low input offset voltage: ±14μV maximum
- Low input offset voltage drift: ±0.08μV/°C maximum
- Gain calibration via ROM
- Low gain drift: ±1ppm/°C maximum
- High CMRR: 116dB minimum, G = 1 V/V
- Low input bias current: ±1.5nA maximum
- High input impedance
- Integrated input EMI filtering
- Wide input supply range: ±5V to ±28V
- Dedicated output amplifier supplies
- 7 GPIO ports with special functions
- Sequential chip select mode
- External multiplexer control
- Excitation current sources
- SPI port with checksum (CRC) support
- Internal fault detection
- Wire break test currents
- On-chip test multiplexer
- Operating temperature range: -40°C to +105°C
- Package options
- 28-lead LFCSP
- 24-lead TSSOP
Applications
- Universal process control front ends
- Data acquisition systems
- Test and measurement systems
Development Tools
Analog Devices Inc. EVAL-ADA4254 Evaluation Board
Demonstration platform for the ADA4254 High-Voltage Programmable Gain Instrumentation Amplifier.
Related Products
Analog Devices Inc. AD4020 20-Bit Precision SAR ADC
Low-noise, low-power 20-Bit, 1.8MSPS, Precision SAR, Differential ADCs.
Block Diagram
3-Wire RTD Application
Current Sense Application
Package Outline
