Overview
The AD7124-4, manufactured by Analog Devices Inc., is a low power, low noise, 24-bit Sigma-Delta analog-to-digital converter (ADC) designed for high precision measurement applications. This device is part of a completely integrated analog front end, offering flexibility and high accuracy. It can be configured to have four differential inputs or seven single-ended or pseudo differential inputs, making it versatile for various signal conditioning needs. The AD7124-4 is ideal for applications in industrial instrumentation, medical devices, and automotive systems due to its low power consumption and high accuracy.
Key Specifications
| Parameter | Description |
|---|---|
| Number of Channels | 4 (differential or 7 single-ended/pseudo differential) |
| Resolution | 24-bit |
| Converter Type | Sigma-Delta ADC |
| Power Modes | Low, Mid, Full power modes |
| Power Consumption | Low power: 255 µA typical, Mid power: 355 µA typical, Full power: 930 µA typical |
| RMS Noise | Low power: 24 nV rms at 1.17 SPS, Mid power: 20 nV rms at 2.34 SPS, Full power: 23 nV rms at 9.4 SPS |
| Output Data Rate | Up to 19.2 ksps |
| Analog Supply Voltage | 2.7 V to 3.6 V (single supply), 1.8 V (dual supply) |
| Digital Supply Voltage | 1.65 V to 3.6 V |
| Operating Temperature | -40°C to +105°C |
| Package | 32-Lead LFCSP (5mm x 5mm x 0.75mm w/ EP), 24-Lead TSSOP |
Key Features
- Low noise and low power consumption, making it suitable for battery-powered and energy-harvesting applications.
- Three integrated power modes allowing for tailored current consumption, output data rates, and rms noise.
- Multitude of filter options and simultaneous 50 Hz and 60 Hz rejection.
- Precision, low noise, low drift internal band gap reference and external differential reference capability.
- Programmable low drift excitation current sources, burnout currents, and a bias voltage generator.
- Low-side power switch for minimal power consumption and integrated channel sequencer for simplified communication.
- Per channel configuration with up to eight different setups.
- Extensive diagnostic functionality including cyclic redundancy check (CRC), signal chain checks, and serial interface checks.
Applications
- Industrial instrumentation: Suitable for high precision measurement applications in industrial settings.
- Medical devices: Ideal for medical applications requiring low noise and high accuracy.
- Automotive systems: Used in automotive applications due to its robustness and low power consumption.
- Battery-powered and energy-harvesting applications: Optimized for low power consumption, making it suitable for these types of applications.
Q & A
- What is the resolution of the AD7124-4 ADC?
The AD7124-4 has a 24-bit resolution.
- How many channels does the AD7124-4 support?
The device supports up to 4 differential or 7 single-ended/pseudo differential channels.
- What are the power modes available for the AD7124-4?
The device has three integrated power modes: Low, Mid, and Full power modes.
- What is the typical power consumption of the AD7124-4 in different power modes?
The typical power consumption is 255 µA in Low power mode, 355 µA in Mid power mode, and 930 µA in Full power mode.
- What is the operating temperature range of the AD7124-4?
The device operates from -40°C to +105°C.
- Can the AD7124-4 reject 50 Hz and 60 Hz noise?
Yes, it can achieve simultaneous 50 Hz and 60 Hz rejection with rejection in excess of 80 dB at lower output data rates.
- What types of packages are available for the AD7124-4?
The device is available in 32-Lead LFCSP and 24-Lead TSSOP packages.
- Does the AD7124-4 support external clock operation?
Yes, the device allows operation with either an internal clock or an external clock.
- What diagnostic features are integrated into the AD7124-4?
The device includes cyclic redundancy check (CRC), signal chain checks, and serial interface checks.
- Can the AD7124-4 be used in defense and aerospace applications?
Yes, the AD7124-4-EP version supports defense and aerospace applications and meets AQEC standards.
