Overview
The AD7124-4BCPZ-RL7, produced by Analog Devices Inc., is a low power, low noise, completely integrated analog front end designed for high precision measurement applications. This device features a 24-bit Σ-Δ analog-to-digital converter (ADC) and can be configured to have four differential inputs or seven single-ended or pseudo differential inputs. The on-chip low gain stage allows signals of small amplitude to be interfaced directly to the ADC. The AD7124-4 offers three integrated power modes, enabling flexibility in current consumption, output data rates, and rms noise. It also includes a precision, low noise, low drift internal band gap reference and accepts an external differential reference.
Key Specifications
| Specification | Value |
|---|---|
| Number of Channels | 4 (differential), 7 (single-ended or pseudo differential) |
| Resolution | 24-bit |
| Power Modes | Low Power, Mid Power, Full Power |
| Current Consumption (Typical) | 255 µA (Low Power), 355 µA (Mid Power), 930 µA (Full Power) |
| RMS Noise (Typical) | 24 nV rms at 1.17 SPS (Low Power), 20 nV rms at 2.34 SPS (Mid Power), 23 nV rms at 9.4 SPS (Full Power) |
| Output Data Rates | Up to 25 SPS |
| Filter Options | Simultaneous 50 Hz and 60 Hz rejection, rejection in excess of 80 dB at lower output data rates |
| Reference | Internal band gap reference, external differential reference |
| Power Supply | Single analog power supply: 2.7 V to 3.6 V, Dual 1.8 V power supply; Digital supply: 1.65 V to 3.6 V |
| Temperature Range | −40°C to +105°C |
| Package | 32-Lead LFCSP (5mm x 5mm x 0.75mm), 24-Lead TSSOP |
Key Features
- Low noise, low power 24-bit Σ-Δ ADC with PGA and reference.
- Three integrated power modes for flexible current consumption and noise performance.
- Programmable low drift excitation current sources, burnout currents, and bias voltage generator.
- Low-side power switch for minimal power consumption.
- Option to operate with internal or external clock.
- Integrated channel sequencer for sequential conversion of multiple channels.
- Per channel configuration for gain, filter type, output data rate, buffering, and reference source.
- Extensive diagnostic functionality including CRC, signal chain checks, and serial interface checks.
Applications
The AD7124-4 is suitable for various high precision measurement applications, including:
- Industrial automation and control systems.
- Medical devices requiring high accuracy and low noise.
- Aerospace and defense applications, supported by the AD7124-4-EP model which meets AQEC standards.
- Test and measurement equipment.
- Smart energy management systems.
Q & A
- What is the resolution of the AD7124-4 ADC?
The AD7124-4 has a 24-bit resolution.
- How many power modes does the AD7124-4 offer?
The AD7124-4 offers three integrated power modes: Low Power, Mid Power, and Full Power.
- What is the typical current consumption of the AD7124-4 in each power mode?
The typical current consumption is 255 µA (Low Power), 355 µA (Mid Power), and 930 µA (Full Power).
- Can the AD7124-4 reject both 50 Hz and 60 Hz noise?
Yes, the AD7124-4 can achieve simultaneous 50 Hz and 60 Hz rejection with rejection in excess of 80 dB at lower output data rates.
- What types of references does the AD7124-4 support?
The device supports an internal band gap reference and an external differential reference.
- What is the operating temperature range of the AD7124-4?
The operating temperature range is −40°C to +105°C.
- What package options are available for the AD7124-4?
The device is available in a 32-Lead LFCSP package and a 24-Lead TSSOP package.
- Does the AD7124-4 support per channel configuration?
Yes, the device allows per channel configuration for gain, filter type, output data rate, buffering, and reference source.
- What diagnostic features are integrated into the AD7124-4?
The device includes extensive diagnostic functionality such as CRC, signal chain checks, and serial interface checks.
- Is the AD7124-4 suitable for aerospace and defense applications?
Yes, the AD7124-4-EP model meets AQEC standards and is suitable for aerospace and defense applications.
