AD7124-8
RECOMMENDED FOR NEW DESIGNS8-Channel, Low Noise, Low Power, 24-Bit, Sigma-Delta ADC with PGA and Reference
- Part Models
- 7
- 1ku List Price
- Starting From $6.33
Part Details
- 3 power modes
- RMS noise
- Low power: 24 nV rms at 1.17 SPS, gain = 128 (255 μA typical)
- Mid power: 20 nV rms at 2.34 SPS, gain = 128 (355 μA typical)
- Full power: 23 nV rms at 9.4 SPS, gain = 128 (930 μA typical)
- Up to 22 noise free bits in all power modes (gain = 1)
- Output data rate
- Full power: 9.38 SPS to 19,200 SPS
- Mid power: 2.34 SPS to 4800 SPS
- Low power: 1.17 SPS to 2400 SPS
- Rail-to-rail analog inputs for gains > 1
- Simultaneous 50 Hz/60 Hz rejection at 25 SPS (single cycle settling)
- Diagnostic functions (which aid safe integrity level (SIL) certification)
- Crosspoint multiplexed analog inputs
- 8 differential/15 pseudo differential inputs
- Programmable gain (1 to 128)
- Band gap reference with 10 ppm/°C drift maximum (70 μA)
- Matched programmable excitation currents
- Internal clock oscillator
- On-chip bias voltage generator
- Low-side power switch
- General-purpose outputs
- Multiple filter options
- Internal temperature sensor
- Self and system calibration
- Sensor burnout detection
- Automatic channel sequencer
- Per channel configuration
- Power supply: 2.7 V to 3.6 V and ±1.8 V
- Independent interface power supply
- Power-down current: 5 μA maximum
- Temperature range: −40°C to +125°C
- 32-lead LFCSP
- 3-wire or 4-wire serial interface
- SPI, QSPI™, MICROWIRE™, and DSP compatible
- Schmitt trigger on SCLK
- ESD: 4 kV
- AEC-Q100 qualified for automotive applications
The AD7124-8 is a low power, low noise, completely integrated analog front end for high precision measurement applications. The AD7124-8 W grade is AEC-Q100 qualified for automotive applications. The device contains a low noise, 24-bit Σ-Δ analog-to-digital converter (ADC), and can be configured to have 8 differential inputs or 15 single-ended or pseudo differential inputs. The on-chip low gain stage ensures that signals of small amplitude can be interfaced directly to the ADC.
One of the major advantages of the AD7124-8 is that it gives the user the flexibility to employ one of three integrated power modes. The current consumption, range of output data rates, and rms noise can be tailored with the power mode selected. The device also offers a multitude of filter options, ensuring that the user has the highest degree of flexibility.
The AD7124-8 can achieve simultaneous 50 Hz and 60 Hz rejection when operating at an output data rate of 25 SPS (single cycle settling), with rejection in excess of 80 dB achieved at lower output data rates.
The AD7124-8 establishes the highest degree of signal chain integration. The device contains a precision, low noise, low drift internal band gap reference and accepts an external differential reference, which can be internally buffered. Other key integrated features include programmable low drift excitation current sources, burnout currents, and a bias voltage generator, which sets the common-mode voltage of a channel to AVDD/2. The low-side power switch enables the user to power down bridge sensors between conversions, ensuring the absolute minimal power consumption of the system. The device also allows the user the option of operating with either an internal clock or an external clock.
The integrated channel sequencer allows several channels to be enabled simultaneously, and the AD7124-8 sequentially converts on each enabled channel, simplifying communication with the device. As many as 16 channels can be enabled at any time, a channel being defined as an analog input or a diagnostic such as a power supply check or a reference check. This unique feature allows diagnostics to be interleaved with conversions. The AD7124-8 also supports per channel configuration. The device allows eight configurations or setups. Each configuration consists of gain, filter type, output data rate, buffering, and reference source. The user can assign any of these setups on a channel by channel basis.
The AD7124-8 also has extensive diagnostic functionality integrated as part of its comprehensive feature set. These diagnostics include a cyclic redundancy check (CRC), signal chain checks, and serial interface checks, which lead to a more robust solution. These diagnostics reduce the need for external components to implement diagnostics, resulting in reduced board space needs, reduced design cycle times, and cost savings. The failure modes effects and diagnostic analysis (FMEDA) of a typical application has shown a safe failure fraction (SFF) greater than 90% according to IEC 61508.
The device operates with a single analog power supply from 2.7 V to 3.6 V or a dual 1.8 V power supply. The digital supply has a range of 1.65 V to 3.6 V. It is specified for a temperature range of −40°C to +125°C. The AD7124-8 is housed in a 32-lead LFCSP package.
APPLICATIONS
- Temperature measurement
- Pressure measurement
- Industrial process control
- Instrumentation
- Smart transmitters
Documentation
Data Sheet 1
User Guide 2
Application Note 3
Technical Articles 6
Frequently Asked Question 1
Video 8
Circuit Note 6
Device Drivers 2
3rd Party Solutions 1
Analog Dialogue 5
Student Zone Article page 1
Rarely Asked Question Page 1
Webcast 4
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| AD7124-8BBCPZ | 32-Lead LFCSP (5mm x 5mm x 0.95mm w/ EP) | ||
| AD7124-8BBCPZ-RL | 32-Lead LFCSP (5mm x 5mm x 0.95mm w/ EP) | ||
| AD7124-8BBCPZ-RL7 | 32-Lead LFCSP (5mm x 5mm x 0.95mm w/ EP) | ||
| AD7124-8BCPZ | 32-Lead LFCSP (5mm x 5mm x 0.75mm w/ EP) | ||
| AD7124-8BCPZ-RL | 32-Lead LFCSP (5mm x 5mm x 0.75mm w/ EP) | ||
| AD7124-8BCPZ-RL7 | 32-Lead LFCSP (5mm x 5mm x 0.75mm w/ EP) | ||
| AD7124-8WBBCPZ-RL7 | 32-Lead LFCSP (5mm x 5mm x 0.95mm w/ EP) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Feb 22, 2023 - 21_0248 AD7124-8/-4 B Grade Redesign - Metal Edit |
||
| AD7124-8BBCPZ | PRODUCTION | |
| AD7124-8BBCPZ-RL | PRODUCTION | |
| AD7124-8BBCPZ-RL7 | PRODUCTION | |
|
Nov 20, 2024 - 22_0096 AD7124-4/AD7124-8 Standard Grade Redesign - Metal Edit. Applies to LFCSP Packages Only |
||
| AD7124-8BCPZ | PRODUCTION | |
| AD7124-8BCPZ-RL | PRODUCTION | |
| AD7124-8BCPZ-RL7 | PRODUCTION | |
|
Jun 23, 2016 - 16_0118 AD7124-4 and AD7124-8 Metal Edit and Specification Changes |
||
| AD7124-8BCPZ | PRODUCTION | |
| AD7124-8BCPZ-RL | PRODUCTION | |
| AD7124-8BCPZ-RL7 | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Mbed Support 6
Device Drivers 2
Evaluation Software 1
Can't find the software or driver you need?
Hardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| isoPower 1 | ||
| ADUM5010 | PRODUCTION | 2.5kV rms Isolated DC/DC Converter |
| Series Voltage References 1 | ||
| ADR4525 | PRODUCTION | Ultra-Low-Noise, High-Accuracy 2.5V Voltage Reference |
| Standard Digital Isolators 1 | ||
| ADUM1441 | RECOMMENDED FOR NEW DESIGNS | Micropower Quad-Channel Digital Isolator, Default High (3/1 Channel Directionality) |
Tools & Simulations
Virtual Eval - BETA
Virtual Eval is a web application to assist designers in product evaluation of ADCs, DACs, and other ADI products. Using detailed models on Analog’s servers, Virtual Eval simulates crucial part performance characteristics within seconds. Configure operating conditions such as input tones and external jitter, as well as device features like gain or digital down-conversion. Performance characteristics include noise, distortion, and resolution, FFTs, timing diagrams, response plots, and more.
Open ToolDesign Tool 2
IBIS Model 1
Evaluation Kits
8-Channel, Low Noise, Low Power, 24-Bit, Sigma-Delta ADC with PGA and Reference PMOD Board
Resources
Software
AD7124-8 Evaluation Board
Resources
Software
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Videos
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