ADEMA124

RECOMMENDED FOR NEW DESIGNS

Simultaneously Sampling 4- and 7-Channel ΣΔ ADC with SPI

Data Sheet (Rev. 0) Product Selection Table

Part Models: 3
1ku List Price: Starting From $2.65

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Overview

4- or 7-channel high performance, simultaneous sampling Σ-Δ ADCs
- SNR up to 105dB
- Programmable sample rate of up to 64kSPS
- Wide input-voltage range: ±1.2VPK, 848mV_RMS full-scale
- High impedance, differential inputs
Internal voltage reference temperature coefficient: 5ppm/°C typical
Integrated digital integrator and high-pass filter for use with Rogowski coils
Fast start-up with first samples in 0.5ms after valid supply

Tamper detect mode, low power for battery back-up
4-wire SPI with bidirectional CRC and daisy-chain functionality
Simple synchronization of multiple ADC devices
Gain, phase, and offset compensation for each channel
Unique SPI readable part ID registers
Only 18mW power consumption with 7-channel ADC
Wide temperature range: −40°C to +125°C
Compact 32-lead, 5mm x 5mm LFCSP

The ADEMA124/ADEMA127 are 4- and 7-channel simultaneously sampling 24-bit sigma delta analog-to-digital converters (ADC), ideal for use in polyphase or split-phase energy metering applications. The ADEMA124/ADEMA127 are compatible with voltage dividers, shunts, and isolated current sensors such as current transformers and Rogowski coils.

The ADEMA124/ADEMA127 include independent hardware and DSP filters enabling gain, phase and offset compensation on each ADC channel. The ADEMA124/ADEMA127 also have bespoke compensation and DSP features, which include an integrator and second-order high-pass filter to allow streamlined Rogowski sensor implementations. DSP filter coefficients for typical use cases are automatically loaded and are accessible for customization of filter characteristics.

The sinc compensation, LPF, and DSP decimate-by-2 feature extend the usable analog bandwidth by up to 70% for a given output sample rate. The high bandwidth makes ADEMA124/ADEMA127 suitable for IEC 61000-4-30 Power Quality Class A and Class S meters. The ADEMA124/ADEMA127 can be used in systems compliant to active energy standards IEC 62053-21, IEC 62053-22, OIML R46ANSI, and C12.20 and reactive energy standards IEC 62053-23, IEC 62053-24, and EN 50470-3. The ADEMA124/ADEMA127 can be used in circuit breakers and protection relays, particularly with a Rogowski sensor due to a 0.5ms fast start-up time.

The ADEMA124/ADEMA127 have a flexible SPI interface for configuration and data retrieval. The daisy-chain SPI interface allows multiple compatible ADCs to be serviced simultaneously by a single SPI port, which saves many pins on the host microcontroller. Additionally, the SPI port is daisy-chain compatible with the 2- and 3-channel isolated ADC, ADE9112/ADE9113. To maintain integrity of ADC waveform data, independent cyclic redundancy checks (CRC) are available to detect errors in inbound and outbound SPI packets, and incidental changes of configuration registers.

APPLICATIONS

Polyphase energy meters
Split-phase energy meters
Branch circuit monitoring
Power distribution units
Power quality monitoring
Circuit breakers
Protection relays
Electric vehicle supply equipment

Part Models: 3
1ku List Price: Starting From $2.65

Documentation

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
ADEMA124ACPZ	LFCSP:LEADFRM CHIP SCALE	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
ADEMA124ACPZ-RL	LFCSP:LEADFRM CHIP SCALE	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
ADEMA124ACPZ-RL7	LFCSP:LEADFRM CHIP SCALE	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Software Resources

Device Drivers 1

ADEMA124/ADEMA127 ADC Service NEW

Can't find the software or driver you need?

Hardware Ecosystem

Parts	Product Life Cycle	Description
LDO Linear Regulators 1
ADP7105	RECOMMENDED FOR NEW DESIGNS	20 V, 500 mA, Low Noise LDO Regulator with Soft Start

Evaluation Kits

Evaluating the ADEMA124/ADEMA127 Simultaneously Sampling 4- and 7-Channel ΣΔ ADC with SPI

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Features and Benefits

Fully-featured evaluation board for the ADEMA124 and ADEMA127
3-phase 4-wire, 3-phase 3-wire, or 3-wire single-phase measurements
PC control in conjunction with the Analysis | Control | Evaluation (ACE) system demonstration platform
Up to 240Vrms nominal line neutral voltage measurement

Product Details

The EVAL-ADEMA127KTZ is a two board evaluation kit for the simultaneously sampling 4-channel ADEMA124 and 7-channel ADEMA127 ΣΔ ADC. The EVAL-ADEMA127KTZ evaluation board is a configured as a 3-phase meter. The kit includes current transformers (CTs) for A-, B-, and C-phase and neutral current measurement. The application MCU board includes the STM32H573. The kit can be interfaced with via GUI available in the ACE software environment. The ADC driver library for the ADEMA124/ADEMA127 available on GitHub can also be uploaded to the application MCU board.

Full specifications on the ADEMA124/ADEMA127 are available in the ADEMA124/ADEMA127 data sheet available from Analog Devices, Inc. and must be consulted with this user guide when using the EVAL-ADEMA127KTZ evaluation board.

For the current schematic, printed circuit board (PCB), and bill of material (BOM), refer to the EVAL-ADEMA127 product page.