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Pin configuration
Applications
Data Acquisition Systems
Power Line Monitoring and Protection Systems
Multi-axis Positioning Systems
Multi-phase Motor Systems
Instrumentation and Control Systems
Appearance dimensions
Typical Connection Diagram
Application Case
**Application of the 8-Channel Simultaneous-Sampling ADC (CM2248) in Power Systems**
01 Introduction
CM2248 is a 16-bit, 8-channel simultaneous-sampling ADC introduced by SIMO Microelectronics. Each channel integrates analog input clamp protection, a second-order anti-aliasing filter, a track-and-hold amplifier, and a 16-bit SAR ADC, along with flexible on-chip digital filters.
CM2248 operates from a single 5 V supply and can handle true bipolar input signals of ±10 V or ±5 V. All channels support a throughput of up to 200 kSPS for sampling and data output. The analog input impedance is 1 MΩ, and the input clamp protection circuitry can withstand overvoltage levels up to ±16.5 V. CM2248 is pin-compatible with ADI’s AD7606 and TI’s ADS8588.
02 CM2248 Features
Bipolar analog input ranges: ±10 V, ±5 V
5 V analog supply, VDRIVE: 2.3 V to 5 V
8-channel simultaneous-sampling inputs
LQFP64 10 × 10 package
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Fully integrated data acquisition solution
Analog input clamp protection
Input buffer with 1 MΩ analog input impedance
Second-order anti-aliasing analog filter
On-chip precision reference voltage and buffer
16-bit, 200 kSPS ADC (all channels)
Oversampling capability via digital filters
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Flexible parallel/serial interfaces
SPI / QSPI / MICROWIRE / DSP compatible
Performance
92 dB SNR, −105 dB THD
±1 LSB INL, ±0.8 LSB DNL
Low power consumption: 150 mW in operation mode, 30 mW in standby mode
Analog input ESD rating up to 8 kV
All products pass stringent reliability testing
03 Solution Overview
A power system consists of a primary system (high voltage, including generators, power networks, and loads) and a secondary system (low voltage, including information systems and control mechanisms that ensure the safe, reliable, and economical operation of the primary system). To reduce total installed capacity and improve supply reliability and economy, interconnection of power systems has become a major trend. However, this also increases the vulnerability of the power grid, where local faults may threaten the entire system. As a result, power monitoring systems have become an indispensable part of ensuring reliable grid operation. CM2248 is mainly used in two key areas of power systems:
Power Monitoring Systems
Power monitoring systems can monitor the operating status of the power system in real time while recording operational data and events. The main parameters measured include:
Voltage: instantaneous voltage, voltage phasors (RMS value and phase), fundamental voltage phasors, harmonic voltage phasors
Current: instantaneous current, current phasors, fundamental and harmonic phasors
Frequency
Power: active power / reactive power, apparent power
Energy: active energy and reactive energy
Operating status of various components
CM2248 is a single-chip, 8-channel simultaneous-sampling analog front end that enables convenient measurement of real-time voltage and current and their phase differences. This allows easy calculation of power factor, apparent power, and energy. Its high ESD protection level and rigorous mass-production testing make it highly suitable for power system applications.
Grid-Connected Inverters for Renewable Energy
To ensure reliable grid operation, renewable energy sources such as wind and solar power must meet stringent requirements for parameters such as frequency and power factor when connected to the grid. Therefore, DC–AC inversion is required, and accurate monitoring of inverter voltage and current demands a high-precision simultaneous-sampling system. CM2248 effectively meets these requirements.
04 Product Advantages
In summary, CM2248 offers high integration, a high signal-to-noise ratio of 92 dB, and high reliability, making it well suited for high-precision sampling of various signals in power system applications. In terms of performance, CM2248 is comparable to ADI’s AD7606 and TI’s ADS8588.
