Transmission/Distribution

The AD7779 is an 8-channel, simultaneous sampling ADC. There are eight full Σ-Δ ADCs on chip. The AD7779 provides an ultralow input current to allow direct sensor connection. Each input channel has a programmable gain stage allowing gains of 1, 2, 4, and 8 to map lower amplitude sensor outputs into the full-scale ADC input range, maximizing the dynamic range of the signal chain. The AD7779 accepts V_REF from 1 V up to 3.6 V. The analog inputs accept unipolar (0 V to V_REF/GAIN) or true bipolar (±V_REF/GAIN/2 V) analog input signals with 3.3 V or ±1.65 V analog supply voltages. The analog inputs can be configured to accept true differential, pseudo differential, or singleended signals to match different sensor output configurations.

Each channel contains an ADC modulator and a sinc3, low latency digital filter. An SRC is provided to allow fine resolution control over the AD7779 ODR. This control can be used in applications where the ODR resolution is required to maintain coherency with 0.01 Hz changes in the line frequency. The SRC is programmable through the serial port interface (SPI). The AD7779 implements two different interfaces: a data output interface and SPI control interface. The ADC data output interface is dedicated to transmitting the ADC conversion results from the AD7779 to the processor. The SPI interface is used to write to and read from the AD7779 configuration registers and for the control and reading of data from the SAR ADC. The SPI interface can also be configured to output the Σ-Δ conversion data.

The AD7779 includes a 12-bit SAR ADC. This ADC can be used for AD7779 diagnostics without having to decommission one of the Σ-Δ ADC channels dedicated to system measurement functions. With the use of an external multiplexer, which can be controlled through the three general-purpose inputs/outputs pins (GPIOs), and signal conditioning, the SAR ADC can be used to validate the Σ-Δ ADC measurements in applications where functional safety is required. In addition, the AD7779 SAR ADC includes an internal multiplexer to sense internal nodes.

The AD7779 contains a 2.5 V reference and reference buffer. The reference has a typical temperature coefficient of 10 ppm/°C. The AD7779 offers two modes of operation: high resolution mode and low power mode. High resolution mode provides a higher dynamic range while consuming 10.75 mW per channel; low power mode consumes just 3.37 mW per channel at a reduced dynamic range specification.

The specified operating temperature range is −40°C to +105°C, although the device is operational up to +125°C.

APPLICATIONS

• Circuit breakers
• General-purpose data acquisition
• Electroencephalography (EEG)
• Industrial process control

The ADE1201¹ is a single channel, configurable, isolated digital input monitoring solution for energy transmission and distribution applications. The ADE1201 is configured through the serial port interface (SPI) to perform an isolated measurement of the digital input that is also called binary input or contact input. The ADE1201 digital output signal on the DOUT1 pin reflects the state of the input signal after user configurable signal conditioning. The SPI protocol supports addressing to allow up to eight devices sharing one 4-wire SPI port.

The ADE1201 application circuit accepts a wide range of input voltages from ±10 V dc to ±300 V dc, or 8 V rms to 240 V rms. The programmable wetting current and robust application circuit enable the device to meet stringent, system level electromagnetic capability (EMC) requirements.

The ADE1201 includes an isoPower^® integrated, isolated dc-to-dc converter that eliminates the need for an external isolated power supply. The iCoupler^® chip scale transformer technology is used to isolate the logic signals between the high voltage, isolated side and the low voltage, nonisolated side of the digital input monitor. This technology creates a small form factor design that includes data and power isolation.

An integrated successive approximation register (SAR) analog-to-digital converter (ADC) and a programmable gain amplifier (PGA) from 1× to 10× measure the analog inputs. The ADC waveforms are available through the SPI port to allow system level diagnostics.

Product Highlights

1. Single channel, configurable, isolated digital input.
2. Single hardware design supports 24 V to 300 V systems.
3. Robust architecture.
4. Enables system level diagnostics.

Applications

• Energy transmission and distribution
  
  • Multifunction relay protection
  • Substation battery monitoring
  • Bay or substation interlocking
  • Merge unit
  • Circuit breaker status indication
  • Remote terminal unit
• Building automation

¹ Protected by U.S. Patent Number 2017/0250043. Other patents pending.

The AD7616 is a 16-bit, DAS that supports dual simultaneous sampling of 16 channels. The AD7616 operates from a single 5 V supply and can accommodate ±10 V, ±5 V, and ±2.5 V true bipolar input signals while sampling at throughput rates up to 1 MSPS per channel pair with 90.5 dB SNR. Higher SNR performance can be achieved with the on-chip oversampling mode (92 dB for an oversampling ratio (OSR) of 2).

The input clamp protection circuitry can tolerate voltages up to ±21 V. The AD7616 has 1 MÙ analog input impedance, regardless of sampling frequency. The single-supply operation, on-chip filtering, and high input impedance eliminate the need for driver op amps and external bipolar supplies.

The device contains analog input clamp protection, a dual, 16-bit charge redistribution SAR analog-to-digital converter (ADC), a flexible digital filter, a 2.5 V reference and reference buffer, and high speed serial and parallel interfaces.

The AD7616 is serial peripheral interface (SPI)/QSPI™/DSP/ MICROWIRE compatible

Applications

• Power line monitoring
• Protective relays
• Multiphase motor control
• Instrumentation and control systems
• Data acquisition systems (DASs)

The ADP2450 integrates one boost shunt controller with power detection, one high efficiency buck regulator, four low offset, low power consumption programmable gain amplifiers (PGAs), one low offset operation amplifier, a fast analog trip circuit, and an actuator driver. The ADP2450 is targeted for low voltage circuit breakers, such as the molded case circuit breaker (MCCB), and current transformer (CT) powered supply applications.

The boost output voltage can be up to 36 V and integrates a power detection circuit that prevents the circuit from power hiccups. The power detection threshold is programmable with resistors.

The buck regulator operates over a wide input voltage range of 4.5 V to 36 V, and the output voltage can be adjusted down to 0.6 V. The buck regulator provides output currents of up to 500 mA. The buck regulator works in pulse-width modulation (PWM) mode with a fixed 1.2 MHz switching frequency, providing low output ripple voltage to the system.

The output voltage of the buck regulator is monitored by the supervisory circuit. When the output voltage is below the monitoring threshold, 88% of V_FB2 (FB2 regulation voltage), the reset signal is pulled low and can be used to reset the microprocessor. The monitoring supervisory circuit makes the system more reliable.

The ADP2450 integrates four low offset, low power consumption amplifiers. With the programmable gain features, the ADP2450 provides accuracy measurement over a wide current input range based on the CT turn ratio.

A low offset operation amplifier is integrated in the ADP2450 for leakage current detection.

The ADP2450 also integrates an analog trip circuit, which provides fast trip response and enhances system reliability.

Additional protection includes buck overcurrent protection (OCP) and system thermal shutdown (TSD).

The ADP2450 operates over the −40°C to +125°C junction temperature range and is available either in a 32-lead LFCSP or a 48-lead LQFP packages.

Applications

• Low voltage circuit breaker
• CT powered supply

The ADE9000 is a highly accurate, fully integrated, multiphase energy and power quality monitoring device. Superior analog performance and a digital signal processing (DSP) core enable accurate energy monitoring over a wide dynamic range. An integrated high end reference ensures low drift over temperature with a combined drift of less than ±25 ppm/°C maximum for the entire channel including a programmable gain amplifier (PGA) and an analog-to-digital converter (ADC).

The ADE9000 offers complete power monitoring capability by providing total as well as fundamental measurements on rms, active, reactive, and apparent powers and energies. Advanced features such as dip and swell monitoring, frequency, phase angle, voltage total harmonic distortion (VTHD), current total harmonic distortion (ITHD), and power factor measurements enable implementation of power quality measurements. The ½ cycle rms and 10 cycle rms/12 cycle rms, calculated according to IEC 61000-4-30 Class S, provide instantaneous rms measurements for real-time monitoring.

The ADE9000 offers an integrated flexible waveform buffer that stores samples at a fixed data rate of 32 kSPS or 8 kSPS, or a sampling rate that varies based on line frequency to ensure 128 points per line cycle. Resampling simplifies fast Fourier transform (FFT) calculation of at least 50 harmonics in an external processor.

The ADE9000 simplifies the implementation of energy and power quality monitoring systems by providing tight integration of acquisition and calculation engines. The integrated ADCs and DSP engine calculate various parameters and provide data through user accessible registers or indicate events through interrupt pins. With seven dedicated ADC channels, the ADE9000 can be used on a 3-phase system or up to three single-phase systems. It supports current transformers (CTs) or Rogowski coils for current measurements. A digital integrator eliminates a discrete integrator required for Rogowski coils.

The ADE9000 absorbs most complexity in calculations for a power monitoring system. With a simple host microcontroller, the ADE9000 enables the design of standalone monitoring or protection systems, or low cost nodes uploading data into the cloud.

Note that throughout this data sheet, multifunction pins, such as CF4/EVENT/DREADY, are referred to either by the entire pin name or by a single function of the pin, for example, EVENT, when only that function is relevant.

Applications

• Energy and power monitoring
• Power quality monitoring
• Protective devices
• Machine health
• Smart power distribution units
• Polyphase energy meters

The ADuM141E¹ is a quad-channel digital isolator based on Analog Devices, Inc., iCoupler^® technology. Combining high speed, complementary metal-oxide semiconductor (CMOS) and monolithic air core transformer technology, these isolation components provide outstanding performance characteristics superior to alternatives such as optocoupler devices and other integrated couplers. The maximum propagation delay is 13 ns with a pulse width distortion of less than 3 ns at 5 V operation. Channel matching is tight at 3.0 ns maximum.

The ADuM141E data channels are independent and are available in a variety of configurations with a withstand voltage rating of 3.0 kV rms or 3.75 kV rms (see the Ordering
Guide). The devices operate with the supply voltage on either side ranging from 1.8 V to 5 V, providing compatibility with lower voltage systems as well as enabling voltage translation functionality across the isolation barrier.

Unlike other optocoupler alternatives, dc correctness is ensured in the absence of input logic transitions. Two different fail-safe options are available, by which the outputs transition to a predetermined state when the input power supply is not applied or the inputs are disabled. The ADuM140E1/ADuM141E1/ADuM142E1 is pin-compatible with the ADuM1400/ADuM1401/ADuM1402.

Applications

• General-purpose multichannel isolation
• Serial peripheral interface (SPI)/data converter isolation
• Industrial field bus isolation

¹ Protected by U.S. Patents 5,952,849; 6,873,065; 6,903,578; and 7,075,329. Other patents are pending.

The circuit in Figure 1 is a completely isolated current sensor with an isolated power source. The circuit is highly robust and can be mounted close to the sense resistor for accurate measurements and minimum noise pickup. The output is a single 16 MHz bit stream from a sigma-delta modulator that is processed by a DSP using a sinc³ digital filter.

The circuit is ideal for monitoring the ac current in solar photovoltaic (PV) converters where the peak ac voltage can be several hundred volts, and the current can vary between a few mA and 25 A.