Analog Devices Inc. ADC sigma delta aislados ADE7912/ADE7913 con SPI
Los ADE7912/ADE7913 de Analog Devices son unos convertidores analógico-digital (ADC) totalmente aislados diseñados para diversas aplicaciones como contadores de derivación polifásicos, control de calidad de energía, inversores solares, control de procesos y dispositivos protectores. Los dispositivos incorporan las tecnologías iCoupler® y isoPower® patentadas de Analog Devices para implementar una transferencia de señal aislada y conversión de potencia CC a CC en una barrera de aislamiento de 5 kV. Esta integración permite el uso de elementos de detección de resistencias de derivación en lugar de transformadores de corriente (CT), con lo que se proporciona inmunidad ante interferencias del campo magnético y manipulaciones. El uso de resistores en lugar de CT reduce el coste y el tamaño del sistema.
The ADE7912 features two 24-bit ADCs, and the ADE7913 features three ADCs. The current ADC provides a 67dB signal-to-noise ratio over a 3kHz signal bandwidth, whereas the voltage ADCs provide a SNR of 72dB over the same bandwidth. One channel is dedicated to measuring the voltage across a shunt when the shunt is used for current sensing. Up to two additional channels are dedicated to measuring voltages, which are usually sensed using resistor dividers. One voltage channel can be used to measure the temperature of the die via an internal sensor.
The ADE7913 includes three channels: one current and two voltage channels. The ADE7912 has one voltage channel but is otherwise identical to the ADE7913.
Características
- Two (ADE7912) or three (ADE7913) 24-bit isolated, Σ-Δ analog-to-digital converters (simultaneously sampling ADCs)
- Integrated isoPower, isolated DC-to-DC converter
- On-chip temperature sensor mixed with second voltage channel
- 4-wire SPI serial interface
- Up to 4 ADE7912/ADE7913 devices clocked from a single crystal or an external clock
- Synchronization of multiple ADE7912/ADE7913 devices
- Safety and regulatory approvals (pending)
- UL recognition
- CSA Component Acceptance Notice #5A
- 400Vrms IEC 61010-1
- VDE certificate of conformity
- DIN VDE V 0884-10 (VDE V 0884-10):2006-12
Especificaciones
- Single 3.3V supply
- ±31.25mV peak input range for current channel
- ±500mV peak input range for voltage channels
- 20-lead, wide-body SOIC package with increased 8.3mm clearance and creepage
- 10ppm/°C typical Reference drift
- -40°C to +85°C operating temperature range
- 5000Vrms for 1 minute per UL 1577 Isolation rating
- 400Vrms IEC 61010-1
Aplicaciones
- Shunt-based polyphase meters
- Power quality monitoring
- Solar inverters
- Process monitoring
- Protective devices
- Isolated sensor interfaces
- Industrial PLCs
Vídeos
Typical Application Circuit
Publicado: 2014-04-04
| Actualizado: 2022-03-11