ZHCU389A December   2017  – April 2020

 

  1.   修订历史记录

1.2 Key System Specifications

Table 1 shows the key system specifications for the high-accuracy, 16-channel AIM reference design.

Table 1. Key System Specifications

SERIAL NUMBER PARAMETER DESCRIPTION COMMENT
1 ADC 16-bit SAR ADC with configurable input ranges SPI
2 Number of channels 16 channels with dual simultaneous sampling
3 Input range 10 V, 5 V, 2.5 V With programmable 20% overrange
4 Sampling rate 1-MHz Meets IEC 61850-9-2 sampling requirements for protection and measurement. Provides programmable OSR for performance improvement.
5 Input impedance Constant 1-MΩ input impedance front-end
6 Digital isolation Digital isolator with integrated power Reinforced
7 Six-channel digital isolator with external isolated power Reinforced, provides flexibility in digital isolator selection
8 internal filer Programmable filter of 15 kHz, 39 kHz or 376 kHz
9 AFE Potential divider interfaced to Precision amplifier and instrumentation amplifier With different gains to cover wide inputs
Current sensor interfaced to Precision amplifier and instrumentation amplifier With different gains to cover wide inputs
10 Host interface SPI Serial interface simplifies communication interface
11 Parallel Parallel interface reduces firmware complexity
12 Diagnostics Digital and analog power supply using auxiliary channels Displayed on GUI
13 LED indication for alarm, power, and activity (chip select) Visual indication
14 Power supply Split-rail supply with LDO Output programmable, low ripple
15 Isolated power supply using isolated DC/DC or transformer driver Efficiency > 60%
16 Temperature compensation Onboard analog temperature sensor for compensation measurement accuracy variation Accuracy < ± 0.2%
17 Analog input connectors Screw type connector