 AD converter type: AD7663（default 7663, also can use AD7665）
 Input Range: ±10V,±5V, ±2.5, 0～10V, 0～5V
 16-bit resolution
 Sampling Rate: 250KHz maximum (AD7665: 500KHz maximum)
 Analog Input Mode: 32-channel single end and 16-channel double end
 Analog Input Isolation Voltage: 2500Vrms（1min）
 Data Read Mode: non-empty, half-full inquiry mode
 Memory Depth: 8K word bytes FIFO memory
 Memory Signs: full, non-empty and half-full
 AD Mode: continuum sampling , grouping sampling
 Trigger Type: level trigger , edge trigger
 Trigger Direction: negative, positive, positive and negative trigger
 Trigger Source DTR Input Range: standard TTL level
 Programmable Gain: 1, 2, 4, 8 times (AD8251)or 1, 2, 5, 10 times (AD8250) or 1, 10, 100, 1000 times (AD8253)
 Operating Temperature Range:－40℃ ～ +85℃
 Storage Temperature Range: －40℃ ～ +120℃