Elmo DBP SERIES manual Analog Input, Analog input specification

12

3.2 Analog input specification

Maximum input voltage:

-When R1 (470ohm) is inserted, the absolute value of the input voltage should be less than 5V.

-When the absolute value is higher than 5V, R1(Kohm) = 2Vi-10 should be inserted. The μP reads always +5V.

Resolution of the digital conversion: 11 bit full scale.

Typical offset: 5 bits

								470K
								4700PF		VREF
						470k	9	8		300	U1\10
							10
								U8C
										4700PF	4700PF
						DIGITAL GND
						470k		1000PF
										VREF
			*R1					20K
ANALOG	18a
		2		470k	6		20K
			1			7		13		300	U1\11
INPUT					5				14
						U8B		12
			10K						U8D
										4700PF	4700PF
								DIGITAL GND
			DIGITAL GND		DIGITAL GND
										DIGITAL GND
					ANALOG INPUT

DBP - Rev 6/93