Baldor MN1274 06/2001 installation manual Analog Inputs, Differential, Pins Name, ADC.0 ADC.1

3.2.3Analog Inputs, Differential - X5

		Location	Connector X5
		Pins	8 (+) and 21 (-)	9 (+) and 22 (-)
		Name	AIN0	AIN1
		Mint keyword	ADC.0	ADC.1
		Description	Two independent differential inputs.
			Common mode voltage range: ±10VDC.
			Resolution: 12-bit with sign.
			Common mode rejection: 40dB
			Input impedance: >22kΩ
			Sampling interval: 0.5ms - 20ms (depends upon servo
1	14		loop frequency).
			Accuracy: better than 1%

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Typical use for these may be analog sensor inputs or to provide a low cost joy-stick interface.

The guaranteed DC accuracy of the inputs is 2%. Each input is buffered individually, before being fed into separate channels of the ADC, a Maxim MAX197. There is some input protection should the input voltage exceed the maximum rating shown above, although this is for protection against transitional over-voltage; long term over-voltages will cause permanent damage.

Each analog input signal should be connected to the system using a screened/shielded twisted pair cable, and the cable shield should be connected to the chassis at one end. Due to the differential characteristics of these inputs, they can provide better rejection of common mode noise provided normal good engineering practices are adhered to. No other connection should be made to the cable shield.

	X5
Input +	8
Input -	21
GND	20

		Input +
AIN0	(ADC.0)	Input -
		GND

X5

9

22

20

AIN1 (ADC.1)

Figure 12 - AIN0 and AIN1 analog inputs

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