DEMO56F8014-EE Freescale Semiconductor, DEMO56F8014-EE Datasheet - Page 113

• Manufacturer Part Number: DEMO56F8014-EE
• Description: BOARD DEMO FOR 56F8014
• Manufacturer: Freescale Semiconductor
• Type: MCUr

Specifications of DEMO56F8014-EE

• Contents: *
• Processor To Be Evaluated: MC56F8014
• Data Bus Width: 16 bit
• Interface Type: RS-232
• For Use With/related Products: 56F8014
• For Use With: APMOTOR56F8000E - KIT DEMO MOTOR CTRL SYSTEM
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

10.15 Equivalent Circuit for ADC Inputs
Figure 10-17
at the same time that S3 is closed/open. When S1/S2 are closed & S3 is open, one input of the sample and
hold circuit moves to (V
switches are flipped, the charge on C1 and C2 are averaged via S3, with the result that a single-ended
analog input is switched to a differential voltage centered about (V
on every cycle of the ADC clock (open one-half ADC clock, closed one-half ADC clock). Note that there
are additional capacitances associated with the analog input pad, routing, etc., but these do not filter into
the S/H output voltage, as S1 provides isolation during the charge-sharing phase.
One aspect of this circuit is that there is an on-going input current, which is a function of the analog input
voltage, V
Freescale Semiconductor
5. LSB = Least Significant Bit = 0.806mV
6. Pin groups are detailed following
7. The current that can be injected or sourced from an unselected ADC signal input without impacting the performance of the
ADC.
REF
illustrates the ADC input circuit during sample and hold. S1 and S2 are always open/closed
and the ADC clock frequency.
REFH
-V
Table
REFL
10-1.
)/2, while the other charges to the analog input voltage. When the
56F8014 Technical Data, Rev. 11
REFH
-V
REFL
)/2. The switches switch
Equivalent Circuit for ADC Inputs
113