mc9s12vr48 Freescale Semiconductor, Inc, mc9s12vr48 Datasheet - Page 526

• Manufacturer Part Number: mc9s12vr48
• Description: S12 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

ATD Electrical Specifications
C.2.1
PortAD output drivers switching can adversely affect the ATD accuracy whilst converting the analog
voltage on other PortAD pins because the output drivers are supplied from the VDDA/VSSA ATD supply
pins. Although internal design measures are implemented to minimize the affect of output driver noise, it
is recommended to configure PortAD pins as outputs only for low frequency, low load outputs. The impact
on ATD accuracy is load dependent and not specified. The values specified are valid under condition that
no PortAD output drivers switch during conversion.
C.2.2
Due to the input pin leakage current as specified in conjunction with the source resistance there will be a
voltage drop from the signal source to the ATD input. The maximum source resistance R
in an error (10-bit resolution) of less than 1/2 LSB (2.5 mV) at the maximum leakage current. If device or
operating conditions are less than worst case or leakage-induced error is acceptable, larger values of source
resistance of up to 10Kohm are allowed.
C.2.3
When sampling an additional internal capacitor is switched to the input. This can cause a voltage drop due
to charge sharing with the external and the pin capacitance. For a maximum sampling error of the input
voltage ≤ 1LSB (10-bit resilution), then the external filter capacitor, C
C.2.4
There are two cases to consider.
526
1. A current is injected into the channel being converted. The channel being stressed has conversion
2. Current is injected into pins in the neighborhood of the channel being converted. A portion of this
values of $3FF (in 10-bit mode) for analog inputs greater than V
V
current is picked up by the channel (coupling ratio K), This additional current impacts the accuracy
of the conversion depending on the source resistance.
The additional input voltage error on the converted channel can be calculated as:
with I
RL
Port AD Output Drivers Switching
Source Resistance
Source Capacitance
Current Injection
unless the current is higher than specified as disruptive condition.
INJ
being the sum of the currents injected into the two pins adjacent to the converted channel.
MC9S12VR Family Reference Manual,
Preliminary - Subject to Change Without Notice
V
ERR
= K * R
S
* I
Rev. 2.2
INJ
f
≥ 1024 * (C
RH
and $000 for values less than
INS
Freescale Semiconductor
–C
S
specifies results
INN
).