MMCCMB2107 Freescale, MMCCMB2107 Datasheet - Page 494

• Manufacturer Part Number: MMCCMB2107
• Manufacturer: Freescale

Specifications of MMCCMB2107

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Queued Analog-to-Digital Converter (QADC)
18.11.5 Accommodating Positive/Negative Stress Conditions
Technical Data
494
Positive or negative stress refers to conditions which exceed nominally
defined operating limits. Examples include applying a voltage exceeding
the normal limit on an input (for example, voltages outside of the
suggested supply/reference ranges) or causing currents into or out of
the pin which exceed normal limits. QADC specific considerations are
voltages greater than V
input which cause excessive currents into or out of the input. Refer to
Section 22. Electrical Specifications
magnitudes.
Either stress conditions can potentially disrupt conversion results on
neighboring inputs. Parasitic devices, associated with CMOS
processes, can cause an immediate disruptive influence on neighboring
pins. Common examples of parasitic devices are diodes to substrate and
bipolar devices with the base terminal tied to substrate (V
ground). Under stress conditions, current injected on an adjacent pin can
cause errors on the selected channel by developing a voltage drop
across the selected channel’s impedances.
Figure 18-51
input pin is subjected to negative stress conditions.
positive stress conditions can activate a similar PNP transistor.
Freescale Semiconductor, Inc.
For More Information On This Product,
Queued Analog-to-Digital Converter (QADC)
Figure 18-51. Input Pin Subjected to Negative Stress
Figure 18-52. Input Pin Subjected to Positive Stress
Go to: www.freescale.com
V
shows an active parasitic bipolar NPN transistor when an
In
V
In
V
+
V
Stress
Stress
+
DDA
, V
R
R
RH
10 K
Selected
Stress
R
R
Selected
10 K
Stress
,
or less than V
I
INJP
I
In
I
INJN
I
In
PARASITIC
AN
AN
for more information on exact
DEVICE
PARASITIC
AN
n+1
AN
n
DEVICE
n+1
n
PIN UNDER
ADJACENT
STRESS
PIN UNDER
ADJACENT
PIN
STRESS
SSA
PIN
applied to an analog
Figure 18-52
MMC2107 – Rev. 2.0
V
DDA
SSI
/V
MOTOROLA
SSA
shows