
MC68F375
ELECTRICAL CHARACTERISTICS
MOTOROLA
REFERENCE MANUAL
Rev. 25 June 03
E-24
E.8 QADC64 and AMUX Characteristics
Table E-10 QADC64 Maximum Ratings
Num
Parameter
Symbol
Min
Max
Unit
1
Analog Supply, with reference to V
SSA
V
DDA
– 0.3
6.0
V
2
Digital Supply, with reference to V
SS
V
DDL
– 0.3
4.0
V
3
Reference Supply, with reference to V
RL
V
RH
– 0.3
6.0
V
4
V
SS
Differential Voltage
V
SS
– V
SSA
– 0.1
0.1
V
5
V
DD
Differential Voltage
V
DDL
– V
DDA
– 6.0
4.0
V
6
V
REF
Differential Voltage
V
RH
– V
RL
– 0.3
6.0
V
7
V
RH
to V
DDA
Differential Voltage
V
RH
– V
DDA
– 6.0
6.0
V
8
V
RL
to V
SSA
Differential Voltage
V
RL
– V
SSA
– 0.3
0.3
V
9
Disruptive Input Current1, 2, 3, 4, 5, 6, 7
V
NEGCLAMP
= -0.3
V
POSCLAMP
= TBD (8 – 12 V)
NOTES:
1. Below disruptive current conditions, the channel being stressed has conversion values of $3FF for analog inputs greater than
VRH and $000 for values less than VRL. This assumes that VRH ≤ VDDA and VRL ≥ VSSA due to the presence of the sample
amplifier. Other channels are not affected by non-disruptive conditions.
2. Input signals with large slew rates or high frequency noise components cannot be converted accurately. These signals also
affect the conversion accuracy of other channels.
3. Exceeding limit may cause conversion error on stressed channels and on unstressed channels. Transitions within the limit do
not affect device reliability or cause permanent damage.
4. Input must be current limited to the value specified. To determine the value of the required current-limiting resistor, calculate
resistance values using positive and negative clamp values, then use the larger of the calculated values.
5. This parameter is periodically sampled rather 100% tested.
6. Condition applies to one pin at a time.
7. Determination of actual maximum disruptive input current, which can affect operation, is related to external system component
values.
I
NA
– 500
500
A
10
Positive Overvoltage Current Coupling Ratio
1,
5, 6, 8
PQA
PQB
8. Current coupling is the ratio of the current induced from overvoltage (positive or negative, through an external series coupling
resistor), divided by the current induced on adjacent pins. A voltage drop may occur across the external source impedances
of the adjacent pins, impacting conversions on these adjacent pins.
K
P
2000
—
11
Negative Overvoltage Current Coupling Rati
o1, 5, 6,
8PQA
PQB
K
N
125
500
—
12
Maximum Input Current
3, 4,
6V
NEGCLAMP
= -0.3 V
V
POSCLAMP
= TBD (8 – 12 V)
I
MA
– 25
25
mA
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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