Electrical characteristics – Rainbow Electronics ADC08062 User Manual
Page 5
Electrical Characteristics
(Continued)
Note 1
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur DC and AC electrical specifications do not apply when operating
the device beyond its specified operating ratings Operating Ratings indicate conditions for which the device is functional but do not guarantee performance limits
For guaranteed specifications and test conditions see the Electrical Characteristics The guaranteed specifications apply only for the test conditions listed Some
performance characteristics may degrade when the device is not operated under the listed test conditions
Note 2
All voltages are measured with respect to the GND pin unless otherwise specified
Note 3
When the input voltage (V
IN
) at any pin exceeds the power supply voltage (V
IN
k
GND or V
IN
l
V
a
) the absolute value of the current at that pin should be
limited to 5 mA or less The 20 mA package input current specification limits the number of pins that can exceed the power supply boundaries with a 5 mA current
limit to four
Note 4
The power dissipation of this device under normal operation should never exceed 875 mW (Quiescent Power Dissipation
a
the loads on the digital
outputs) Caution should be taken not to exceed absolute maximum power rating when the device is operating in a severe fault condition (e g when any input or
output exceeds the power supply) The maximum power dissipation must be derated at elevated temperatures and is dictated by T
JMAX
(maximum junction
temperature) i
JA
(package junction to ambient thermal resistance) and T
A
(ambient temperature) The maximum allowable power dissipation at any temperature
is PD
max
e
(T
JMAX
b
T
A
) i
JA
or the number given in the Absolute Maximum Ratings whichever is lower The table below details T
JMAX
and i
JA
for the various
packages and versions of the ADC08061 2
Part Number
T
JMAX
i
JA
ADC08061 2BIN
105
51
ADC08061 2CIN
105
51
ADC08061 2BIWM
105
85
ADC08061 2CIWM
105
85
ADC08061 2CMJ
125
76
Note 5
See AN-450 ‘‘Surface Mounting Methods and Their Effect on Product Reliability’’ for other methods of soldering surface mount devices
Note 6
Human body model 100 pF discharged through a 1 5 kX resistor
Note 7
Typicals are at 25 C and represent most likely parametric norm
Note 8
Limits are guaranteed to National’s AOQL (Average Output Quality Level)
Note 9
Total unadjusted error includes offset full-scale and linearity errors
Note 10
Two on-chip diodes are tied to each analog input and are reversed biased during normal operation One is connected to V
a
and the other is connected to
GND They will become forward biased and conduct when an analog input voltage is equal to or greater than one diode drop above V
a
or below GND Therefore
caution should be exercised when testing with V
a
e
4 5V Analog inputs with magnitudes equal to 5V can cause an input diode to conduct especially at elevated
temperatures This can create conversion errors for analog signals near full-scale The specification allows 50 mV forward bias on either diode e g the output
code will be correct as long as the analog input signal does not exceed the supply voltage by more than 50 mV Exceeding this range on an unselected channel will
corrupt the reading of a selected channel An absolute analog input signal voltage range of 0V
s
V
IN
s
5V can be achieved by ensuring that the minimum supply
voltage applied to V
a
is 4 950V over temperature variations initial tolerance and loading
Note 11
Off-channel leakage current is measured after the on-channel selection
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