ADC08034 National Semiconductor, ADC08034 Datasheet - Page 5

• Manufacturer Part Number: ADC08034
• Description: 8-Bit High-Speed Serial I/O A/D Converters with Multiplexer Options/ Voltage Reference/ and Track/Hold Function
• Manufacturer: National Semiconductor

Electrical Characteristics
Note 4: When the input voltage V
The 20 mA maximum package input current rating limits the number of pins that can safely exceed the power supplies with an input current of 5 mA to four pins.
Note 5: The maximum power dissipation must be derated at elevated temperatures and is dictated by T
allowable power dissipation at any temperature is P
suffixes CIN and CIWM T
140˚C/W, ADC08034 CIWM 140˚C/W, ADC08038CIWM suffixes 91˚C/W.
Note 6: Human body model, 100 pF capacitor discharged through a 1.5 k
Note 7: See AN450 “Surface Mounting Methods and Their Effect on Product Reliability” or Linear Data Book section “Surface Mount” for other methods of soldering
surface mount devices.
Note 8: Typicals are at T
Note 9: Guaranteed to National’s AOQL (Average Outgoing Quality Level).
Note 10: Total unadjusted error includes offset, full-scale, linearity, multiplexer.
Note 11: For V
analog input voltages one diode drop below ground or one diode drop greater than V
(e.g., 5V) can cause an input diode to conduct, especially at elevated temperatures, which will cause errors for analog inputs near full-scale. The spec allows 50 mV
forward bias of either diode; this means that as long as the analog V
ceeding this range on an unselected channel will corrupt the reading of a selected channel. Achievement of an absolute 0 V
fore require a minimum supply voltage of 4.950 V
Note 12: Channel leakage current is measured after a single-ended channel is selected and the clock is turned off. For off channel leakage current the following two
cases are considered: one, with the selected channel tied high (5 V
nels is measured; two, with the selected channel tied low and the off channels tied high, total current flow through the off channels is again measured. The two cases
considered for determining on channel leakage current are the same except total current flow through the selected channel is measured.
Note 13: A 40% to 60% duty cycle range insures proper operation at all clock frequencies. In the case that an available clock has a duty cycle outside of these limits
the minimum time the clock is high or low must be at least 450 ns. The maximum time the clock can be high or low is 100 µs.
Note 14: Since data, MSB first, is the output of the comparator used in the successive approximation loop, an additional delay is built in (see Block Diagram) to allow
for comparator response time.
Typical Performance Characteristics
Linearity Error vs
Reference Voltage
Power Supply Current vs
Temperature
IN(−)
V
IN(+)
JMAX
J
= 25˚C and represent the most likely parametric norm.
the digital code will be 0000 0000. Two on-chip diodes are tied to each analog input (see Block Diagram) which will forward-conduct for
= 125˚C. The typical thermal resistances (
IN
DS010555-32
DS010555-35
at any pin exceeds the power supplies (V
DC
D
= (T
over temperature variations, initial tolerance and loading.
(Continued)
Linearity Error vs
Temperature
Output Current vs
Temperature
JMAX
− T
A
DC
)/
IN
) and the remaining seven off channels tied low (0 V
JA
does not exceed the supply voltage by more than 50 mV, the output code will be correct. Ex-
or the number given in the Absolute Maximum Ratings, whichever is lower. For devices with
JA
) of these parts when board mounted follow: ADC08031CIN 120˚C/W, ADC08031CIWM
IN
resistor.
<
5
(AGND or DGND) or V
CC
supply. During testing at low V
DS010555-36
DS010555-33
JMAX
IN
>
,
V
CC
JA
Linearity Error vs
Clock Frequency
Power Supply Current
vs Clock Frequency
) the current at that pin should be limited to 5 mA.
and the ambient temperature, T
CC
levels (e.g., 4.5V), high level analog inputs
DC
DC
), total current flow through the off chan-
to 5 V
DC
input voltage range will there-
A
. The maximum
www.national.com
DS010555-37
DS010555-34