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ADC0817 Fiches technique(PDF) 4 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No de pièce ADC0817
Description  8-Bit uP Compatible A/D Converters with 16-Channel Multiplexer
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Fabricant  NSC [National Semiconductor (TI)]
Site Internet  http://www.national.com
Logo NSC - National Semiconductor (TI)

ADC0817 Fiches technique(HTML) 4 Page - National Semiconductor (TI)

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Electrical Characteristics (Continued)
Digital Levels and DC Specifications: ADC0816CCN, ADC0817CCN — 4.75V
≤V
CC≤5.25V, −40˚C≤TA≤+85˚C unless other-
wise noted.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
CONTROL INPUTS
V
IN(1)
Logical “1” Input Voltage
V
CC−1.5
V
V
IN(0)
Logical “0” Input Voltage
1.5
V
I
IN(1)
Logical “1” Input Current
V
IN=15V
1.0
µA
(The Control Inputs)
I
IN(0)
Logical “0” Input Current
V
IN=0
−1.0
µA
(The Control Inputs)
I
CC
Supply Current
f
CLK=640 kHz
0.3
3.0
mA
DATA OUTPUTS AND EOC (INTERRUPT)
V
OUT(1)
Logical “1” Output Voltage
I
O=−360 µA, TA=85˚C
V
CC−0.4
V
I
O=−300 µA, TA=125˚C
V
OUT(0)
Logical “0” Output Voltage
I
O=1.6 mA
0.45
V
V
OUT(0)
Logical “0” Output Voltage EOC
I
O=1.2 mA
0.45
V
I
OUT
TRI-STATE Output Current
V
O=VCC
3.0
µA
V
O=0
−3.0
µA
Electrical Characteristics
Timing Specifications: V
CC=VREF(+)=5V, VREF(−)=GND, tr=tf=20 ns and TA=25˚C unless otherwise noted.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
t
WS
Minimum Start Pulse Width
(
Figure 5) (Note 7)
100
200
ns
t
WALE
Minimum ALE Pulse Width
(
Figure 5)
100
200
ns
t
s
Minimum Address Set-Up Time
(
Figure 5)25
50
ns
T
H
Minimum Address Hold Time
(
Figure 5)25
50
ns
t
D
Analog MUX Delay Time
R
S=OΩ (Figure 5)
1
2.5
µs
from ALE
t
H1,tH0
OE Control to Q Logic State
C
L=50 pF, RL=10k (Figure 8)
125
250
ns
t
1H, t0H
OE Control to Hi-Z
C
L=10 pF, RL=10k (Figure 8)
125
250
ns
t
C
Conversion Time
f
c=640 kHz, (Figure 5) (Note 8)
90
100
116
µs
f
c
Clock Frequency
10
640
1280
kHz
t
EOC
EOC Delay Time
(
Figure 5)
0
8+2µs
Clock
Periods
C
IN
Input Capacitance
At Control Inputs
10
15
pF
C
OUT
TRI-STATE Output
At TRI-STATE Outputs (Note 8)
10
15
pF
Capacitance
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 conditions.
Note 2: All voltages are measured with respect to GND, unless otherwise specified.
Note 3: A zener diode exists, internally, from VCC to GND and has a typical breakdown voltage of 7 VDC.
Note 4: Two on-chip diodes are tied to each analog input which will forward conduct for analog input voltages one diode drop below ground or one diode drop
greater than the VCC supply. The spec allows 100 mV forward bias of either diode. This means that as long as the analog VIN does not exceed the supply voltage
by more than 100 mV, the output code will be correct. To achieve an absolute 0 VDC to5VDC input voltage range will therefore require a minimum supply voltage
of 4.900 VDC over temperature variations, initial tolerance and loading.
Note 5: Total unadjusted error includes offset, full-scale, and linearity errors. See
Figure 3. None of these A/Ds requires a zero or full-scale adjust. However, if an
all zero code is desired for an analog input other than 0.0V, or if a narrow full-scale span exists (for example: 0.5V to 4.5V full-scale) the reference voltages can be
adjusted to achieve this. See
Figure 13.
Note 6: Comparator input current is a bias current into or out of the chopper stabilized comparator. The bias current varies directly with clock frequency and has
little temperature dependence (
Figure 6). See paragraph 4.0.
Note 7: If start pulse is asynchronous with converter clock or if fc > 640 kHz, the minimum start pulse width is 8 clock periods plus 2 µs. For synchronous operation
at fc ≤ 640 kHz take start high within 100 ns of clock going low.
Note 8: The outputs of the data register are updated one clock cycle before the rising edge of EOC.
Note 9: Human body model, 100 pF discharged through a 1.5 k
Ω resistor.
www.national.com
4


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