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ADC0801 Datasheet - Page 3

Download or read online National Semiconductor ADC0801 8-Bit Microprocessor Compatible A/D Converters pdf datasheet.
Also see for ADC0801: Datasheet #2 (41 pages)



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AC Electrical Characteristics

The following specifications apply for V
e
CC
Symbol
Parameter
CONTROL INPUTS Note CLK IN (Pin 4) is the input of a Schmitt trigger circuit and is therefore specified separately
V
(0)
Logical ‘‘0’’ Input Voltage
IN
(Except Pin 4 CLK IN)
I
(1)
Logical ‘‘1’’ Input Current
IN
(All Inputs)
I
(0)
Logical ‘‘0’’ Input Current
IN
(All Inputs)
CLOCK IN AND CLOCK R
V
CLK IN (Pin 4) Positive Going
a
T
Threshold Voltage
V
CLK IN (Pin 4) Negative
b
T
Going Threshold Voltage
V
CLK IN (Pin 4) Hysteresis
H
(V
)
(V
)
a
b
b
T
T
V
(0)
Logical ‘‘0’’ CLK R Output
OUT
Voltage
V
(1)
Logical ‘‘1’’ CLK R Output
OUT
Voltage
DATA OUTPUTS AND INTR
V
(0)
Logical ‘‘0’’ Output Voltage
OUT
Data Outputs
INTR Output
V
(1)
Logical ‘‘1’’ Output Voltage
OUT
V
(1)
Logical ‘‘1’’ Output Voltage
OUT
I
TRI-STATE Disabled Output
OUT
Leakage (All Data Buffers)
I
SOURCE
I
SINK
POWER SUPPLY
I
Supply Current (Includes
CC
Ladder Current)
ADC0801 02 03 04LCJ 05
ADC0804LCN LCV LCWM
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 The separate A Gnd point should always be wired to the D Gnd
Note 3 A zener diode exists internally from V
to Gnd and has a typical breakdown voltage of 7 V
CC
Note 4 For V
(
)
V
(
) the digital output code will be 0000 0000 Two on-chip diodes are tied to each analog input (see block diagram) which will forward
b
t
a
IN
IN
conduct for analog input voltages one diode drop below ground or one diode drop greater than the V
as high level analog inputs (5V) can cause this input diode to conduct–especially at elevated temperatures and 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
code will be correct To achieve an absolute 0 V
to 5 V
DC
variations initial tolerance and loading
Note 5 Accuracy is guaranteed at f
640 kHz At higher clock frequencies accuracy can degrade For lower clock frequencies the duty cycle limits can be
e
CLK
extended so long as the minimum clock high time interval or minimum clock low time interval is no less than 275 ns
Note 6 With an asynchronous start pulse up to 8 clock periods may be required before the internal clock phases are proper to start the conversion process The
start request is internally latched see Figure 2 and section 2 0
Note 7 The CS input is assumed to bracket the WR strobe input and therefore timing is dependent on the WR pulse width An arbitrarily wide pulse width will hold
the converter in a reset mode and the start of conversion is initiated by the low to high transition of the WR pulse (see timing diagrams)
Note 8 None of these A Ds requires a zero adjust (see section 2 5 1) To obtain zero code at other analog input voltages see section 2 5 and Figure 5
Note 9 The V
2 pin is the center point of a two-resistor divider connected from V
REF
ADC0805 and in the ADC0804LCJ each resistor is typically 16 k
Note 10 Human body model 100 pF discharged through a 1 5 k
(Continued)
5V
and T
T
T
unless otherwise specified
MIN s
A s
DC
MAX
Conditions
Min
V
4 75 V
e
CC
DC
V
5 V
e
IN
DC
V
0 V
1
e
b
IN
DC
2 7
1 5
0 6
I
360 A
e
O
V
4 75 V
e
CC
DC
I
360 A
2 4
eb
O
V
4 75 V
e
CC
DC
I
1 6 mA V
4 75 V
e
e
OUT
CC
DC
I
1 0 mA V
4 75 V
e
e
OUT
CC
DC
I
360 A V
4 75 V
2 4
eb
e
O
CC
DC
I
10 A V
4 75 V
4 5
eb
e
O
CC
DC
V
0 V
3
e
b
OUT
DC
V
5 V
e
OUT
DC
V
Short to Gnd T
25 C
4 5
e
OUT
A
V
Short to V
T
25 C
9 0
e
OUT
CC
A
f
640 kHz
e
CLK
V
2
NC T
25 C
e
e
REF
A
and CS
5V
e
DC
supply Be careful during testing at low V
CC
does not exceed the supply voltage by more than 50 mV the output
IN
input voltage range will therefore require a minimum supply voltage of 4 950 V
DC
to ground In all versions of the ADC0801 ADC0802 ADC0803 and
CC
In all versions of the ADC0804 except the ADC0804LCJ each resistor is typically 2 2 k
resistor
3
Typ
Max
Units
0 8
V
DC
0 005
1
A
DC
0 005
A
b
DC
3 1
3 5
V
DC
1 8
2 1
V
DC
1 3
2 0
V
DC
0 4
V
DC
V
DC
0 4
V
DC
0 4
V
DC
V
DC
V
DC
A
DC
3
A
DC
6
mA
DC
16
mA
DC
1 1
1 8
mA
1 9
2 5
mA
levels (4 5V)
CC
over temperature
DC

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