ADC-0803 Harris, ADC-0803 Datasheet - Page 5

• Manufacturer Part Number: ADC-0803
• Description: (ADC0802 - ADC0804) 8-Bit/ Microprocessor- Compatible/ A/D Converters
• Manufacturer: Harris

www.DataSheet4U.com
Electrical Specifications
NOTES:
Timing Waveforms
Logic “1” Output Voltage, V
Three-State Disabled Output
Leakage (All Data Buffers)
Output Short Circuit Current,
I
Output Short Circuit Current,
I
1. All voltages are measured with respect to GND, unless otherwise specified. The separate AGND point should always be wired to the
2. For V
3. With V+ = 6V, the digital logic interfaces are no longer TTL compatible.
4. With an asynchronous start pulse, up to 8 clock periods may be required before the internal clock phases are proper to start the conversion
5. The CS input is assumed to bracket the WR strobe input so that timing is dependent on the WR pulse width. An arbitrarily wide pulse
6. CLK IN (pin 4) is the input of a Schmitt trigger circuit and is therefore specified separately.
7. None of these A/Ds requires a zero-adjust. However, if an all zero code is desired for an analog input other than 0V, or if a narrow full scale span
SOURCE
SINK
DGND, being careful to avoid ground loops.
will forward conduct for analog input voltages one diode drop below ground or one diode drop greater than the V+ supply. Be careful,
during testing at low V+ levels (4.5V), as high level analog inputs (5V) can cause this input diode to conduct - especially at elevated tem-
peratures, and cause errors for analog inputs near full scale. As long as the analog V
50mV, the output code will be correct. To achieve an absolute 0V to 5V input voltage range will therefore require a minimum supply volt-
age of 4.950V over temperature variations, initial tolerance and loading.
process.
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).
exists (for example: 0.5V to 4V full scale) the V
IN(-)
PARAMETER
RD
CS
RD
CS
V
IN(+)
the digital output code will be 0000 0000. Two on-chip diodes are tied to each analog input (see Block Diagram) which
V+
FIGURE 1A. t
FIGURE 1C. t
V+
, I
OH
LO
V+
(Notes 1, 7) (Continued)
C
l
V
V
V
V
O
10K
L
OUT
OUT
OUT
OUT
C
= -360 A, V+ = 4.75V
L
FIGURE 1. THREE-STATE CIRCUITS AND WAVEFORMS
1H
0H
Short to Gnd T
= 0V
= 5V
Short to V+ T
10K
TEST CONDITIONS
DATA
OUTPUT
ADC0802, ADC0803, ADC0804
DATA
OUTPUT
IN(-)
input can be adjusted to achieve this. See the Zero Error description in this data sheet.
A
A
= 25
= 25
o
C
o
C
6-9
MIN
2.4
4.5
9.0
-3
-
OUTPUTS
OUTPUTS
IN
DATA
does not exceed the supply voltage by more than
DATA
FIGURE 1B. t
FIGURE 1D. t
RD
RD
TYP
16
2.4V
0.8V
6
-
-
-
V
GND
2.4V
0.8V
V+
V
OI
OH
1H
0H
t
r
t
r
= 20ns
, C
, C
= 20ns
t
t
r
10%
r
10%
L
L
50%
MAX
50%
90%
= 10pF
= 10pF
90%
3
-
-
-
-
10%
90%
t
0H
t
1H
UNITS
mA
mA
V
A
A