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ADC0838A датащи(PDF) 8 Page - Texas Instruments

номер детали ADC0838A
подробное описание детали  A/D PERIPHERALS WITH SERIAL CONTROL
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производитель  TI [Texas Instruments]
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ADC0838A датащи(HTML) 8 Page - Texas Instruments

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Standby input current (see Note 4)
µA
II(stdby)
ADC0834A, ADC0838A, ADC0834B, ADC0838B
A/D PERIPHERALS WITH SERIAL CONTROL
SLAS007 – AUGUST 1985 – REVISED OCTOBER 1986
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
8
electrical
characteristics
over
recommended
range
of
operating
free-air
temperature,
VCC = V + = 5 V, fclock = 250 kHz (unless otherwise noted) (continued)
analog and converter section
PARAMETER
TEST CONDITIONS†
MIN
TYP‡
MAX
UNIT
– 0.05
VICR
Common-mode input voltage range
See Note 3
to
V
VCC+ 0.05
On-channel
VI = 5 V
1
Off-channel
VI = 0
–1
On-channel
VI = 0
–1
Off–channel
VI = 5 V
1
ri(REF)
Input resistance to reference ladder
1.3
2.4
5.9
k
total device
PARAMETER
TEST CONDITIONS†
MIN
TYP‡
MAX
UNIT
VZ
Internal zener diode breakdown voltage
II = 15 mA at V+ pin, See Note 2
6.3
7
8.5
V
ICC
Supply current
1
2.5
mA
† All parameters are measured under open-loop conditions with zero common-mode input voltage.
‡ All typical values are at VCC = 5 V, V+ = 5 V, TA = 25°C.
NOTES:
4. Internal zener diodes are connected from the VCC input to ground and from the V+ input to ground. The breakdown voltage of each
zener diode is approximately 7 V. One zener diode can be used as a shunt regulator and connects to VCC through a regular diode.
When the voltage regulator powers the converter, this zener and regular diode combination ensures that the VCC input (6.4 V) is less
than the zener breakdown voltage. A series resistor is recommended to limit current into the V+ input.
5. If channel IN– is more positive than channel IN+, the digital output code will be 0000 0000. Connected to each analog input are two
on-chip diodes that conduct forward current for analog input voltages one diode drop above VCC .Care must be taken during testing
at low VCC levels (4.5 V) because high-level analog input voltage (5 V) can, especially at high temperatures, cause this input diode
to conduct and cause errors for analog input s that are near full-scale. As long as the analog voltage does not exceed the supply
voltage by more than 50 mV, the output code will be correct. To achieve an absolute 0 V to 5 V input voltage range requires a minimum
VCC of 4.950 V for all variations of temperature and load.
6. Standby input currents are currents going into or out of the on or off channels when the A/D converter is not performing conversion
and the clock is in a high or low steady-state condition.


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