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ADC10062 Fiches technique(PDF) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No de pièce ADC10062
Description  10-Bit 600 ns A/D Converter with Input Multiplexer and Sample/Hold
Download  14 Pages
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Fabricant  NSC [National Semiconductor (TI)]
Site Internet  http://www.national.com
Logo NSC - National Semiconductor (TI)

ADC10062 Fiches technique(HTML) 3 Page - National Semiconductor (TI)

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Pin Descriptions
DV
CC,AVCC
These are the digital and analog positive sup-
ply voltage inputs. They should always be
connected to the same voltage source, but
are brought out separately to allow for sepa-
rate bypass capacitors. Each supply pin
should be bypassed with a 0.1 µF ceramic
capacitor in parallel with a 10 µF tantalum
capacitor to ground.
INT
This is the active low interrupt output. INT
goes low at the end of each conversion, and
returns to a high state following the rising
edge of RD.
S/H
This is the Sample/Hold control input. When
this pin is forced low (and CS is low), it
causes the analog input signal to be sampled
and initiates a new conversion.
RD
This is the active low Read control input.
When this RD and CS are low, any data
present in the output registers will be placed
on the data bus.
CS
This is the active low Chip Select control in-
put. When low, this pin enables the RD and
S/H pins.
S0, S1
On the multiple-input devices (ADC10062
and ADC10064), these pins select the analog
input that will be connected to the A/D during
the conversion. The input is selected based
on the state of S0 and S1 when S/H makes its
High-to-Low transition (See the Timing Dia-
grams). The ADC10064 includes both S0 and
S1. The ADC10062 includes just S0, and the
ADC10061 includes neither.
V
REF−,VREF+
These are the reference voltage inputs. They
may be placed at any voltage between GND
and V
CC, but VREF+ must be greater than
V
REF−. An input voltage equal to VREF− pro-
duces an output code of 0, and an input volt-
age equal to (V
REF+ − 1 LSB) produces an
output code of 1023.
V
IN,VIN0,VIN1,VIN2,
V
IN3
These are the analog input pins. The
ADC10061
has
one
input
(V
IN),
the
ADC10062 has two inputs (V
IN0 and VIN1),
and the ADC10064 has four inputs (V
IN0,
V
IN1,VIN2 and VIN3). The impedance of the
source should be less than 500
Ω for best
accuracy and conversion speed. For accurate
conversions, no input pin (even one that is
not selected) should be driven more than
50 mV above V
CC or 50 mV below ground.
GND, AGND, DGND
These are the power supply ground pins. The
ADC10061 has a single ground pin (GND),
and the ADC10062 and ADC10064 have
separate analog and digital ground pins
(AGND and DGND) for separate bypassing of
the analog and digital supplies. The ground
pins should be connected to a stable,
noise-free system ground. For the devices
with two ground pins, both pins should be
returned to the same potential.
DB0–DB9
These are the TRI-STATE® output pins.
SPEED ADJ
(ADC10062 and ADC10064 only). This pin is
normally left unconnected, but by connecting
a resistor between this pin and ground, the
conversion time can be reduced. See the
Typical Performance Curves and the table of
Electrical Characteristics.
www.national.com
3


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