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ADC10462CIWM Datasheet(PDF) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # ADC10462CIWM
Description  10-Bit 600 ns A/D Converter with Input Multiplexer and Sample/Hold
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

ADC10462CIWM Datasheet(HTML) 3 Page - National Semiconductor (TI)

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Pin Descriptions
Pin Function
Description
DV
CC,AVCC
Digital and analog positive supply voltage inputs. Connect both to the same voltage source, but
bypass separately with a 0.1 µF ceramic capacitor in parallel with a 10 µF tantalum capacitor to
ground at each pin.
INT
Active low interrupt output. INT goes low at the end of each conversion, and returns high
following the rising edge of RD.
S/H
Sample/Hold control input. When this pin is forced low (and CS is low), the analog input signal is
sampled and a new conversion is initiated.
RD
Active low read control input. When this RD and CS are low, any data present in the output
registers will be placed onto the data bus.
CS
Active low Chip Select control input. When low, this pin enables the RD and S/H pins.
S0, S1
On the multiple-input devices (ADC10462 and ADC10464), 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 Diagrams). The
ADC10464 includes both S0 and S1. The ADC10462 includes just S0, and the ADC10461 has
neither.
V
REF−,VREF+
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− produces an output code of 0, and
an input voltage equal to (V
REF+ − 1 LSB) produces an output code of 1023.
V
IN,VIN0,VIN1,
V
IN2,VIN3
Analog input pins. The ADC10461 has one input (V
IN), the ADC10462 has two inputs (VIN0 and
V
IN1), and the ADC10464 has four inputs (VIN0,VIN1,VIN2 and VIN3). The impedance of the input
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
Power supply ground pins. The ADC10461 has a single ground pin (GND), and the ADC10462
and ADC10464 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
TRI-STATE® data output pins.
SPEED ADJ
(ADC10462 and ADC10464 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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