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ADC12662CIV bảng dữ liệu(PDF) 2 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
tên linh kiện ADC12662CIV
Giải thích chi tiết về linh kiện  12-Bit, 1.5 MHz, 200 mW A/D Converter with Input Multiplexer and Sample/Hold
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Trang chủ  http://www.national.com
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ADC12662CIV bảng dữ liệu(HTML) 2 Page - National Semiconductor (TI)

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Connection Diagrams
01187615
Top View
01187629
Top View
Pin Descriptions
AV
CC
These are the two positive analog supply
inputs. They should always be connected to
the same voltage source, but are brought out
separately to allow for separate bypass ca-
pacitors. Each supply pin should be by-
passed to AGND with a 0.1 µF ceramic ca-
pacitor in parallel with a 10 µF tantalum
capacitor.
DV
CC
This is the positive digital supply input. It
should always be connected to the same
voltage as the analog supply, AV
CC. It should
be bypassed to DGND2 with a 0.1 µF ce-
ramic capacitor in parallel with a 10 µF tan-
talum capacitor.
AGND,
DGND1,
DGND2
These are the power supply ground pins.
There are separate analog and digital ground
pins for separate bypassing of the analog
and digital supplies. The ground pins should
be connected to a stable, noise-free system
ground. All of the ground pins should be
returned to the same potential. AGND is the
analog ground for the converter. DGND1 is
the ground pin for the digital control lines.
DGND2 is the ground return for the output
databus. See Section 6.0 LAYOUT AND
GROUNDING for more information.
DB0–DB11
These are the TRI-STATE output pins, en-
abled by RD, CS, and OE.
V
IN1,VIN2
These are the analog input pins to the multi-
plexer. For accurate conversions, no input
pin (even one that is not selected) should be
driven more than 50 mV below ground or 50
mV above V
CC.
MUX OUT
This is the output of the on-board analog
input multiplexer.
ADC IN
This is the direct input to the 12-bit sampling
A/D converter. For accurate conversions,
this pin should not be driven more than 50
mV below ground or 50 mV above V
CC.
S0
This pin selects the analog input that will be
connected to the ADC12662 during the con-
version. The input is selected based on the
state of S0 when EOC makes its high-to-low
transition. Low selects V
IN1,
high selects
V
IN2.
MODE
This pin should be tied to DGND1.
CS
This is the active low Chip Select control
input. When low, this pin enables the RD,
S/H, and OE inputs. This pin can be tied low.
INT
This is the active low Interrupt output. When
using the Interrupt Interface Mode (
Figure 1),
this output goes low when a conversion has
been completed and indicates that the con-
version result is available in the output
latches. This output is always high when RD
is held low (
Figure 2).
EOC
This is the End-of-Conversion control output.
This output is low during a conversion.
RD
This is the active low Read control input.
When RD is low (and CS is low), the INT
output is reset and (if OE is high) data ap-
pears on the data bus. This pin can be tied
low.
OE
This is the active high Output Enable control
input. This pin can be thought of as an in-
verted version of the RD input (see
Figure 6).
Data output pins DB0–DB11 are TRI-STATE
when
OE
is
low.
Data
appears
on
DB0–DB11 only when OE is high and CS
and RD are both low. This pin can be tied
high.
S/H
This is the Sample/Hold control input. The
analog input signal is held and a new conver-
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