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ADS8513IDW Datenblatt(PDF) 5 Page - Texas Instruments

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Teilenummer ADS8513IDW
Bauteilbeschribung  16-Bit, 40kSPS, Low-Power Sampling ANALOG-TO-DIGITAL CONVERTER with Internal Reference and Parallel/Serial Interface
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Hersteller  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
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PIN CONFIGURATION
VS
BUSY
CS
DATACLK
R1IN
GND
BUF
CAP
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
R2IN
REF
EXT/INT
DATA
PWRD
R3IN
GND
CONV
ADS8513
www.ti.com ...................................................................................................................................................... SLAS486C – JUNE 2007 – REVISED JANUARY 2009
DW PACKAGE
SO-16
(TOP VIEW)
Pin Assignments
PIN
DIGITAL
NAME
NO.
I/O
DESCRIPTION
R1IN
1
Analog input. See Table 1 and Table 3.
R2IN
3
Analog input. See Table 1 and Table 3.
R3IN
4
Analog input. See Table 1 and Table 3.
BUF
5
Reference buffer output. Connect to R1IN, R2IN, or R3IN as needed
6
Reference buffer compensation node. Decouple to ground with a 1-
µF tantalum capacitor in parallel
CAP
with a 0.01
µF ceramic capacitor.
7
Reference input/output. Outputs internal 2.5V reference via a series 4k
Ω resistor. Decouple this
REF
voltage with a 1
µF to 2.2µF tantalum capacitor to ground. If an external reference voltage is applied
to this pin, it overrides the internal reference.
9
I/O
Data clock pin. With EXT/INT low, this pin is an output and provides the synchronous clock for the
DATACLK
serial data. The output is 3-stated when CS is high. With EXT/INT high, this pin is an input and the
serial data clock must be provided externally.
10
O
Serial data output. The serial data are always the result of the last completed conversion and are
DATA
synchronized to DATACLK. If DATACLK is from the internal clock (EXT/INT low), the serial data are
valid on both the rising and falling edges of DATACLK. DATA is 3-stated when CS is high.
11
I
External/Internal DATACLK pin. Selects the source of the synchronous clock for serial data. If high,
the clock must be provided externally. If low, the clock is derived from the internal conversion clock.
EXT/INT
Note that the clock used to time the conversion is always interna,l regardless of the status of
EXT/INT.
12
Convert input. A falling edge on this input puts the internal sample/hold into the hold state and starts
a conversion regardless of the state of CS. If a conversion is already in progress, the falling edge is
CONV
ignored. If EXT/INT is low, data from the previous conversion are serially transmitted during the
current conversion.
13
I
Chip select. This input 3-states all outputs when high and enables all outputs when low, including
CS
DATA, BUSY, and DATACLK (when EXT/INT is low). Note that a falling edge on CONV initiates a
conversion even when CS is high.
14
O
Busy output. When a conversion starts, BUSY goes low and remains low throughout the conversion.
BUSY
If EXT/INT is low, data are serially transmitted while BUSY is low. BUSY is 3-stated when CS is
high.
15
I
Power-down input. When high, the majority of the ADS8513 circuitry is placed in a low-power mode
and power consumption is significantly reduced. (The ADS7813 requires CONV be taken low before
PWRD goes low in order to achieve the lowest power consumption. This is not necessary for the
PWRD
ADS8513 and it does not cause interference if performed.) The time required for the ADS7813 to
return to normal operation after power down depends on a number of factors. Consult the Chapter 0
section for more information.
GND
2, 8
Ground.
16
+5V supply input. For best performance, decouple to ground with a 0.1
µF ceramic capacitor in
VS
parallel with a 10
µF tantalum capacitor.
Copyright © 2007–2009, Texas Instruments Incorporated
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