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ADS1013 Arkusz danych(PDF) 9 Page - Texas Instruments

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Numer części ADS1013
Szczegółowy opis  Ultra-Small, Low-Power, 12-Bit Analog-to-Digital Converter with Internal Reference
Download  33 Pages
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Producent  TI1 [Texas Instruments]
Strona internetowa  http://www.ti.com
Logo TI1 - Texas Instruments

ADS1013 Arkusz danych(HTML) 9 Page - Texas Instruments

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VDD
GND
AIN0
VDD
GND
AIN1
VDD
GND
AIN2
VDD
GND
AIN3
AIN
P
AIN
N
GND
ADS1015
t
SAMPLE
ON
OFF
S
1
S
2
OFF
ON
ADS1013
ADS1014
ADS1015
www.ti.com
SBAS473C – MAY 2009 – REVISED OCTOBER 2009
MULTIPLEXER
If it is possible that the voltages on the input pins may
violate these conditions, external Schottky clamp
The ADS1015 contains an input multiplexer, as
diodes and/or series resistors may be required to limit
shown in Figure 10. Either four single-ended or two
the input current to safe values (see the Absolute
differential signals can be measured. Additionally,
Maximum Ratings table).
AIN0 and AIN1 may be measured differentially to
AIN3. The multiplexer is configured by three bits in
Also, overdriving one unused input on the ADS1015
the Config register. When single-ended signals are
may affect conversions taking place on other input
measured, the negative input of the ADC is internally
pins. If overdrive on unused inputs is possible, again
connected to GND by a switch within the multiplexer.
it is recommended to clamp the signal with external
Schottky diodes.
ANALOG INPUTS
The ADS1013/4/5 use a switched-capacitor input
stage where capacitors are continuously charged and
then discharged to measure the voltage between
AINP and AINN. The capacitors used are small, and to
external
circuitry
the
average
loading
appears
resistive. This structure is shown in Figure 12. The
resistance is set by the capacitor values and the rate
at which they are switched. Figure 11 shows the
on/off setting of the switches illustrated in Figure 12.
During the sampling phase, S1 switches are closed.
This event charges CA1 to AINP, CA2 to AINN, and CB
to (AINP – AINN). During the discharge phase, S1 is
first opened and then S2 is closed. Both CA1 and CA2
then
discharge
to
approximately
0.7V
and
CB
discharges to 0V. This charging draws a very small
transient
current
from
the
source
driving
the
Figure 10. ADS1015 MUX
ADS1013/4/5 analog inputs. The average value of
this current can be used to calculate the effective
The
ADS1013
and
ADS1014
do
not
have
a
impedance (Reff) where Reff = VIN/IAVERAGE.
multiplexer.
Either
one
differential
or
one
single-ended signal may be measured with these
devices. For single-ended measurements, connect
the AIN1 pin to GND. Note that in subsequent
sections of this data sheet, AINP refers to AIN0 and
AINN refers to AIN1 for the ADS1013 and ADS1014.
When measuring single-ended inputs it is important to
note that the negative range of the output codes are
not used. These codes are for measuring negative
Figure 11. S1 and S2 Switch Timing for Figure 12
differential signals such as (AINP – AINN) < 0. ESD
diodes to VDD and GND protect the inputs on all
three devices (ADS1013, ADS1014, and ADS1015).
To prevent the ESD diodes from turning on, the
absolute voltage on any input must stay within the
following range:
GND – 0.3V < AINx < VDD + 0.3V
Copyright © 2009, Texas Instruments Incorporated
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