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PDF ADS1112 Data sheet ( Hoja de datos )
| Número de pieza | ADS1112 | |
| Descripción | 16-Bit Analog-to-Digital Converter with Input Multiplexer and Onboard Reference | |
| Fabricantes | Burr-Brown Corporation | |
| Logotipo |  |
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ADS1112
SBAS282D − JUNE 2003 − REVISED MARCH 2004
16-Bit Analog-to-Digital Converter with
Input Multiplexer and Onboard Reference
FEATURES
D COMPLETE DATA ACQUISITION SYSTEM IN
THE MSOP-10 AND LEADLESS QFN-STYLE
PACKAGES
D MEASUREMENTS FROM TWO DIFFERENTIAL
CHANNELS OR THREE SINGLE-ENDED
CHANNELS
D I2CINTERFACE—EIGHT ADDRESSES PIN-
SELECTABLE
D ONBOARD REFERENCE:
Accuracy: 2.048V ±0.05%
Drift: 5ppm/°C
D ONBOARD PGA
D ONBOARD OSCILLATOR
D 16 BITS, NO MISSING CODES
D INL: 0.01% of FSR max
D CONTINUOUS SELF-CALIBRATION
D SINGLE-CYCLE CONVERSION
D PROGRAMMABLE DATA RATE: 15SPS to
240SPS
D POWER SUPPLY: 2.7V to 5.5V
D LOW CURRENT CONSUMPTION: 240µA
APPLICATIONS
D PORTABLE INSTRUMENTATION
D INDUSTRIAL PROCESS CONTROL
D SMART TRANSMITTERS
D CONSUMER GOODS
D FACTORY AUTOMATION
D TEMPERATURE MEASUREMENT
DESCRIPTION
The ADS1112 is a precision, continuously self-calibrating
Analog-to-Digital (A/D) converter with two differential or three
single-ended channels and up to 16 bits of resolution in the
small MSOP-10 and leadless QFN-style (small-outline,
no-lead) packages. The onboard 2.048V reference provides
an input range of ±2.048V differentially. The ADS1112 uses
an I2C-compatible serial interface and has two address pins
that allow a user to select one of the eight I2C Slave
addresses. The ADS1112 operates from a single power
supply ranging from 2.7V to 5.5V.
The ADS1112 can perform conversions at rates of 15, 30, 60,
or 240 samples per second (SPS). The onboard
programmable gain amplifier (PGA), which offers gains of up
to eight, allows smaller signals to be measured with high
resolution. In single-conversion mode, the ADS1112
automatically powers down after a conversion, greatly
reducing current consumption during idle periods.
The ADS1112 is designed for applications requiring
high-resolution measurement, where space and power
consumption are major considerations. Typical applications
include portable instrumentation, industrial process control,
and smart transmitters.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments
semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date. Products
conform to specifications per the terms of Texas Instruments standard warranty.
Production processing does not necessarily include testing of all parameters.
Copyright 2003−2004, Texas Instruments Incorporated
www.ti.com
1 page  
www.ti.com
TYPICAL CHARACTERISTICS (continued)
At TA = 25°C and VDD = 5V, unless otherwise noted.
ADS1112
SBAS282D − JUNE 2003 − REVISED MARCH 2004
5
5 Page 
ADS1112
www.ti.com
CONFIGURATION REGISTER
The 8-bit configuration register can be used to control the
ADS1112 operating mode, input selection, data rate, and
PGA settings. The configuration register format is shown
in Table 6. The default setting is 8CH.
BIT 7 6 5 4 3 2 1 0
NAME ST/DRDY INP1 INP0 SC DR1 DR0 PGA1 PGA0
DEFAULT
1
0 001 1 0 0
Table 6. Configuration Register
Bit 7: ST/DRDY
The meaning of the ST/DRDY bit depends on whether it is
being written to or read from.
In single conversion mode, writing a 1 to the ST/DRDY bit
causes a conversion to start, and writing a 0 has no effect.
In continuous conversion mode, the ADS1112 ignores the
value written to ST/DRDY.
When read, ST/DRDY indicates whether the data in the
output register is new data. If ST/DRDY is 0, the data just
read from the output register is new, and has not been read
before. If ST/DRDY is 1, the data just read from the output
register has been read before.
The ADS1112 sets ST/DRDY to 0 when it writes data into
the output register. It sets ST/DRDY to 1 after any of the
bits in the configuration register have been read. (Note that
the read value of the bit is independent of the value written
to this bit.)
In continuous-conversion mode, use ST/DRDY to
determine when new conversion data is ready. If
ST/DRDY is 1, the data in the output register has already
been read, and is not new. If it is 0, the data in the output
register is new, and has not yet been read.
In single-conversion mode, use ST/DRDY to determine
when a conversion has completed. If ST/DRDY is 1, the
output register data is old, and the conversion is still in
process; if it is 0, the output register data is the result of the
new conversion.
Note that the output register is returned from the ADS1112
before the configuration register. The state of the
ST/DRDY bit applies to the data just read from the output
register, and not to the data from the next read operation.
SBAS282D − JUNE 2003 − REVISED MARCH 2004
Bits 6-5: INP
INP controls which two of the four analog inputs are used
to measure data in the ADC. This is shown in Table 7. By
selecting these bits, the ADS1112 can be used to measure
two differential channels or three single ended channels
referenced to AIN3.
INP1
0(1)
0
1
1
(1) Default setting.
INP0
0(1)
1
0
1
VIN+
AIN0
AIN2
AIN0
AIN1
Table 7. INP Bits.
VIN−
AIN1
AIN3
AIN3
AIN3
Bit 4: SC
SC controls whether the ADS1112 is in continuous
conversion or single conversion mode. When SC is 1, the
ADS1112 is in single conversion mode; when SC is 0, it is
in continuous conversion mode. The default setting is 0.
Bits 3-2: DR
Bits 3 and 2 control the ADS1112 data rate, as shown in
Table 8.
DR1
0
0
1
1(1)
(1) Default setting.
DR0
0
1
0
1(1)
DATA RATE
240SPS
60SPS
30SPS
15SPS(1)
Table 8. INP Bits.
RESOLUTION
12 Bits
14 Bits
15 Bits
16 Bits(1)
Bits 1-0: PGA
Bits 1 and 0 control the ADS1112 gain setting, as shown
in Table 9.
PGA1
0(1)
0
1
1
(1) Default setting.
PGA0
0(1)
1
0
1
Table 9. PGA Bits
GAIN
1(1)
2
4
8
11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet ADS1112.PDF ] | |
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