ADS1218 CONVERTER Datasheet

ADS1218 Datasheet, PDF, Equivalent


Part Number

ADS1218

Description

24-Bit ANALOG-TO-DIGITAL CONVERTER

Manufacture

Burr-Brown

Total Page 30 Pages
Datasheet
Download ADS1218 Datasheet


ADS1218
BurrĆBrown Products
from Texas Instruments
ADS1218
SBAS187C – SEPTEMBER 2001 – REVISED SEPTEMBER 2005
8-Channel, 24-Bit
ANALOG-TO-DIGITAL CONVERTER with FLASH Memory
FEATURES
24 BITS NO MISSING CODES
0.0015% INL
22 BITS EFFECTIVE RESOLUTION (PGA = 1),
19 BITS (PGA = 128)
4K BYTES OF FLASH MEMORY
PROGRAMMABLE FROM 2.7V TO 5.25V
PGA FROM 1 TO 128
SINGLE CYCLE SETTLING MODE
PROGRAMMABLE DATA OUTPUT RATES UP
TO 1kHz
PRECISION ON-CHIP 1.25V/2.5V REFERENCE:
ACCURACY: 0.2%
DRIFT: 5ppm/°C
EXTERNAL DIFFERENTIAL REFERENCE OF
0.1V TO 2.5V
ON-CHIP CALIBRATION
PIN-COMPATIBLE WITH ADS1216
SPI™ COMPATIBLE
2.7V TO 5.25V
< 1mW POWER CONSUMPTION
APPLICATIONS
INDUSTRIAL PROCESS CONTROL
LIQUID/GAS CHROMATOGRAPHY
BLOOD ANALYSIS
SMART TRANSMITTERS
PORTABLE INSTRUMENTATION
WEIGHT SCALES
PRESSURE TRANSDUCERS
DESCRIPTION
The ADS1218 is a precision, wide dynamic range,
delta-sigma, Analog-to-Digital (A/D) converter with
24-bit resolution and Flash memory operating from
2.7V to 5.25V supplies. The delta-sigma, A/D
converter provides up to 24 bits of no missing code
performance and effective resolution of 22 bits.
The eight input channels are multiplexed. Internal
buffering can be selected to provide a very high input
impedance for direct connection to transducers or
low-level voltage signals. Burnout current sources are
provided that allow for the detection of an open or
shorted sensor. An 8-bit Digital-to-Analog (D/A)
converter provides an offset correction with a range
of 50% of the FSR (Full-Scale Range).
The PGA (Programmable Gain Amplifier) provides
selectable gains of 1 to 128 with an effective
resolution of 19 bits at a gain of 128. The A/D
conversion is accomplished with a second-order
delta-sigma modulator and programmable sinc filter.
The reference input is differential and can be used for
ratiometric conversion. The on-board current DACs
(Digital-to-Analog Converters) operate independently
with the maximum current set by an external resistor.
The serial interface is SPI-compatible. Eight bits of
digital I/O are also provided that can be used for input
or output. The ADS1218 is designed for
high-resolution measurement applications in smart
transmitters, industrial process control, weight scales,
chromatography, and portable instrumentation.
AGND AVDD
RDAC
VREFOUT
VRCAP
VREF+
VREF
XIN
XOUT
IDAC2
IDAC1
8−Bit
IDAC
8−Bit
IDAC
1.25V or
2.5V
Reference
Clock Generator
Offset
DAC
AIN0
AIN1
AIN2
AIN3
AIN4
AIN5
AIN6
AIN7
AINCOM
MUX
BUF
+ PGA
Digital I/O
Interface
DVDD DGND BUFEN
D0 ... D7
2nd−Order
Modulator
Program−
mable
Digital
F ilter
Registers
Controller
RAM
4K Bytes
FLASH
WREN
Serial Interface
PDWN DSYNC RESET DRDY
POL
SCLK
DIN
DOUT
CS
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.
SPI is a trademark of Motorola.
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 the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2001–2005, Texas Instruments Incorporated

ADS1218
ADS1218
SBAS187C – SEPTEMBER 2001 – REVISED SEPTEMBER 2005
www.ti.com
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated
circuits be handled with appropriate precautions. Failure to observe proper handling and installation
procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision
integrated circuits may be more susceptible to damage because very small parametric changes could
cause the device not to meet its published specifications.
ORDERING INFORMATION
For the most current package and ordering information, see the Package Option Addendum at the end of this
document, or see the TI web site at www.ti.com.
ABSOLUTE MAXIMUM RATINGS(1)
AVDD to AGND
DVDD to DGND
Input Current
Input Current
AIN
AVDD to DVDD
AGND to DGND
Digital Input Voltage to GND
Digital Output Voltage to GND
Maximum Junction Temperature
Operating Temperature Range
Storage Temperature Range
Lead Temperature (soldering, 10s)
–0.3V to +6V
–0.3V to +6V
100mA, Momentary
10mA, Continuous
GND – 0.5V to AVDD + 0.5V
–6V to +6V
–0.3V to +0.3V
–0.3V to DVDD + 0.3V
–0.3V to DVDD + 0.3V
+150°C
–40°C to +85°C
–60°C to +100°C
+300°C
(1) Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to absolute
maximum conditions for extended periods may affect device reliability.
2


Features BurrĆBrown Products from Texas Instrume nts ADS1218 SBAS187C – SEPTEMBER 20 01 – REVISED SEPTEMBER 2005 8-Channel , 24-Bit ANALOG-TO-DIGITAL CONVERTER wi th FLASH Memory FEATURES • 24 BITS N O MISSING CODES • 0.0015% INL • 22 BITS EFFECTIVE RESOLUTION (PGA = 1), 19 BITS (PGA = 128) • 4K BYTES OF FLASH MEMORY PROGRAMMABLE FROM 2.7V TO 5.25V • PGA FROM 1 TO 128 • SINGLE CYCLE SETTLING MODE • PROGRAMMABLE DATA OU TPUT RATES UP TO 1kHz • PRECISION ON- CHIP 1.25V/2.5V REFERENCE: ACCURACY: 0. 2% DRIFT: 5ppm/°C • EXTERNAL DIFFERE NTIAL REFERENCE OF 0.1V TO 2.5V • ON- CHIP CALIBRATION • PIN-COMPATIBLE WIT H ADS1216 • SPI™ COMPATIBLE • 2.7 V TO 5.25V • < 1mW POWER CONSUMPTION APPLICATIONS • INDUSTRIAL PROCESS CON TROL • LIQUID/GAS CHROMATOGRAPHY • BLOOD ANALYSIS • SMART TRANSMITTERS PORTABLE INSTRUMENTATION • WEIGHT SCALES • PRESSURE TRANSDUCERS DESCRIP TION The ADS1218 is a precision, wide d ynamic range, delta-sigma, Analog-to-Digital (A/D) converter with 24-bit resolution and Flash memory operating fr.
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