ADS1218 Status: ACTIVE

24-Bit, 780 SPS ADC w/FLASH Memory, 8 CH, Vref, Buffer, 2 IDACs, Serial Out, Digital I/O, Low Power

Burr-Brown

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Datasheet

8-Channel, 24-Bit, Analog-to-Digital Converter with FLASH Memory (Rev. C) (ads1218.pdf, 868 KB)
26 Sep 2005 Download

	ADS1216	ADS1217	ADS1218	ADS1240	ADS1241	ADS1242	ADS1243	ADS1248	ADS1256
Resolution(Bits)	24	24	24	24	24	24	24	24	24
Sample Rate (max)	780SPS	780SPS	780SPS	15SPS	15SPS	15SPS	15SPS	2KSPS	30kSPS
Architecture	Delta-Sigma	Delta-Sigma	Delta-Sigma	Delta-Sigma	Delta-Sigma	Delta-Sigma	Delta-Sigma		Delta-Sigma
Power Consumption(Typ)(mW)	0.6	0.8	0.8	0.6	0.6	0.6	0.6	2.56	36
DNL(Max)(+/-LSB)	1	1	1	1	1	1	1		2
INL(Max)(+/-LSB)	0.0015%	0.0015%	0.0015%	0.0015%	0.0015%	0.0015%	0.0015%		0.0003%
No Missing Codes(Bits)	24	24	24	24	24	24	24	24	24
ENOB(Bits)									23
No. of Supplies	2	2	2	2	2	1	1	3	2
Analog Voltage AV/DD(Min)(V)	2.7	2.7	2.7	2.7	2.7	2.7	2.7	2.5	4.75
Analog Voltage AV/DD(Max)(V)	5.25	5.25	5.25	5.25	5.25	5.25	5.25	5.8	5.25
Logic Voltage DV/DD(Min)(V)	2.7	2.7	2.7	2.7	2.7	2.7	2.7	2.5	1.8
Logic Voltage DV/DD(Max)(V)	5.25	5.25	5.25	5.25	5.25	5.25	5.25	5.8	3.6
Input Configuration Range	Vref/PGA (1-128)	Vref/PGA (1-128)	Vref/PGA (1-128)	Vref/PGA (1-128)	Vref/PGA (1-128)	Vref/PGA (1-128)	Vref/PGA (1-128)	+/- Vref / PGA	2Vref/PGA(1-64
Reference Mode	Int	Int	Int	Ext	Ext	Ext	Ext	Int/Ext	Ext
Rating	Catalog	Catalog	Catalog	Catalog	Catalog	Catalog	Catalog	Catalog	Catalog
Pin/Package	48TQFP	48TQFP	48TQFP	24SSOP	28SSOP	16TSSOP	20TSSOP	28TSSOP	28SSOP
# Input Channels	8	8	8	4	8	4	8	7	8
	Samples	Samples	Samples	Samples	Samples	Samples	Samples	Samples	Samples
	Inventory	Inventory	Inventory	Inventory	Inventory	Inventory	Inventory	Inventory	Inventory

Customers Who Evaluated This Product Also Evaluated

ADS1256: 24 Bit, 30kSPS Very Low Noise Delta-Sigma ADC with Multiplexer
ADS1217: 8-Channel, 24-Bit Analog-To-Digital Converter
ADS1258: 24 Bit, Fast Channel Cycling Delta-Sigma ADC
DAC8552: 16-Bit, Dual-Channel, Ultralow Glitch, Voltage Output, Digital to Analog Converter
DAC908: 8-Bit, 165MSPS SpeedPlus(TM) DAC Scalable Current Outputs between 2mA to 20mA
DAC8541: Low Power, 16-Bit D-to-A Converter W/1.8V Compatible Parallel IF, Rail-to-Rail Voltage Output

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Product Information

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

SPI is a trademark of Motorola.
All trademarks are the property of their respective owners.

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.

Pricing / Packaging / CAD Design Tools / Samples

		Price	Packaging			CAD Design Tools		Samples
Device	Status	Price \| Quantity	Package \| Pins	Top Side Marking	Package QTY \| Package Carrier	Symbols	Footprints	Samples
ADS1218Y/250	ACTIVE	7.40 \| 100u	TQFP (PFB) \| 48	View	250 \| SMALL T&R
ADS1218Y/250G4	ACTIVE	7.40 \| 100u	TQFP (PFB) \| 48	View	250 \| SMALL T&R

* Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For higher volume price quotes,prices in local currency or delivery quotes, please contact your local Texas Instruments Sales Office or Authorized Distributor.

Inventory

	TI Inventory Status			Reported Distributor Inventory
ADS1218Y/250	As of 10:18 AM GMT, 19 Nov 2008			As of 10:18 AM GMT, 19 Nov 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	0*	>10k \| 28 Jan	12 Weeks	Americas	DigiKey	700
					Mouser Electronics	252
					Newark	464
				Asia	WPI	113
ADS1218Y/250G4	As of 10:18 AM GMT, 19 Nov 2008			As of 10:18 AM GMT, 19 Nov 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	0*	>10k \| 28 Jan	12 Weeks	None Reported View Distributors
View all Distributors

* Our information is updated daily, so please check back with us soon if this does not meet your needs. You may also contact your TI Authorized Distributor , including those listed above, for real time stock information.

** Lead time information is not available at this time. However, our information is updated daily so please check back with us soon. Please contact your preferred TI Authorized Distributor for additional information.

Quality & Lead (Pb)-Free Data

	Product Content				DPPM / MTBF / FIT Rate
Device	Eco Plan*	Lead / Ball Finish	MSL Rating / Peak Reflow	Details	Details
ADS1218Y/250	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
ADS1218Y/250G4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View

* The planned eco-friendly classification: Pb-Free (RoHS) or Pb-Free (RoHS Exempt) or Green (RoHS & no Sb/Br) - please click on the Product Content Details "View" link in the table above for the latest availability information and additional product content details.

If the information you are requesting is not available online at this time, contact one of our Product Information Centers regarding the availability of this information.

Technical Documents

Datasheets

8-Channel, 24-Bit, Analog-to-Digital Converter with FLASH Memory (Rev. C) (ads1218.pdf, 868 KB)
26 Sep 2005 Download

Application Notes

A Glossary of Analog-to-Digital Specifications and Performance Characteristics (Rev. A) (sbaa147a.htm, 8 KB)
12 Jan 2008 Abstract
Measuring Single-Ended 0V-5V Signals with Differential Delta-Sigma ADCs (sbaa133.htm, 8 KB)
25 Aug 2005 Abstract
Shelf-Life Evaluation of Lead-Free Component Finishes (szza046.htm, 8 KB)
24 May 2004 Abstract
Measuring Temperature with the ADS1216, ADS1217, or ADS1218 (Rev. A) (sbaa073a.htm, 8 KB)
17 Feb 2004 Abstract
Calibration Routines and Register Value Generation for the ADS121x Series (sbaa099.htm, 8 KB)
19 Jun 2003 Abstract
Inputs Currents for High-Resolution ADCs (sbaa090.htm, 8 KB)
06 Mar 2003 Abstract
Thermal and Electrical Properties of Selected Packaging Materials (sbfa010.htm, 8 KB)
04 Oct 2000 Abstract
Analog-to-Digital Converter Grounding Practices Affect System Performance (sbaa052.htm, 8 KB)
02 Oct 2000 Abstract
Principles of Data Acquisition and Conversion (sbaa051.htm, 8 KB)
02 Oct 2000 Abstract
Interleaving Analog-to-Digital Converters (sbaa049.htm, 8 KB)
02 Oct 2000 Abstract
What Designers Should Know About Data Converter Drift (sbaa046.htm, 8 KB)
02 Oct 2000 Abstract
High Speed Data Conversion (sbaa045.htm, 8 KB)
02 Oct 2000 Abstract
Giving Delta-Sigma Converters a Gain Boost with a Front End Analog Gain Stage (sbaa006.htm, 8 KB)
27 Sep 2000 Abstract
Programming Tricks for Higher Conversion Speeds Utilizing Delta Sigma Converters (sbaa005.htm, 8 KB)
27 Sep 2000 Abstract

View Application Notes for Analog to Digital Converters

User Guides

ADS1218EVM Demo Board (sbau068.pdf, 639 KB)
01 Jun 2001 Download

View User Guides for Analog to Digital Converters

More Literature

View More Literature for Analog to Digital Converters

Tools & Software

Name	Part #	Company	Tool / Software Type
Anti-Aliasing Calculation Tool for A to D Converters	ANTIALIASINGCALC	Texas Instruments	Calculation Utilities
Op Amp to ADC Circuit Topology Calculator	ADC-INPUT-CALC	Texas Instruments	Calculation Utilities
ADS1218 Evaluation Module	ADS1218EVM	Texas Instruments	Development Boards/EVMs
DCPFREETOOL Software Plug-In to Code Composer Studio	DCPFREETOOL	Texas Instruments	Utilities/Plug-Ins
Data Converter Plug-in for Code Composer Studio (Rev. D)(slac087d.zip, 5199 KB ) 05 May 2008 zip

Alternative Products - Are similar to ADS1218
Part #	Name	Comments
ADS1256	24 Bit, 30kSPS Very Low Noise Delta-Sigma ADC with Multiplexer	The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device. Has a higher sampling rate as compared to ADS1218
ADS1234	24-Bit, Ultra Low-Noise Analog-to-Digital Converter	The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device.
ADS1217	8-Channel, 24-Bit Analog-To-Digital Converter	The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device.
ADS1216	24-Bit Analog-to-Digital Converter	The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device.
ADS1241	24-Bit Analog-to-Digital Converter	The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device. Has a lower sampling rate as compared to ADS1218
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Complementary Products - Can be used with ADS1218
Part #	Name	Product Family	Comments
OPA277	High Precision Operational Amplifiers	PRECISION AMPLIFIERS- LOW OFFSET VOLTAGE	OPERATIONAL AMPLIFIER
OPA211	1.1nV/rtHz Noise, Low Power, Precision Operational Amplifier in Tiny DFN-8 Package	PRECISION AMPLIFIERS- LOW NOISE	OPERATIONAL AMPLIFIER
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