ADS1245 Status: ACTIVE

24-bit Low-Power ADC with High-Z Input Buffer

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Datasheet

ADS1245: Low-Power, 24-Bit Analog-to-Digital Converter (Rev. A) (PDF 442 KB)
14 Aug 2003

	ADS1244	ADS1245
Resolution(Bits)	24	24
Sample Rate (max)	30SPS	15SPS
Architecture	Delta-Sigma	Delta-Sigma
Power Consumption(Typ)(mW)	0.27	0.47
DNL(Max)(+/-LSB)	1	1
INL(Max)(+/-LSB)	0.0002%	0.0006%
No Missing Codes(Bits)	24	24
No. of Supplies	2	2
Analog Voltage AV/DD(Min)(V)	2.5	2.5
Analog Voltage AV/DD(Max)(V)	5.25	5.25
Logic Voltage DV/DD(Min)(V)	1.8	1.8
Logic Voltage DV/DD(Max)(V)	3.6	3.6
Input Configuration Range	2Vref	2Vref
Reference Mode	Ext	Ext
Rating	Catalog	Catalog
Pin/Package	10MSOP	10MSOP
# Input Channels	1	1
	Samples	Samples
	Inventory	Inventory

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Product Information

Features

20-Bit Effective Resolution
High-Impedance Buffered Input
±2.5V Differential Input Range
Pin-Compatible with ADS1244
0.0006% INL (typ), 0.0015% INL (max)
Simple Two-Wire Serial Interface
Simultaneous 50Hz and 60Hz Rejection
Single Conversions with Sleep Mode
Single-Cycle Settling
Self-Calibration
Well Suited for Multi-Channel Systems
Easily Connects to the MSP430
Current Consumption: 158µA
Analog Supply: 2.5V to 5.25V
Digital Supply: 1.8V to 3.6V
APPLICATIONS
- Hand-Held Instrumentation
- Portable Medical Equipment
- Industrial Process Control
- Test and Measurement Systems

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Description

The ADS1245 is a 24-bit, delta-sigma analog-to-digital converter (ADC). It offers excellent performance and very low power in an MSOP-10 package and is well suited for demanding high-resolution measurements, especially in portable and other space- and power-constrained systems.

The buffered input presents an impedance of 3G, minimizing measurement errors when using high-impedance sources. The ADS1245 is compatible with ADS1244 and offers a direct upgrade path for designs requiring higher input impedance.

A third-order delta-sigma () modulator and digital filter form the basis of the ADC. The analog modulator has a ±2.5V differential input range. The digital filter rejects both 50Hz and 60Hz signals, completely settles in one cycle, and outputs data at 15 samples per second (SPS).

A simple, two-wire serial interface provides all the necessary control. Data retrieval, self-calibration, and Sleep mode are handled with a few simple waveforms. When only single conversions are needed, the ADS1245 can be shut down (Sleep mode) while idle between measurements to dramatically reduce the overall power dissipation. Multiple ADS1245s can be connected together to create a synchronously sampling multichannel measurement system. The ADS1245 is designed to easily connect to microcontrollers, such as the MSP430.

The ADS1245 supports 2.5V to 5.25V analog supplies and 1.8V to 3.6V digital supplies. Power is typically less than 470µW in normal operation and less than 1µW during Sleep mode.

Pricing / Packaging / CAD Design Tools / Samples

			Price	Packaging			CAD Design Tools		Samples
Device	Status	Temp (^oC)	Price \| Quantity	Package \| Pins	Top Side Marking	Package QTY \| Package Carrier	Symbols	Footprints	Samples
ADS1245IDGSR	ACTIVE	-40 to 85	3.90 \| 1ku	MSOP (DGS) \| 10	View	2500 \| LARGE T&R	Purchase Samples
ADS1245IDGSRG4	ACTIVE	-40 to 85	3.90 \| 1ku	MSOP (DGS) \| 10	View	2500 \| LARGE T&R	Purchase Samples
ADS1245IDGST	ACTIVE	-40 to 85	4.30 \| 1ku	MSOP (DGS) \| 10	View	250 \| SMALL T&R
ADS1245IDGSTG4	ACTIVE	-40 to 85	4.30 \| 1ku	MSOP (DGS) \| 10	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

Reported Distributor Inventory as of 12:12 PM GMT, 08 Nov 2009
Region	Company	In Stock	Purchase
TI Lead Time*: 20 WeeksADS1245IDGSR
Worldwide	DigiKey	Available
TI Lead Time*: 20 WeeksADS1245IDGSRG4
Worldwide	DigiKey	Available
TI Lead Time*: 1 WeekADS1245IDGST
Americas	Rochester Electronics	>1k
Asia	WPI	323
Europe	Compel	200
Worldwide	DigiKey	195
TI Lead Time*: 1 WeekADS1245IDGSTG4
Worldwide	DigiKey	Available
View all Distributors

** 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
ADS1245IDGSR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
ADS1245IDGSRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
ADS1245IDGST	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
ADS1245IDGSTG4	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

Most useful technical documents for ADS1245

Datasheet

ADS1245: Low-Power, 24-Bit Analog-to-Digital Converter (Rev. A) (PDF, 442 KB)
14 Aug 2003

Application Notes

Thermal and Electrical Properties of Selected Packaging Materials (HTM, 8 KB) 15703 views
04 Oct 2000 Read Abstract
Shelf-Life Evaluation of Lead-Free Component Finishes (HTM, 8 KB) 26969 views
24 May 2004 Read Abstract
A Glossary of Analog-to-Digital Specifications and Performance Characteristics (Rev. A) (HTM, 8 KB) 17785 views
12 Jan 2008 Read Abstract
Data Capture with Multiple ADS1244 or ADS1245 Devices in Parallel (HTM, 8 KB) 438 views
02 Jun 2004 Read Abstract
Programming Tricks for Higher Conversion Speeds Utilizing Delta Sigma Converters (HTM, 8 KB) 4517 views
27 Sep 2000 Read Abstract
Giving Delta-Sigma Converters a Gain Boost with a Front End Analog Gain Stage (HTM, 8 KB) 4790 views
27 Sep 2000 Read Abstract
Interleaving Analog-to-Digital Converters (HTM, 8 KB) 7621 views
02 Oct 2000 Read Abstract
Analog-to-Digital Converter Grounding Practices Affect System Performance (HTM, 8 KB) 14427 views
02 Oct 2000 Read Abstract
Principles of Data Acquisition and Conversion (HTM, 8 KB) 16061 views
02 Oct 2000 Read Abstract
High Speed Data Conversion (HTM, 8 KB) 22219 views
02 Oct 2000 Read Abstract
What Designers Should Know About Data Converter Drift (HTM, 8 KB) 9810 views
02 Oct 2000 Read Abstract

View Application Notes for Analog to Digital Converter

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

Part #	Name	Product Family	Comments
ADS1244	24-Bit 15sps Delta-Sigma ADC with 50 & 60Hz rejection	DATA CONVERTERS - ANALOG TO DIGITAL CONVERTER	The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device. 5V input voltage as compared to ADS1245's 2.5V
ADS1258	24 Bit, Fast Channel Cycling Delta-Sigma ADC	DATA CONVERTERS - ANALOG TO DIGITAL CONVERTER	The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device. 8 channel differential device with very high sampling rate
OPA333	1.8V, 17uA, 2uV, microPOWER CMOS Zero-Drift Series Operational Amplifier	PRECISION AMPLIFIER - LOW OFFSET VOLTAGE	OPERATIONAL AMPLIFIER
OPA277	High Precision Operational Amplifiers	PRECISION AMPLIFIER - LOW OFFSET VOLTAGE	OPERATIONAL AMPLIFIER
REF5025	Low Noise, Very Low Drift, Precision Voltage Reference	VOLTAGE REFERENCE - SERIES VOLTAGE REFERENCE	SERIES VOLTAGE REFERENCE
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ADS1245 Status: ACTIVE

24-bit Low-Power ADC with High-Z Input Buffer

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