ADS1256 Status: ACTIVE

24 Bit, 30kSPS Very Low Noise Delta-Sigma ADC with Multiplexer

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Datasheet

Very Low Noise, 24-Bit Analog-to-Digital Converter (Rev. J) (ads1256.pdf, 570 KB)
08 Aug 2008 Download

	ADS1216	ADS1217	ADS1218	ADS1240	ADS1241	ADS1242	ADS1243	ADS1248	ADS1250	ADS1251	ADS1252	ADS1253	ADS1254	ADS1255	ADS1256	ADS1258
Resolution(Bits)	24	24	24	24	24	24	24	24	20	24	24	24	24	24	24	24
Sample Rate (max)	780SPS	780SPS	780SPS	15SPS	15SPS	15SPS	15SPS	2KSPS	25kSPS	20kSPS	41kSPS	20kSPS	20kSPS	30kSPS	30kSPS	125kSPS
Architecture	Delta-Sigma	Delta-Sigma	Delta-Sigma	Delta-Sigma	Delta-Sigma	Delta-Sigma	Delta-Sigma		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	75	7.5	40	7.5	4.36	36	36	42
DNL(Max)(+/-LSB)	1	1	1	1	1	1	1		1	1	1	1	1	2	2	1
INL(Max)(+/-LSB)	0.0015%	0.0015%	0.0015%	0.0015%	0.0015%	0.0015%	0.0015%		0.0012%	0.0002%	0.0003%	0.0002%	0.0002%	0.0003%	0.0003%	0.0003%
No Missing Codes(Bits)	24	24	24	24	24	24	24	24	20	24	24	24	24	24	24	24
ENOB(Bits)														23	23
No. of Supplies	2	2	2	2	2	1	1	3	1	1	1	1	2	2	2	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	4.75	4.75	4.75	4.75	4.75	4.75	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	5.25	5.25	5.25	5.25	5.25	5.25	5.25
Logic Voltage DV/DD(Min)(V)	2.7	2.7	2.7	2.7	2.7	2.7	2.7	2.5	4.75	4.75	4.75	4.75	1.8	1.8	1.8	2.5
Logic Voltage DV/DD(Max)(V)	5.25	5.25	5.25	5.25	5.25	5.25	5.25	5.8	5.25	5.25	5.25	5.25	3.6	3.6	3.6	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	Vref/PGA (1-8)	Vref	Vref	Vref	Vref	2Vref/PGA(1-64)	2Vref/PGA(1-64	1.06Vref
Reference Mode	Int	Int	Int	Ext	Ext	Ext	Ext	Int/Ext	Ext	Ext	Ext	Ext	Ext	Ext	Ext	Ext
Rating	Catalog	Catalog	Catalog	Catalog	Catalog	Catalog	Catalog	Catalog	Catalog	Catalog	Catalog	Catalog	Catalog	Catalog	Catalog	Catalog
Pin/Package	48TQFP	48TQFP	48TQFP	24SSOP	28SSOP	16TSSOP	20TSSOP	28TSSOP	16SOIC	8SOIC	8SOIC	16SSOP/QSOP	20SSOP/QSOP	20SSOP	28SSOP	48QFN
# Input Channels	8	8	8	4	8	4	8	7	1	1	1	4	4	2	8	16
	Samples	Samples	Samples	Samples	Samples	Samples	Samples	Samples	Samples	Samples	Samples	Samples	Samples	Samples	Samples	Samples
	Inventory	Inventory	Inventory	Inventory	Inventory	Inventory	Inventory	Inventory Not Available	Inventory	Inventory	Inventory	Inventory	Inventory	Inventory	Inventory	Inventory

Customers Who Evaluated This Product Also Evaluated

ADS1258: 24 Bit, Fast Channel Cycling Delta-Sigma ADC
ADS8361: 16-Bit 500 kSPS 2 ADCs, 4ch, serial out
ADS1254: 24-Bit, 20kHz, Low Power Analog-to-Digital Converter
TS5A23157: Dual 10-Ohm SPDT Analog Switch
OPA547: High-Voltage, High-Current Op Amp, Excellent Output Swing
SN74HC08: Quadruple 2-Input Positive-AND Gates

More Related Products

Product Information

Features

24 Bits, No Missing Codes
- All Data Rates and PGA Settings
Up to 23 Bits Noise-Free Resolution
±0.0010% Nonlinearity (max)
Data Output Rates to 30kSPS
Fast Channel Cycling
- 18.6 Bits Noise-Free (21.3 Effective Bits) at 1.45kHz
One-Shot Conversions with Single-Cycle Settling
Flexible Input Multiplexer with Sensor Detect
- Four Differential Inputs (ADS1256 only)
- Eight Single-Ended Inputs (ADS1256 only)
Chopper-Stabilized Input Buffer
Low-Noise PGA: 27nV Input-Referred Noise
Self and System Calibration for All PGA Settings
5V Tolerant SPI™-Compatible Serial Interface
Analog Supply: 5V
Digital Supply: 1.8V to 3.6V
Power Dissipation
- As Low as 38mW in Normal Mode
- 0.4mW in Standby Mode
APPLICATIONS
- Scientific Instrumentation
- Industrial Process Control
- Medical Equipment
- Test and Measurement
- Weigh Scales

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

Description

The ADS1255 and ADS1256 are extremely low-noise, 24-bit analog-to-digital (A/D) converters. They provide complete high-resolution measurement solutions for the most demanding applications.

The converter is comprised of a 4th-order, delta-sigma (ΔΣ) modulator followed by a programmable digital filter. A flexible input multiplexer handles differential or single-ended signals and includes circuitry to verify the integrity of the external sensor connected to the inputs. The selectable input buffer greatly increases the input impedance and the low-noise programmable gain amplifier (PGA) provides gains from 1 to 64 in binary steps. The programmable filter allows the user to optimize between resolution of up to 23 bits noise-free and data rate of up to 30k samples per second (SPS). The converters offer fast channel cycling for measuring multiplexed inputs and can also perform one-shot conversions that settle in just a single cycle.

Communication is handled over an SPI-compatible serial interface that can operate with a 2-wire connection. Onboard calibration supports both self and system correction of offset and gain errors for all the PGA settings. Bidirectional digital I/Os and a programmable clock output driver are provided for general use. The ADS1255 is packaged in an SSOP-20, and the ADS1256 in an SSOP-28.

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
ADS1256IDBR	ACTIVE	-40 to 85	9.30 \| 100u	SSOP (DB) \| 28	View	1000 \| LARGE T&R	Purchase Samples
ADS1256IDBRG4	ACTIVE	-40 to 85	9.30 \| 100u	SSOP (DB) \| 28	View	1000 \| LARGE T&R	Purchase Samples
ADS1256IDBT	ACTIVE	-40 to 85	10.25 \| 100u	SSOP (DB) \| 28	View	250 \| SMALL T&R
ADS1256IDBTG4	ACTIVE	-40 to 85	10.25 \| 100u	SSOP (DB) \| 28	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
ADS1256IDBR	As of 9:18 AM GMT, 05 Oct 2008			As of 9:18 AM GMT, 05 Oct 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	0*	>10k \| 29 Dec	16 Weeks	None Reported View Distributors
ADS1256IDBRG4	As of 9:18 AM GMT, 05 Oct 2008			As of 9:18 AM GMT, 05 Oct 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	0*	>10k \| 29 Dec	16 Weeks	None Reported View Distributors
ADS1256IDBT	As of 9:18 AM GMT, 05 Oct 2008			As of 9:18 AM GMT, 05 Oct 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	0*	>10k \| 29 Dec	16 Weeks	None Reported View Distributors
ADS1256IDBTG4	As of 9:18 AM GMT, 05 Oct 2008			As of 9:18 AM GMT, 05 Oct 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	0*	>10k \| 29 Dec	16 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
ADS1256IDBR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
ADS1256IDBRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
ADS1256IDBT	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
ADS1256IDBTG4	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

Very Low Noise, 24-Bit Analog-to-Digital Converter (Rev. J) (ads1256.pdf, 570 KB)
08 Aug 2008 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
Using Ceramic Resonators with the ADS1255/6 (sbaa104.htm, 8 KB)
09 Jul 2004 Abstract
Shelf-Life Evaluation of Lead-Free Component Finishes (szza046.htm, 8 KB)
24 May 2004 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

ADS1256EVM Evaluation Module User's Guide (Rev. B) (sbau090b.htm, 8 KB)
30 Sep 2008 Abstract

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
ADS1256 Evaluation Module	ADS1256EVM	Texas Instruments	Development Boards/EVMs
DCPFREETOOL Software Plug-In to Code Composer Studio	DCPFREETOOL	Texas Instruments	Utilities/Plug-Ins

Alternative Products - Are similar to ADS1256
Part #	Name	Comments
ADS1274	Quad, 128kHz, Simultaneous Sampling 24-Bit Delta Sigma ADC	Similar device with excellent AC performance in addition to the DC performance
ADS1278	Octal, 128kHz, Simultaneous Sampling 24-Bit Delta Sigma ADC	8 channel device with excellent AC performance in addition to the DC performance
ADS1258	24 Bit, Fast Channel Cycling Delta-Sigma ADC	8 channel version of ADS1256
ADS1255	24 Bit, 30kSPS Very Low Noise Delta-Sigma ADC	Single channel version of ADS1256
Customers Who Evaluated This Product Also Evaluated...
ADS1258	24 Bit, Fast Channel Cycling Delta-Sigma ADC	TI customers also evaluated this product.
ADS8361	16-Bit 500 kSPS 2 ADCs, 4ch, serial out	TI customers also evaluated this product.
ADS1254	24-Bit, 20kHz, Low Power Analog-to-Digital Converter	TI customers also evaluated this product.
ADS1255	24 Bit, 30kSPS Very Low Noise Delta-Sigma ADC	TI customers also evaluated this product.
ADS1278	Octal, 128kHz, Simultaneous Sampling 24-Bit Delta Sigma ADC	TI customers also evaluated this product.
ADS1274	Quad, 128kHz, Simultaneous Sampling 24-Bit Delta Sigma ADC	TI customers also evaluated this product.
ADS1232	24-Bit, Ultra Low-Noise Analog-to-Digital Converter	TI customers also evaluated this product.
ADS1281	High Resolution 24-Bit Analog-to Digital Converter	TI customers also evaluated this product.
ADS1252	ResolutionPlus 24-Bit, 40kHz Analog-to-Digital Converter	TI customers also evaluated this product.
ADS1253	24-Bit, 20kHz, Low Power Analog-to-Digital Converter	TI customers also evaluated this product.

Complementary Products - Can be used with ADS1256
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 OFFSET VOLTAGE	OPERATIONAL AMPLIFIER
Customers Who Evaluated This Product Also Evaluated...
TS5A23157	Dual 10-Ohm SPDT Analog Switch	SWITCHES AND MULTIPLEXERS-ANALOG SWITCHES/MULTIPLEXERS (less than or equal to 5V)	TI customers also evaluated this product.
OPA547	High-Voltage, High-Current Op Amp, Excellent Output Swing	PRECISION AMPLIFIERS-HIGH OUTPUT CURRENT	TI customers also evaluated this product.
SN74HC08	Quadruple 2-Input Positive-AND Gates	GATES-AND GATES	TI customers also evaluated this product.
CD74HC4052	High Speed CMOS Differential 4-Channel Analog Multiplexer/Demultiplexer	SIGNAL SWITCHES-ANALOG SWITCHES AND MULTIPLEXERS (less than or equal to 5V)	TI customers also evaluated this product.
TLV431A	Low Voltage Adjustable Precision Shunt Regulator	REFERENCES-SHUNT VOLTAGE REFERENCES	TI customers also evaluated this product.
SN74LVC125A	Quadruple Bus Buffer Gate With 3-State Outputs	BUFFERS, DRIVERS AND TRANSCEIVERS-NON-INVERTING BUFFERS AND DRIVERS	TI customers also evaluated this product.
MAX3221	3-V to 5.5-V Single-Channel RS-232 Line Driver/Receiver	INTERFACE (SL)-RS-232 (SL)	TI customers also evaluated this product.
OPA4227	High Precision, Low Noise Operational Amplifiers	PRECISION AMPLIFIERS-LOW OFFSET VOLTAGE	TI customers also evaluated this product.
SN74LVC1T45	Single-Bit Dual-Supply Bus Transceiver with Configurable Voltage Translation and 3-State Outputs	INTERFACE (SL)-VOLTAGE LEVEL TRANSLATION (SL)	TI customers also evaluated this product.
SN74LVC32A	Quadruple 2-Input Positive-OR Gate	GATES-OR GATES	TI customers also evaluated this product.

ADS1256 Status: ACTIVE

24 Bit, 30kSPS Very Low Noise Delta-Sigma ADC with Multiplexer

See Also

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