ADS1255 Status: ACTIVE

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

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Datasheet

Very Low Noise, 24-Bit Analog-to-Digital Converter (Rev. J) (PDF 592 KB) 21182 views
08 Aug 2008

	ADS1250	ADS1251	ADS1252	ADS1253	ADS1254	ADS1255	ADS1258
Resolution(Bits)	20	24	24	24	24	24	24
Sample Rate (max)	25kSPS	20kSPS	41kSPS	20kSPS	20kSPS	30kSPS	125kSPS
Architecture	Delta-Sigma	Delta-Sigma	Delta-Sigma	Delta-Sigma	Delta-Sigma	Delta-Sigma	Delta-Sigma
Power Consumption(Typ)(mW)	75	7.5	40	7.5	4.36	36	42
DNL(Max)(+/-LSB)	1	1	1	1	1	2	1
INL(Max)(+/-LSB)	0.0012%	0.0002%	0.0003%	0.0002%	0.0002%	0.0003%	0.0003%
No Missing Codes(Bits)	20	24	24	24	24	24	24
ENOB(Bits)	18	19	19	19	19	23	21.6
No. of Supplies	1	1	1	1	2	2	2
Analog Voltage AV/DD(Min)(V)	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
Logic Voltage DV/DD(Min)(V)	4.75	4.75	4.75	4.75	1.8	1.8	2.5
Logic Voltage DV/DD(Max)(V)	5.25	5.25	5.25	5.25	3.6	3.6	3.6
Input Configuration Range	Vref/PGA (1-8)	Vref	Vref	Vref	Vref	2Vref/PGA(1-64)	1.06Vref
Reference Mode	Ext	Ext	Ext	Ext	Ext	Ext	Ext
Rating	Catalog	Catalog	Catalog	Catalog	Catalog	Catalog	Catalog
Pin/Package	16SOIC	8SOIC	8SOIC	16SSOP/QSOP	20SSOP/QSOP	20SSOP	48QFN
# Input Channels	1	1	1	4	4	2	16
	Samples	Samples	Samples	Samples	Samples	Samples	Samples
	Inventory	Inventory	Inventory	Inventory	Inventory	Inventory	Inventory

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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
ADS1255IDBR	ACTIVE	-40 to 85	7.00 \| 1ku	SSOP (DB) \| 20	View	1000 \| LARGE T&R	Purchase Samples
ADS1255IDBRG4	ACTIVE	-40 to 85	7.00 \| 1ku	SSOP (DB) \| 20	View	1000 \| LARGE T&R	Purchase Samples
ADS1255IDBT	ACTIVE	-40 to 85	7.65 \| 1ku	SSOP (DB) \| 20	View	250 \| SMALL T&R
ADS1255IDBTG4	ACTIVE	-40 to 85	7.65 \| 1ku	SSOP (DB) \| 20	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
ADS1255IDBR	As of 12:12 PM GMT, 03 Jul 2009	As of 12:12 PM GMT, 03 Jul 2009
	Lead Time	Region	Company	In Stock	Purchase
	14 Weeks	Americas	DigiKey	Available
	14 Weeks	Europe	Compel	232
ADS1255IDBRG4	As of 12:12 PM GMT, 03 Jul 2009	As of 12:12 PM GMT, 03 Jul 2009
	Lead Time	Region	Company	In Stock	Purchase
	14 Weeks	Americas	DigiKey	Available
ADS1255IDBT	As of 12:12 PM GMT, 03 Jul 2009	As of 12:12 PM GMT, 03 Jul 2009
	Lead Time	Region	Company	In Stock	Purchase
	4 Weeks	Americas	Arrow	250
			DigiKey	284
			Mouser Electronics	>1k
			Newark	>1k
		Europe	Avnet-SILICA	214
			Compel	12
			Farnell	544
ADS1255IDBTG4	As of 12:12 PM GMT, 03 Jul 2009	As of 12:12 PM GMT, 03 Jul 2009
	Lead Time	Region	Company	In Stock	Purchase
	4 Weeks	Americas	DigiKey	Available
	4 Weeks	Europe	EBV Elektronik	>1k
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
ADS1255IDBR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
ADS1255IDBRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
ADS1255IDBT	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
ADS1255IDBTG4	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 ADS1255

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

Part #	Name	Product Family	Comments
ADS1271	24-Bit, 105kSPS Industrial Delta-Sigma ADC		Similar device with excellent AC performance in addition to the DC performance
ADS1256	24 Bit, 30kSPS Very Low Noise Delta-Sigma ADC with Multiplexer		4 channel version of ADS1255
ADS1258	24 Bit, Fast Channel Cycling Delta-Sigma ADC		8 channel version of ADS1255
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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