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ISL267440

Obsolete

10-Bit 1MSPS SAR ADCs

Features

  • Drop-in Compatible with AD7440, AD7450A
  • Differential Input
  • Simple SPI-compatible Serial Digital Interface
  • Guaranteed No Missing Codes
  • 1MHz Sampling Rate
  • 3V or 5V Operation
  • Low Operating Current
  • 1.25mA at 1MSPS with 3V Supplies
  • 1.70mA at 1MSPS with 5V Supplies
  • Power-down Current between Conversions: 1µA
  • Excellent Differential Non-Linearity
  • Low THD: -83dB (typ)
  • Pb-Free (RoHS Compliant)
  • Available in MSOP Package
ISL267440_ISL267450A Functional Diagram
ISL267440_ISL267450A Functional Diagram

Description

The ISL267440 and ISL267450A are 10-bit and 12-bit, 1MSPS sampling SAR-type ADCs featuring excellent linearity over supply and temperature variations. These devices are drop-in compatible with the AD7440 and AD7450A. The robust, fully-differential input offers high impedance to minimize errors due to leakage currents, and the specified measurement accuracy is maintained with input signals up to the supply rails. The reference accepts inputs from 0. 1V to 2. 2V for 3V operation and 0. 1V to 3. 5V for 5V operation. This provides design flexibility in a wide variety of applications. The ISL267440, ISL267450A also feature up to 8kV Human Body Model ESD survivability. The serial digital interface is SPI compatible and is easily interfaced to popular FPGAs and microcontrollers. Power dissipation is 8. 5mW at a sampling rate of 1MSPS, and just 5µW between conversions utilizing Auto Power-Down mode (with a 5V supply). The ISL267440, ISL267450A are excellent solutions for remote industrial sensors and battery-powered instruments. The ISL267440, ISL267450A are available in an 8 lead MSOP package, and are specified for operation over the Industrial temperature range (–40°C to +85°C).

Applications

  • Remote Data Acquisition
  • Battery Operated Systems
  • Industrial Process Control
  • Energy Measurement
  • Data Acquisition Systems
  • Pressure Sensors
  • Flow Controllers
Part NumberStatusSamplesStockRoHSPackageLead Count (#)Carrier TypeMoisture Sensitivity Level (MSL)Pkg. Dimensions (mm)Pb (Lead) FreePb Free CategoryTemp. Range (°C)
ISL267440IHZ-TObsoleteN/AOut of StockRoHS:EN
SOT238#Reel11.6 x 2.9 x 1.10YesNickel/Palladium/Gold-e4-40 to +85°C
ISL267440IHZ-T7AObsoleteN/AIn StockRoHS:EN
SOT238#Reel11.6 x 2.9 x 1.10YesNickel/Palladium/Gold-e4-40 to +85°C
ISL267440IUZObsoleteN/AIn StockRoHS:EN
MSOP8#Tube13.0 x 3.0 x 0.00YesPb-Free 100% Matte Tin Plate w/Anneal-e3-40 to +85°C
ISL267440IUZ-TObsoleteN/AOut of StockRoHS:EN
MSOP8#Reel13.0 x 3.0 x 0.00YesPb-Free 100% Matte Tin Plate w/Anneal-e3-40 to +85°C
ISL267440IUZ-T7AObsoleteN/AOut of StockRoHS:EN
MSOP8#Reel13.0 x 3.0 x 0.00YesPb-Free 100% Matte Tin Plate w/Anneal-e3-40 to +85°C
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    Recommended Documents (1)

  1. Datasheet
    ISL267440, ISL267450A Datasheet
    RECOMMENDED
    PDF 1.13 MB isl267440-450a Oct 12, 2010

    Datasheets (1)

  1. Datasheet
    ISL267440, ISL267450A Datasheet
    RECOMMENDED
    PDF 1.13 MB isl267440-450a Oct 12, 2010

    Application Notes & White Papers (4)

  1. Application Note
    AN535: Design Considerations for a Data Acquisition System (DAS)
    PDF 843 KB an535 Jun 05, 2002
    AI-generated Summary: A Data Acquisition System (DAS) requires careful design of signal conditioning, transducer selection, and signal transmission to ensure high accuracy. Signal conditioning includes multiplexing, amplification, filtering, and calibration, ideally performed near the transducer. Transducers convert physical variables to electrical signals, often voltage, with low source resistance preferred. Signal paths can be single-ended or differential; differential paths better reject common mode noise, especially for low-level signals. Shielded twisted pairs and balanced lines reduce interference. Filters, typically Butterworth low-pass, prevent aliasing and maintain signal integrity.
  2. Application Note
    AN9675: A Tutorial in Coherent and Windowed Sampling with A/D Converters
    PDF 503 KB an9675 Aug 13, 1999
    AI-generated Summary: Effective Number of Bits (ENOB) depends critically on precise coherence in A/D sampling, with small frequency shifts significantly impacting accuracy. Unwrapping reconstructs coherently sampled sine waves, while windowing controls spectral leakage by shaping the acquisition window. Resampling and interpolation adjust sample sets to avoid leakage in FFT analysis. Different window functions balance side lobe levels and bandwidth, affecting spectral resolution and leakage reduction.
  3. Application Note
    AN002: Principles of Data Acquisition and Conversion
    PDF 1.08 MB an002 Nov 19, 1998
    AI-generated Summary: Data acquisition and conversion involve quantization, where the smallest resolvable analog difference (quantum) depends on the full scale range and resolution. Quantization introduces an irreducible error called quantizing error or noise. Aperture time, the conversion time uncertainty, causes amplitude errors when signals change during conversion. Sample-hold circuits reduce aperture time by storing sampled signals. The Sampling Theorem states that sampling frequency must be at least twice the highest signal frequency to avoid distortion from frequency folding or aliasing. Natural binary code is commonly used for digital representation in converters, with the most and least significant bits defining the code's resolution and value.
  4. Application Note
    AN9705: A Theoretical View of Coherent Sampling
    PDF 287 KB an9705 Feb 21, 1997
    AI-generated Summary: Coherent sampling requires the ratio of signal frequency to sampling frequency to be a rational number, expressed as ko/N. When this condition is not met, frequency smearing occurs across bins. Data Acquisition Systems (DAS) can mitigate this by windowing, fixing sampling frequency and tuning input frequency, or fixing input frequency and tuning sampling frequency. The latter two methods are practical for most systems. Pseudo-code illustrates the frequency response for non-integer ko values.

    Product Notices (PCN, EOL, etc) (3)

  1. Product Advisory
    PA22026 - MSL1 Packing Change for listed Renesas Products
    PDF 414 KB Aug 26, 2022
  2. Price Increase Notice
    PIN19028 - Q3 Cy 19 Price Increase Notice
    PDF 208 KB PIN19028 Aug 30, 2019
  3. Product Change Notice
    PCN11059 - Shipping Tube Change for Intersil MSOP Packaged Products
    PDF 117 KB PCN11059 Jun 17, 2011

    Marketing Collateral (1)

  1. Brochure
    Analog ICs Brochure
    PDF 5.43 MB R07CL0009EJ0800 Rev.8.00 日本語 Nov 10, 2025
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