HI7191: 24-Bit, High Precision, Sigma Delta A/D Converter

The Intersil HI7191 is a monolithic instrumentation, sigma delta A/D converter which operates from ±5V supplies. Both the signal and reference inputs are fully differential for maximum flexibility and performance. An internal Programmable Gain Instrumentation Amplifier (PGIA) provides input gains from 1 to 128 eliminating the need for external pre-amplifiers. The on-demand converter auto-calibrate function is capable of removing offset and gain errors existing in external and internal circuitry. The on-board user programmable digital filter provides over 120dB of 60/50Hz noise rejection and allows fine tuning of resolution and conversion speed over a wide dynamic range. The HI7190 and HI7191 are functionally the same device, but the HI7190 has tighter linearity specs.

The HI7191 contains a serial I/O port and is compatible with most synchronous transfer formats including both the Motorola 6805/11 series SPI and Intel 8051 series SSR protocols. A sophisticated set of commands gives the user control over calibration, PGIA gain, device selection, standby mode, and several other features. The On-chip Calibration Registers allow the user to read and write calibration data.

Key Features
  • 20-Bit Resolution with No Missing Code
  • 0.0015% Integral Non-Linearity (Typ)
  • 20mV to ±2.5V Full Scale Input Ranges
  • Internal PGIA with Gains of 1 to 128
  • Serial Data I/O Interface, SPI Compatible
  • Differential Analog and Reference Inputs
  • Internal or System Calibration
  • 120dB Rejection of 60/50Hz Line Noise
  • Settling Time of 4 Conversions (Max) for a Step Input
  • Pb-Free Plus Anneal Available (RoHS Compliant)
Applications
  • Process Control and Measurement
  • Industrial Weight Scales
  • Part Counting Scales
  • Laboratory Instrumentation
  • Seismic Monitoring
  • Magnetic Field Monitoring
Typical Diagram
Application Notes
TitleTypeUpdatedSizeOther Languages
AN9705: A Theoretical View of Coherent SamplingPDF13 Nov 201425 KB
AN9675: Coherent and Windowed Sampling with A/D ConvertersPDF13 Nov 2014160 KB
AN9601: Using the HI7190 with Single +5V SupplyPDF13 Nov 201428 KB
AN9532: Using the HI-0539 in a Multiplexed A/D SystemPDF13 Nov 2014122 KB
AN9527: Interfacing the HI7190 to a MicrocontrollerPDF13 Nov 201445 KB
AN9510: Basic Analog for Digital DesignersPDF13 Nov 2014285 KB
AN9504: A Brief Introduction to Sigma Delta ConversionPDF13 Nov 201485 KB
AN002: Principles of Data Acquisition and ConversionPDF13 Nov 2014257 KB
Datasheets
TitleTypeUpdatedSizeOther Languages
HI7191 DatasheetPDF14 Nov 2014624 KB
Tech Briefs
TitleTypeUpdatedSizeOther Languages
TB348: HI7190, HI7191 Negative Full Scale Error Versus Conversion FrequencyPDF19 Nov 201447 KB
TB331: Using the HI7190 Serial InterfacePDF19 Nov 201428 KB
TB329: Harris Sigma-Delta Calibration Technique (related to HI7190)PDF19 Nov 201430 KB
User Guides
TitleTypeUpdatedSizeOther Languages
HI7190EVAL User GuidePDF13 Nov 201496 KB
Order Information
Part NumberPackage TypeWeight(g)PinsMSL RatingPeak Temp (°C)RoHS Status
HI7191IB20 Ld SOIC0.5201240
HI7191IBZ20 Ld SOIC0.5203260RoHS
HI7191IBZ-T20 Ld SOIC T+R0.5203260RoHS
HI7191IP20 Ld PDIP1.520N/ANA
HI7191IPZ20 Ld PDIP1.520N/ANARoHS
HI7191 Datasheet 14 Nov 2014
20 Ld SOIC ISL8394
20 Ld PDIP ISL83204A
HI7191
AN9705: A Theoretical View of Coherent Sampling 13 Nov 2014
AN9675: Coherent and Windowed Sampling with A/D Converters 13 Nov 2014
AN9601: Using the HI7190 with Single +5V Supply 13 Nov 2014
AN9532: Using the HI-0539 in a Multiplexed A/D System 13 Nov 2014
AN9527: Interfacing the HI7190 to a Microcontroller 13 Nov 2014
AN9510: Basic Analog for Digital Designers 13 Nov 2014
AN9504: A Brief Introduction to Sigma Delta Conversion 13 Nov 2014
AN002: Principles of Data Acquisition and Conversion 13 Nov 2014
TB348: HI7190, HI7191 Negative Full Scale Error Versus Conversion Frequency 19 Nov 2014
TB331: Using the HI7190 Serial Interface 19 Nov 2014
TB329: Harris Sigma-Delta Calibration Technique (related to HI7190) 19 Nov 2014
HI7190EVAL User Guide 13 Nov 2014