HI7190

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

Product Status: Mass Production(*)

OVERVIEW

The Intersil HI7190 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 autocalibrate 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 specifications.

The HI7190 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

  • 22-Bit Resolution with No Missing Code
  • 0.0007% 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)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
HI7190
Basic Information
Production Status
Mass Production(*)
# of Devices/ Channels
1
Resolution Bits
24
Max Conversion Rate (kSPS)
2
INL (%FS)
0.005
Power Consumption (mW)
15
Analog Supply Voltage Min (V)
-5
Analog Supply Voltage Max (V)
5
Digital Supply Voltage Min (V)
-5 V
Digital Supply Voltage Max (V)
5 V
Qualification Level
Standard
Digital Supply Voltage V
±5
Analog Supply Voltage V
±5
Can Sample
YES
Temperature Range
-40 to +85

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