HI7190 В® Data Sheet June 27, 2006 24-Bit, High Precision, Sigma Delta A/D
Converter
The Intersil HI7190 is a monolithic instrumentation, sigma
delta A/D converter which operates from В±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. FN3612.10 Features 22-Bit Resolution with No Missing Code 0.0007% Integral Non-Linearity (Typ) 20mV to В±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 Pinout
HI7190 …