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Intersil Corporation - Sigma Delta A/D Converter

Numéro de référence HI7190
Description Sigma Delta A/D Converter
Fabricant Intersil Corporation 
Logo Intersil Corporation 





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HI7190 fiche technique
Semiconductor
HI7190
March 1998
24-Bit, High Precision,
Sigma Delta A/D Converter
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
Applications
• Process Control and Measurement
• Industrial Weight Scales
• Part Counting Scales
• Laboratory Instrumentation
• Seismic Monitoring
• Magnetic Field Monitoring
• Additional Reference Literature
- TB348 “HI7190/1 Negative Full Scale Error vs
Conversion Frequency”
- AN9504 “A Brief Intro to Sigma Delta Conversion”
- TB329 “Harris Sigma Delta Calibration Technique”
- AN9505 “Using the HI7190 Evaluation Kit”
- TB331 “Using the HI7190 Serial Interface”
- AN9527 “Interfacing HI7190 to a Microcontroller”
- AN9532 “Using HI7190 in a Multiplexed System”
- AN9601 “Using HI7190 with a Single +5V Supply”
Description
The Harris HI7190 is a monolithic instrumentation, sigma delta
A/D converter which operates from ±5V supplies. Both the sig-
nal and reference inputs are fully differential for maximum flexi-
bility 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 remov-
ing offset and gain errors existing in external and internal cir-
cuitry. 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 so all
discussion will refer to the HI7190 for simplicity.
The HI7190 contains a serial I/O port and is compatible with
most synchronous transfer formats including both the Motor-
ola 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.
Ordering Information
TEMP.
PART NUMBER RANGE (oC)
PACKAGE
HI7190IP
-40 to 85 20 Ld PDIP
HI7190IB
-40 to 85 20 Ld SOIC
HI7190EVAL
Evaluation Kit
PKG.
NO.
E20.3
M20.3
Pinout
HI7190
(PDIP, SOIC)
TOP VIEW
SCLK 1
SDO 2
SDIO 3
CS 4
DRDY 5
DGND 6
AVSS 7
VRLO 8
VRHI 9
VCM 10
20 MODE
19 SYNC
18 RESET
17 OSC1
16 OSC2
15 DVDD
14 AGND
13 AVDD
12 VINHI
11 VINLO
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright © Harris Corporation 1998
1871
File Number 3612.5

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