HI7190_06 Datasheet, PDF (1/25 Pages) Intersil Corporation – 24-Bit, High Precision, Sigma Delta A/D Converter

®
Data Sheet
June 27, 2006
HI7190
FN3612.10
24-Bit, High Precision, Sigma Delta A/D
Converter
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 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 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.
Pinout
HI7190
20 LD SOIC, PDIP
TOP VIEW
SCLK 1
SDO 2
SDIO 3
CS 4
DRDY 5
DGND 6
AV_SS 7
V_RLO 8
V_RHI 9
V_CM 10
20 MODE
19 SYNC
18 RESET
17 OSC₁
16 OSC₂
15 DV_DD
14 AGND
13 AV_DD
12 V_INHI
11 V_INLO
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)
Applications
• Process Control and Measurement
• Industrial Weight Scales
• Part Counting Scales
• Laboratory Instrumentation
• Seismic Monitoring
• Magnetic Field Monitoring
• Additional Reference Literature
- Technical Brief, TB348 “HI7190/1 Negative Full Scale
Error vs Conversion Frequency”
- Application Note, AN9504 “A Brief Intro to Sigma Delta
Conversion”
- Technical Brief, TB329 “Intersil Sigma Delta Calibration
Technique”
- Application Note, AN9505 “Using the HI7190 Evaluation
Kit”
- Technical Brief, TB331 “Using the HI7190 Serial
Interface”
- Application Note, AN9527 “Interfacing HI7190 to a
Microcontroller”
- Application Note, AN9532 “Using HI7190 in a
Multiplexed System”
- Application Note, AN9601 “Using HI7190 with a Single
+5V Supply”
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CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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