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