LTD226X Series
High-precision, Multi-channel, 40-kSPS, 24-bit, Delta-sigma ADCs
P-
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Linearin and designs are registered trademarks of Linearin Technology Corporation.
©
Copyright Linearin Technology Corporation. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
FN1623-43.0 — Data Sheet
1. General Description
The LTD226X family are high-precision, multi-channel, 40-kSPS, delta-sigma (Δ-Σ)
analog-to-digital converters (ADCs). Features, for example, programmable gain amplifier
(PGA), precise and low-drift voltage reference, monitors for fault detection, general purpose
input output options are included in this highly-integrated chip making it a single-chip solution
to deal with measurements tasks such as weigh scales, resistance temperature detectors
(RTDs) and thermalcouple sensors.
The main path of analog-to-digital conversion consists of an input multiplexer (5 channels for
LTD2260 and 10 channels for LTD2261), a low-noise PGA, a 24-bit Δ-Σ modulator, a precise and
low-drift voltage reference, and a programmable digital filter. The 1 GΩ high input impedance
of the PGA minimizes the error induced by sensor loading. The device provide two individual
current source with programmable supplying current, that simplifies the circuit of RTDs
measurements.
The conversion is completed by a fourth-order Δ-Σ modulator combined with a flexible digital
filter. The filter supports a simultaneous 50-Hz and 60-Hz rejection mode and single-cycle
settling mode. Associated with internal signal and reference monitors, a temperature sensor
and CRC data verification, the output data is more reliable.
The LTD226X family are available in 5 mm × 5 mm QFN packages and specified in temperature
range from -40℃ to 125℃.
2. Features and Benefits
High-precision, 24-bit delta-sigma ADC
Low noise: 30 nVRMS (@20 SPS, gain=128)
Linearity: 2 ppm
5 single-ended inputs or 3 differential inputs (LTD2260)
10 single-ended inputs or 5 differential inputs (LTD2261)
PGA gain: 1 to 128
Input voltage range: ±7 mV to ±5 V
Data rate: 2.5 SPS to 40 kSPS
Low drift 2.5 V reference: 2 ppm/℃
Simultaneous 50-Hz and 60-Hz rejection mode
Single-cycle settling mode
PGA voltages and reference monitors
5 V or ±2.5 V supply
Integrated temperature sensor
Cyclic redundancy check
Two individual current source
Sensor burn-out detection
4 GPIOs available
AC excitation for bridge sensors
LTD226X Series
High-precision, Multi-channel, 40-kSPS, 24-bit, Delta-sigma ADCs
P-
2
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Linearin and designs are registered trademarks of Linearin Technology Corporation.
©
Copyright Linearin Technology Corporation. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
FN1623-43.0 — Data Sheet
SPI compatible
3. Applications
Temperature and pressure measurement
Analog input modules in PLC and DCS
Weigh scales and strain-gauge digitizers
Scientific and lab instruments
4. Pin Configuration (Top View)
Table of Contents
1. General Description ............................................................. 1
2. Features and Benefits ........................................................ 1
3. Applications ...........................................................................2
4. Pin Configuration (Top View)...........................................2
5. Revision History ...................................................................2
6. Device Comparison .............................................................3
7. Pin Description .....................................................................3
8. Functional Block Diagram ................................................4
9. Ordering Information......................................................... 4
10. Specifications ......................................................................4
10.1. Limiting Value ..........................................................4
10.2. ESD Ratings .............................................................4
10.3. Recommended Operating Conditions .............5
10.4. Electrical Characteristics ...................................5
10.5. Timing Requirements ........................................... 7
10.6. Switching Characteristics .................................. 8
1.1.1. RESET IC ..................... 错误！未定义书签。
6. Revision History
Version 0
FN1623-41.0 — Data Sheet