LINEAR dn426f Data Sheet
Summary
The LTC2351-14 is a versatile, low-power 6-channel SAR ADC designed for critical sensing applications. Its 14-bit accuracy and ultra-low power consumption (16.5mW) make it ideal for battery-operated industrial monitoring and portable instrumentation where size and efficiency are paramount. This document details its implementation in real-world scenarios, such as complex three-phase power line monitoring and load characteristic analysis, helping designers optimize solutions with minimal PCB footprint.
Page 1 Text Content
6-Channel SAR ADCs for Industrial Monitoring and Portable Instruments Design Note 426 Guy Hoover and Steve Logan
The 14-bit LTC2351-14 is a 1.5Msps, low power SAR low power and small size are desirable. Power consump- ADC with six simultaneously sampled differential input tion is a mere 16.5m W, which extends battery life. The channels. It operates from a single 3V supply and features 3-wire serial interface means fewer pins than parallel six independent sample-and-hold amplifi ers and a single output devices, allowing the LTC2351-14 to fi t in a 32-pin, ADC. The single ADC with multiple S/HAs enables excellent 5mm × 5mm QFN package.
range match (1m V) between channels and channel-to-
Power Line Monitoring Application
channel skew (200ps).
Figure 1 shows a typical power line monitoring application.
The versatile LTC2351-14 is ideally suited for industrial Current is sensed by a CR Magnetics CR8348-2500-N monitoring applications such as 3-phase power line current transformer. An LT1790-1.25 biases the output monitoring to ensure line voltage compliance, portable of the transformer to the middle of the LTC2351-14 input power line instrumentation, power factor correction, mo- range, giving the inputs maximum swing. A 6:1 trans- tor control, and data acquisition. These applications may former and 41:1 attenuator scale the line voltage, and the be battery powered, and it is here that the LTC2351-14’s transformer output is similarly biased.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
LT1790-1.25
IN OUT3V 0.1 GND
VCC VDD OVDD
CH0 LTC2351-14
+100Ω VREF
4 TURNS
CR MAGNETICS 100Ω
CR8348-2500-N
2k MUX 14-BIT ADC
SCK SDO
+49.9Ω TO
120VAC
47p F 47p F PROCESSOR
LINE S&H
CHANNELS 2-5 TO MEASURE TWO OTHER VI PAIRS DN426 F01
Figure 1. Typical Power Line Monitoring Application
Page Summary Contents For LINEAR dn426f Data Sheet
Manual Details
| Brand | Linear |
|---|---|
| Pages | 2 |
| File Size | 109.06 KB |
| Published | June 19, 2026 |
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Frequently Asked Questions
How does the LTC2351-14 conserve power?
It features a single ADC with multiple S/HAs and operates from a single 3V supply, consuming only 16.5mW.
Is the LTC2351-14 suitable for monitoring different loads?
Yes, it can analyze current through various loads like incandescent bulbs, fluorescent lamps, and LEDs.
What kind of interfaces does the LTC2351-14 use?
It features a 3-wire serial interface, meaning it requires fewer pins than parallel output devices.
Can this device handle power line monitoring?
Yes, it is ideally suited for industrial applications such as 3-phase power line and current monitoring.