LINEAR LTC2446 LTC2447 Data Sheet User Manual
Summary
These 24-bit, high-speed $\Delta\Sigma$ Analog-to-Digital Converters are designed for sophisticated multiple ratiometric measurement systems. Featuring up to eight channels and five selectable differential reference inputs, they precisely digitize diverse sensors (such as RTDs, bridges, and thermocouples) with exceptional low noise and variable speed control. This comprehensive manual details the electrical characteristics, pinout, and optimal application methods necessary for builders of weight scales, gas chromatographs, and advanced instrumentation requiring high accuracy up to 8kHz.
Page 1 Text Content
查询LTC2445IUHF供应商
LTC2446/LTC2447 24-Bit High Speed 8-Channel ∆Σ ADCs with
Selectable Multiple Reference Inputs
FEATURES DESCRIPTIO
Five Selectable Differential Reference Inputs The LTC®2446/LTC2447 4-terminal switching enables
Four Differential/Eight Single-Ended Inputs multiplexed ratiometric measurements. Four sets of se- 4-Way MUX for Multiple Ratiometric lectable differential inputs coupled with four sets of differ- Measurements ential reference inputs allow multiple RTDs, bridges and Up to 8k Hz Output Rate
other sensors to be digitized by a single converter. A fifth
Up to 4k Hz Multiplexing Rate
differential reference input can be selected for any input
Selectable Speed/Resolution:
channel not requiring ratiometric measurements (ther-
2µVRMS Noise at 1.76k Hz Output Rate
mocouples, voltages, current sense, etc.). The flexible
200n VRMS Noise at 13.8Hz Output Rate with
input multiplexer allows single-ended or differential in-
Simultaneous 50/60Hz Rejection
puts coupled with a slaved reference input or a universal
Guaranteed Modulator Stability and Lock-Up
reference input.
Immunity for any Input and Reference Conditions 0.0005% INL, No Missing Codes
A proprietary delta-sigma architecture results in absolute
Autosleep Enables 20µA Operation at 6.9Hz
accuracy (offset, full-scale, linearity) of 15ppm, noise as
<5µV Offset (4.5V < VCC < 5.5V, –40°C to 85°C)
low as 200n VRMS and speeds as high as 8k Hz. Through a
Differential Input and Differential Reference with
RM NO IS (µ V) simple 4-wire interface, ten speed/resolution combina-
GND to VCC Common Mode Range
tions can be selected. The first conversion following a
No Latency Mode, Each Conversion is Accurate Even
speed, resolution, channel change or reference change is
After a New Channel is Selected
valid since there is no settling time between conversions,
Internal Oscillator—No External Components
LTC2447 Includes MUXOUT/ADCIN for External enabling scan rates of up to 4k Hz. Additionally, a 2x mode Buffering or Gain can be selected for any speed-enabling output rates up to Tiny QFN 5mm x 7mm Package 8k Hz with one cycle of latency. , LTC and LT are registered trademarks of Linear Technology Corporation. APPLICATIO S Protected by U.S. Patents, including 6140950, 6169506, 6208279, 6411242, 6639526
Flow Weight Scales Pressure Direct Temperature Measurement Gas Chromatography
TYPICAL APPLICATIO LTC2446 Speed vs RMS Noise Multiple Ratiometric Measurement System VCC = 5V
VREF = 5V + = VIN – = 0V VIN VCC LTC2446 2x SPEED MODE NO LATENCY MODE
2.8µV AT 880Hz
280n V AT 6.9Hz
19-INPUT VARIABLE SPEED/ SDI
(50/60Hz REJECTION)
4-OUTPUT RESOLUTION 24-BIT
MUX IN– ∆Σ ADC SDO
CONVERSION RATE (Hz)
24467 TA01
24467 TA02
24467fa
Page Summary Contents For LINEAR LTC2446 LTC2447 Data Sheet User Manual
Manual Details
| Brand | Linear |
|---|---|
| Pages | 28 |
| File Size | 285.66 KB |
| Published | June 18, 2026 |
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Frequently Asked Questions
What is the maximum number of inputs I can measure?
The device supports up to eight differential or sixteen single-ended inputs for multiplexed ratiometric measurements.
Does measurement accuracy drop after changing channels or reference inputs?
No, there is no settling time between conversions; each conversion remains accurate immediately after a channel or reference change.
What are the measured noise levels and maximum rate?
The ADC features high precision with ultra-low noise, such as 2µV at 1.76kHz or 200nV at 13.8Hz. It can output rates up to 8kHz.
How do I determine the correct operating temperature range for my model?
Industrial versions ('I' suffix) operate from –40°C to 85°C, while commercial versions ('C' suffix) function between 0°C and 70°C.