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Product Detailed Parameters
- Description：IC ADC 24BIT SIGMA-DELTA 8SOIC
- Series：microPOWER™
- Mfr：Analog Devices Inc.
- Package：Tube
- Number of Bits：24
- Sampling Rate (Per Second)：7.5
- Number of Inputs：1
- Input Type：Single Ended
- Data Interface：SPI
- Configuration：ADC
- Ratio - S/H:ADC：-
- Number of A/D Converters：1
- Architecture：Sigma-Delta
- Reference Type：External
- Voltage - Supply, Analog：2.7V ~ 5.5V
- Voltage - Supply, Digital：2.7V ~ 5.5V
- Features：-
- Operating Temperature：-40°C ~ 85°C
- Package / Case：8-SOIC (0.154", 3.90mm Width)
- Supplier Device Package：8-SO
- Mounting Type：Surface Mount
- Grade：-
- Qualification：-
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Overview
The LTC2400IS8#PBF is a micropower 24-bit delta-sigma analog-to-digital converter (ADC) in an 8-lead SOIC package. It operates on a single supply voltage ranging from 2.7V to 5.5V and features an integrated oscillator requiring no external frequency-setting components. The device provides 4ppm integral nonlinearity (INL), 0.3ppm RMS noise, and a live zero input range of –12.5% VREF to 112.5% VREF. It communicates via a flexible 3-wire digital interface compatible with SPI and MICROWIRE protocols. The industrial temperature grade version supports operation from –40°C to +85°C.
Feature Summary
- 24-bit resolution with 4ppm INL and 0.3ppm RMS noise
- Integrated oscillator providing >110dB rejection at 50Hz or 60Hz
- Extended input range: –0.125 • VREF to 1.125 • VREF
- Single-cycle settling time for multiplexed applications
Applications
- Weight scales
- Direct temperature measurement
- Gas analyzers
- Strain-gage transducers
- Instrumentation and data acquisition
Procurement Notes
Verify the IS8 suffix indicates the industrial temperature range (–40°C to +85°C) and SOIC-8 package. Confirm PBF designation implies lead-free compliance. Check specific distributor availability as stock levels vary.
Selection Notes
Select this component for high-precision applications requiring low noise and extended input ranges. Ensure the reference voltage is between 0.1V and VCC. For 50Hz line rejection, connect FO to VCC; for 60Hz, connect FO to GND. Consider the 160ms conversion time for 50Hz mode when designing timing constraints.
Part Context
This part belongs to the LTC2400 family of No Latency Delta-Sigma ADCs. The IS8 variant specifically denotes the industrial temperature rating and plastic SOIC-8 packaging, distinguishing it from commercial grades or other package options within the same functional series.
Replacement Considerations
Compatible substitutes include the LTC2400CS8#PBF for commercial temperature range applications. Other Analog Devices 24-bit delta-sigma ADCs may serve as alternatives if pin compatibility or specific performance metrics differ.
FAQ
How is the notch frequency selected?
Connect the FO pin to VCC for 50Hz rejection or to GND for 60Hz rejection. An external clock can also drive the FO pin for user-defined frequencies.
What is the input voltage range?
The converter accepts inputs from –0.125 • VREF to 1.125 • VREF, allowing for overrange and underrange conditions without saturation.
Does the device require external calibration?
No, the LTC2400 performs offset and full-scale calibrations automatically every conversion cycle, ensuring stability against temperature and supply variations.
