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Analog Devices Inc. LTC2408CG#PBF
- Part No.:
- LTC2408CG#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC2408CG#PBF.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:282
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Product details
Overview
LTC2408CG#PBF from Analog Devices (formerly Linear Technology) is an 8-channel, 24-bit micropower delta-sigma ADC with no-latency digital filtering, 4ppm INL, 0.3ppm RMS noise, and integrated oscillator. It operates from 2.7V to 5.5V, accepts reference voltages from 0.1V to VCC, and delivers valid first-conversion results after channel change-ideal for precision multiplexed sensor data acquisition in industrial instrumentation.
For engineers reviewing the LTC2408CG#PBF datasheet, LTC2408CG#PBF pinout, LTC2408CG#PBF application, or LTC2408CG#PBF equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts with functional distinctions, and supply-chain support for volume deployment in weight scales, gas analyzers, and strain gauge systems.
Technical Context
The LTC2408CG#PBF implements a 24-bit delta-sigma modulator with decimating FIR filter and auto-calibrating architecture that eliminates latency-every conversion result corresponds directly to the selected input channel without settling delay. Its internal oscillator enables 50Hz or 60Hz ±2% notch rejection ≥110dB without external timing components.
It uses a flexible 4-wire serial interface compatible with SPI and MICROWIRE protocols, supports external clocking (2.56–307.2 kHz), and features live-zero extended input range (–12.5% to +112.5% of VREF) to absorb sensor offset and overrange conditions before signal conditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit with no missing codes-guarantees monotonicity and full dynamic range utilization in high-precision measurement. |
| INL | 4 ppm of VREF max-enables 16-bit+ effective linearity without post-calibration in 6½-digit DVMs and analytical instruments. |
| RMS Noise | 0.3 ppm of VREF-translates to ~1.5 µV RMS noise at 5V reference, supporting sub-microvolt signal resolution. |
| Supply Current | 200 µA typical in conversion mode-allows battery-powered operation for >1 year in low-duty-cycle sensor nodes. |
| Input Range | –0.125 × VREF to +1.125 × VREF-accommodates 12.5% underrange/overrange without clipping, simplifying front-end gain staging. |
| Notch Rejection | ≥110 dB at 50 Hz or 60 Hz ±2%-eliminates mains interference in lab-grade measurements without external filters. |
| Reference Range | 0.1 V to VCC-supports low-voltage references (e.g., 1.25 V bandgap) while maintaining full 24-bit resolution capability. |
Pinout & Package
Package: 28-lead plastic SSOP (G package), 5.6 mm × 10.2 mm, 0.635 mm pitch, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1,5,6,16,18,22,27,28) | Ground reference | Multiple dedicated ground pins minimize ground bounce and enable star-point grounding for low-noise analog performance. |
| VCC (Pins 2,8) | Positive supply | Dual supply pins reduce IR drop and improve PSRR; requires local 10 µF tantalum + 0.1 µF ceramic bypassing. |
| VREF (Pin 3) | Reference input | Accepts 0.1 V to VCC; sets full-scale range and noise floor-no external buffer required for stable references. |
| ADCIN (Pin 4) | Analog input node | Connects to MUXOUT; input voltage range extends beyond rail-to-rail to handle system-level offsets. |
| MUXOUT (Pin 7) | Multiplexer output | Drives ADCIN; must be tied directly to Pin 4 for standard operation-no external buffering needed. |
| CH0–CH7 (Pins 9–12,13,14,15,17) | Analog channel inputs | 8 independent single-ended inputs; CH4–CH7 are no-connect on LTC2404 but fully functional on LTC2408CG#PBF. |
| FO (Pin 26) | Filter oscillator control | Selects 50 Hz (FO = VCC), 60 Hz (FO = GND), or user-defined notch (FO = external clock)-configures rejection without firmware. |
| CSADC / CSMUX (Pins 23,20) | Chip select inputs | Separate enables for ADC and MUX allow independent control of conversion start and channel selection timing. |
| SCK / CLK (Pins 25,19) | Serial clock | Shared clock path for ADC output and MUX address loading-reduces wiring count in 4-wire interface mode. |
| SDO (Pin 24) | Serial data output | Three-state output with EOC bit (Bit 31); transitions to active-low on conversion completion-usable as hardware interrupt. |
| DIN (Pin 21) | Digital input | Loads 4-bit channel address into MUX during sleep state-enables seamless channel switching between conversions. |
Key Features
| Feature | Design Value |
|---|---|
| No-latency digital filter | Single-cycle settling ensures first conversion after channel change is valid-enables true time-division multiplexing without dead time or data discard. |
| Auto-calibration per cycle | Continuous offset and full-scale correction eliminates drift-induced errors over temperature and time-no calibration registers or host intervention required. |
| Extended input range | –12.5% to +112.5% of VREF accommodates sensor zero-shift and amplifier saturation margins-reduces need for precision front-end trimming. |
| Integrated oscillator | Eliminates external crystal or RC network-reduces BOM cost, PCB area, and layout sensitivity while guaranteeing 50/60 Hz rejection accuracy. |
| Flexible reference support | 0.1 V minimum VREF allows use of ultra-low-power references (e.g., REF191) without sacrificing resolution-critical for portable instrumentation. |
Applications
| Weight Scales | Direct Temperature Measurement |
|---|---|
Use Scenario: High-resolution load cell readout in commercial and industrial weighing systems requiring 1:1,000,000 dynamic range. IC Role / Device Role / Timing Role: 24-bit ADC digitizing mV-level bridge outputs with live-zero range to absorb thermal zero drift and cable compensation errors. Use Value: 4 ppm INL and 0.3 ppm noise enable <10 µg resolution on 10 kg platform-meeting OIML R76 Class III requirements without system calibration. | Use Scenario: Direct RTD or thermistor readout in HVAC controllers and environmental monitors where self-heating and lead resistance must be rejected. IC Role / Device Role / Timing Role: 8-channel ADC performing ratiometric measurements against stable reference, using extended input range to tolerate excitation current mismatch. Use Value: 110 dB 50/60 Hz rejection suppresses ambient EMI in unshielded duct-mounted sensors-eliminating software averaging overhead. |
| Gas Analyzers | Strain Gauge Transducers |
Use Scenario: Electrochemical or NDIR sensor signal conditioning in portable air quality meters requiring low power and high stability over temperature. IC Role / Device Role / Timing Role: Low-current, micropower ADC acquiring slow-varying sensor outputs with continuous auto-calibration to maintain baseline integrity over weeks. Use Value: 200 µA supply current and sleep-mode current of 20 µA extend AA battery life to >2 years-enabling maintenance-free field deployment. | Use Scenario: Full-bridge strain gauge readout in structural health monitoring and test benches where long-term zero stability is critical. IC Role / Device Role / Timing Role: Precision ADC capturing microstrain signals with live-zero range to absorb thermal EMF and solder-joint drift in harsh environments. Use Value: Offset error drift of 0.01 ppm/°C and full-scale drift of 0.02 ppm/°C ensure <0.02% FS error over –40°C to +85°C-exceeding ASTM E2210 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 24-bit delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1248IPWR | 24-bit, 2kSPS, integrated PGA and burn-out current sources; requires external crystal; 3.3V only supply. | Better suited for low-impedance sensor arrays with programmable gain; lacks extended input range and live-zero capability. | Select ADS1248IPWR when PGA flexibility and sensor excitation are needed; avoid if 5V operation or overrange tolerance is required. |
| MAX11206ETL+ | 24-bit, 120SPS, internal oscillator, 10ppm INL, 1.2µV RMS noise; 2.7–3.6V supply only; 20-pin TQFN. | Lower integration (no MUX), higher noise, and reduced linearity-suitable for cost-sensitive single-channel designs. | Select MAX11206ETL+ for compact, single-input applications where 4ppm INL is not mandatory; avoid for 8-channel or high-accuracy multiplexing. |
Compared with ADS1248IPWR and MAX11206ETL+, the LTC2408CG#PBF uniquely combines 8-channel multiplexing, live-zero input range, and no-latency filtering-making it optimal for high-stability, multi-sensor industrial DAQ where channel-switching integrity and overrange resilience are non-negotiable.
Availability
LTC2408CG#PBF is available at Aetrix Electronics and suitable for weight scales, gas analyzers, and strain gauge transducers requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for industrial OEM programs.
Supply support for LTC2408CG#PBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC2408CG#PBF belongs to ADI's legacy Linear Technology precision ADC product line, engineered specifically for low-power, high-accuracy sensor interface applications demanding exceptional DC specifications and robustness in noisy environments.
FAQ
What is the operating temperature range for the LTC2408CG#PBF?
The LTC2408CG#PBF is specified for the commercial temperature range of 0°C to +70°C. This is indicated by the "C" grade suffix in the part number. The device is packaged in a 28-lead SSOP and meets all electrical specifications across this range without derating. For extended temperature operation, the LTC2408IG#PBF (–40°C to +85°C) is available. The LTC2408CG#PBF does not require external thermal management under normal PCB layout conditions.
Does the LTC2408CG#PBF require external passive components for its internal oscillator?
No, the LTC2408CG#PBF does not require any external passive components for its internal oscillator. The oscillator is fully integrated and factory-trimmed to deliver precise 50 Hz or 60 Hz notch rejection when the FO pin is tied to VCC or GND. This eliminates crystals, capacitors, or resistors traditionally needed for line-frequency rejection-reducing BOM count, PCB area, and layout sensitivity. External clocking remains optional via the FO pin for custom rejection frequencies between 1 Hz and 120 Hz.
How does the LTC2408CG#PBF handle channel switching in multiplexed applications?
The LTC2408CG#PBF guarantees valid first-conversion results after channel switching due to its no-latency delta-sigma architecture. Unlike conventional sigma-delta ADCs requiring multiple settling cycles, the LTC2408CG#PBF's digital filter settles in one conversion period. Channel selection is performed via the DIN pin during the sleep state using a 4-bit serial address, and the next conversion immediately reflects the newly selected input-enabling deterministic, jitter-free time-division multiplexing without discarded samples or timing uncertainty.
What is the meaning of "live zero" in the LTC2408CG#PBF datasheet?
"Live zero" refers to the LTC2408CG#PBF's extended analog input range of –12.5% VREF to +112.5% VREF. This allows the ADC to accurately digitize signals below ground (e.g., –0.125 × VREF) and above nominal full scale (e.g., 1.125 × VREF), accommodating sensor zero-point shifts, amplifier offset errors, and overrange conditions without clipping or saturation. For example, with a 2.5 V reference, the input range spans –312.5 mV to +2.8125 V-providing margin to absorb thermal drift or transient overvoltage before signal conditioning stages.
Can the LTC2408CG#PBF interface directly with a standard SPI microcontroller?
Yes, the LTC2408CG#PBF interfaces directly with standard SPI microcontrollers using its 4-wire protocol (CSADC, SCK, SDO, DIN). It supports SPI Mode 0 (CPOL = 0, CPHA = 0) and is also compatible with MICROWIRE. Data is output MSB-first on SDO synchronized to SCK falling edges, and channel addresses are loaded on DIN synchronized to CLK rising edges. No level-shifting or protocol translation is required for 3.3 V or 5 V MCU systems, and the device tolerates input voltages up to VCC + 0.3 V per absolute maximum ratings.
LTC2408CG#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- microPOWER™
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 24
- Sampling Rate (Per Second):
- 7.5
- Number of Inputs:
- 8
- Input Type:
- Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-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:
- 0°C ~ 70°C
- Supplier Device Package:
- 28-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2408CG#PBF FAQ
1.How can I place an order for LTC2408CG#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2408CG#PBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC2408CG#PBF reliable?
The price and inventory of LTC2408CG#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2408CG#PBF is usually 5 days.
3.What payment methods are accepted for LTC2408CG#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2408CG#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2408CG#PBF?
LTC2408CG#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2408CG#PBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC2408CG#PBF?
For technical support, including LTC2408CG#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2408CG#PBF requirements.
6.How does Aetrix verify that LTC2408CG#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2408CG#PBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC2408CG#PBF meets industry standards.
7.What is the process for return or replacement of LTC2408CG#PBF?
All LTC2408CG#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2408CG#PBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC2408CG#PBF part is unused and in its original packaging.
Return procedure for LTC2408CG#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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