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Analog Devices Inc. LTC2424IG#TRPBF
- Part No.:
- LTC2424IG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC2424IG#TRPBF.pdf
- Description:
- IC ADC 20BIT SIGMA-DELTA 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,861
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Product details
Overview
LTC2424IG#TRPBF from Analog Devices (formerly Linear Technology) is a 4-channel, 20-bit micropower delta-sigma ADC with no-latency digital filtering, integrated oscillator, and ±12.5% extended input range relative to VREF. It operates from 2.7V to 5.5V, draws only 200µA in conversion mode, and delivers 8ppm INL, 1.2ppm RMS noise, and ≥110dB 50/60Hz rejection - ideal for precision industrial sensor interfaces and low-power data acquisition systems.
For engineers reviewing the LTC2424IG#TRPBF datasheet, LTC2424IG#TRPBF pinout, LTC2424IG#TRPBF application, or LTC2424IG#TRPBF equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts with functional trade-offs, and supply-chain-ready availability details - all grounded in the official LTC2424/LTC2428 datasheet Rev. D.
Technical Context
The LTC2424IG#TRPBF implements a single-cycle settling decimating FIR filter synchronized to an internal oscillator (or external clock), eliminating latency between channel changes and ensuring the first conversion after multiplexer reconfiguration is fully valid. Its auto-calibrating architecture performs continuous offset and full-scale correction every cycle, delivering drift-free performance across temperature and supply voltage variation.
It uses a 28-pin SSOP package with dedicated analog inputs (CH0–CH3), reference-setting pins (FSSET/ZSSET), and a flexible 4-wire SPI/MICROWIRE-compatible serial interface (CSADC, SDO, SCK, DIN, CLK, CSMUX). The FO pin selects 50Hz/60Hz notch frequency or enables user-defined rejection from 1Hz to 800Hz via external oscillator input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 20-bit with no missing codes - guarantees monotonicity and full dynamic range utilization in high-precision measurement. |
| INL | 8ppm max over full temperature range - enables ≤0.0008% linearity error in 4½-digit DVM or strain-gage bridge applications. |
| RMS Noise | 1.2ppm of VREF (≈6µV RMS at 5V ref) - supports 112.5% overrange sensing without resolution loss in noisy industrial environments. |
| Power Supply | 2.7V to 5.5V single supply - allows direct interfacing with 3.3V or 5V microcontrollers and battery-powered sensors. |
| Supply Current | 200µA in conversion mode, 20µA in sleep - extends battery life in portable instrumentation and remote monitoring nodes. |
| Notch Rejection | ≥110dB at 50Hz or 60Hz ±2% - eliminates mains interference without external analog filters in weigh scales or gas analyzers. |
| Input Range | –12.5% to +112.5% of VREF - accommodates sensor offset, amplifier gain error, and transient overvoltage without clipping. |
Pinout & Package
Package: 28-lead plastic SSOP (G package), 5.6mm × 10.2mm body, 0.635mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1,6,16,18,22,27,28) | Ground reference | Multi-point grounding required for noise immunity; connects to PCB ground plane with minimal trace length. |
| VCC (Pins 2,8) | Positive supply | 2.7V–5.5V operation; requires local 10µF tantalum + 0.1µF ceramic bypass per pin for stable conversion. |
| FSSET (Pin 3) | Full-scale reference input | Sets upper end of conversion range; FSSET – ZSSET = VREF determines scaling and input span. |
| ADCIN (Pin 4) | Analog input node | Accepts mux output (MUXOUT); input voltage range is –0.125×VREF to +1.125×VREF. |
| ZSSET (Pin 5) | Zero-scale reference input | Sets lower end of conversion range; must be grounded for pin compatibility with LTC2404/LTC2408. |
| MUXOUT (Pin 7) | Multiplexer output | Connects directly to ADCIN; carries selected channel signal to ADC core. |
| CH0–CH3 (Pins 9–12) | Analog multiplexer inputs | Four dedicated differential-capable channels; CH4–CH7 are no-connect on LTC2424IG#TRPBF. |
| FO (Pin 26) | Filter oscillator control | Selects 50Hz (FO=VCC), 60Hz (FO=GND), or custom notch (FO=external clock) - defines rejection center frequency. |
| CSADC (Pin 23) | ADC chip select | Active-low enable for SDO output and conversion initiation; high state forces sleep mode for ultra-low power. |
| SDO (Pin 24) | Serial data output | 24-bit MSB-first stream (4-bit status + 20-bit result); three-state when CSADC is high. |
| SCK (Pin 25) | Serial clock output | Internally generated clock (19.2kHz typical) for synchronous data readout; falls on data-valid edge. |
Key Features
| Feature | Design Value |
|---|---|
| No-latency delta-sigma conversion | Single-cycle digital filter settling ensures first sample after channel change is accurate - eliminates dead time in multiplexed sensor arrays. |
| Integrated oscillator with no external components | Removes crystal, capacitor, or resistor timing network - reduces BOM count and layout sensitivity in space-constrained designs. |
| Extended input range (–12.5% to +112.5% VREF) | Accommodates sensor zero/gain drift and amplifier saturation without external level-shifting circuitry. |
| Auto-calibration per conversion cycle | Continuous offset and full-scale correction maintains TUE < 8ppm over temperature and supply variation - no manual recalibration needed. |
| Flexible 4-wire serial interface | Hardware-compatible with SPI and MICROWIRE protocols using shared CS/CLK/SCK/DIN lines - simplifies firmware integration. |
Applications
| Weight Scales | Direct Temperature Measurement |
|---|---|
|
Use Scenario: High-resolution load cell readout in commercial and industrial weighing platforms with AC mains noise. IC Role / Device Role / Timing Role: 20-bit ADC digitizing mV-level bridge outputs; 110dB 50/60Hz rejection suppresses ambient EMI without analog pre-filtering. Use Value: Enables 1:1,000,000 resolution (20-bit) with guaranteed monotonicity and no missing codes - critical for NTEP-certified scale accuracy. |
Use Scenario: Precision RTD or thermocouple measurement in HVAC controllers and process transmitters. IC Role / Device Role / Timing Role: Low-drift, low-noise ADC capturing µV-level thermal EMFs; extended input range absorbs cold-junction compensation offsets. Use Value: 1.2ppm RMS noise and 0.5ppm offset error ensure <0.01°C repeatability in Class A RTD systems without calibration tables. |
| Gas Analyzers | Strain-Gage Transducers |
|
Use Scenario: Electrochemical or NDIR sensor signal conditioning in portable air quality monitors. IC Role / Device Role / Timing Role: Micropower ADC sampling low-current sensor outputs; 200µA active current extends battery life in handheld units. Use Value: Sleep-mode current of 20µA enables multi-week operation on coin-cell batteries while maintaining fast wake-and-measure response. |
Use Scenario: Structural health monitoring using bonded foil or MEMS strain gages in bridges or machinery. IC Role / Device Role / Timing Role: Ratiometric ADC rejecting excitation voltage drift; FSSET/ZSSET pins enable true 4-wire Kelvin sensing. Use Value: Full-scale error of 4ppm and 0.04ppm/°C drift minimize temperature-induced zero-shift in long-term fatigue testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision, low-power ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2428IG#TRPBF | 8-channel variant in same 28-pin SSOP package; identical specs except CH4–CH7 are functional (not NC). | Supports larger sensor arrays without board redesign; same footprint and pinout as LTC2424IG#TRPBF. | Select LTC2428IG#TRPBF if future expansion to 8 channels is anticipated; no layout change required. |
| ADS124S08IPW | Texas Instruments 24-bit ADC with PGA, burn-out current, and built-in temperature sensor; higher power (350µA), different pinout. | Requires external reference and additional support components; better suited for integrated sensor modules than discrete front-ends. | Choose ADS124S08IPW only when on-chip PGA or diagnostics are mandatory; not drop-in compatible. |
Compared with LTC2424IG#TRPBF, LTC2428IG#TRPBF offers immediate channel scalability within identical mechanical and electrical constraints, while ADS124S08IPW trades pin compatibility for integrated analog features - making LTC2424IG#TRPBF optimal for cost-sensitive, space-limited 4-channel precision systems requiring minimal external components.
Availability
LTC2424IG#TRPBF is available at Aetrix Electronics and suitable for weight scales, gas analyzers, direct temperature measurement, and strain-gage transducer applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LTC2424IG#TRPBF 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 LTC2424IG#TRPBF belongs to ADI's precision delta-sigma ADC product line, designed specifically for low-power, high-accuracy sensor signal acquisition in harsh industrial environments where noise immunity, long-term stability, and minimal external components are critical.
FAQ
What is the operating temperature range of the LTC2424IG#TRPBF?
The LTC2424IG#TRPBF is rated for –40°C to +85°C industrial temperature range, as indicated by the "I" grade suffix in its part number. This is validated across all key specifications including INL (8ppm), offset error (0.5ppm), and supply current (200µA typ), ensuring reliable performance in factory automation and outdoor instrumentation where ambient temperatures fluctuate widely.
Does the LTC2424IG#TRPBF require external passive components for its internal oscillator?
No, the LTC2424IG#TRPBF does not require any external passive components for its internal oscillator. As stated in the datasheet, the oscillator is fully integrated and self-contained - enabling 50Hz or 60Hz notch filtering without crystals, capacitors, or resistors. This eliminates timing-component tolerances and reduces PCB area, making LTC2424IG#TRPBF ideal for compact, cost-sensitive designs.
How does the LTC2424IG#TRPBF handle channel switching in multiplexed applications?
The LTC2424IG#TRPBF guarantees no latency on channel change: the first conversion after selecting a new input channel (via DIN/CSMUX) is fully settled and accurate. This is achieved through its single-cycle digital filter architecture and automatic per-cycle calibration - eliminating the need for discarded "settling" samples common in other delta-sigma ADCs and simplifying firmware for 4-channel sensor polling.
Can the LTC2424IG#TRPBF be used with a 2.5V reference voltage?
Yes, the LTC2424IG#TRPBF supports reference voltages from 0.1V to VCC, and 2.5V is a commonly used value. At VREF = 2.5V, the device delivers 8ppm INL, 0.5ppm offset error, and total unadjusted error of 8ppm - matching the datasheet's typical performance curves. Input range becomes –0.3125V to +2.8125V, well within absolute maximum ratings.
Is the LTC2424IG#TRPBF pin-compatible with the LTC2404/LTC2408 series?
Yes, the LTC2424IG#TRPBF is pin-compatible with the LTC2404/LTC2408 when ZSSET (Pin 5) is grounded. Both share identical 28-pin SSOP footprints and pin functions. However, LTC2424IG#TRPBF outputs 24-bit words versus 32-bit on LTC2404/LTC2408; compatibility is maintained by reading only the first 24 bits or adding 8 dummy clocks to match timing.
LTC2424IG#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- microPOWER™
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 20
- Sampling Rate (Per Second):
- 7.5
- Number of Inputs:
- 4
- 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:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2424IG#TRPBF FAQ
1.How can I place an order for LTC2424IG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2424IG#TRPBF 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 LTC2424IG#TRPBF reliable?
The price and inventory of LTC2424IG#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2424IG#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2424IG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2424IG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2424IG#TRPBF?
LTC2424IG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2424IG#TRPBF 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 LTC2424IG#TRPBF?
For technical support, including LTC2424IG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2424IG#TRPBF requirements.
6.How does Aetrix verify that LTC2424IG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2424IG#TRPBF 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 LTC2424IG#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2424IG#TRPBF?
All LTC2424IG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2424IG#TRPBF, 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 LTC2424IG#TRPBF part is unused and in its original packaging.
Return procedure for LTC2424IG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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