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Analog Devices Inc. LTC2424CG#TRPBF
- Part No.:
- LTC2424CG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC2424CG#TRPBF.pdf
- Description:
- IC ADC 20BIT SIGMA-DELTA 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,402
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Product details
Overview
LTC2424CG#TRPBF from Analog Devices (formerly Linear Technology) is a 4-channel, 20-bit micropower delta-sigma ADC with no-latency digital filtering, integrated oscillator, 8ppm INL, and 1.2ppm RMS noise. It operates from 2.7V to 5.5V, accepts reference voltages from 0.1V to VCC, and delivers valid first-conversion results after channel changes-enabling high-precision sensor readout in weight scales and industrial process control.
For engineers reviewing the LTC2424CG#TRPBF datasheet, LTC2424CG#TRPBF pinout, LTC2424CG#TRPBF application, or LTC2424CG#TRPBF equivalent, key selection criteria include its single-cycle filter settling, 110dB 50/60Hz notch rejection, extended input range (–12.5% to +112.5% VREF), low 200µA supply current, and SPI/MICROWIRE-compatible 4-wire interface.
Technical Context
The LTC2424CG#TRPBF implements a decimating FIR filter synchronized to an internal oscillator or external clock (1Hz–800Hz), enabling programmable line-frequency rejection at 50Hz or 60Hz ±2% without external components. Its auto-calibrating architecture performs offset and full-scale correction every conversion cycle.
It integrates a 4-channel analog multiplexer with 250Ω on-resistance (VCC = 2.7V), 120dB channel-to-channel isolation, and break-before-make timing of 290ns. The ADCIN–MUXOUT path supports live-zero operation, resolving sensor offset and overrange conditions before digitization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 20-bit with no missing codes-guarantees monotonicity and full dynamic range utilization. |
| INL | 8ppm max over temperature-ensures ≤±0.0008% full-scale error for precision instrumentation. |
| RMS Noise | 1.2ppm of VREF-translates to ~6µV RMS at 5V reference, supporting 20-bit effective resolution. |
| Supply Current | 200µA in conversion mode-enables battery-powered data acquisition with multi-year runtime. |
| Input Range | –12.5% to +112.5% VREF-accommodates sensor offsets and 12.5% overrange without clipping. |
| Line Rejection | ≥110dB at 50Hz or 60Hz ±2%-eliminates mains interference in industrial environments without external filters. |
| Reference Range | 0.1V to VCC-allows direct use of low-voltage references or rail-to-rail buffered sources. |
Pinout & Package
Package: 28-lead plastic SSOP (G package), 5.6mm × 10.2mm body, 0.65mm 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 system ground plane. |
| VCC (Pins 2,8) | Positive supply | 2.7V–5.5V operation; requires local 10µF tantalum + 0.1µF ceramic bypassing. |
| FSSET (Pin 3) | Full-scale set input | Defines upper end of input range; FSSET – ZSSET = VREF. |
| ADCIN (Pin 4) | Analog input node | Accepts MUXOUT signal; supports extended range from –0.125×VREF to +1.125×VREF. |
| ZSSET (Pin 5) | Zero-scale set input | Defines lower end of input range; must be grounded for LTC2404/LTC2408 compatibility. |
| MUXOUT (Pin 7) | Multiplexer output | Drives ADCIN; connects selected CHx to converter front-end. |
| CH0–CH3 (Pins 9–12) | Analog input channels | Four single-ended inputs; CH4–CH7 are no-connect on LTC2424CG#TRPBF. |
| FO (Pin 26) | Filter oscillator control | Selects 50Hz (FO=VCC), 60Hz (FO=GND), or user-defined notch via external clock. |
| CSADC / CSMUX (Pins 23,20) | Chip select inputs | Enable ADC data output and MUX channel addressing; driven in parallel for 4-wire simplicity. |
| SCK / CLK (Pins 25,19) | Serial clock | Controls SDO data timing; functions as output (internal SCK mode) or input (external SCK mode). |
| SDO (Pin 24) | Serial data output | 24-bit MSB-first stream: 4 status bits + 20 conversion bits; three-state when CSADC = HIGH. |
| DIN (Pin 21) | Digital input | Receives 4-bit MUX channel address on rising CLK edges while CSMUX = HIGH. |
Key Features
| Feature | Design Value |
|---|---|
| No-latency delta-sigma conversion | Single-cycle digital filter settling ensures first-conversion validity after channel change-critical for multiplexed sensor arrays. |
| Integrated oscillator with programmable notch | Eliminates crystals/capacitors; enables 50Hz/60Hz ±2% rejection ≥110dB without external tuning. |
| Live-zero extended input range | –12.5% to +112.5% VREF accommodates pre-amplifier offsets and sensor overrange-reducing need for external level-shifting. |
| Per-conversion auto-calibration | Continuous offset and full-scale correction maintains stability across temperature, supply, and time-no calibration registers required. |
| SPI/MICROWIRE-compatible 4-wire interface | Shared SCK/CLK and CSADC/CSMUX pins reduce PCB routing complexity and enable drop-in replacement in legacy designs. |
Applications
| Weight Scales | Direct Temperature Measurement |
|---|---|
Use Scenario: High-resolution load cell readout in commercial and industrial weighing systems requiring <10ppm accuracy. IC Role / Device Role / Timing Role: Primary 20-bit ADC capturing mV-level bridge outputs with live-zero compensation for tare offset. Use Value: 8ppm INL and 1.2ppm noise enable 1:1,000,000 resolution without oversampling or post-processing. |
Use Scenario: Direct thermocouple or RTD measurement in HVAC controllers and environmental monitors. IC Role / Device Role / Timing Role: Precision front-end digitizing low-level thermal EMFs with cold-junction compensation support. Use Value: Extended input range handles thermocouple offset drift; 110dB line rejection suppresses 50/60Hz pickup in unshielded wiring. |
| Gas Analyzers | Strain-Gage Transducers |
Use Scenario: Electrochemical sensor signal conditioning in portable air quality analyzers requiring low power and high SNR. IC Role / Device Role / Timing Role: Low-noise, micropower ADC digitizing nA-level sensor currents via precision transimpedance amplifiers. Use Value: 200µA supply current extends battery life; 1.2ppm RMS noise preserves detection limits for trace gas quantification. |
Use Scenario: Structural health monitoring using bonded foil strain gages in bridges, aircraft, or machinery. IC Role / Device Role / Timing Role: Ratiometric ADC measuring Wheatstone bridge imbalance with reference derived from excitation voltage. Use Value: Reference range down to 0.1V allows direct use of low-noise 1.25V bandgap references, minimizing drift-induced errors. |
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 |
|---|---|---|---|
| LTC2428CG#TRPBF | 8-channel variant with identical specs, pinout, and performance-CH4–CH7 connected instead of NC. | Supports larger sensor arrays without layout change; same footprint and interface. | Select when >4 analog inputs are required; shares same driver/firmware stack. |
| ADS124S08IPW | 24-bit, 8-channel, 4kSPS delta-sigma ADC with PGA, burn-out current, and CRC-higher speed but 350µA typical supply current. | Includes integrated programmable gain amplifier and sensor diagnostics not present in LTC2424CG#TRPBF. | Choose for higher resolution or built-in signal conditioning; avoid if ultra-low power (<250µA) or minimal BOM count is critical. |
Compared with LTC2428CG#TRPBF, the LTC2424CG#TRPBF reduces channel count for cost-sensitive 4-input systems while retaining identical noise, INL, and power specs; versus ADS124S08IPW, it trades integrated features for lower quiescent current and simpler interface-ideal for fixed-gain, low-throughput precision sensing.
Availability
LTC2424CG#TRPBF is available at Aetrix Electronics and suitable for weight scales, industrial process control, and portable gas analyzers requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC2424CG#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 semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC2424CG#TRPBF belongs to ADI's precision delta-sigma ADC product line, designed specifically for low-power, high-accuracy sensor interfacing in harsh electrical environments where line-frequency rejection and long-term stability are critical.
FAQ
What is the operating temperature range for the LTC2424CG#TRPBF?
The LTC2424CG#TRPBF is specified for operation from 0°C to 70°C (Commercial grade). This range is confirmed in the Absolute Maximum Ratings table and applies to all electrical specifications unless otherwise noted. The 'C' suffix in the part number explicitly denotes this temperature grade, distinguishing it from the industrial-grade 'I' variant (–40°C to 85°C).
Does the LTC2424CG#TRPBF require external passive components for its internal oscillator?
No, the LTC2424CG#TRPBF does not require external passive components for its internal oscillator. As stated in the datasheet description and Features list, the internal oscillator requires no external frequency-setting components. The FO pin selects between 50Hz or 60Hz rejection modes or accepts an external clock-no crystals, capacitors, or resistors are needed for basic operation.
Can the LTC2424CG#TRPBF be used with a 1.25V reference voltage?
Yes, the LTC2424CG#TRPBF supports reference voltages as low as 0.1V, so a 1.25V reference is fully within specification. The datasheet explicitly states "Reference Input Voltage: 0.1V to VCC" and recommends 100mV to VCC. At 1.25V, the extended input range becomes –0.156V to +1.406V, and noise remains ~1.2ppm of VREF (~15.5µVRMS).
How does the LTC2424CG#TRPBF handle channel switching latency?
The LTC2424CG#TRPBF provides no-latency conversion: the first result after a channel change is always valid and corresponds to the newly selected input. This is achieved via single-cycle digital filter settling and is emphasized in both the product title ("No Latency ∆Σ™") and Features list-eliminating the need for discarded samples or delay timers in multiplexed systems.
Is the LTC2424CG#TRPBF pin-compatible with the LTC2404?
Yes, the LTC2424CG#TRPBF is pin-compatible with the LTC2404 when ZSSET (Pin 5) is grounded. The datasheet states: "Can Be Interchanged with 24-Bit LTC2404/LTC2408 if ZSSET Pin is Grounded." While output word length differs (24-bit vs 32-bit), timing and pin functions match, enabling mechanical and layout compatibility in existing designs.
LTC2424CG#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:
- 0°C ~ 70°C
- Supplier Device Package:
- 28-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2424CG#TRPBF FAQ
1.How can I place an order for LTC2424CG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2424CG#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 LTC2424CG#TRPBF reliable?
The price and inventory of LTC2424CG#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2424CG#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2424CG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2424CG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2424CG#TRPBF?
LTC2424CG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2424CG#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 LTC2424CG#TRPBF?
For technical support, including LTC2424CG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2424CG#TRPBF requirements.
6.How does Aetrix verify that LTC2424CG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2424CG#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 LTC2424CG#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2424CG#TRPBF?
All LTC2424CG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2424CG#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 LTC2424CG#TRPBF part is unused and in its original packaging.
Return procedure for LTC2424CG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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