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Analog Devices Inc. LTC2428CG#TRPBF
- Part No.:
- LTC2428CG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC2428CG#TRPBF.pdf
- Description:
- IC ADC 20BIT SIGMA-DELTA 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,067
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Product details
Overview
LTC2428CG#TRPBF from Analog Devices (formerly Linear Technology) is an 8-channel, 20-bit micropower delta-sigma ADC with no-latency digital filtering, integrated oscillator, 8 ppm INL, and 1.2 ppm RMS noise. It operates from 2.7V to 5.5V, accepts reference voltages from 0.1V to VCC, and delivers valid first-conversion accuracy after channel change-enabling high-precision sensor data acquisition in weight scales and industrial process control.
For engineers reviewing the LTC2428CG#TRPBF datasheet, LTC2428CG#TRPBF pinout, LTC2428CG#TRPBF application, or LTC2428CG#TRPBF equivalent, key selection criteria include its 110 dB 50/60 Hz notch rejection, extended input range (–12.5% to +112.5% VREF), SPI/MICROWIRE-compatible 4-wire interface, and auto-calibrating architecture ensuring stable offset/full-scale performance across temperature and supply variation.
Technical Context
The LTC2428CG#TRPBF implements a decimating FIR filter synchronized to an internal oscillator or user-supplied external clock (1 Hz–800 Hz), enabling programmable line-frequency rejection at 50 Hz or 60 Hz ±2% with ≥110 dB attenuation. Its no-latency architecture guarantees that every conversion-including the first after multiplexer channel switching-is fully settled and accurate.
It integrates dual calibration loops per conversion cycle: one for offset (0.5 ppm typical) and one for full-scale (4 ppm typical), eliminating drift-induced errors without interrupting continuous operation. The analog front-end supports live-zero operation via separate FSSET and ZSSET pins, allowing seamless accommodation of sensor offset and overrange conditions within –0.125·VREF to +1.125·VREF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 20-bit no-missing-codes-guarantees monotonicity and unambiguous digital representation of analog inputs across full dynamic range. |
| INL | 8 ppm max over temperature-ensures ≤±0.0008% full-scale deviation, critical for precision instrumentation and metrology-grade measurements. |
| RMS Noise | 1.2 ppm of VREF-translates to ~6 µV RMS noise at 5 V reference, supporting sub-µV-level signal resolution in low-noise sensor interfaces. |
| Supply Current | 200 µA typical in conversion mode-enables battery-powered or energy-constrained applications like portable DVMs and remote sensors. |
| Input Range | –12.5% to +112.5% VREF-accommodates sensor zero-offset and gain errors without external level-shifting circuitry. |
| Line Rejection | ≥110 dB at 50 Hz or 60 Hz ±2%-achieved via synchronous digital filtering, eliminating need for external analog notch filters in noisy industrial environments. |
| Reference Range | 0.1 V to VCC-supports low-voltage references (e.g., 1.25 V bandgap) while maintaining 20-bit effective resolution and calibrated accuracy. |
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, 6, 16, 18, 22, 27, 28) | Ground reference | Multiple dedicated ground pins minimize ground bounce and ensure stable reference for both analog and digital sections. |
| 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. |
| FSSET (Pin 3) | Full-scale set input | Defines upper end of conversion range; when VIN = FSSET, output = FFFFFH (full scale). |
| ZSSET (Pin 5) | Zero-scale set input | Defines lower end of conversion range; when VIN = ZSSET, output = 00000H (zero scale); must be grounded for LTC2404/LTC2408 compatibility. |
| CH0–CH7 (Pins 9–13, 14, 15, 17) | Analog multiplexer inputs | Eight independent single-ended channels; CH4–CH7 are no-connect on LTC2424 but functional on LTC2428CG#TRPBF. |
| FO (Pin 26) | Filter oscillator control | Selects internal 50 Hz (FO = VCC), 60 Hz (FO = GND), or external clock (FO = fEOSC) for programmable notch frequency. |
| CSADC / CSMUX (Pins 23, 20) | Chip select inputs | Active-low enables ADC data output (CSADC) or MUX channel address latching (CSMUX); typically tied together for 4-wire operation. |
| SDO / SCK / DIN / CLK (Pins 24, 25, 21, 19) | Serial interface signals | 24-bit MSB-first SPI/MICROWIRE-compatible interface; SDO outputs status + 20-bit result; SCK clocks data out on falling edge. |
Key Features
| Feature | Design Value |
|---|---|
| No-latency delta-sigma conversion | Every conversion-including first after channel change-is fully settled and valid, eliminating traditional settling delays in multiplexed systems. |
| Auto-calibrating architecture | Continuous per-cycle offset and full-scale calibration ensures <0.04 ppm/°C drift, removing need for periodic system recalibration. |
| Extended input voltage range | –0.125·VREF to +1.125·VREF accommodates sensor offsets and amplifier saturation without external clamping or level-shifting. |
| Integrated 50/60 Hz notch filter | On-chip digital filter provides ≥110 dB rejection at line frequency ±2%, eliminating external analog filter components and layout sensitivity. |
| Flexible reference support | Accepts 0.1 V to VCC reference voltage-enables use of low-power bandgap references or direct connection to precision DAC outputs. |
Applications
| Weight Scales | Direct Temperature Measurement |
|---|---|
Use Scenario: High-resolution weighing systems using strain-gage load cells with mV-level outputs and significant thermal drift. IC Role / Device Role / Timing Role: 20-bit ADC digitizes conditioned bridge output; internal calibration compensates for sensor offset drift over temperature. Use Value: Achieves 1:1,000,000 dynamic range with no external calibration, enabling Class III legal-for-trade accuracy in compact form factors. | Use Scenario: Precision RTD or thermistor-based temperature monitoring in HVAC controllers and medical devices. IC Role / Device Role / Timing Role: Digitizes ratiometric sensor voltage with live-zero capability to handle cold-junction compensation offsets. Use Value: Eliminates need for external op-amp biasing and reference trimming, reducing BOM count and improving long-term stability. |
| Gas Analyzers | Industrial Process Control |
Use Scenario: Electrochemical gas sensors requiring ultra-low-noise, high-linearity digitization of picoamp-level currents via transimpedance amplifiers. IC Role / Device Role / Timing Role: ADC captures low-amplitude, low-frequency sensor outputs while rejecting 50/60 Hz interference from nearby AC wiring. Use Value: 1.2 ppm RMS noise and ≥110 dB line rejection enable sub-ppm gas concentration detection without shielded enclosures. | Use Scenario: Distributed I/O modules acquiring analog signals from pressure, flow, and level transmitters in factory automation. IC Role / Device Role / Timing Role: 8-channel multiplexer interfaces multiple 4–20 mA loop receivers; SPI interface simplifies microcontroller integration. Use Value: Single-chip solution reduces PCB area and power vs. discrete ADC + mux combinations, while maintaining 20-bit integrity across all channels. |
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 |
|---|---|---|---|
| ADS124S08IPWR | 24-bit delta-sigma ADC with PGA, 35 µA sleep current, but no integrated 50/60 Hz notch; requires external clock or digital post-processing for line rejection. | Best suited for battery-powered portable instruments where ultimate resolution >20 bits is required and line rejection can be handled digitally. | Select ADS124S08IPWR when higher resolution and integrated PGA are needed, and when system firmware can implement digital line-frequency filtering. |
| LTC2408CG#TRPBF | 8-channel 24-bit pin-compatible predecessor with identical pinout and interface; differs in output word length (32-bit vs 24-bit) and lacks FO pin for programmable notch selection. | Used where legacy designs require drop-in replacement with identical timing and layout, accepting fixed 50/60 Hz rejection without FO control. | Select LTC2408CG#TRPBF only for backward compatibility with existing LTC2408 layouts; LTC2428CG#TRPBF offers superior flexibility and lower power. |
Compared with ADS124S08IPWR, LTC2428CG#TRPBF delivers guaranteed 110 dB hardware-based line rejection and simpler system integration, while LTC2408CG#TRPBF shares footprint but lacks programmable notch control and consumes more power-making LTC2428CG#TRPBF optimal for new designs demanding robustness and efficiency.
Availability
LTC2428CG#TRPBF is available at Aetrix Electronics and suitable for weight scales, industrial process control, and gas analyzers requiring stable component supply, long-term calibration integrity, and immunity to 50/60 Hz interference in harsh electrical environments.
Supply support for LTC2428CG#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 LTC2428CG#TRPBF belongs to ADI's precision delta-sigma ADC product line, engineered specifically for high-accuracy, low-power, multi-channel sensor digitization in applications where calibration stability, line-frequency immunity, and ease of integration are critical design requirements.
FAQ
What is the operating temperature range for the LTC2428CG#TRPBF?
The LTC2428CG#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 DC and AC specifications unless otherwise noted. The "CG" suffix explicitly denotes the commercial temperature grade, distinguishing it from the industrial-grade "IG" variant rated for –40°C to 85°C.
Does the LTC2428CG#TRPBF require external passive components for its internal oscillator?
No, the LTC2428CG#TRPBF requires no external passive components for its internal oscillator. As stated in the datasheet description, "The internal oscillator requires no external frequency setting components." The oscillator is fully integrated and automatically configures for 50 Hz or 60 Hz notch rejection based on the FO pin state-eliminating crystals, capacitors, or resistors traditionally needed for precision timing.
How does the LTC2428CG#TRPBF achieve "no latency" in multiplexed operation?
The LTC2428CG#TRPBF achieves no-latency operation through a synchronized decimating FIR filter architecture that settles in a single conversion cycle. Unlike conventional delta-sigma ADCs requiring multiple cycles to settle after channel changes, the LTC2428CG#TRPBF guarantees that the first conversion result after selecting a new channel is fully accurate and valid-enabling true real-time multiplexed sampling without discarded samples or timing overhead.
Can the LTC2428CG#TRPBF interface directly with a 3.3V microcontroller SPI port?
Yes, the LTC2428CG#TRPBF supports 3.3V logic levels: VIH is 2.0 V min for VCC ≤ 3.3V, and VOL is 0.4 V max at 1.6 mA sink, satisfying standard SPI voltage thresholds. Its SDO output is three-state and compatible with 3.3V MCU inputs; SCK, CSADC, and DIN accept 3.3V-compatible logic levels without level shifters-provided VCC is set to 3.3V and all digital signals remain within absolute maximum ratings.
What is the purpose of the ZSSET and FSSET pins on the LTC2428CG#TRPBF?
The ZSSET (Pin 5) and FSSET (Pin 3) pins define the zero-scale and full-scale reference points for the LTC2428CG#TRPBF's transfer function. When VIN equals ZSSET, the output reads 00000H; when VIN equals FSSET, the output reads FFFFFH. Their difference (FSSET – ZSSET) establishes VREF, enabling live-zero operation and accommodating sensor offsets-critical for strain-gage and RTD applications where baseline shifts occur.
LTC2428CG#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:
- 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:
- -
LTC2428CG#TRPBF FAQ
1.How can I place an order for LTC2428CG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2428CG#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 LTC2428CG#TRPBF reliable?
The price and inventory of LTC2428CG#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2428CG#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2428CG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2428CG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2428CG#TRPBF?
LTC2428CG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2428CG#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 LTC2428CG#TRPBF?
For technical support, including LTC2428CG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2428CG#TRPBF requirements.
6.How does Aetrix verify that LTC2428CG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2428CG#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 LTC2428CG#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2428CG#TRPBF?
All LTC2428CG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2428CG#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 LTC2428CG#TRPBF part is unused and in its original packaging.
Return procedure for LTC2428CG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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