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Analog Devices Inc. LTC2404IG#PBF
- Part No.:
- LTC2404IG#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC2404IG#PBF.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,675
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Product details
Overview
LTC2404IG#PBF from Analog Devices (formerly Linear Technology) is a 4-channel, 24-bit micropower delta-sigma ADC with no-latency digital filtering, integrated oscillator, 4ppm INL, 0.3ppm RMS noise, and single-supply operation from 2.7V to 5.5V. It resolves analog inputs from –12.5% VREF to 112.5% VREF and delivers valid first-conversion results after channel change-ideal for precision weight scales and strain gauge transducer interfaces.
For engineers reviewing the LTC2404IG#PBF datasheet, LTC2404IG#PBF pinout, LTC2404IG#PBF application, or LTC2404IG#PBF equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternatives, and supply support for industrial instrumentation and low-power data acquisition systems.
Technical Context
The LTC2404IG#PBF implements a 24-bit delta-sigma modulator with decimating FIR filter and auto-calibrating architecture that performs offset and full-scale correction every conversion cycle. Its internal oscillator eliminates external timing components and enables 110dB min rejection at 50Hz or 60Hz ±2% via FO pin configuration.
It uses a flexible 4-wire serial interface compatible with SPI and MICROWIRE protocols, supports external clock input (2.56–307.2 kHz), and features a 4-channel analog multiplexer with break-before-make switching (290 ns), on-resistance of 120–300 Ω, and input leakage ≤±20 nA over temperature.
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 sensor front-ends. |
| 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 in conversion mode, 20 µA in sleep-enables battery-powered operation with <1 µA average current at 1 SPS. |
| Input Range | –0.125 × VREF to 1.125 × VREF-accommodates 12.5% sensor overrange/underrange without clipping or external level-shifting. |
| Notch Rejection | ≥110 dB at 50 Hz or 60 Hz ±2%-eliminates mains interference in industrial environments without external filters. |
| Reference Range | 0.1 V to VCC-allows direct use of low-drift 1.25 V or 2.5 V references, or rail-to-rail scaling for maximum SNR flexibility. |
Pinout & Package
Package: 28-lead plastic SSOP (G package), 5.6 mm × 10.2 mm, 0.635 mm pitch, RoHS-compliant, rated for –40°C to +85°C operating temperature.
| 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 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; determines full-scale range and noise floor-no external buffer required for stable references. |
| ADCIN (Pin 4) | Analog input node | Connects to MUXOUT; accepts extended range (–12.5% to +112.5% VREF); absolute max –0.3 V to VCC + 0.3 V. |
| MUXOUT (Pin 7) | Multiplexer output | Drives ADCIN; must be tied directly to Pin 4 for standard operation-no external gain or filtering needed. |
| CH0–CH3 (Pins 9–12) | Analog channel inputs | Four active differential-capable inputs; CH4–CH7 are no-connect on LTC2404IG#PBF (4-channel variant). |
| FO (Pin 26) | Filter oscillator control | Selects 50 Hz (FO = VCC), 60 Hz (FO = GND), or user-defined notch (external clock on FO pin). |
| CSADC / CSMUX (Pins 23 / 20) | Chip select inputs | Active-low enables ADC data output (CSADC) or MUX channel selection (CSMUX); typically tied together. |
| SCK / CLK (Pins 25 / 19) | Serial clock | Configurable as input (external SCK mode) or output (internal SCK mode); synchronizes 32-bit data transfer. |
| SDO (Pin 24) | Serial data output | Three-state output; bit 31 = EOC flag; bits 30–7 = 24-bit result (MSB first); bits 3–0 = sub-LSBs for averaging. |
| DIN (Pin 21) | Digital input | Serially loads 4-bit channel address during CSMUX high; last 4 bits before CSMUX low select next input channel. |
Key Features
| Feature | Design Value |
|---|---|
| No-latency digital filter | Single-cycle settling ensures first conversion after channel change is valid-enables true time-multiplexed multi-sensor sampling without dead time. |
| Auto-calibration per conversion | Continuous offset and full-scale correction eliminates drift-induced errors over time, temperature, and supply variation-no system-level recalibration needed. |
| Extended input range | –12.5% to +112.5% VREF accommodates sensor zero-offset, amplifier gain error, and transient overvoltage-reduces need for external clamping or trimming. |
| Integrated oscillator | Eliminates crystals, capacitors, or external clocks-reduces BOM count, layout area, and EMI risk while guaranteeing precise 50/60 Hz rejection. |
| Low power sleep mode | 20 µA quiescent current with indefinite result retention in static shift register-supports ultra-low-duty-cycle polling in energy-constrained applications. |
Applications
| Weight Scales | Direct Temperature Measurement |
|---|---|
Use Scenario: High-resolution weighing of industrial loads using load cells with mV/V output and ±10% zero offset. IC Role / Device Role / Timing Role: 24-bit ADC digitizes ratiometric bridge signals; extended input range absorbs sensor offset; no-latency filter enables rapid channel scanning across multiple cells. Use Value: Achieves 100,000+ display counts with <1 µV RMS noise and 4 ppm INL-meets OIML R76 Class III accuracy without firmware linearization. | Use Scenario: Precision RTD or thermistor measurements in HVAC controllers where ambient drift and self-heating affect accuracy. IC Role / Device Role / Timing Role: ADC interfaces 4-wire RTD with programmable excitation; internal calibration compensates for lead resistance and reference drift over temperature. Use Value: Delivers <0.01°C repeatability from –40°C to +85°C using only 2.5 V reference and no external op-amps or PGA stages. |
| Gas Analyzers | Strain Gauge Transducers |
Use Scenario: Electrochemical gas sensor readout requiring stable baseline tracking and low-frequency noise immunity in portable analyzers. IC Role / Device Role / Timing Role: ADC digitizes low-level current outputs (nA–µA) via transimpedance amplifier; 110 dB 50/60 Hz rejection suppresses mains-coupled interference. Use Value: Enables sub-ppm gas concentration resolution with 0.3 ppm RMS noise and auto-zeroed baseline-critical for CO, NO₂, and SO₂ detection. | Use Scenario: Structural health monitoring using bonded foil strain gauges exposed to thermal cycling and mechanical vibration. IC Role / Device Role / Timing Role: ADC captures differential bridge outputs with live-zero input range; continuous calibration maintains accuracy despite thermal TCR mismatch. Use Value: Maintains <0.05% FS error over –40°C to +85°C without hardware compensation-reducing calibration labor and field failure rates. |
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 |
|---|---|---|---|
| ADS124S08IPWR | 8-channel, 24-bit, 4 kSPS max, integrated PGA (1–128×), lower noise (0.15 µV RMS), but requires external crystal for 50/60 Hz rejection. | Better for high-speed multi-sensor systems needing programmable gain; less suitable for ultra-low-power or crystal-free designs. | Choose ADS124S08IPWR when PGA integration and higher throughput outweigh need for internal oscillator and lowest quiescent current. |
| MAX11206ETL+ | 4-channel, 24-bit, 10 SPS max, 0.25 µV RMS noise, internal oscillator, but only 105 dB 50/60 Hz rejection and no extended input range. | Better for cost-sensitive, low-throughput applications where 105 dB rejection suffices and sensor offsets are tightly controlled. | Choose MAX11206ETL+ when budget constraints dominate and system-level offset management is already implemented. |
Compared with LTC2404IG#PBF, ADS124S08IPWR offers higher speed and integrated gain but adds complexity and power; MAX11206ETL+ reduces cost and size but sacrifices 5 dB rejection margin and live-zero capability-making LTC2404IG#PBF optimal for ultra-stable, crystal-free, low-power precision measurement.
Availability
LTC2404IG#PBF is available at Aetrix Electronics and suitable for weight scales, direct temperature measurement, and gas analyzers requiring stable component supply, long-term calibration integrity, and RoHS-compliant packaging.
Supply support for LTC2404IG#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 LTC2404IG#PBF belongs to ADI's legacy Linear Technology precision ADC product line, designed specifically for low-power, high-accuracy sensor interfacing in harsh industrial environments where drift, noise, and EMI resilience are critical.
FAQ
What is the operating temperature range for the LTC2404IG#PBF?
The LTC2404IG#PBF is specified for operation from –40°C to +85°C (Industrial grade). This rating is confirmed in the "Order Information" table of the official datasheet, where "LTC2404I" denotes the Industrial temperature grade, and "G" indicates the 28-lead SSOP package. The device maintains full performance-including 4 ppm INL and 110 dB 50/60 Hz rejection-across this entire range.
Does the LTC2404IG#PBF require an external crystal or oscillator?
No, the LTC2404IG#PBF does not require an external crystal or oscillator. It integrates a highly accurate internal oscillator that enables 110 dB minimum 50 Hz or 60 Hz notch rejection without any external frequency-setting components. The FO pin selects between internal 50 Hz (FO = VCC), 60 Hz (FO = GND), or external clock modes-making LTC2404IG#PBF truly self-contained for precision AC-line rejection.
How many analog input channels does the LTC2404IG#PBF support?
The LTC2404IG#PBF supports exactly four analog input channels (CH0–CH3). Pins CH4 through CH7 are explicitly marked as "no connects" for the LTC2404 variant in the datasheet's pin function table and top-view diagram. This distinguishes it from the pin-compatible 8-channel LTC2408IG#PBF, which populates all eight channel pins.
What is the purpose of the extended input range (–12.5% to +112.5% VREF) in the LTC2404IG#PBF?
The extended input range allows the LTC2404IG#PBF to correctly digitize signals that fall outside the nominal 0 V to VREF span-such as sensor outputs with inherent DC offset, amplifier stage errors, or transient overvoltage events. This "live zero" capability eliminates the need for external level-shifting circuitry and prevents data loss due to clipping, directly improving system robustness and reducing bill-of-materials cost in real-world sensor interfaces using LTC2404IG#PBF.
Can the LTC2404IG#PBF interface directly with a microcontroller SPI bus?
Yes, the LTC2404IG#PBF features a 4-wire serial interface fully compatible with standard SPI and MICROWIRE protocols. It uses CSADC (chip select), SCK (clock), SDO (data out), and DIN (data in for channel selection), with timing parameters-including tKQMIN (15 ns hold time) and tKQMAX (200 ns setup)-verified to meet common MCU SPI peripheral requirements at up to 2 MHz SCK frequency in external clock mode.
LTC2404IG#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:
- 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:
- -
LTC2404IG#PBF FAQ
1.How can I place an order for LTC2404IG#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2404IG#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 LTC2404IG#PBF reliable?
The price and inventory of LTC2404IG#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2404IG#PBF is usually 5 days.
3.What payment methods are accepted for LTC2404IG#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2404IG#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2404IG#PBF?
LTC2404IG#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2404IG#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 LTC2404IG#PBF?
For technical support, including LTC2404IG#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2404IG#PBF requirements.
6.How does Aetrix verify that LTC2404IG#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2404IG#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 LTC2404IG#PBF meets industry standards.
7.What is the process for return or replacement of LTC2404IG#PBF?
All LTC2404IG#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2404IG#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 LTC2404IG#PBF part is unused and in its original packaging.
Return procedure for LTC2404IG#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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