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Analog Devices Inc. LTC2404CG#PBF
- Part No.:
- LTC2404CG#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC2404CG#PBF.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,025
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Product details
Overview
LTC2404CG#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 sensor outputs in precision weight scales and industrial process control where extended input range (–12.5% to +112.5% VREF) accommodates signal conditioning offsets and overrange conditions.
For engineers reviewing the LTC2404CG#PBF datasheet, LTC2404CG#PBF pinout, LTC2404CG#PBF application, or LTC2404CG#PBF equivalent, key selection criteria include 50/60Hz notch rejection ≥110dB, live-zero input range, SPI/MICROWIRE-compatible 4-wire interface, 200µA supply current in conversion mode, and guaranteed no missing codes across temperature.
Technical Context
The LTC2404CG#PBF implements a decimating FIR filter synchronized to an internal oscillator or external clock (1Hz–120Hz), enabling single-cycle settling with zero latency-ensuring the first conversion after channel change is valid. Its auto-calibrating architecture performs offset and full-scale correction every cycle, delivering stable 0.5ppm offset and 4ppm full-scale error over temperature.
It integrates a 28-pin SSOP multiplexer with four analog inputs (CH0–CH3), MUXOUT tied to ADCIN, and configurable FO pin for 50Hz/60Hz ±2% rejection or user-defined notch frequency. The 4-wire serial interface supports both internal SCK output (19.2kHz) and external SCK input modes without register programming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit with no missing codes-guarantees monotonicity and eliminates code gaps in high-precision measurement systems. |
| INL | 4ppm max at VREF = 5V-enables 16-bit effective resolution even under full-scale stress conditions. |
| RMS Noise | 0.3ppm of VREF-translates to ~1.5µV RMS noise at 5V reference, supporting sub-microvolt-level signal detection. |
| Power Supply | 2.7V to 5.5V single supply-simplifies power design in battery-powered or mixed-voltage industrial systems. |
| Supply Current | 200µA in conversion mode, 20µA in sleep-extends operational life in portable instrumentation and remote sensors. |
| Input Range | –0.125 × VREF to +1.125 × VREF-absorbs ±12.5% gain/offset errors from upstream amplifiers or transducers without clipping. |
| Notch Rejection | ≥110dB at 50Hz or 60Hz ±2%-eliminates mains interference in laboratory-grade DVMs and strain gauge readouts. |
Pinout & Package
Package: 28-lead plastic SSOP (G package), 5.6mm × 10.2mm body, 0.635mm lead 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 reduce ground bounce and improve PSRR in noisy industrial environments. |
| VCC (Pins 2,8) | Positive supply | Dual supply pins enable low-impedance local bypassing with 10µF tantalum + 0.1µF ceramic capacitors. |
| VREF (Pin 3) | Reference input | Accepts 0.1V to VCC-supports low-voltage references for improved INL or high-precision external references. |
| ADCIN (Pin 4) | Analog input to ADC core | Connected to MUXOUT; receives selected channel's signal after internal multiplexing. |
| MUXOUT (Pin 7) | Multiplexer output | Drives ADCIN; must be externally tied to Pin 4 for standard operation. |
| CH0–CH3 (Pins 9–12) | Analog multiplexer inputs | Four active channels; CH4–CH7 are no-connect on LTC2404CG#PBF per datasheet. |
| FO (Pin 26) | Filter oscillator control | Selects 50Hz (FO=VCC), 60Hz (FO=GND), or external clock (FO=driven)-configures notch frequency without external components. |
| CSADC / CSMUX (Pins 23,20) | Chip select inputs | Driven in parallel for simplified 4-wire interface; CSADC enables SDO output and initiates data transfer. |
| SCK / CLK (Pins 25,19) | Serial clock I/O | Configurable as internal SCK output (19.2kHz) or external clock input-no mode registers required. |
| SDO (Pin 24) | 3-state serial data output | Provides EOC bit (Bit 31) for interrupt-driven microcontroller polling; high-Z when CSADC = high. |
Key Features
| Feature | Design Value |
|---|---|
| No-latency digital filtering | Single-cycle filter settling ensures first conversion after channel switch is valid-enables true time-synchronized multi-channel sampling. |
| Integrated oscillator | Eliminates crystals, capacitors, or external clocks-reduces BOM count and layout area while guaranteeing 50/60Hz rejection stability. |
| Extended input range | –12.5% to +112.5% VREF accommodates sensor offset drift and amplifier saturation margins without external level-shifting circuitry. |
| Per-conversion auto-calibration | Continuous offset and full-scale correction removes long-term drift and supply/temperature dependencies-no calibration routines needed in firmware. |
| SPI/MICROWIRE compatibility | 4-wire interface operates with standard microcontroller peripherals-no custom drivers or protocol translation required. |
Applications
| Weight Scales | Direct Temperature Measurement |
|---|---|
Use Scenario: High-resolution load cell readout in commercial and industrial weighing systems requiring NTEP or OIML certification. IC Role / Device Role / Timing Role: Primary 24-bit ADC digitizing mV-level bridge outputs with live-zero range to absorb thermal EMF and amplifier offset. Use Value: 4ppm INL and 0.3ppm noise support ≤0.001% full-scale accuracy; 110dB 50/60Hz rejection prevents mains-induced weight fluctuation. | Use Scenario: Precision RTD or thermistor measurements in HVAC controllers and environmental monitoring nodes. IC Role / Device Role / Timing Role: Delta-sigma ADC with programmable notch and extended input range directly interfacing 2-/3-/4-wire RTD bridges. Use Value: –12.5% to +112.5% VREF range captures cold-junction compensation offsets; 200µA supply enables battery operation for wireless sensor nodes. |
| Gas Analyzers | Strain Gauge Transducers |
Use Scenario: Electrochemical or NDIR gas concentration detection where ppm-level signal integrity is critical. IC Role / Device Role / Timing Role: Low-noise ADC capturing weak current-to-voltage converter outputs with high CMRR and line-rejection. Use Value: 0.3ppm RMS noise enables sub-µV resolution; 110dB normal-mode rejection suppresses EMI from pump motors and display drivers. | Use Scenario: Structural health monitoring using bonded foil or MEMS strain gauges in civil infrastructure or aerospace test benches. IC Role / Device Role / Timing Role: 4-channel ADC multiplexing quarter-bridge configurations with per-channel offset cancellation. Use Value: No-latency settling allows rapid channel switching between gauge groups; 24-bit resolution resolves microstrain-level deflections. |
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 | 8-channel, 24-bit, 2.5V–5.5V supply, 350µA typical current, integrated PGA (1x–128x), no internal oscillator-requires external clock or crystal. | Requires external clock source and PGA configuration; better suited for variable-gain sensor interfaces but adds complexity and component count. | Select ADS1248IPWR when programmable gain or higher channel count is required; avoid if oscillator-free design and minimal BOM are priorities. |
| MAX11206ETL+ | 4-channel, 24-bit, 2.7V–3.6V supply only, 125µA typical current, 75dB 50/60Hz rejection, no extended input range (0–VREF). | Limited supply voltage range and lower rejection make it unsuitable for wide-input industrial sensors or dual-supply systems. | Select MAX11206ETL+ only for ultra-low-power, single-supply 3.3V systems where 110dB rejection is not required. |
Compared with ADS1248IPWR and MAX11206ETL+, the LTC2404CG#PBF uniquely combines internal oscillator, 110dB line rejection, extended input range, and 200µA supply in a 4-channel configuration-making it optimal for cost-sensitive, high-stability industrial DAQ where external timing components must be avoided.
Availability
LTC2404CG#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 LTC2404CG#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 semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC2404CG#PBF belongs to ADI's legacy Linear Technology precision ADC product line, designed specifically for low-power, high-accuracy sensor signal acquisition in harsh industrial and instrumentation environments.
FAQ
What is the maximum sample rate of the LTC2404CG#PBF?
The LTC2404CG#PBF achieves a maximum output rate of approximately 7.68Hz when configured for 110dB 50Hz/60Hz rejection using its internal oscillator. With an external clock (e.g., 153.6kHz), the output rate increases to 75Hz. This trade-off between rejection depth and speed is fixed by the sinc³ filter architecture and cannot be altered via software.
Does the LTC2404CG#PBF require external passive components for its oscillator?
No, the LTC2404CG#PBF does not require external passive components for oscillator operation. Its integrated oscillator provides precise timing for 50Hz or 60Hz notch filtering when the FO pin is tied to VCC or GND. External clock mode (FO driven) also requires no additional RC or crystal components-only a clean square wave source.
How does the extended input range of the LTC2404CG#PBF benefit sensor interfacing?
The LTC2404CG#PBF's extended input range of –0.125 × VREF to +1.125 × VREF allows it to accept signals beyond the nominal 0–VREF span-such as negative offsets from op-amp stages or overvoltage transients from strain gauges. This eliminates need for external level-shifting or clamping circuits, preserving SNR and simplifying front-end design.
Can the LTC2404CG#PBF operate with a 3.3V reference voltage?
Yes, the LTC2404CG#PBF supports VREF from 0.1V to VCC. At VREF = 3.3V, it maintains 4ppm INL (typical), 0.5ppm offset, and 110dB 50/60Hz rejection. Input range becomes –0.4125V to +3.7125V, constrained by absolute maximum ratings (–0.3V to VCC + 0.3V). Performance remains fully specified across this range.
Is the LTC2404CG#PBF pin-compatible with the LTC2408CG#PBF?
No, the LTC2404CG#PBF is not pin-compatible with the LTC2408CG#PBF. While both use the same 28-pin SSOP package, CH4–CH7 (Pins 13,14,15,17) are no-connect on the LTC2404CG#PBF but active inputs on the LTC2408CG#PBF. Interchanging them without PCB revision will result in unconnected channels or incorrect routing.
LTC2404CG#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:
- 0°C ~ 70°C
- Supplier Device Package:
- 28-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2404CG#PBF FAQ
1.How can I place an order for LTC2404CG#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2404CG#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 LTC2404CG#PBF reliable?
The price and inventory of LTC2404CG#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2404CG#PBF is usually 5 days.
3.What payment methods are accepted for LTC2404CG#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2404CG#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2404CG#PBF?
LTC2404CG#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2404CG#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 LTC2404CG#PBF?
For technical support, including LTC2404CG#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2404CG#PBF requirements.
6.How does Aetrix verify that LTC2404CG#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2404CG#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 LTC2404CG#PBF meets industry standards.
7.What is the process for return or replacement of LTC2404CG#PBF?
All LTC2404CG#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2404CG#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 LTC2404CG#PBF part is unused and in its original packaging.
Return procedure for LTC2404CG#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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