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Analog Devices Inc. LTC2424IG#PBF
- Part No.:
- LTC2424IG#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC2424IG#PBF.pdf
- Description:
- IC ADC 20BIT SIGMA-DELTA 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,749
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Product details
Overview
LTC2424IG#PBF 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 and 1.2ppm RMS noise - ideal for high-precision industrial sensor interfaces requiring stable DC measurements under noisy AC line conditions.
For engineers reviewing the LTC2424IG#PBF datasheet, LTC2424IG#PBF pinout, LTC2424IG#PBF application, or LTC2424IG#PBF equivalent, key selection criteria include its single-cycle filter settling, 50/60Hz notch rejection ≥110dB, flexible 4-wire SPI/MICROWIRE interface, and compatibility with external or internal clock sources for configurable rejection frequencies from 1Hz to 800Hz.
Technical Context
The LTC2424IG#PBF implements a decimating FIR filter synchronized to an on-chip oscillator or user-supplied external clock, enabling deterministic 110dB rejection at 50Hz or 60Hz ±2% without external components. Its auto-calibrating architecture performs full-scale and offset correction every conversion cycle, ensuring long-term stability across temperature and supply voltage variations.
It integrates a 4-channel analog multiplexer with live-zero input range (–0.125×VREF to 1.125×VREF), allowing seamless interfacing with sensors exhibiting offset/gain drift or overrange output. The 24-bit serial output includes 4 status bits followed by 20-bit conversion data, MSB-first, with SDO active-low enable via CSADC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 20-bit, no missing codes - guarantees monotonicity and full dynamic range utilization in precision measurement systems. |
| INL | 8ppm max (VREF = 5V) - enables ≤0.0008% full-scale error in 4½-digit DVMs and strain-gage transducer readouts. |
| RMS Noise | 1.2ppm of VREF - supports sub-1µV resolution with 5V reference, critical for low-level thermocouple or bridge sensor signals. |
| Power Supply | 2.7V to 5.5V - allows direct operation from common industrial rails (3.3V, 5V) without LDO overhead. |
| Supply Current | 200µA (conversion), 20µA (sleep) - enables battery-powered portable instrumentation with multi-year runtime. |
| Line Rejection | ≥110dB at 50Hz/60Hz ±2% - eliminates need for external analog notch filters in weigh scales and process controllers. |
| Input Range | –0.125×VREF to 1.125×VREF - accommodates sensor offsets up to ±12.5% FS without clipping or manual zero adjustment. |
Pinout & Package
Package: 28-lead plastic SSOP (G package), 5.6mm × 10.2mm, 0.635mm pitch, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1,6,16,18,22,27,28) | Ground reference | Multi-point grounding required for low-noise analog performance; pins must connect directly to ground plane. |
| VCC (Pins 2,8) | Positive supply | 2.7V–5.5V operation; requires local 10µF tantalum + 0.1µF ceramic bypassing per pin. |
| FSSET (Pin 3) | Full-scale reference input | Defines top of conversion range; VIN = FSSET yields FFFFFH output code. |
| ADCIN (Pin 4) | Analog input node | Accepts mux output (MUXOUT); input range extends beyond rail-to-rail due to internal charge redistribution. |
| ZSSET (Pin 5) | Zero-scale reference input | Defines bottom of conversion range; VIN = ZSSET yields 00000H; must be grounded for LTC2404/LTC2408 drop-in compatibility. |
| MUXOUT (Pin 7) | Multiplexer output | Connects selected channel (CH0–CH3) to ADCIN; tied directly to ADCIN in standard configuration. |
| CH0–CH3 (Pins 9–12) | Analog channel inputs | Four differential-capable single-ended inputs; CH4–CH7 are no-connect on LTC2424IG#PBF. |
| FO (Pin 26) | Filter oscillator control | FO = GND → 60Hz notch; FO = VCC → 50Hz notch; FO = external clock → programmable notch at fEOSC/2560. |
| CSADC (Pin 23) | ADC chip select | Active-low enable for SDO output and conversion initiation; high state forces sleep mode (20µA). |
| SDO (Pin 24) | Serial data output | Three-state 24-bit output (4 status + 20 data bits), MSB-first; valid on falling edge of SCK. |
| SCK (Pin 25) | Serial clock output | Internally generated clock (19.2kHz) during data transfer; used as SCK input when external clock mode enabled. |
Key Features
| Feature | Design Value |
|---|---|
| No-latency delta-sigma conversion | First result after channel change is valid - eliminates dead time in multiplexed sensor arrays and enables real-time channel scanning. |
| Auto-calibration per conversion | Continuous offset and full-scale correction ensures <0.04ppm/°C drift and immunity to supply ripple or thermal gradients. |
| Extended input range | –12.5% to +112.5% of VREF accommodates pre-amplifier offsets and sensor overrange without external level-shifting circuitry. |
| Configurable 50/60Hz rejection | Single-pin FO selection enables field-deployable adaptation to regional AC line standards without hardware change. |
| Low-power sleep mode | 20µA quiescent current with indefinite result retention in shift register - ideal for duty-cycled wireless sensor nodes. |
Applications
| Weight Scales | Direct Temperature Measurement |
|---|---|
Use Scenario: High-resolution load cell readout in commercial bench scales with 10,000+ count resolution and AC mains noise immunity. IC Role / Device Role / Timing Role: Primary 20-bit ADC capturing mV-level bridge outputs; uses internal 60Hz notch to suppress 60Hz pickup in unshielded environments. Use Value: Eliminates need for external chopper-stabilized op-amps or analog filters, reducing BOM cost and PCB area while maintaining ±0.001% linearity. |
Use Scenario: Precision RTD or thermistor measurement in HVAC controllers where ambient temperature drift must be minimized. IC Role / Device Role / Timing Role: Digitizes conditioned sensor voltage with live-zero input range to absorb amplifier offset; auto-calibration maintains accuracy over –40°C to 85°C. Use Value: Enables direct connection to 3-wire RTD bridges without external zero-adjust potentiometers or calibration tables. |
| Gas Analyzers | Strain-Gage Transducers |
Use Scenario: Low-power electrochemical gas sensor signal conditioning in portable air quality monitors with battery life >2 years. IC Role / Device Role / Timing Role: 20-bit digitizer for nA-level current outputs; operates in sleep mode between readings to minimize average current. Use Value: 200µA active current and 20µA sleep current extend battery life while preserving 16-bit effective resolution at 100sps fast mode. |
Use Scenario: Industrial hydraulic pressure transducer with millivolt-per-bar output and wide operating temperature range. IC Role / Device Role / Timing Role: Front-end ADC accepting ±10mV bridge signals; uses extended input range to handle ±2mV offset drift from temperature cycling. Use Value: Removes requirement for manual null-trim circuitry and enables factory calibration once, with lifetime stability guaranteed by on-chip calibration. |
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#PBF | 8-channel version in same 28-SSOP package; identical specs except adds CH4–CH7 pins (non-no-connect). | Supports larger sensor arrays without board redesign; requires updated channel addressing logic. | Select when future expansion to >4 channels is anticipated or existing layout accommodates 8 inputs. |
| ADS1248IPWR | Texas Instruments 24-bit ADC; higher resolution but 350µA typical supply current, no integrated 50/60Hz notch, requires external reference. | Better resolution for ultra-low-noise applications; lacks single-pin line-frequency rejection and live-zero input range. | Choose when 24-bit resolution outweighs power and ease-of-use trade-offs, and external notch filtering is acceptable. |
Compared with LTC2424IG#PBF, LTC2428IG#PBF offers immediate channel scalability within identical footprint and power envelope, while ADS1248IPWR trades deterministic line-rejection and micropower operation for higher raw resolution - making LTC2424IG#PBF optimal for cost-sensitive, battery-powered, or AC-noise-prone industrial sensing.
Availability
LTC2424IG#PBF is available at Aetrix Electronics and suitable for weight scales, direct temperature measurement, gas analyzers, strain-gage transducers, and industrial process control requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC2424IG#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 LTC2424IG#PBF belongs to ADI's µPower Delta-Sigma ADC product line, engineered specifically for high-accuracy, low-power sensor signal acquisition in harsh industrial environments where line-frequency interference, thermal drift, and battery constraints dominate design requirements.
FAQ
What is the operating temperature range of the LTC2424IG#PBF?
The LTC2424IG#PBF is specified for operation from –40°C to +85°C (Industrial grade). This range is confirmed in the Absolute Maximum Ratings table and applies to all electrical specifications unless otherwise noted. The "I" suffix in LTC2424IG#PBF explicitly denotes this industrial temperature grade, distinguishing it from the commercial-grade LTC2424CG#PBF (0°C to 70°C).
Does the LTC2424IG#PBF require external passive components for its internal oscillator?
No, the LTC2424IG#PBF requires no external passive components for its internal oscillator. As stated in the datasheet features and Applications Information section, the on-chip oscillator eliminates the need for crystals, resonators, or timing capacitors - enabling true single-chip 20-bit ADC functionality with minimal external BOM.
Can the LTC2424IG#PBF interface directly with a 3.3V microcontroller SPI bus?
Yes, the LTC2424IG#PBF supports 3.3V logic levels: VIH is 2.0V min for VCC ≤ 3.3V, and VOL is 0.4V max at 1.6mA sink, meeting standard SPI voltage thresholds. Its SDO output is three-state and CSADC-controlled, allowing safe sharing of MISO lines. No level-shifting is required when VCC = 3.3V.
How does the LTC2424IG#PBF achieve "no latency" in multiplexed operation?
The LTC2424IG#PBF achieves no-latency operation through deterministic single-cycle digital filter settling. Unlike conventional delta-sigma ADCs that require multiple conversions to settle after channel changes, the LTC2424IG#PBF's decimating FIR filter completes settling within one conversion period - so the first result after switching CH0→CH1 is fully accurate and corresponds to CH1.
Is the LTC2424IG#PBF pin-compatible with the LTC2404/LTC2408 family?
Yes, the LTC2424IG#PBF is pin-compatible with the LTC2404/LTC2408 when ZSSET (Pin 5) is grounded. The datasheet explicitly states interchangeability and provides timing diagrams confirming identical SCK/CSADC behavior. However, LTC2424IG#PBF outputs 24-bit words versus 32-bit on LTC2404/LTC2408, with last 8 bits padded high for drop-in software compatibility.
LTC2424IG#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:
- 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#PBF FAQ
1.How can I place an order for LTC2424IG#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2424IG#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 LTC2424IG#PBF reliable?
The price and inventory of LTC2424IG#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2424IG#PBF is usually 5 days.
3.What payment methods are accepted for LTC2424IG#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2424IG#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2424IG#PBF?
LTC2424IG#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2424IG#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 LTC2424IG#PBF?
For technical support, including LTC2424IG#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2424IG#PBF requirements.
6.How does Aetrix verify that LTC2424IG#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2424IG#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 LTC2424IG#PBF meets industry standards.
7.What is the process for return or replacement of LTC2424IG#PBF?
All LTC2424IG#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2424IG#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 LTC2424IG#PBF part is unused and in its original packaging.
Return procedure for LTC2424IG#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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