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Analog Devices Inc. LTC2442IG#PBF
- Part No.:
- LTC2442IG#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 36-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC2442IG#PBF.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 36SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:452
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Product details
Overview
LTC2442IG#PBF from Analog Devices (formerly Linear Technology) is a 24-bit delta-sigma analog-to-digital converter with integrated dual programmable amplifiers, 4-channel multiplexing (2 differential or 4 single-ended), and selectable speed/resolution modes ranging from 6.9 Hz to 7 kHz. It delivers 1 ppm INL at unity-gain buffer configuration and supports rail-to-rail input signals via independent amplifier supplies (V+ up to +15 V, V– down to –15 V). It is used in high-precision industrial data acquisition systems requiring simultaneous 50/60 Hz rejection and no-latency conversion.
For engineers reviewing the LTC2442IG#PBF datasheet, LTC2442IG#PBF pinout, LTC2442IG#PBF application, or LTC2442IG#PBF equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts with documented differences, and supply support for long-lifecycle embedded instrumentation designs.
Technical Context
The LTC2442IG#PBF implements a third-order delta-sigma modulator with decimating FIR filter and continuous auto-calibration-ensuring stable DC accuracy without latency across all 10 speed/resolution combinations. Its dual integrated amplifiers (AMPA/AMPB) are independently configurable as unity-gain buffers or gain stages using external resistors, supporting direct sensor digitization with common-mode input range from GND to VCC.
It features a 4-wire SPI-compatible serial interface with selectable internal/external clock (via EXT pin), BUSY-driven status signaling, and 32-bit output format including sign, over/underrange flags, and 24-bit result plus 5 sub-LSBs. The device operates with internal oscillator (no external components required) or external fOSC up to 12 MHz for higher throughput.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit with no missing codes-guarantees monotonicity and full dynamic range utilization in precision measurement. |
| INL Error | ±1 ppm of VREF (typ.) at VREF = 4.096 V, VINCM = 2.048 V-enables 6½-digit DVM-grade linearity without calibration. |
| Offset Error | ±2.5 µV (max) over –40°C to 85°C-supports ultra-low-drift weigh scale and strain gauge interfaces. |
| Noise Performance | 220 nVRMS at 13.8 Hz output rate with simultaneous 50/60 Hz rejection-ideal for mains-synchronized sensor readings. |
| Output Rate Range | 6.9 Hz to 7 kHz (1X mode); up to 8 kHz with external oscillator-flexible trade-off between resolution and throughput. |
| Input Configuration | 2 differential or 4 single-ended channels with GND-to-VCC common-mode range-simplifies connection to unbuffered sensors and transducers. |
| Amplifier Supply Range | V+ = 4.5 V to 15 V; V– = –15 V to 0 V-enables true rail-to-rail bipolar input signal conditioning. |
Pinout & Package
36-lead plastic SSOP package (G package), 0.025" pitch, RoHS-compliant lead-free finish. Pin 1 indicator located at top-left corner; thermal pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH3 (Pins 6–9) | Analog Input Channels | Selectable as differential pair (CH0/CH1 or CH2/CH3) or four single-ended inputs referenced to COM (Pin 28). |
| COM (Pin 28) | Common Negative Input | Serves as SEL– for all single-ended configurations; supports input voltages from GND – 0.3 V to VCC + 0.3 V. |
| +INA / –INA (Pins 25/13), +INB / –INB (Pins 19/18) | Amplifier Inputs | Accept buffered or amplified sensor signals; shorting –INA to OUTA configures unity-gain buffer. |
| OUTA / OUTB (Pins 12/17) | Amplifier Outputs | Drive ADCINA (Pin 11) and ADCINB (Pin 10); require ≥0.1 µF compensation capacitor per amplifier. |
| ADCINA / ADCINB (Pins 11/10) | ADC Input Terminals | Receive conditioned signals from amplifiers; sampling capacitance = 2 pF each. |
| REF+ / REF– (Pins 30/31) | Differential Reference Inputs | Accept 0.1 V to VCC differential reference; common-mode range spans GND to VCC. |
| SCK / SDO / SDI / CS (Pins 1/36/33/35) | 4-Wire SPI Interface | Supports both internal clock (SCK output) and external clock (SCK input) modes via EXT pin (Pin 3). |
| V+ / V– (Pins 21/24) | Amplifier Supplies | Independent rails enable ±15 V amplifier operation; bypass with 1 µF capacitor each to AGND. |
| VCC / GND (Pins 29/4,5,32) | Power and Ground | VCC = 4.5 V to 5.5 V; three dedicated GND pins ensure low-impedance return paths for analog/digital domains. |
Key Features
| Feature | Design Value |
|---|---|
| No-latency conversion | Each output corresponds precisely to its associated conversion-even after channel/speed change-eliminating settling delays in multiplexed systems. |
| Continuous auto-calibration | Per-conversion offset and full-scale correction ensures <5 µV offset drift over temperature and supply variation. |
| Simultaneous 50/60 Hz rejection | Built-in notch filtering at 6.9 Hz output rate removes mains interference without external digital post-processing. |
| Integrated dual amplifiers | Two independent op-amps with rail-to-rail input/output simplify front-end design and reduce BOM count for multi-sensor nodes. |
| Flexible reference architecture | Differential REF+ and REF– accept any voltage between GND and VCC, enabling ratiometric or absolute reference configurations. |
Applications
| High-Precision Weigh Scales | Direct Temperature Measurement |
|---|---|
Use Scenario: Load cell outputs (mV-level, low bandwidth) are amplified and digitized in factory-floor weighing systems operating across –40°C to 85°C ambient. IC Role / Device Role / Timing Role: LTC2442IG#PBF serves as the primary sigma-delta ADC with integrated PGA, performing 24-bit digitization with 1 ppm INL and simultaneous 50/60 Hz rejection. Use Value: Eliminates need for external instrumentation amplifier and digital notch filter, reducing PCB area by >30% while maintaining NTEP Class III compliance. |
Use Scenario: Thermocouple and RTD signals are conditioned and converted in HVAC control panels where EMI immunity and long-term stability are critical. IC Role / Device Role / Timing Role: LTC2442IG#PBF acts as the sensor interface ADC, using its dual amplifiers to handle cold-junction compensation and linearization circuits. Use Value: Achieves <0.01°C measurement repeatability over 10-year field life due to <20 nV/°C offset drift and continuous on-chip calibration. |
| Industrial Data Acquisition Systems | Auto-Ranging 6-Digit DVMs |
Use Scenario: Modular DAQ modules acquire voltage, current, and resistance from multiple sensors in PLC backplanes with strict EMC requirements. IC Role / Device Role / Timing Role: LTC2442IG#PBF functions as the core ADC engine, leveraging its 4-channel mux, programmable gain, and SPI interface for host microcontroller integration. Use Value: Enables 100 kSPS aggregate throughput across 4 channels at 16-bit ENOB, meeting IEC 61000-4-3 Level 3 radiated immunity targets. |
Use Scenario: Benchtop multimeters require seamless auto-ranging, high linearity, and fast settling during range changes. IC Role / Device Role / Timing Role: LTC2442IG#PBF operates as the main digitizer, using its variable-speed architecture to switch resolution modes without latency or code glitches. Use Value: Delivers true 6½-digit performance (±1 ppm INL) with zero dead time between ranges-critical for automated test equipment calibration sequences. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7195BRUZ | 24-bit, 4.8 kHz max output rate; integrated PGA with fixed gains (1–128); no dual independent amplifiers. | Optimized for low-power, single-channel bridge sensor applications-not suited for simultaneous dual-sensor digitization. | Select AD7195BRUZ when system uses only one sensor type and requires lower power (6.5 mA vs. 13 mA) and smaller footprint (24-lead TSSOP). |
| ADS1258IPW | 24-bit, 125 kSPS max; no integrated amplifiers; requires external PGA; SPI interface with daisy-chain capability. | Targeted at high-throughput, multi-ADC synchronized systems-lacks built-in 50/60 Hz rejection and auto-calibration. | Choose ADS1258IPW when timing-critical distributed sensing demands deterministic latency and external amplifier flexibility outweighs integration benefits. |
Compared with AD7195BRUZ and ADS1258IPW, the LTC2442IG#PBF uniquely combines dual independent programmable amplifiers, simultaneous 50/60 Hz rejection, and no-latency multiplexing-making it irreplaceable in compact, multi-sensor industrial instruments where board space and calibration overhead are constrained.
Availability
LTC2442IG#PBF is available at Aetrix Electronics and suitable for high-precision weigh scales, industrial data acquisition systems, and auto-ranging 6-digit DVMs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2442IG#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors for precision instrumentation and industrial control.
The LTC2442IG#PBF belongs to Linear's DS™ (Delta-Sigma) ADC product line, designed specifically for applications demanding ultra-stable DC accuracy, integrated signal conditioning, and simplified system-level calibration-targeting test & measurement, process control, and scientific instrumentation.
FAQ
What is the operating temperature range for the LTC2442IG#PBF?
The LTC2442IG#PBF is rated for operation from –40°C to +85°C, as confirmed in the Absolute Maximum Ratings table and Order Information section. This extended industrial temperature grade distinguishes it from the commercial-grade LTC2442CG#PBF (0°C to 70°C) and enables deployment in harsh environments such as factory automation cabinets and outdoor metering enclosures where ambient temperatures fluctuate widely.
Does the LTC2442IG#PBF require external passive components for basic operation?
Yes-the LTC2442IG#PBF requires external 0.1 µF ceramic capacitors on REF+, REF–, and each amplifier output (OUTA, OUTB), plus 1 µF bypass capacitors on V+ and V–, and a 10 µF tantalum + 0.1 µF ceramic pair on VCC. These are explicitly specified in the Applications Information and Pin Functions sections for stability, noise reduction, and proper amplifier compensation; omission risks oscillation or degraded INL.
How does the LTC2442IG#PBF achieve simultaneous 50 Hz and 60 Hz rejection?
The LTC2442IG#PBF achieves simultaneous 50/60 Hz rejection through inherent notch filtering in its delta-sigma modulator architecture when operated at the 6.9 Hz output rate (OSR = 32768). This is not a post-processing feature-it is a hardware-level property of the modulator's transfer function, verified in Typical Performance Characteristics (Figure 242 G02–G05) and explicitly stated in the FEATURES list. No firmware or external filter is needed.
Can the LTC2442IG#PBF operate with a single 5 V supply for both logic and analog sections?
Yes-the LTC2442IG#PBF supports VCC = 4.5 V to 5.5 V for digital logic and ADC core, while its dual amplifiers accept independent V+ and V– supplies. For single-supply operation, tie V+ to VCC (5 V) and V– to GND; however, note that input common-mode range then becomes limited to GND–0.3 V to VCC+0.3 V, and full rail-to-rail differential input requires split supplies (e.g., V+ = +5 V, V– = –5 V).
What is the meaning of "no latency" in the LTC2442IG#PBF datasheet?
"No latency" means that every conversion result output by the LTC2442IG#PBF corresponds exactly to the analog input sampled during that conversion cycle-even immediately after changing channels or speed/resolution settings. Unlike many delta-sigma ADCs requiring filter settling time, the LTC2442IG#PBF guarantees validity of the first conversion following any configuration change, as confirmed in the DESCRIPTION and APPLICATIONS INFORMATION sections.
LTC2442IG#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 36-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 24
- Sampling Rate (Per Second):
- 8k
- Number of Inputs:
- 2, 4
- Input Type:
- Differential, 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:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 36-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2442IG#PBF FAQ
1.How can I place an order for LTC2442IG#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2442IG#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 LTC2442IG#PBF reliable?
The price and inventory of LTC2442IG#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2442IG#PBF is usually 5 days.
3.What payment methods are accepted for LTC2442IG#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2442IG#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2442IG#PBF?
LTC2442IG#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2442IG#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 LTC2442IG#PBF?
For technical support, including LTC2442IG#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2442IG#PBF requirements.
6.How does Aetrix verify that LTC2442IG#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2442IG#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 LTC2442IG#PBF meets industry standards.
7.What is the process for return or replacement of LTC2442IG#PBF?
All LTC2442IG#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2442IG#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 LTC2442IG#PBF part is unused and in its original packaging.
Return procedure for LTC2442IG#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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