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Analog Devices Inc. LTC2442CG#PBF
- Part No.:
- LTC2442CG#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 36-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC2442CG#PBF.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 36SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,010
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Product details
Overview
LTC2442CG#PBF from Analog Devices (formerly Linear Technology) is a 24-bit delta-sigma ADC with integrated dual programmable amplifiers, 4-channel multiplexing (2 differential or 4 single-ended), and selectable speed/resolution modes up to 3.5kHz output rate. It delivers 1ppm INL, <5µV offset, and 220nVRMS noise at 13.8Hz - enabling high-precision direct sensor digitization in industrial instrumentation and weigh scales.
For engineers reviewing the LTC2442CG#PBF datasheet, LTC2442CG#PBF pinout, LTC2442CG#PBF application, or LTC2442CG#PBF equivalent, key selection criteria include guaranteed no-latency operation after channel/speed changes, simultaneous 50Hz/60Hz rejection at 6.9Hz, rail-to-rail input support via ±15V amplifier supplies, and SPI-compatible 4-wire interface with BUSY/EOC status signaling.
Technical Context
The LTC2442CG#PBF implements a third-order delta-sigma modulator with decimating FIR filter and continuous auto-calibration - ensuring stable DC accuracy without external calibration or settling delays. Its dual independent amplifiers (AMPA/AMPB) support unity-gain buffering or user-defined gain via external resistors, with V+ and V– pins rated for ±15V supplies.
Conversion timing is controlled by internal oscillator (default) or external clock up to 12MHz on FO pin; speed/resolution is selected via SDI command (OSR = 256 to 32768), enabling 10 distinct combinations from 6.9Hz/220nVRMS to 3.5kHz/25µVRMS - all with zero latency and guaranteed first-conversion validity after reconfiguration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit with no missing codes - guarantees monotonicity and full-scale fidelity across entire input range. |
| INL Error | ±1 ppm of VREF (typical) - enables 16-bit+ effective linearity without post-calibration in precision measurement systems. |
| Offset Error | <5 µV (–40°C to 85°C) - eliminates need for system-level offset trimming in low-drift applications. |
| Input Noise | 220 nVRMS at 13.8 Hz - supports 24-bit resolution for slow-varying signals like strain gauges or thermocouples. |
| Output Rate | Up to 3.5 kHz (1X mode) or 7 kHz (2X mode) - allows real-time monitoring of dynamic analog inputs without aliasing. |
| Common Mode Range | GND to VCC on CH0–CH3/COM - simplifies interfacing with single-supply sensors and industrial transducers. |
| Reference Input | Differential REF+/REF–, 0.1V to VCC - supports flexible reference sourcing including ratiometric or precision voltage references. |
Pinout & Package
36-lead plastic SSOP package (G-grade, 0°C to 70°C operating range), with dedicated analog/digital ground pins (AGND/DGND), dual amplifier supply rails (V+/V–), and fully isolated signal paths for high PSRR and CMRR performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH3 | Multiplexer analog inputs | Selectable as single-ended (vs COM) or differential pairs - supports 4 SE or 2 DE configurations without external switching. |
| ADCINA / ADCINB | ADC analog inputs | Fixed connection points from amplifier outputs - ensures minimal parasitic capacitance and preserves SNR. |
| +INA / –INA / +INB / –INB | Amplifier A/B inputs | Enable unity-gain buffer (short –IN to OUT) or programmable gain - eliminates need for external op-amp stages. |
| OUTA / OUTB | Amplifier A/B outputs | Require ≥0.1µF compensation capacitor - stabilizes gain stage and prevents oscillation under varying load conditions. |
| REF+ / REF– | Differential reference inputs | Accept 0.1V–VCC differential voltage - enables ratiometric sensing or high-accuracy external reference integration. |
| SCK / SDO / SDI / CS / BUSY | 4-wire SPI interface | Compatible with standard microcontroller GPIOs - BUSY provides hardware-ready signal; EOC bit enables interrupt-driven readout. |
| V+ / V– | Amplifier supply rails | Support ±15V operation - permits rail-to-rail input signals beyond VCC/GND, critical for industrial ±10V sensor interfaces. |
Key Features
| Feature | Design Value |
|---|---|
| No-latency conversion | First result after channel/speed change is fully accurate - eliminates dead time and enables true high-speed multiplexed acquisition. |
| Simultaneous 50/60Hz rejection | Guaranteed at 6.9Hz output rate - removes power-line interference without software filtering or additional components. |
| Integrated dual amplifiers | Configurable as buffers or gain stages - reduces BOM count and PCB area vs discrete op-amp + ADC solutions. |
| Continuous auto-calibration | Per-conversion offset/full-scale correction - maintains stability over temperature, supply variation, and time without user intervention. |
| Internal oscillator | No external crystal or clock required - simplifies layout and lowers system cost while supporting precise timing control. |
Applications
| High-Precision Weigh Scales | Direct Thermocouple Measurement |
|---|---|
Use Scenario: Digital weight display in platform scales using 350Ω strain gauge bridges with mV-level output. IC Role / Device Role / Timing Role: ADC front-end with integrated PGA buffers - digitizes bridge output directly, rejecting common-mode noise and 50/60Hz interference. Use Value: Achieves ≤1ppm INL and <5µV offset drift over 0°C–70°C - enables 100,000-count readability without recalibration. |
Use Scenario: Cold-junction compensated thermocouple readout in industrial process controllers. IC Role / Device Role / Timing Role: Precision ADC with rail-to-rail input support - accepts ±10mV K-type TC output and cold-junction voltage simultaneously. Use Value: 220nVRMS noise at 13.8Hz enables 0.01°C resolution; integrated amplifiers eliminate external instrumentation amps. |
| Automated Test Equipment (ATE) | High-Speed Data Acquisition Systems |
Use Scenario: Multi-channel voltage/current measurement module in benchtop DMMs and calibrators. IC Role / Device Role / Timing Role: 4-channel multiplexed ADC with no-latency mode - switches between channels and updates readings within one conversion cycle. Use Value: 3.5kHz output rate and 10 selectable OSR modes allow adaptive sampling - balances speed and resolution per channel dynamically. |
Use Scenario: Real-time vibration analysis in predictive maintenance systems using piezoelectric accelerometers. IC Role / Device Role / Timing Role: High-speed delta-sigma converter with 2X mode - captures transient events at up to 7kHz with 24-bit fidelity. Use Value: Simultaneous 50/60Hz rejection suppresses mains coupling; internal oscillator ensures jitter-free timing without external clock routing. |
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 |
|---|---|---|---|
| ADS1258IRHBT | 8-channel, 24-bit, 125kSPS max; no integrated amplifiers; requires external PGA or driver. | Better suited for high-channel-count, lower-precision systems where external signal conditioning is already present. | Choose ADS1258IRHBT when channel density >4 is required and system-level amplification exists. |
| MAX11206ETL+ | Single-channel, 24-bit, 10SPS–2.5kSPS; integrated PGA with 1–128 gain; smaller 20-pin TQFN package. | Optimized for space-constrained, single-sensor applications like portable medical devices or battery-powered loggers. | Choose MAX11206ETL+ when only one sensor channel is needed and board area is critical. |
Compared with ADS1258IRHBT and MAX11206ETL+, the LTC2442CG#PBF uniquely combines dual integrated amplifiers, 4-channel flexibility, and guaranteed no-latency reconfiguration - making it optimal for multi-sensor industrial systems requiring both precision and adaptability without added signal-chain complexity.
Availability
LTC2442CG#PBF is available at Aetrix Electronics and suitable for high-precision weigh scales, industrial process controllers, and automated test equipment requiring stable component supply across extended production lifecycles.
Supply support for LTC2442CG#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 acquired Linear Technology in 2017 and maintains its legacy of ultra-precision analog ICs. The company specializes in signal chain solutions for demanding measurement and control applications.
The LTC2442CG#PBF belongs to Linear's DS™ delta-sigma ADC family, designed specifically for high-resolution, low-drift data acquisition in industrial, scientific, and metrology systems where DC accuracy and long-term stability are critical.
FAQ
What is the operating temperature range for the LTC2442CG#PBF?
The LTC2442CG#PBF is specified for 0°C to 70°C ambient operation. This commercial-grade temperature range aligns with industrial control panels, laboratory instruments, and factory-floor test equipment where environmental control is maintained. The device maintains <5µV offset and ±1ppm INL across this full range, verified by production testing per Linear Technology's datasheet specifications.
Does the LTC2442CG#PBF require external clocking components?
No, the LTC2442CG#PBF includes an internal oscillator and operates fully functional with no external clock components. The FO pin can be tied to GND or VCC to select internal clock mode; external clocking (up to 12MHz) is optional and used only when higher output rates or synchronization with system clocks is required. Internal oscillator operation simplifies design and improves timing robustness.
How does the LTC2442CG#PBF handle input overrange and underrange conditions?
The LTC2442CG#PBF uses dedicated status bits (Bit 29 and Bit 28) in its 32-bit output stream to indicate overrange (VIN > +0.5•VREF) or underrange (VIN < –0.5•VREF). These conditions generate unique output codes distinct from valid conversions - enabling firmware to detect saturation without additional analog comparators or threshold monitoring circuits.
Can the LTC2442CG#PBF interface directly with a microcontroller GPIO without level-shifting?
Yes - the LTC2442CG#PBF digital I/O (CS, SDI, SDO, SCK, BUSY) operates at VCC-compatible logic levels (VIH = 2.5V min, VOL = 0.4V max at 1.6µA), matching standard 3.3V or 5V microcontrollers. No level-shifting is required when VCC = 4.5V–5.5V. All digital pins tolerate voltages from –0.3V to VCC + 0.3V, providing robustness against transient coupling.
What is the purpose of the V+ and V– pins on the LTC2442CG#PBF?
The V+ and V– pins supply independent power to the two integrated amplifiers (AMPA and AMPB). They support voltages from –15V to +15V relative to GND, enabling true rail-to-rail input operation beyond the VCC/GND range - essential for interfacing with ±10V industrial sensors or bipolar transducer outputs without external level-shifting circuitry.
LTC2442CG#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:
- 0°C ~ 70°C
- Supplier Device Package:
- 36-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2442CG#PBF FAQ
1.How can I place an order for LTC2442CG#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2442CG#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 LTC2442CG#PBF reliable?
The price and inventory of LTC2442CG#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2442CG#PBF is usually 5 days.
3.What payment methods are accepted for LTC2442CG#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2442CG#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2442CG#PBF?
LTC2442CG#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2442CG#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 LTC2442CG#PBF?
For technical support, including LTC2442CG#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2442CG#PBF requirements.
6.How does Aetrix verify that LTC2442CG#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2442CG#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 LTC2442CG#PBF meets industry standards.
7.What is the process for return or replacement of LTC2442CG#PBF?
All LTC2442CG#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2442CG#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 LTC2442CG#PBF part is unused and in its original packaging.
Return procedure for LTC2442CG#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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