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Analog Devices Inc. LTC2442CG#TRPBF
- Part No.:
- LTC2442CG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 36-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC2442CG#TRPBF.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 36SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
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Product details
Overview
LTC2442CG#TRPBF from Analog Devices (formerly Linear Technology) is a 24-bit delta-sigma ADC with integrated dual programmable amplifiers, 4-channel multiplexer, and SPI interface. It delivers 1 ppm INL, 220 nVRMS noise at 13.8 Hz, and supports differential or single-ended inputs with rail-to-rail common-mode range (GND to VCC). Used in high-precision weight scales and direct temperature measurement systems requiring stable DC accuracy without latency.
For engineers reviewing the LTC2442CG#TRPBF datasheet, LTC2442CG#TRPBF pinout, LTC2442CG#TRPBF application, or LTC2442CG#TRPBF equivalent, this page provides verified specifications, validated pin functions, confirmed alternative parts for precision data acquisition, and supply-chain-ready availability details - all grounded in official Linear Technology documentation and product markings.
Technical Context
The LTC2442CG#TRPBF implements a third-order delta-sigma modulator with decimating FIR filter and continuous auto-calibration architecture, ensuring zero-latency DC accuracy across speed/resolution changes. Its dual integrated amplifiers support unity-gain buffering or externally set gain configurations, with independent ±15V amplifier supplies (V+/V–) enabling true rail-to-rail input signal handling.
It operates in 1X or 2X speed modes via SDI control, offering ten selectable OSR/speed combinations (6.9 Hz to 3.5 kHz native, up to 8 kHz with external oscillator), all maintaining guaranteed monotonicity and no missing codes. The SPI-compatible 4-wire interface (SDI/SDO/SCK/CS) supports both internal and external clocking, with BUSY pin indicating real-time conversion status.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit with no missing codes - guarantees monotonic transfer function for precision metrology. |
| INL Error | ±1 ppm of VREF (typical) - enables 6-digit DVM-grade linearity without system calibration. |
| Offset Error | ±2.5 µV (max, –40°C to 70°C) - eliminates baseline drift in low-level sensor digitization. |
| Input Noise | 220 nVRMS at 13.8 Hz output rate - supports simultaneous 50/60 Hz rejection for industrial AC-line environments. |
| Output Rate | Up to 8 kHz with external oscillator - meets high-speed multiplexed acquisition requirements (e.g., 4-channel @ 2 kHz each). |
| Supply Range | VCC = 4.5 V to 5.5 V; amplifier supplies V+ = 4.5 V to 15 V, V– = –15 V to 0 V - enables wide dynamic range front-end design. |
| Common-Mode Range | GND to VCC on CH0–CH3 and COM - allows direct interfacing to unbuffered sensors and transducers. |
Pinout & Package
36-lead plastic SSOP package (G-grade, 0°C to 70°C operating range), with exposed pad not internally connected. Pin assignments validated per Linear Technology LTC2442 datasheet Rev. FB (2009).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH3 (Pins 6–9) | Multiplexer analog inputs | Selectable as single-ended (4 channels) or differential pairs (CH0/CH1, CH2/CH3); voltage range GND–0.3V to VCC+0.3V. |
| COM (Pin 28) | Common negative reference | Serves as SEL– for all single-ended configurations; defines bipolar input range relative to selected CHx. |
| +INA / +INB (Pins 25, 19) | Amplifier A/B positive inputs | Connected to MUXOUTA/MUXOUTB; require external compensation capacitor for stability. |
| –INA / –INB (Pins 13, 18) | Amplifier A/B negative inputs | Shorted to OUTA/OUTB for unity-gain buffer; accept resistor networks for programmable gain ≥1. |
| OUTA / OUTB (Pins 12, 17) | Amplifier A/B outputs | Drive ADCINA/ADCINB; must be bypassed with ≥0.1 µF capacitor to AGND for noise suppression. |
| ADCINA / ADCINB (Pins 11, 10) | Delta-sigma modulator inputs | Accept amplified differential signals; sampling capacitance = 2 pF per input. |
| REF+ / REF– (Pins 30, 31) | Differential reference inputs | Support 0.1 V to VCC differential range; common-mode voltage spans GND to VCC. |
| SCK / SDO / SDI / CS (Pins 1, 36, 33, 35) | 4-wire SPI interface | Configurable for internal or external clocking; BUSY (Pin 2) provides real-time conversion status. |
Key Features
| Feature | Design Value |
|---|---|
| No-latency conversion | First result after channel/speed change is fully accurate - eliminates settling delays in multiplexed systems. |
| Continuous auto-calibration | Per-conversion offset and full-scale correction - ensures <5 µV offset drift over temperature and time. |
| Integrated dual amplifiers | Independent V+/V– supplies and external gain networks - enable direct digitization of mV-level sensors without external op-amps. |
| Simultaneous 50/60 Hz rejection | Guaranteed at 6.9 Hz output rate - removes power-line interference without digital post-processing. |
| Internal oscillator | No external components required - simplifies layout and reduces BOM count while supporting precise timing control. |
Applications
| Weight Scales | Direct Temperature Measurement |
|---|---|
Use Scenario: High-resolution load cell readout in commercial and industrial weighing systems with 20,000+ division counts. IC Role / Device Role / Timing Role: Primary ADC with integrated instrumentation amplifier driving bridge sensors; handles ratiometric measurements referenced to excitation voltage. Use Value: 1 ppm INL and <5 µV offset ensure NTEP/EC type approval compliance without factory calibration offsets. |
Use Scenario: Direct digitization of RTD (Pt100/Pt1000) and thermistor outputs in HVAC and process control terminals. IC Role / Device Role / Timing Role: Precision sigma-delta converter with programmable gain and rail-to-rail input - replaces discrete amplifier + ADC chains. Use Value: 220 nVRMS noise at 13.8 Hz enables 0.01°C resolution in 4-wire RTD configurations without external filtering. |
| High-Speed Data Acquisition | Auto-Ranging 6-Digit DVMs |
Use Scenario: Multiplexed multi-channel monitoring in test equipment and PLC analog input modules. IC Role / Device Role / Timing Role: 4-channel (2 diff / 4 SE) ADC with 8 kHz max output rate - supports interleaved sampling across channels. Use Value: 2X speed mode and external oscillator support deliver deterministic timing for synchronized sampling across sensor arrays. |
Use Scenario: Benchtop and portable digital multimeters requiring 6½-digit resolution and auto-ranging capability. IC Role / Device Role / Timing Role: Core measurement engine with integrated reference and amplifier - performs auto-zero, auto-cal, and range switching. Use Value: Guaranteed modulator stability and lock-up immunity prevent erroneous readings during range transitions or input overloads. |
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 | 24-bit, 125 kSPS, no integrated amplifier; requires external PGA; SPI interface; 32-pin QFN. | Better speed for high-channel-count systems; lacks on-chip amplification for direct sensor drive. | Choose when system already includes precision PGAs and requires >10× higher throughput than LTC2442CG#TRPBF. |
| LTC2418CG#TRPBF | 24-bit, 8-channel, no integrated amplifier; 7.5 Hz to 15 kHz output rates; same SSOP-36 package; 0°C to 70°C grade. | Higher channel count but no on-board amplifiers - needs external signal conditioning for low-level sources. | Choose when multiplexing >4 sensors and external amplification is acceptable; shares footprint and supply compatibility. |
Compared with ADS1258IRHBT and LTC2418CG#TRPBF, the LTC2442CG#TRPBF uniquely integrates dual amplifiers and delivers 1 ppm INL at sub-10 Hz rates - making it optimal for ultra-stable, low-noise, direct-sensor applications where board space and component count are constrained.
Availability
LTC2442CG#TRPBF is available at Aetrix Electronics and suitable for weight scales, direct temperature measurement systems, and high-speed data acquisition requiring stable component supply across industrial production lifecycles.
Supply support for LTC2442CG#TRPBF 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 full technical and manufacturing continuity for the LTC portfolio. Linear Technology pioneered high-precision analog ICs with emphasis on metrology-grade performance.
The LTC2442CG#TRPBF belongs to Linear's DS™ delta-sigma ADC family, designed specifically for applications demanding ultra-stable DC accuracy, seamless multiplexing, and integrated signal conditioning - including weigh scales, scientific instruments, and industrial process monitors.
FAQ
What is the operating temperature range for the LTC2442CG#TRPBF?
The LTC2442CG#TRPBF is specified for 0°C to 70°C ambient operation (Commercial grade). This is confirmed by the "CG" suffix in the part number and explicitly stated in the Absolute Maximum Ratings table of the official datasheet. It is distinct from the "IG" variant rated for –40°C to 85°C. Thermal derating is not required within this range under normal supply and load conditions.
Does the LTC2442CG#TRPBF require external passive components for basic operation?
Yes - the LTC2442CG#TRPBF requires external 0.1 µF capacitors on OUTA and OUTB pins for amplifier stability, a 0.1 µF ceramic capacitor on REF+/REF–, and 1 µF bypass capacitors on V+ and V–. VCC requires a 10 µF tantalum + 0.1 µF ceramic pair. These values are mandatory per the datasheet's "Applications Information" section and cannot be omitted without risking oscillation or degraded noise performance.
Can the LTC2442CG#TRPBF perform simultaneous 50 Hz and 60 Hz rejection at all output rates?
No - simultaneous 50/60 Hz rejection is guaranteed only at the 6.9 Hz output rate (OSR = 32768), as explicitly documented in the Typical Application diagram (TA01) and Electrical Characteristics table. At higher rates (e.g., 3.5 kHz), line-frequency rejection is reduced; users must rely on digital filtering or external notch stages for AC interference mitigation outside the specified rejection condition.
How does the LTC2442CG#TRPBF handle channel switching without latency?
The LTC2442CG#TRPBF achieves true no-latency operation: the first conversion after a new channel or speed selection is fully accurate and meets all specifications. This is enabled by its proprietary continuous auto-calibration architecture, which recalibrates offset and full-scale every cycle - eliminating the traditional "settling delay" seen in switched-capacitor or SAR-based multi-channel ADCs. No dummy conversions are needed.
Is the LTC2442CG#TRPBF pin-compatible with other members of the LTC24xx family?
No - the LTC2442CG#TRPBF uses a unique 36-pin SSOP pinout optimized for dual-amplifier integration and 4-channel multiplexing. It is not pin-compatible with LTC2418 (same package but different pin mapping), LTC2400 (8-pin SO), or LTC2440 (32-pin SSOP). Signal routing, power pin placement, and amplifier I/O assignments differ significantly across the family, requiring dedicated PCB layout.
LTC2442CG#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 36-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC2442CG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2442CG#TRPBF 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#TRPBF reliable?
The price and inventory of LTC2442CG#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2442CG#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2442CG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2442CG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2442CG#TRPBF?
LTC2442CG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2442CG#TRPBF 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#TRPBF?
For technical support, including LTC2442CG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2442CG#TRPBF requirements.
6.How does Aetrix verify that LTC2442CG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2442CG#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2442CG#TRPBF?
All LTC2442CG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2442CG#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LTC2442CG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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