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Analog Devices Inc. LTC2442IG#TRPBF
- Part No.:
- LTC2442IG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 36-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC2442IG#TRPBF.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 36SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,281
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Product details
Overview
LTC2442IG#TRPBF 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 ranging from 6.9 Hz to 7 kHz. It delivers 1 ppm INL, <5 µV offset, and 220 nVRMS noise at 13.8 Hz - enabling high-precision direct sensor digitization in industrial instrumentation and weigh scales.
For engineers reviewing the LTC2442IG#TRPBF datasheet, LTC2442IG#TRPBF pinout, LTC2442IG#TRPBF application, or LTC2442IG#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed operating modes (internal/external oscillator, 1X/2X speed), real-world application constraints (e.g., V+ ≥ VINMAX + 2 V), and two rigorously cross-checked alternative parts for precision data acquisition systems.
Technical Context
The LTC2442IG#TRPBF 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 (e.g., 6.9 Hz/220 nVRMS to 3.5 kHz/25 µVRMS). Its dual integrated amplifiers support unity-gain buffering or externally set gain configurations, with independent ±15 V amplifier supplies (V+/V–) enabling rail-to-rail input signal handling.
It features a 4-wire SPI-compatible interface (SDI/SDO/SCK/CS), BUSY status indicator, and flexible clocking: internal oscillator (no external components) or external fOSC up to 12 MHz. Channel selection, speed/resolution, and 2X mode are controlled via 32-bit SDI command with no configuration registers required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit with no missing codes - guarantees monotonicity and full-scale fidelity for metrology-grade measurements. |
| INL Error | ±1 ppm of VREF (typical) - enables 1 ppm linearity in unity-gain buffer mode, critical for 6½-digit DVMs. |
| Offset Error | <5 µV (–40°C to 85°C) - eliminates need for system-level offset trimming in high-stability applications. |
| Noise Density | 220 nVRMS at 13.8 Hz output rate - supports simultaneous 50/60 Hz rejection without external filtering. |
| Output Rate Range | 6.9 Hz to 7 kHz (1X mode); up to 8 kHz with external oscillator - allows dynamic trade-off between resolution and throughput. |
| Input Configuration | 2 differential or 4 single-ended channels with GND-to-VCC common-mode range - simplifies sensor interfacing without level-shifting. |
| Amplifier Supplies | V+ = 4.5 V to 15 V; V– = –15 V to 0 V - supports bipolar input signals beyond supply rails (e.g., ±10 V sensors). |
Pinout & Package
36-lead plastic SSOP (G package), 0.025" pitch, RoHS-compliant lead-free finish. Pin 1 identifier marked on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH3 (Pins 6–9) | Multiplexer analog inputs | Selectable as differential pair (CH0/CH1 or CH2/CH3) or four single-ended inputs referenced to COM. |
| 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) | Amplifier A differential inputs | +INA tied to MUXOUTA; –INA shorted to OUTA for unity gain or configured with external resistors for gain >1. |
| OUTA (Pin 12) | Amplifier A output | Drives ADCINA (Pin 11); requires ≥0.1 µF compensation capacitor to ground for stability. |
| ADCINA (Pin 11) | ADC channel A input | Accepts amplified signal from OUTA; sampling capacitance = 2 pF - minimizes charge injection error. |
| REF+ / REF– (Pins 30/31) | Differential reference inputs | Support 0.1 V to VCC differential range; common-mode voltage spans GND to VCC - enables ratiometric or isolated references. |
| SDI / SDO / SCK / CS (Pins 33/36/1/35) | 4-wire SPI interface | SDI configures next conversion; SDO outputs 32-bit frame (status + 24-bit result + sub-LSBs); no setup/hold registers needed. |
| BUSY (Pin 2) | Conversion status indicator | Active-HIGH during conversion; goes LOW when result is ready - usable as hardware interrupt for microcontrollers. |
Key Features
| Feature | Design Value |
|---|---|
| No-latency 1X mode | First conversion after channel/speed change is fully accurate - eliminates settling delays in multiplexed high-speed acquisition. |
| Continuous auto-calibration | Per-conversion offset and full-scale calibration ensures <5 µV offset drift over temperature and time - no manual recalibration required. |
| Integrated dual amplifiers | Configurable as unity-gain buffers or externally gain-set stages - enables direct connection of high-Z sensors (e.g., strain gauges, RTDs) without external op-amps. |
| Simultaneous 50/60 Hz rejection | Guaranteed at 6.9 Hz output rate - removes mains interference without notch filters or firmware averaging. |
| Flexible clock architecture | Internal oscillator (no external parts) or external fOSC up to 12 MHz - supports precise timing control in noise-sensitive environments. |
Applications
| Industrial Weigh Scales | High-Precision DVMs |
|---|---|
Use Scenario: Digitizing mV-level outputs from load cell bridges under varying temperature and EMI conditions. IC Role / Device Role / Timing Role: LTC2442IG#TRPBF serves as the primary sigma-delta ADC with integrated PGA, performing ratiometric measurement against bridge excitation voltage. Use Value: 220 nVRMS noise at 13.8 Hz and simultaneous 50/60 Hz rejection enable 1 µV resolution without external filtering or digital post-processing. |
Use Scenario: Building 6½-digit bench DVMs requiring guaranteed monotonicity and <1 ppm linearity over full scale. IC Role / Device Role / Timing Role: LTC2442IG#TRPBF acts as the core measurement engine, using its internal 4.096 V reference and auto-ranging capability to maintain resolution across ranges. Use Value: ±1 ppm INL (typical) and no missing codes ensure traceable metrology-grade accuracy compliant with IEC 61000-4-30 Class A requirements. |
| Direct Temperature Measurement | High-Speed Data Acquisition |
Use Scenario: Measuring Pt100/1000 RTD resistance changes in process control transmitters with 0.01 °C resolution. IC Role / Device Role / Timing Role: LTC2442IG#TRPBF interfaces directly to 4-wire RTD with constant-current excitation, using its differential inputs and integrated amplifiers to reject lead-wire resistance errors. Use Value: GND-to-VCC common-mode input range and <5 µV offset allow direct Kelvin sensing without level-shifting circuitry or calibration offsets. |
Use Scenario: Capturing transient waveforms from vibration sensors or acoustic transducers at rates up to 7 kHz with 24-bit fidelity. IC Role / Device Role / Timing Role: LTC2442IG#TRPBF operates in 2X speed mode with external 12 MHz oscillator, delivering 8 kHz output rate while maintaining 25 µVRMS noise floor. Use Value: One-cycle latency in 2X mode and seamless speed switching enable real-time adaptive sampling without data gaps or phase discontinuities. |
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 |
|---|---|---|---|
| ADS1256IDBT | 24-bit, 30 kSPS max, single-ended only, no integrated amplifiers, requires external PGA for sensor interfacing. | Best suited for PCB space-constrained designs where external signal conditioning is already present. | Select ADS1256IDBT when system-level amplification exists and higher throughput (>7 kHz) is required - but expect added BOM cost and layout complexity for external gain stages. |
| AD7195BRUZ | 24-bit, 4.8 kSPS max, integrated PGA (1–128×), 50/60 Hz rejection, but only 2 differential/4 pseudo-differential inputs (no true single-ended). | Ideal for low-power, low-noise weigh scale and pressure sensor front-ends with fixed gain requirements. | Choose AD7195BRUZ for ultra-low power (<1 mA ICC) and factory-calibrated PGA gain - but verify COM pin limitations if true single-ended operation with independent references is needed. |
Compared with ADS1256IDBT and AD7195BRUZ, the LTC2442IG#TRPBF uniquely combines dual independent amplifiers, true 4-channel single-ended support, and 8 kHz external-clock operation - making it optimal for flexible, high-fidelity sensor digitization where board space permits discrete amplifier decoupling and layout control.
Availability
LTC2442IG#TRPBF is available at Aetrix Electronics and suitable for industrial instrumentation, precision test equipment, and embedded metrology systems requiring stable component supply across extended temperature ranges (–40°C to 85°C) and long production lifecycles.
Supply support for LTC2442IG#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, 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 LTC2442IG#TRPBF belongs to ADI's legacy Linear Technology precision delta-sigma ADC product line, engineered specifically for metrology-grade data acquisition systems demanding zero-latency multiplexing, integrated signal conditioning, and guaranteed DC accuracy without calibration overhead.
FAQ
What is the maximum output data rate achievable with the LTC2442IG#TRPBF?
The LTC2442IG#TRPBF achieves up to 8 kHz output rate when configured in 2X speed mode with an external oscillator (fOSC = 12 MHz). In 1X mode with internal oscillator, the maximum is 7 kHz. These rates maintain full 24-bit resolution and guaranteed 25 µVRMS noise performance - verified across the –40°C to 85°C operating range specified for the LTC2442IG#TRPBF.
Does the LTC2442IG#TRPBF require external components for basic operation?
No external components are required for basic operation of the LTC2442IG#TRPBF when using its internal oscillator and unity-gain amplifier configuration. Only three mandatory bypass capacitors are needed: 10 µF + 0.1 µF on VCC (Pin 29), 1 µF on V+ (Pin 21), and 1 µF on V– (Pin 24). The 0.1 µF compensation capacitors on OUTA/OUTB (Pins 12/17) are required for amplifier stability per the LTC2442IG#TRPBF datasheet.
How does the LTC2442IG#TRPBF handle input overrange and underrange conditions?
The LTC2442IG#TRPBF uses dedicated status bits (Bit 29 and Bit 28) in its 32-bit output frame to indicate overrange (VIN > +0.5•VREF) and underrange (VIN < –0.5•VREF) conditions. These produce unique, non-overlapping output codes distinct from valid conversions - enabling robust fault detection in safety-critical applications without additional external comparators or firmware checks.
Can the LTC2442IG#TRPBF operate with a 3.3 V supply?
No - the LTC2442IG#TRPBF requires VCC between 4.5 V and 5.5 V per its Absolute Maximum Ratings and Electrical Characteristics tables. Operating below 4.5 V violates specification and risks improper amplifier biasing, modulator instability, and invalid conversion results. For 3.3 V systems, level-shifting or a compatible 3.3 V ADC (e.g., AD717x series) must be used instead of the LTC2442IG#TRPBF.
What is the guaranteed integral nonlinearity (INL) specification for the LTC2442IG#TRPBF over temperature?
The LTC2442IG#TRPBF guarantees ±2 ppm of VREF INL over its full operating temperature range (–40°C to 85°C) when configured with REF+ = 4.096 V, REF– = GND, and VINCM = 2.048 V - matching the conditions shown in Figure TA02 of the official datasheet. This value is measured and tested, not just typical, and applies to both differential and single-ended input modes.
LTC2442IG#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:
- -40°C ~ 85°C
- Supplier Device Package:
- 36-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2442IG#TRPBF FAQ
1.How can I place an order for LTC2442IG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2442IG#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 LTC2442IG#TRPBF reliable?
The price and inventory of LTC2442IG#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2442IG#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2442IG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2442IG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2442IG#TRPBF?
LTC2442IG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2442IG#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 LTC2442IG#TRPBF?
For technical support, including LTC2442IG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2442IG#TRPBF requirements.
6.How does Aetrix verify that LTC2442IG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2442IG#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 LTC2442IG#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2442IG#TRPBF?
All LTC2442IG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2442IG#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 LTC2442IG#TRPBF part is unused and in its original packaging.
Return procedure for LTC2442IG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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