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Analog Devices Inc. LTC2448CUHF#TRPBF
- Part No.:
- LTC2448CUHF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC2448CUHF#TRPBF.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,095
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Product details
Overview
LTC2448CUHF#TRPBF from Analog Devices (formerly Linear Technology) is a 24-bit, 16-channel (8-differential) no-latency delta-sigma ADC with selectable speed/resolution, internal oscillator, and differential input/reference support. It delivers 200nVRMS noise at 13.8Hz with simultaneous 50Hz/60Hz rejection, 0.0005% INL, and <5µV offset over –40°C to 85°C - enabling high-precision weight scales and auto-ranging DVMs.
For engineers reviewing the LTC2448CUHF#TRPBF datasheet, LTC2448CUHF#TRPBF pinout, LTC2448CUHF#TRPBF application, or LTC2448CUHF#TRPBF equivalent, key selection criteria include guaranteed modulator stability under all input/reference conditions, no settling latency after channel changes, autosleep operation down to 20µA at 6.9Hz, and full-speed multiplexing up to 4kHz with external oscillator.
Technical Context
The LTC2448CUHF#TRPBF implements a proprietary 3rd-order delta-sigma modulator with decimating FIR filter and on-the-fly autocalibration of offset and full-scale every conversion cycle. Its no-latency architecture ensures the first result after any channel/speed/resolution change is fully accurate - eliminating filter settling delays and memory effects between conversions.
It supports both internal oscillator (no external components) and external fO up to 12MHz, enabling configurable output rates from 6.9Hz to 8kHz. The 4-wire SPI-compatible interface (SDI/SDO/SCK/CS) operates in either internal-SCK (SCK output) or external-SCK (SCK input) mode, selected via the EXT pin - with BUSY indicating conversion status and CS controlling wake/sleep states.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit with no missing codes - guarantees monotonicity and unambiguous digital representation across full input range. |
| RMS Noise | 200nV at 13.8Hz output rate with simultaneous 50Hz/60Hz rejection - enables direct thermocouple and low-level sensor digitization without external notch filtering. |
| INL | ±5ppm of VREF (0.0005%) - ensures sub-1-LSB linearity error for 6½-digit DVM-grade accuracy. |
| Offset Error | <5µV (4.5V ≤ VCC ≤ 5.5V, –40°C to 85°C) - eliminates need for system-level offset trimming in precision weigh scales. |
| Input Channels | 16 single-ended or 8 differential inputs with GND-to-VCC common-mode range - supports flexible sensor interfacing without level-shifting circuitry. |
| Supply Current | 8mA typical in conversion mode; 20µA in autosleep at 6.9Hz - enables battery-powered portable instrumentation with extended runtime. |
| Reference Range | 0.1V to VCC differential reference (REF+–REF–), with REF+/REF– absolute range GND to VCC - allows ratiometric or independent reference configurations. |
Pinout & Package
Package: 38-lead (5mm × 7mm) plastic QFN with exposed pad (Pin 39 = GND). Requires soldering exposed pad to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1,4,5,6,31,32,33) | Ground reference and power return | Seven dedicated ground pins minimize ground bounce and improve PSRR; all must connect to low-impedance ground plane. |
| BUSY (Pin 2) | Conversion status indicator | Active-HIGH during conversion; goes LOW when 32-bit result is ready - enables interrupt-driven data capture without polling. |
| EXT (Pin 3) | SCK mode select | LOW = external SCK input; HIGH = internal SCK output - configures serial interface timing without register writes. |
| COM (Pin 7) | Common negative input | Shared IN– for all single-ended channels; supports bipolar input range (–0.5×VREF to +0.5×VREF) when paired with CH0–CH15. |
| CH0–CH15 (Pins 8–23) | Analog input channels | Programmable as single-ended or differential pairs; each accepts GND–0.3V to VCC+0.3V - accommodates wide sensor output ranges. |
| VCC (Pin 28) | Positive supply | 4.5V to 5.5V operation; requires local 10µF tantalum + 0.1µF ceramic bypass - critical for noise-sensitive delta-sigma performance. |
| REF+/REF– (Pins 29/30) | Differential reference inputs | Accept 0.1V to VCC differential voltage; REF+/REF– absolute range spans GND to VCC - enables flexible reference sourcing. |
| SDI/SDO/SCK/CS (Pins 34,37,38,36) | 4-wire serial interface | Compatible with standard SPI timing; CS controls wake/sleep; SDI configures next conversion; BUSY synchronizes readout. |
| FO (Pin 35) | Frequency control | Tie to GND or VCC to enable internal oscillator; connect external clock (0.1–12MHz) for precise timing control and higher output rates. |
Key Features
| Feature | Design Value |
|---|---|
| No-latency delta-sigma architecture | First conversion after channel/speed change is fully accurate - eliminates settling delay and enables true real-time multiplexed acquisition. |
| Per-conversion autocalibration | Continuous offset and full-scale correction - maintains stability over temperature, supply variation, and time without user intervention. |
| Simultaneous 50Hz/60Hz rejection | Hardware-implemented notch at 6.9Hz output rate - removes mains interference without software filtering or increased latency. |
| Autosleep mode | 20µA quiescent current at 6.9Hz output rate - extends battery life in portable test equipment and field instruments. |
| True differential input & reference | GND-to-VCC common-mode range on all analog pins - simplifies interfacing with industrial sensors, bridges, and isolated signal sources. |
Applications
| Weight Scales | Auto-Ranging 6-Digit DVMs |
|---|---|
Use Scenario: High-resolution load cell measurement in commercial and industrial weighing systems requiring OIML R76 compliance. IC Role / Device Role / Timing Role: Primary ADC digitizing mV-level bridge outputs with 200nVRMS noise floor and simultaneous 50/60Hz rejection. Use Value: Eliminates external instrumentation amplifiers and notch filters while delivering 1:106 dynamic range at 13.8Hz - reducing BOM cost and board space. |
Use Scenario: Benchtop digital multimeters with automatic range switching and sub-ppm accuracy verification. IC Role / Device Role / Timing Role: Core 24-bit converter handling DCV, ACV, resistance, and continuity measurements with no-latency channel switching. Use Value: Enables seamless autoranging without measurement gaps or calibration drift - achieving 6½-digit resolution with <5µV offset stability. |
| Direct Temperature Measurement | High-Speed Data Acquisition |
Use Scenario: Cold-junction compensation and thermocouple linearization in industrial process controllers. IC Role / Device Role / Timing Role: Precision ADC capturing thermocouple EMF and RTD reference junction voltage simultaneously. Use Value: Differential input with GND-to-VCC common-mode range accepts thermocouple voltages directly - avoiding level-shifters and improving EMI immunity. |
Use Scenario: Multi-sensor monitoring in predictive maintenance systems sampling vibration, pressure, and current waveforms. IC Role / Device Role / Timing Role: 16-channel multiplexer feeding high-speed delta-sigma core with up to 4kHz per-channel scan rate using external oscillator. Use Value: Supports 500Hz full 8-differential channel scan without inter-channel settling errors - enabling synchronized multi-parameter analysis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision multichannel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1258IRTCR | 24-bit, 16-channel, but uses sinc3 filter with inherent latency; no simultaneous 50/60Hz rejection; requires external crystal. | Lower noise (1µVRMS) only at slower rates (<1kSPS); lacks no-latency channel switching for real-time multiplexing. | Prefer LTC2448CUHF#TRPBF when zero-latency channel changes and hardware 50/60Hz rejection are required. |
| AD7768-1ACPZ | 24-bit, 1-channel sigma-delta with 128kSPS max; includes digital filter bypass mode but no integrated MUX. | Higher speed but single-input; requires external multiplexer and driver for multichannel use - increasing complexity and noise. | Prefer LTC2448CUHF#TRPBF for integrated 16-channel solution with guaranteed modulator stability and autosleep. |
Compared with ADS1258IRTCR and AD7768-1ACPZ, the LTC2448CUHF#TRPBF uniquely combines no-latency multiplexing, per-conversion autocalibration, and simultaneous 50/60Hz rejection in a single QFN package - reducing system-level design effort for precision industrial instrumentation.
Availability
LTC2448CUHF#TRPBF is available at Aetrix Electronics and suitable for weight scales, auto-ranging DVMs, direct temperature measurement, and high-speed data acquisition requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC2448CUHF#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 technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC2448CUHF#TRPBF belongs to ADI's legacy Linear Technology precision delta-sigma ADC family, designed specifically for high-resolution, low-drift, multichannel data acquisition in demanding industrial and test equipment applications.
FAQ
What is the maximum output data rate achievable with the LTC2448CUHF#TRPBF?
The LTC2448CUHF#TRPBF achieves up to 8kHz output rate when using an external oscillator (fO = 12MHz) in 2X speed mode. With its internal oscillator, the maximum is 7kHz. At 8kHz, the device introduces one-cycle latency but maintains full DC accuracy - making it suitable for high-throughput sensor monitoring where minimal delay is acceptable.
Does the LTC2448CUHF#TRPBF require external components for basic operation?
No, the LTC2448CUHF#TRPBF operates with no external components when using its internal oscillator. Only standard power supply decoupling (10µF tantalum + 0.1µF ceramic on VCC) is required. External components like crystals or buffers are optional - used only to enable higher speeds, improved timing accuracy, or MUXOUT/ADCIN signal conditioning in LTC2445/LTC2449 variants.
How does the LTC2448CUHF#TRPBF handle input overrange and underrange conditions?
The LTC2448CUHF#TRPBF generates unique 32-bit output codes for overrange (+FS) and underrange (–FS) conditions. Bits 29 and 28 together indicate status: both HIGH = overrange (>+0.5×VREF); both LOW = underrange (<–0.5×VREF). This allows firmware to detect saturation without additional analog comparators or threshold monitoring circuits.
Can the LTC2448CUHF#TRPBF interface directly with thermocouples?
Yes, the LTC2448CUHF#TRPBF supports direct thermocouple interfacing via its differential inputs and GND-to-VCC common-mode range. When paired with a cold-junction sensor on COM or CHx, it digitizes µV-level thermocouple outputs with 200nVRMS noise at 13.8Hz - enabling high-accuracy temperature measurement without external amplification or filtering.
What is the significance of the "UHF" package designation in LTC2448CUHF#TRPBF?
The "UHF" in LTC2448CUHF#TRPBF denotes the 38-lead, 5mm × 7mm plastic QFN package with exposed thermal pad (Pin 39 = GND). This package provides low thermal resistance (θJA = 34°C/W) and excellent high-frequency performance - critical for maintaining SNR in precision delta-sigma converters operating near their noise floor.
LTC2448CUHF#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 24
- Sampling Rate (Per Second):
- 8k
- Number of Inputs:
- 8, 16
- 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:
- 38-QFN (5x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2448CUHF#TRPBF FAQ
1.How can I place an order for LTC2448CUHF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2448CUHF#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 LTC2448CUHF#TRPBF reliable?
The price and inventory of LTC2448CUHF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2448CUHF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2448CUHF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2448CUHF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2448CUHF#TRPBF?
LTC2448CUHF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2448CUHF#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 LTC2448CUHF#TRPBF?
For technical support, including LTC2448CUHF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2448CUHF#TRPBF requirements.
6.How does Aetrix verify that LTC2448CUHF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2448CUHF#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 LTC2448CUHF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2448CUHF#TRPBF?
All LTC2448CUHF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2448CUHF#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 LTC2448CUHF#TRPBF part is unused and in its original packaging.
Return procedure for LTC2448CUHF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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