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Analog Devices Inc. LTC2448IUHF#TRPBF
- Part No.:
- LTC2448IUHF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC2448IUHF#TRPBF.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,841
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Product details
Overview
LTC2448IUHF#TRPBF from Analog Devices (formerly Linear Technology) is a 24-bit, 16-channel (8-differential) no-latency delta-sigma ADC with selectable speed/resolution, 2 µVRMS noise at 1.76 kHz output rate, 0.0005% INL, and differential input/reference support from GND to VCC. It enables high-precision, high-speed data acquisition in weight scales and auto-ranging DVMs.
For engineers reviewing the LTC2448IUHF#TRPBF datasheet, LTC2448IUHF#TRPBF pinout, LTC2448IUHF#TRPBF application, or LTC2448IUHF#TRPBF equivalent, key selection criteria include guaranteed modulator stability under all input/reference conditions, simultaneous 50 Hz/60 Hz rejection at 6.9 Hz, autosleep mode for 20 µA operation, and internal oscillator eliminating external timing components.
Technical Context
The LTC2448IUHF#TRPBF implements a proprietary third-order delta-sigma modulator with decimating FIR filtering and per-conversion auto-calibration of offset and full-scale. Its no-latency architecture ensures the first conversion after channel/speed/resolution change is fully accurate-no settling delay or DC shift.
It supports 10 discrete speed/resolution combinations (6.9 Hz to 3.5 kHz native, up to 8 kHz with external oscillator), 2× speed mode with one-cycle latency, and flexible 4-wire SPI interface with internal or external SCK selection via the EXT pin. Input common-mode range is independent of reference voltage and spans GND to VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit with no missing codes-guaranteed monotonicity and full code coverage across full input range. |
| RMS Noise | 2 µV at 1.76 kHz output rate; 200 nV at 13.8 Hz with simultaneous 50/60 Hz rejection-enables ultra-low-noise precision measurement. |
| INL | ±0.0005% of full scale (±12 ppm)-ensures high linearity without calibration in 6½-digit DVM applications. |
| Offset Error | <5 µV over –40°C to +85°C (4.5 V ≤ VCC ≤ 5.5 V)-minimizes zero-point drift in temperature-sensitive systems. |
| Input Channels | 16 single-ended or 8 differential inputs (CH0–CH15), with COM pin supporting pseudo-differential configurations. |
| Reference Range | Differential reference (REF+ – REF–) from 0.1 V to VCC; common-mode range GND to VCC-supports rail-to-rail reference flexibility. |
| Supply Current | 8–11 mA in conversion mode; 20 µA in autosleep at 6.9 Hz-enables low-power continuous monitoring. |
Pinout & Package
38-lead (5 mm × 7 mm) plastic QFN package (UHF) with exposed thermal pad (Pin 39 = GND). All seven ground pins (1, 4, 5, 6, 31, 32, 33) must be connected to PCB ground plane for optimal noise immunity and decoupling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (1, 4, 5, 6, 31, 32, 33) | Ground reference and power return | Multiple dedicated ground paths reduce ground bounce and improve PSRR in multi-channel scanning. |
| BUSY (2) | Conversion status indicator | Active-HIGH during conversion; transitions LOW when 32-bit result is ready-enables interrupt-driven data capture. |
| EXT (3) | SCK mode select | LOW = external SCK input; HIGH = internal SCK output on Pin 38-configures serial interface without registers. |
| COM (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 CHx. |
| CH0–CH15 (8–23) | Analog multiplexer inputs | Programmable as single-ended or differential pairs; full GND–VCC common-mode tolerance enables direct sensor interfacing. |
| VCC (28) | Positive supply | 4.5 V to 5.5 V operation; requires local 10 µF tantalum + 0.1 µF ceramic bypass-critical for RMS noise performance. |
| REF+/REF– (29/30) | Differential reference inputs | Accept 0.1 V–VCC differential reference; common-mode range matches VCC, enabling ratiometric sensor designs. |
| SDI/SDO/SCK/CS (34/37/38/36) | 4-wire SPI interface | CS-active-low wake-up; SDI configures next conversion; SDO outputs 32-bit frame with EOC/SIG/MSB/status bits. |
| FO (35) | Internal/external oscillator control | Tied to GND or VCC selects internal oscillator; connects to external clock (0.1–12 MHz) for precise timing control. |
Key Features
| Feature | Design Value |
|---|---|
| No-latency delta-sigma architecture | First conversion after channel/speed change is fully accurate-eliminates dead time and settling errors in multiplexed systems. |
| Per-conversion auto-calibration | Continuous offset and full-scale correction removes drift due to temperature, supply variation, and aging-no user intervention required. |
| Simultaneous 50 Hz/60 Hz rejection | Guaranteed at 6.9 Hz output rate without notch filters-enables clean AC-line-immune measurements in industrial environments. |
| Autosleep mode | Reduces current to 20 µA at 6.9 Hz output rate-extends battery life in portable instrumentation and remote sensors. |
| True differential input & reference | Independent GND-to-VCC common-mode ranges for inputs and reference-supports grounded, floating, and ratiometric sensor topologies. |
Applications
| Weight Scales | Auto-Ranging 6-Digit DVMs |
|---|---|
|
Use Scenario: High-resolution load cell signal digitization in commercial and industrial weighing systems requiring OIML R76 compliance. IC Role / Device Role / Timing Role: Primary 24-bit ADC capturing microvolt-level bridge outputs with simultaneous line-frequency rejection and no latency between channel scans. Use Value: 200 nVRMS noise at 13.8 Hz and 0.0005% INL enable true 1:106 dynamic range-meeting Class III/IIII accuracy requirements without external amplification. |
Use Scenario: Core ADC in benchtop and handheld digital voltmeters performing automatic range switching and autoranging. IC Role / Device Role / Timing Role: High-speed, high-linearity converter delivering calibrated 24-bit samples at up to 3.5 kHz for real-time averaging and statistical analysis. Use Value: Selectable speed/resolution (6.9 Hz to 3.5 kHz) allows adaptive oversampling-maximizing resolution at low speeds and throughput at high speeds within same hardware. |
| Direct Temperature Measurement | High-Speed Data Acquisition |
|
Use Scenario: Direct digitization of thermocouple, RTD, or thermistor outputs in process control and environmental monitoring. IC Role / Device Role / Timing Role: Precision delta-sigma ADC with differential inputs, programmable gain path (via COM), and integrated cold-junction compensation support. Use Value: Differential input range (–0.5·VREF to +0.5·VREF) and <5 µV offset error enable sub-0.1°C resolution with Type K thermocouples using 2.5 V reference. |
Use Scenario: Multi-channel sensor fusion in test equipment, motor control feedback, and vibration analysis systems. IC Role / Device Role / Timing Role: 16-channel scan-capable ADC delivering synchronized samples at up to 8 kHz (with external oscillator) and 500 Hz full-channel scan rate. Use Value: 8 kHz max output rate and no-latency mode allow real-time closed-loop control with <125 µs worst-case latency per channel-critical for servo tuning. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-resolution delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1258IRHBT | 24-bit, 16-channel, but uses switched-capacitor SAR architecture; no inherent 50/60 Hz rejection; higher typical noise (3.5 µVRMS at 1 kSPS). | Requires external digital notch filtering for AC-line rejection; less suited for direct thermocouple measurement without preamplification. | Prefer LTC2448IUHF#TRPBF when simultaneous line-frequency rejection, no-latency scanning, or lower system noise floor is required. |
| LTC2449IUHF#TRPBF | Pin-compatible variant with MUXOUT/ADCIN pins and √2 lower RMS noise (≈140 nV at 13.8 Hz); identical speed/resolution table and pinout. | Enables external buffering/gain before ADC input-ideal for high-impedance sensors or isolated front-ends where drive capability matters. | Select LTC2448IUHF#TRPBF for cost-optimized, buffer-free designs; choose LTC2449IUHF#TRPBF only if external signal conditioning is needed. |
Compared with ADS1258IRHBT, the LTC2448IUHF#TRPBF delivers superior noise performance and built-in line-frequency rejection without firmware overhead; compared with LTC2449IUHF#TRPBF, it omits MUXOUT/ADCIN pins-reducing BOM cost and layout complexity where external buffering is unnecessary.
Availability
LTC2448IUHF#TRPBF is available at Aetrix Electronics and suitable for weight scales, auto-ranging DVMs, and direct temperature measurement systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC2448IUHF#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) acquired Linear Technology in 2017 and maintains its precision analog portfolio, including high-performance delta-sigma ADCs, with focus on metrology-grade accuracy and robust industrial reliability.
The LTC2448IUHF#TRPBF belongs to the LTC244x family of no-latency delta-sigma ADCs designed specifically for high-speed, high-accuracy data acquisition in instrumentation, test equipment, and industrial control where latency, linearity, and noise are critical.
FAQ
What is the maximum output data rate of the LTC2448IUHF#TRPBF?
The LTC2448IUHF#TRPBF achieves up to 8 kHz output rate when using an external oscillator (fEOSC = 10 MHz) in 2× speed mode. With its internal oscillator, the maximum native rate is 3.5 kHz in 1× mode or 7 kHz in 2× mode. Each output sample is fully settled and accurate-no latency or filter delay.
Does the LTC2448IUHF#TRPBF require external calibration components?
No. The LTC2448IUHF#TRPBF performs full offset and full-scale auto-calibration every conversion cycle, eliminating the need for external trim components or periodic recalibration. This ensures long-term stability of <5 µV offset error and ±0.0005% INL across –40°C to +85°C without user intervention.
How does the LTC2448IUHF#TRPBF handle 50 Hz and 60 Hz interference?
The LTC2448IUHF#TRPBF provides guaranteed simultaneous 50 Hz and 60 Hz rejection at its 6.9 Hz output rate through inherent delta-sigma modulation and decimation-no external notch filters or software algorithms required. This is achieved by integer division of the internal modulator clock, ensuring deterministic rejection without configuration.
Can the LTC2448IUHF#TRPBF operate with a 3.3 V supply?
No. The LTC2448IUHF#TRPBF requires a 4.5 V to 5.5 V supply (VCC). Its absolute maximum rating is 6 V, and operation below 4.5 V is not specified or guaranteed. For 3.3 V systems, consider level-shifting digital interfaces or selecting a different ADC family rated for 3.3 V operation.
What is the function of the COM pin on the LTC2448IUHF#TRPBF?
The COM pin on the LTC2448IUHF#TRPBF serves as the common negative input (IN–) for all single-ended channel configurations. When used with CH0–CH15, it defines the reference point for pseudo-differential measurements and supports input common-mode voltages from GND – 0.3 V to VCC + 0.3 V-enabling direct connection to grounded sensors or biased transducers.
LTC2448IUHF#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:
- -40°C ~ 85°C
- Supplier Device Package:
- 38-QFN (5x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2448IUHF#TRPBF FAQ
1.How can I place an order for LTC2448IUHF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2448IUHF#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 LTC2448IUHF#TRPBF reliable?
The price and inventory of LTC2448IUHF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2448IUHF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2448IUHF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2448IUHF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2448IUHF#TRPBF?
LTC2448IUHF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2448IUHF#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 LTC2448IUHF#TRPBF?
For technical support, including LTC2448IUHF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2448IUHF#TRPBF requirements.
6.How does Aetrix verify that LTC2448IUHF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2448IUHF#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 LTC2448IUHF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2448IUHF#TRPBF?
All LTC2448IUHF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2448IUHF#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 LTC2448IUHF#TRPBF part is unused and in its original packaging.
Return procedure for LTC2448IUHF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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