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Analog Devices Inc. LTC2391IUK-16#TRPBF
- Part No.:
- LTC2391IUK-16#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-WFQFN Exposed Pad
- Datasheet:
-
LTC2391IUK-16#TRPBF.pdf
- Description:
- IC ADC 16BIT SAR 48QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,736
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Product details
Overview
LTC2391IUK-16#TRPBF from Analog Devices (formerly Linear Technology) is a 16-bit, 250ksps successive approximation register (SAR) analog-to-digital converter with ±4.096V fully differential input range, ±2LSB INL (max), 94dB SNR (typ), and integrated 4.096V reference. It operates from a single 5V supply, supports 1.8V–5V I/O, and targets high-dynamic-range data acquisition in industrial and medical systems.
For engineers reviewing the LTC2391IUK-16#TRPBF datasheet, LTC2391IUK-16#TRPBF pinout, LTC2391IUK-16#TRPBF application, or LTC2391IUK-16#TRPBF equivalent, key selection criteria include guaranteed 16-bit no-missing-codes operation, internal reference tempco ≤±20ppm/°C, dual parallel/serial interface support, 250ksps throughput with zero cycle latency, and –40°C to +85°C industrial temperature grade.
Technical Context
The LTC2391IUK-16#TRPBF employs a charge-redistribution SAR architecture with a precision internal 4.096V reference buffered for both internal and external reference modes. Its differential input stage features 50Ω on-resistance and 45pF sampling capacitance, enabling accurate acquisition within 1485ns.
Conversion timing is governed by an internal oscillator (no external clock required), delivering fixed 2500ns conversion time and eliminating pipeline delay. Interface flexibility includes selectable offset-binary/two's-complement output format, byte-swappable 16-bit parallel bus, and SPI-compatible serial mode with MSB-first SCLK-synchronized readout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - guarantees full 65,536-code dynamic range without missing codes across temperature. |
| Sampling Rate | 250ksps - enables real-time capture of signals up to 125kHz Nyquist bandwidth. |
| SNR | 94dB (typ) at fIN = 20kHz - delivers 15.6 effective bits (ENOB ≈ 15.3) for high-fidelity signal digitization. |
| INL | ±2LSB (max) - ensures monotonicity and <0.003% full-scale linearity error over –40°C to +85°C. |
| Reference Accuracy | ±0.5% initial, ±20ppm/°C max tempco - supports stable absolute measurement without external trimming. |
| Power Dissipation | 95mW at 250ksps - enables thermally constrained designs; nap mode reduces current to 25μA. |
| Differential Input Range | ±4.096V - matches standard 16-bit full-scale span, simplifying sensor interface and signal conditioning. |
Pinout & Package
48-lead 7mm × 7mm plastic QFN package with exposed thermal pad (Pin 49 = GND). All GND pins (1, 5, 7, 20, 35, 41, 44, 48) and exposed pad must be soldered to a solid ground plane for optimal thermal and noise performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (1,5,7,20,35,41,44,48,49) | Ground reference | Multiple low-inductance return paths for analog, digital, and power domains; exposed pad critical for thermal dissipation. |
| AVP (2,40,45,46,47) | Analog power supply | 4.75V–5.25V supply for analog core; requires local 0.1μF + 10μF ceramic bypassing to GND. |
| DVP (3,19) | Digital power supply | 4.75V–5.25V supply for SAR logic; separate bypassing prevents digital noise coupling into analog section. |
| OVP (18) | I/O interface supply | 1.8V–5V programmable voltage for level-shifting digital interface; bypass with 4.7μF ceramic to OGND. |
| IN+, IN– (43,42) | Differential analog inputs | Accept ±4.096V differential swing; input impedance modeled as 50Ω + 45pF during acquisition phase. |
| REFOUT, REFIN (37,38) | Reference output/input | Internal 4.096V reference enabled by shorting REFOUT–REFIN; external reference connected to REFIN with REFOUT grounded. |
| CNVST (34) | Conversion start trigger | Falling-edge initiated; independent of CS/RD, enabling precise timing control of sample-and-hold hold mode. |
| BUSY (29) | Conversion status indicator | Active-high pulse indicates conversion in progress; falling edge serves as clean data-ready strobe. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay, zero cycle latency | Enables deterministic real-time control loops and immediate post-conversion processing without FIFO buffering. |
| Parallel and serial interface modes | Configurable via SER/PAR pin; eliminates need for external interface translation logic in FPGA/microcontroller systems. |
| Internal oscillator for conversion timing | Removes dependency on external clock source, reducing BOM count and layout sensitivity to clock routing. |
| 1.8V–5V I/O voltage support | Direct interfacing with modern low-voltage FPGAs and microcontrollers without level translators. |
| Nap and sleep power-down modes | Reduces supply current to 25μA (nap) or 19μA (sleep), extending battery life in portable instrumentation. |
Applications
| Medical Imaging Signal Chain | Industrial Process Control ADC |
|---|---|
Use Scenario: Digitizing low-noise CT/MRI front-end sensor outputs with wide dynamic range and minimal harmonic distortion. IC Role / Device Role / Timing Role: Primary 16-bit SAR ADC capturing differential analog signals at 250ksps with synchronous BUSY-driven data capture. Use Value: 94dB SNR and ±2LSB INL ensure accurate reconstruction of subtle tissue contrast gradients without missing codes. |
Use Scenario: High-precision monitoring of pressure, temperature, and flow transducers in PLC analog input modules. IC Role / Device Role / Timing Role: Isolated analog front-end ADC with internal reference, supporting direct connection to 4–20mA loop receivers. Use Value: ±20ppm/°C reference tempco and –40°C to +85°C rating maintain calibration stability across factory floor environments. |
| High-Speed Data Acquisition System | Automated Test Equipment (ATE) |
Use Scenario: Modular DAQ card acquiring multi-channel sensor data for vibration analysis and spectral monitoring. IC Role / Device Role / Timing Role: High-throughput SAR ADC with parallel interface for low-latency transfer to FPGA-based DMA engines. Use Value: 250ksps rate with no cycle latency enables continuous streaming at full resolution without dead time between samples. |
Use Scenario: Precision DC parametric testing of ICs requiring sub-LSB accuracy and repeatable reference conditions. IC Role / Device Role / Timing Role: Calibration-grade ADC used with external LT1790-4.096 reference for metrology-grade voltage measurements. Use Value: Internal reference buffer supports external reference use while maintaining 93.5dB SINAD and 104dB SFDR performance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8860IRGET | 16-bit, 1MSPS, single-ended input only; no integrated reference; 1.8V supply only; 0.5LSB INL (typ). | Requires external reference and driver for differential signals; better suited for compact, high-speed single-ended systems. | Select when >250ksps speed is mandatory and differential input is not required. |
| AD7606C-16BSTZ | 16-bit, 1MSPS, 8-channel simultaneous sampling; ±10V/±5V input range; integrated reference; 0.5LSB INL (max). | Multi-channel synchronized acquisition; larger 64-lead LQFP package; higher power (140mW at 1MSPS). | Select when multi-channel phase-coherent sampling and wider input range are needed over single-channel performance. |
Compared with ADS8860IRGET and AD7606C-16BSTZ, the LTC2391IUK-16#TRPBF offers superior differential input capability and lower system-level component count due to its integrated 4.096V reference and dual-interface flexibility-critical for space-constrained, single-channel high-fidelity acquisition where ±4.096V full-scale alignment is standard.
Availability
LTC2391IUK-16#TRPBF is available at Aetrix Electronics and suitable for medical imaging signal chains, industrial process control modules, and high-speed data acquisition systems requiring stable component supply, extended temperature operation, and long-term production continuity.
Supply support for LTC2391IUK-16#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 LTC2391IUK-16#TRPBF belongs to ADI's precision SAR ADC product line, engineered for applications demanding high resolution, low noise, and guaranteed monotonicity without missing codes across extended temperature ranges.
FAQ
What is the operating temperature range of the LTC2391IUK-16#TRPBF?
The LTC2391IUK-16#TRPBF is rated for –40°C to +85°C ambient operation, meeting industrial temperature requirements. This grade is confirmed by the "I" suffix in the part number and applies across all electrical specifications unless otherwise noted in the datasheet's temperature column markers.
Does the LTC2391IUK-16#TRPBF require an external clock for conversion?
No, the LTC2391IUK-16#TRPBF uses an internal oscillator to set conversion timing, eliminating the need for an external clock source. The fixed 2500ns conversion time and 250ksps throughput are maintained regardless of external clock presence, simplifying system timing design.
Can the LTC2391IUK-16#TRPBF operate with a 3.3V I/O interface?
Yes, the LTC2391IUK-16#TRPBF supports 1.8V to 5V I/O voltage via the OVP pin (Pin 18). When OVP = 3.3V, all digital outputs (D0–D15, BUSY, RD, etc.) are referenced to that voltage, enabling direct interfacing with 3.3V FPGAs or microcontrollers without level shifters.
How does the internal reference of the LTC2391IUK-16#TRPBF connect?
To enable the internal 4.096V reference, tie REFOUT (Pin 37) directly to REFIN (Pin 38); leave REFSENSE (Pin 39) unconnected. This configuration activates the internal reference buffer, and the node should be bypassed with ≥1μF capacitor to GND for optimal noise performance.
What is the significance of the "#TRPBF" suffix in LTC2391IUK-16#TRPBF?
The "#TRPBF" suffix denotes tape-and-reel packaging with lead-free (Pb-free) finish. "TR" = tape and reel, "PBF" = Pb-free, and the part is supplied in standard industry packaging quantities compatible with automated SMT assembly lines.
LTC2391IUK-16#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 48-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 250k
- Number of Inputs:
- 1
- Input Type:
- Differential
- Data Interface:
- SPI, Parallel
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 48-QFN (7x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2391IUK-16#TRPBF FAQ
1.How can I place an order for LTC2391IUK-16#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2391IUK-16#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 LTC2391IUK-16#TRPBF reliable?
The price and inventory of LTC2391IUK-16#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2391IUK-16#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2391IUK-16#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2391IUK-16#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2391IUK-16#TRPBF?
LTC2391IUK-16#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2391IUK-16#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 LTC2391IUK-16#TRPBF?
For technical support, including LTC2391IUK-16#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2391IUK-16#TRPBF requirements.
6.How does Aetrix verify that LTC2391IUK-16#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2391IUK-16#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 LTC2391IUK-16#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2391IUK-16#TRPBF?
All LTC2391IUK-16#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2391IUK-16#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 LTC2391IUK-16#TRPBF part is unused and in its original packaging.
Return procedure for LTC2391IUK-16#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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