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Analog Devices Inc. LTC2391CUK-16#TRPBF
- Part No.:
- LTC2391CUK-16#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-WFQFN Exposed Pad
- Datasheet:
-
LTC2391CUK-16#TRPBF.pdf
- Description:
- IC ADC 16BIT SAR 48QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,536
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Product details
Overview
LTC2391CUK-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 and supports 1.8V–5V I/O, making it suitable for high-dynamic-range data acquisition in medical imaging and industrial process control.
For engineers reviewing the LTC2391CUK-16#TRPBF datasheet, LTC2391CUK-16#TRPBF pinout, LTC2391CUK-16#TRPBF application, or LTC2391CUK-16#TRPBF equivalent, key selection criteria include guaranteed 16-bit no-missing-codes operation, zero-cycle-latency parallel/serial interface, internal oscillator timing, 125°C-rated QFN package, and low 95mW power at full throughput.
Technical Context
The LTC2391CUK-16#TRPBF implements a charge-redistribution SAR architecture with a precision internal 4.096V reference (±20ppm/°C max tempco) and fully differential input stage optimized for ±VREF signal swing. Its conversion core uses a 16-bit CDAC and differential comparator to achieve ±2LSB INL and 94dB SNR at fIN = 20kHz.
It supports dual interface modes: parallel (16-bit D[15:0] bus with CS/RD/BUSY control) and serial (SDIN/SDOUT/SCLK with MSB-first timing), both with no pipeline delay. The internal oscillator eliminates external clock dependency, and dedicated CNVST, PD, RESET, and BYTESWAP pins enable precise timing control and data format flexibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - guarantees full 65,536-level quantization 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 for high-fidelity signal reconstruction. |
| INL | ±2LSB (max) - ensures monotonicity and accurate end-point linearity in precision measurement systems. |
| Input Range | ±4.096V differential - matches standard 16-bit full-scale reference, simplifying sensor interface design. |
| Power Dissipation | 95mW at 250ksps - enables high-speed operation in thermally constrained embedded systems. |
| Reference | Integrated 4.096V (±0.5% initial accuracy, ±20ppm/°C max) - eliminates external reference component count and layout complexity. |
Pinout & Package
48-lead 7mm × 7mm plastic QFN package (UK grade, 0°C to 70°C operating range) with exposed thermal pad (Pin 49, GND). All GND pins (1, 5, 7, 20, 35, 41, 44, 48, 49) must connect to a solid ground plane for optimal noise performance and thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+, IN– (Pins 43, 42) | Differential analog inputs | Accept ±4.096V differential signal; require matched drive impedance for CMRR >70dB. |
| CNVST (Pin 34) | Conversion start trigger | Falling edge initiates sample-and-hold hold mode and starts conversion; asynchronous to CS/RD. |
| BUSY (Pin 29) | Conversion status indicator | High during conversion; falling edge signals valid data ready for read access. |
| CS, RD (Pins 31, 30) | Parallel interface enable | Both low enable 16-bit D[15:0] output bus; support byte-swapped or native MSB-first ordering. |
| SER/PAR (Pin 4) | Interface mode select | Low = parallel mode (D0–D15 active); high = serial mode (SDIN/SDOUT/SCLK active). |
| REFOUT, REFIN (Pins 37, 38) | Internal reference I/O | Tied together for internal reference use; REFIN accepts external 2.5V–4.096V reference if higher accuracy required. |
Key Features
| Feature | Design Value |
|---|---|
| No cycle latency | Immediate data availability after BUSY falls - eliminates pipeline delay for deterministic real-time control loops. |
| Flexible digital interface | Selectable parallel (16-bit bus) or serial (3-wire SPI-compatible) output - reduces PCB routing complexity or saves MCU GPIOs. |
| Configurable data format | OB/2C pin selects offset binary or two's complement; BYTESWAP pin swaps upper/lower bytes - simplifies firmware alignment handling. |
| Low-power operation | 95mW active, 125μW nap mode, 25μA sleep mode - extends battery life in portable instrumentation without sacrificing speed. |
| Robust analog input | ±0.05V absolute input range beyond supplies, 45pF sample-mode capacitance, 7psRMS aperture jitter - enables direct connection to precision op-amp drivers. |
Applications
| Medical Imaging | High-Speed Data Acquisition |
|---|---|
|
Use Scenario: Digitizing CT/MRI detector channel outputs requiring wide dynamic range and low distortion. IC Role / Device Role / Timing Role: Primary SAR ADC capturing 20kHz–100kHz analog waveforms with 94dB SNR and <2LSB INL. Use Value: Enables 16-bit fidelity across full ±4.096V range without external gain/attenuation, reducing system noise floor by 3dB vs. 14-bit alternatives. |
Use Scenario: Real-time waveform capture in automated test equipment (ATE) for semiconductor validation. IC Role / Device Role / Timing Role: High-throughput sampling engine synchronized to external trigger via CNVST, with BUSY-driven data readout. Use Value: 250ksps rate with zero latency allows 4μs per sample window - sufficient for 100k-point FFTs at 25MHz analysis bandwidth. |
| Digital Signal Processing | Industrial Process Control |
|
Use Scenario: Front-end digitization for FPGA-based adaptive filtering in software-defined radio receivers. IC Role / Device Role / Timing Role: Low-jitter (7psRMS) ADC feeding parallel bus directly into FPGA fabric for real-time FIR processing. Use Value: Internal 4.096V reference eliminates drift-induced DC offset in multi-channel coherent sampling systems. |
Use Scenario: Monitoring high-voltage motor phase currents using isolated amplifier outputs in factory automation PLCs. IC Role / Device Role / Timing Role: Precision ADC interfacing with isolated Σ-Δ modulators, accepting ±4.096V differential inputs over extended temperature. Use Value: Guaranteed operation to 70°C ambient (C-grade) and 125°C junction enables placement near heat-generating power stages. |
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 |
|---|---|---|---|
| AD7606C-16 | 8-channel simultaneous-sampling, ±10V input range, 200ksps/channel, internal reference ±10ppm/°C | Multi-channel synchronized acquisition; requires external anti-aliasing filters per channel | Choose AD7606C-16 when simultaneous sampling across ≥2 channels is required; LTC2391CUK-16#TRPBF offers superior SNR per channel and lower power. |
| ADS8860 | Single-ended input, 1MSPS, 91dB SNR, 1.8V supply, no internal reference | Ultra-low-power portable systems; requires external reference and level-shifting for bipolar signals | Choose ADS8860 for battery-powered handheld instruments needing >1MSPS; LTC2391CUK-16#TRPBF provides better noise performance and integrated reference for fixed installations. |
Compared with AD7606C-16 and ADS8860, the LTC2391CUK-16#TRPBF delivers highest SNR (94dB) and lowest power (95mW) among 16-bit 250ksps SAR ADCs with integrated reference, while its ±4.096V differential input simplifies high-precision sensor interfacing without external signal conditioning.
Availability
LTC2391CUK-16#TRPBF is available at Aetrix Electronics and suitable for medical imaging systems, industrial process controllers, automated test equipment, and high-fidelity digital signal processing platforms requiring stable component supply and long-term production continuity.
Supply support for LTC2391CUK-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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC2391 series belongs to Linear Technology's precision SAR ADC product line, designed specifically for applications demanding high resolution, low noise, and guaranteed no-missing-codes performance in harsh electrical environments.
FAQ
What is the operating temperature range for the LTC2391CUK-16#TRPBF?
The LTC2391CUK-16#TRPBF is rated for 0°C to 70°C ambient operation (C-grade). Its junction temperature can reach 125°C, enabling reliable use in thermally demanding industrial enclosures. This differs from the I-grade (–40°C to 85°C) and H-grade (–40°C to 125°C) variants, which share identical electrical specifications but wider thermal qualification.
Does the LTC2391CUK-16#TRPBF require an external clock source?
No, the LTC2391CUK-16#TRPBF includes an internal oscillator that sets the 250ksps conversion timing, eliminating the need for an external clock. In serial mode, only the SCLK signal (driven by the host) is required for data readout; in parallel mode, no external clock is needed beyond CNVST triggering and BUSY-synchronized RD pulses.
How does the internal reference of the LTC2391CUK-16#TRPBF compare to external references?
The LTC2391CUK-16#TRPBF internal reference provides 4.096V ±0.5% initial accuracy and ±20ppm/°C max tempco. For applications requiring tighter tolerance, an external reference like the LT1790-4.096 (0.05% initial, ±10ppm/°C) can be connected to REFIN, with REFOUT tied to ground and REFSENSE connected to the external reference's ground.
Can the LTC2391CUK-16#TRPBF interface directly with a 3.3V microcontroller?
Yes - the LTC2391CUK-16#TRPBF supports 1.8V to 5V I/O voltage (OVP pin), allowing direct connection to 3.3V logic without level shifters. When OVP = 3.3V, VIH = 2.64V min and VOL = 0.2V max ensure robust noise margins. Digital supply DVP remains at 5V, isolating analog and digital power domains.
What is the significance of the "#TRPBF" suffix in LTC2391CUK-16#TRPBF?
The "#TRPBF" suffix indicates a lead-free, tape-and-reel packaged version: "TR" = tape-and-reel, "PBF" = Pb-free (RoHS-compliant). The "UK" denotes the 48-lead 7mm × 7mm QFN package. This variant is optimized for automated SMT assembly and meets environmental compliance requirements for commercial-grade applications.
LTC2391CUK-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:
- 0°C ~ 70°C
- Supplier Device Package:
- 48-QFN (7x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2391CUK-16#TRPBF FAQ
1.How can I place an order for LTC2391CUK-16#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2391CUK-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 LTC2391CUK-16#TRPBF reliable?
The price and inventory of LTC2391CUK-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 LTC2391CUK-16#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2391CUK-16#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2391CUK-16#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2391CUK-16#TRPBF?
LTC2391CUK-16#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2391CUK-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 LTC2391CUK-16#TRPBF?
For technical support, including LTC2391CUK-16#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2391CUK-16#TRPBF requirements.
6.How does Aetrix verify that LTC2391CUK-16#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2391CUK-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 LTC2391CUK-16#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2391CUK-16#TRPBF?
All LTC2391CUK-16#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2391CUK-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 LTC2391CUK-16#TRPBF part is unused and in its original packaging.
Return procedure for LTC2391CUK-16#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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