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Analog Devices Inc. LTC2391CUK-16#PBF
- Part No.:
- LTC2391CUK-16#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-WFQFN Exposed Pad
- Datasheet:
-
LTC2391CUK-16#PBF.pdf
- Description:
- IC ADC 16BIT SAR 48QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,704
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Product details
Overview
LTC2391CUK-16#PBF 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#PBF datasheet, LTC2391CUK-16#PBF pinout, LTC2391CUK-16#PBF application, or LTC2391CUK-16#PBF equivalent, key selection criteria include guaranteed no missing codes at 16 bits, absence of pipeline delay, dual parallel/serial interface flexibility, internal conversion clock, and operation up to 70°C ambient temperature.
Technical Context
The LTC2391CUK-16#PBF implements a charge-redistribution SAR architecture with a precision internal 4.096V reference (±20ppm/°C max tempco) and differential input sampling circuitry. Its acquisition time is 1485ns and conversion time is 2500ns, enabling full 250ksps throughput with zero cycle latency in both serial and parallel modes.
It features dual power domains: AVP/DVP (4.75–5.25V) for analog/digital core and OVP (1.8–5V) for I/O interface, plus dedicated OGND and GND planes. The device includes nap/sleep power-down modes, delivering 95mW at full rate and <25μA in sleep mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - guarantees full-scale quantization into 65,536 discrete levels with no missing codes. |
| Sampling Rate | 250ksps - enables real-time capture of signals up to 125kHz Nyquist bandwidth without undersampling. |
| SNR | 94dB (typ) at fIN = 20kHz - delivers 15.3 effective bits (ENOB ≈ 15.3) for high-fidelity signal reconstruction. |
| INL | ±2LSB (max) - ensures monotonicity and linearity critical for closed-loop control and calibration-sensitive systems. |
| Differential Input Range | ±4.096V - supports full-scale bipolar signals without external gain scaling, simplifying front-end design. |
| Reference | Integrated 4.096V (±0.5% initial accuracy, ±20ppm/°C max) - eliminates need for external reference in cost- and space-constrained designs. |
| Power Dissipation | 95mW at 250ksps - enables thermal management in dense PCB layouts without forced cooling. |
Pinout & Package
Package: 48-lead 7mm × 7mm plastic QFN (UK package) with exposed thermal pad (Pin 49 = GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1,5,7,20,35,41,44,48,49) | Ground reference | All GND pins must connect to solid ground plane; exposed pad (Pin 49) is mandatory for thermal dissipation and noise immunity. |
| AVP (Pins 2,40,45,46,47) | Analog power supply | 4.75–5.25V analog rail; requires local 0.1μF + 10μF ceramic bypassing to minimize switching noise coupling into analog path. |
| DVP (Pins 3,19) | Digital core power | 4.75–5.25V digital supply for SAR logic and internal timing; separate from OVP to isolate I/O noise. |
| OVP (Pin 18) | I/O interface power | 1.8–5V programmable I/O voltage - sets logic thresholds for parallel/serial bus and enables mixed-voltage system interfacing. |
| IN+, IN– (Pins 43,42) | Differential analog inputs | Accepts ±4.096V differential swing; input impedance ~85kΩ (REFIN), common-mode range centered at VCM = 2.048V. |
| REFOUT / REFIN (Pins 37,38) | Reference output/input | Internal 4.096V ref connects REFOUT→REFIN; external ref ties REFOUT→GND and REFIN→ref source with REFSENSE grounded. |
| SER/PAR (Pin 4) | Interface mode select | Logic low = parallel 16-bit bus (D0–D15); logic high = serial mode using SDIN/SDOUT/SCLK with MSB-first timing. |
| CNVST (Pin 34) | Conversion start | Falling-edge triggered; initiates sample-to-hold transition and conversion - asynchronous to CS/RD, enabling precise timing control. |
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 or timing uncertainty. |
| Parallel and serial interface support | Reduces BOM count and layout complexity - parallel mode suits FPGA/microcontroller direct bus attachment; serial mode saves pins in space-constrained designs. |
| Internal conversion clock | Eliminates need for external master clock generation and synchronization circuitry, simplifying system-level timing architecture. |
| Nap and sleep power-down modes | Reduces active current to 19mA (nap) or 25μA (sleep), extending battery life in portable instrumentation and enabling duty-cycled sensing. |
| Guaranteed operation to 70°C | Validated performance across commercial temperature range - suitable for non-automotive industrial enclosures without derating. |
Applications
| Medical Imaging Data Acquisition | High-Speed Industrial Process Control |
|---|---|
|
Use Scenario: Digitizing CT/MRI sensor outputs requiring >90dB SNR and 16-bit fidelity over wide dynamic range. IC Role / Device Role / Timing Role: Primary SAR ADC capturing differential analog signals from detector arrays with precise timing via CNVST edge triggering. Use Value: 94dB SNR and ±2LSB INL ensure accurate reconstruction of low-contrast anatomical features without harmonic distortion artifacts. |
Use Scenario: Closed-loop feedback in PLC-based motor drives where analog sensor data must be sampled synchronously at ≥200ksps. IC Role / Device Role / Timing Role: Real-time ADC in servo control loop with zero-latency parallel readout and deterministic BUSY-driven data-ready signaling. Use Value: No missing codes and 250ksps throughput enable sub-microsecond position correction cycles without data gaps or timing jitter. |
| Automated Test Equipment (ATE) | High-Fidelity Digital Signal Processing Front-End |
|
Use Scenario: Precision waveform capture in benchtop ATE systems validating amplifier linearity and THD performance. IC Role / Device Role / Timing Role: Reference-grade ADC with internal 4.096V reference and 104dB SFDR used as golden measurement channel. Use Value: 93.5dB SINAD and –103dB THD allow validation of DUTs down to 16-bit resolution without reference-induced error masking. |
Use Scenario: Anti-aliasing front-end for FPGA-based spectral analysis in communications test gear operating up to 100kHz input. IC Role / Device Role / Timing Role: High-SNR digitizer feeding FFT engines; uses internal oscillator to eliminate clock skew between sampling and processing clocks. Use Value: 50MHz –3dB input bandwidth and 7psRMS aperture jitter preserve signal integrity for accurate frequency-domain representation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8860IDRCT | 16-bit, 1MSPS, SPI-only interface, 91.5dB SNR, external reference required | Higher speed but lacks parallel interface and internal reference - demands external ref design and FPGA/CPU SPI handling | Select when maximum throughput >250ksps is required and system already supports external precision references. |
| MAX11902ETX+ | 16-bit, 250ksps, ±2.048V input range, 92.5dB SNR, internal ref (±10ppm/°C), 32-QFN | Narrower input range limits dynamic headroom; superior tempco but smaller package complicates thermal management | Prefer for compact designs needing tighter reference stability, provided ±2.048V range matches signal conditioning architecture. |
Compared with ADS8860IDRCT and MAX11902ETX+, the LTC2391CUK-16#PBF uniquely combines internal 4.096V reference, ±4.096V differential input, parallel/serial dual interface, and zero-latency operation - making it optimal for systems prioritizing design simplicity, wide input range, and deterministic timing over raw speed or ultra-low tempco.
Availability
LTC2391CUK-16#PBF is available at Aetrix Electronics and suitable for medical imaging systems, industrial process controllers, and automated test equipment requiring stable component supply, long-term manufacturability, and guaranteed commercial-temperature performance.
Supply support for LTC2391CUK-16#PBF 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 ICs, serving industrial, automotive, communications, and healthcare markets.
The LTC2391 series belongs to Analog Devices' precision SAR ADC product line, designed specifically for high-speed, high-dynamic-range data acquisition where linearity, noise floor, and timing determinism are critical - not general-purpose conversion.
FAQ
What is the operating temperature range for the LTC2391CUK-16#PBF?
The LTC2391CUK-16#PBF is rated for 0°C to 70°C ambient operation (Commercial grade). This is confirmed by the "C" suffix in the part number and the ordering information table specifying "0°C to 70°C" for the UK package variant. It is not qualified for extended industrial or automotive temperature ranges.
Does the LTC2391CUK-16#PBF require an external clock source?
No, the LTC2391CUK-16#PBF does not require an external clock source. It contains an internal oscillator that sets the conversion time, eliminating external timing components. The datasheet explicitly states "An internal oscillator sets the conversion time, easing external timing considerations" and lists tCONV = 2500ns as a guaranteed parameter.
Can the LTC2391CUK-16#PBF operate with a 3.3V I/O interface?
Yes, the LTC2391CUK-16#PBF supports 1.8V to 5V I/O voltages via the OVP pin (Pin 18). When OVP is supplied with 3.3V, all digital inputs (SER/PAR, OB/2C, etc.) recognize 0.8×3.3V = 2.64V as VIH minimum, and outputs drive to VOH ≥ 3.1V, ensuring full compatibility with 3.3V logic families without level shifters.
How is the reference configured for the LTC2391CUK-16#PBF?
For internal reference use, connect REFOUT (Pin 37) directly to REFIN (Pin 38) and leave REFSENSE (Pin 39) unconnected. This configures the on-chip 4.096V reference as the conversion reference. The datasheet specifies nominal REFOUT = 4.096V with ±0.5% initial accuracy and ±20ppm/°C max tempco under this configuration.
What package type does the LTC2391CUK-16#PBF use?
The LTC2391CUK-16#PBF uses a 48-lead 7mm × 7mm plastic QFN package (designated "UK" in Linear/Analog Devices nomenclature). It features an exposed thermal pad (Pin 49) that must be soldered to the PCB ground plane for proper thermal performance and electrical noise reduction.
LTC2391CUK-16#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 48-WFQFN Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC2391CUK-16#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2391CUK-16#PBF 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#PBF reliable?
The price and inventory of LTC2391CUK-16#PBF 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#PBF is usually 5 days.
3.What payment methods are accepted for LTC2391CUK-16#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2391CUK-16#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2391CUK-16#PBF?
LTC2391CUK-16#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2391CUK-16#PBF 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#PBF?
For technical support, including LTC2391CUK-16#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2391CUK-16#PBF requirements.
6.How does Aetrix verify that LTC2391CUK-16#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2391CUK-16#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LTC2391CUK-16#PBF?
All LTC2391CUK-16#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2391CUK-16#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LTC2391CUK-16#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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