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Analog Devices Inc. LTC2391IUK-16#PBF
- Part No.:
- LTC2391IUK-16#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-WFQFN Exposed Pad
- Datasheet:
-
LTC2391IUK-16#PBF.pdf
- Description:
- IC ADC 16BIT SAR 48QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,311
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Product details
Overview
LTC2391IUK-16#PBF from Analog Devices (acquired 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 delivers no missing codes at 16 bits - ideal for high-dynamic-range data acquisition in industrial instrumentation and medical imaging.
For engineers reviewing the LTC2391IUK-16#PBF datasheet, LTC2391IUK-16#PBF pinout, LTC2391IUK-16#PBF application, or LTC2391IUK-16#PBF equivalent, key selection criteria include guaranteed operation from –40°C to +85°C, dual parallel/serial interface support, internal oscillator timing, nap/sleep power-down modes, and ±20ppm/°C reference tempco.
Technical Context
The LTC2391IUK-16#PBF implements a charge-redistribution SAR architecture with a precision internal 4.096V reference buffer and differential comparator. Its conversion cycle comprises acquisition (1485ns) followed by 2500ns successive approximation, achieving zero-cycle latency in both serial and parallel modes.
It features dual-domain power supplies: AVP/DVP (4.75–5.25V) for analog/digital core, and OVP (1.8–5V) for I/O interface. The device uses an internal oscillator for timing control, eliminating external clock dependency, and supports offset binary or two's complement output via OB/2C pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - guarantees full 65536-code dynamic range without missing codes. |
| Sampling Rate | 250ksps - enables real-time capture of signals up to 125kHz Nyquist bandwidth. |
| SNR | 94dB (typ) at fIN = 20kHz - ensures ≤0.002% RMS noise contribution relative to full-scale signal. |
| INL | ±2LSB (max) - limits integral nonlinearity error to ±0.003% of full scale, critical for precision measurement linearity. |
| Differential Input Range | ±4.096V - supports direct connection to high-voltage sensor outputs or transformer-coupled signals. |
| Reference Accuracy | ±0.5% initial, ±20ppm/°C max - maintains <±0.17% total drift over –40°C to +85°C operating range. |
| Power Dissipation | 95mW at 250ksps - enables thermally constrained designs without forced cooling. |
Pinout & Package
Package: 48-lead 7mm × 7mm plastic QFN (exposed pad grounded). All GND pins (1, 5, 7, 20, 35, 41, 44, 48, exposed pad 49) must connect to solid ground plane; AVP (2, 40, 45, 46, 47) and DVP (3, 19) require local 0.1μF + 10μF bypassing; OVP (18) requires 4.7μF ceramic close to pin.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (1,5,7,20,35,41,44,48,49) | Ground reference | Multiple low-inductance return paths required; exposed pad (49) must be soldered for thermal and electrical performance. |
| AVP (2,40,45,46,47) | Analog power supply | 4.75–5.25V supply for analog core; decoupling essential to preserve SNR and THD. |
| DVP (3,19) | Digital core power | 4.75–5.25V supply for SAR logic and internal timing; separate from OVP for noise isolation. |
| SER/PAR (4) | Interface mode select | High = serial (SDIN/SDOUT/SCLK); low = 16-bit parallel bus - determines active I/O configuration. |
| OB/2C (6) | Output format control | High = offset binary; low = two's complement - defines MSB polarity for bipolar signal representation. |
| BYTESWAP (8) | Byte ordering control | Low = D15–D0 on pins 28–9; high = upper/lower byte swap - enables compatibility with big-endian processors. |
| IN+, IN– (43,42) | Differential analog inputs | Accept ±4.096V differential swing; common-mode range centered at VREF/2 (2.048V); require matched drive impedance. |
| REFOUT, REFIN (37,38) | Internal reference I/O | Tie together for internal reference use; REFOUT → ground and REFIN → external ref when using LT1790-4.096. |
| CNVST (34) | Conversion start trigger | Falling edge initiates acquisition-to-hold transition and starts conversion - asynchronous to CS/RD. |
| BUSY (29) | Conversion status indicator | High during conversion; falling edge signals data-ready - usable as synchronous read strobe. |
| CS, RD (31,30) | Parallel/serial bus enable | Both low enables output drivers; RD pulse latches parallel data or clocks serial shift register. |
| D0–D15 (9–16,21,22,23,24,25–28) | Data I/O | 16-bit parallel outputs (D0 LSB to D15 MSB) or serial bitstream (MSB-first on SDOUT, pin 23). |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Zero-cycle latency enables deterministic real-time control loops without output buffering or FIFO management. |
| Internal oscillator | Eliminates need for external clock source or timing circuitry - simplifies PCB layout and reduces BOM count. |
| Nap/sleep power-down | Reduces current to 25μA (nap) or 19μA (sleep) - extends battery life in portable instrumentation and intermittent-sampling systems. |
| 1.8V–5V I/O voltage | Enables direct interfacing with modern low-voltage FPGAs, microcontrollers, and ASICs without level-shifting components. |
| Guaranteed 125°C operation | Validated performance up to +125°C ambient - suitable for under-hood automotive or high-temperature industrial environments. |
Applications
| Medical Imaging Signal Chain | Industrial Process Monitoring |
|---|---|
Use Scenario: Digitizing low-noise CT/MRI detector outputs requiring >90dB SNR and minimal harmonic distortion. IC Role / Device Role / Timing Role: Primary high-fidelity ADC capturing differential sensor voltages at 250ksps with precise timing alignment across channel arrays. Use Value: 94dB SNR and ±2LSB INL ensure accurate reconstruction of anatomical detail without quantization-induced artifacts. | Use Scenario: High-speed monitoring of pressure, temperature, and flow transducers in PLC-based control systems. IC Role / Device Role / Timing Role: Front-end ADC in distributed I/O modules, synchronizing multi-channel sampling with deterministic BUSY-driven readout. Use Value: No missing codes and guaranteed –40°C to +85°C operation ensure reliable data integrity across factory floor thermal cycles. |
| Digital Signal Processing Front-End | Automated Test Equipment (ATE) |
Use Scenario: Capturing wideband IF signals in software-defined radio or spectrum analyzers before FPGA-based FFT processing. IC Role / Device Role / Timing Role: High-linearity ADC feeding real-time DSP pipelines; internal oscillator provides jitter-free sampling clock. Use Value: 104dB SFDR and 93.5dB SINAD preserve signal fidelity for accurate spectral analysis and modulation error ratio (MER) calculation. | Use Scenario: Precision DC/AC parametric testing of ICs and passive components using calibrated stimulus-response methodology. IC Role / Device Role / Timing Role: Metrology-grade digitizer in ATE mainframe, referenced to external LT1790-4.096 for traceable accuracy. Use Value: ±0.5% internal reference accuracy and 0.17% max tempco over temperature allow pass/fail thresholds within ±1 LSB across environmental chambers. |
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 |
|---|---|---|---|
| ADS8860IDRCT | 16-bit, 1MSPS, SPI-only interface, 1.8V supply only, 92.5dB SNR (typ), no internal reference | Higher speed but lacks parallel interface and integrated reference - requires external reference and level-shifting for 5V systems | Select when maximum throughput >250ksps is required and system uses SPI-native controllers. |
| AD7606C-16BSTZ | 16-bit, 1MSPS, 8-channel simultaneous sampling, ±10V input range, internal reference, parallel/SPI | Multi-channel synchronized acquisition vs. single-channel high-SNR focus - larger package (64-LQFP), higher power (120mW) | Select when multi-sensor time-aligned capture is needed, not ultra-low noise per channel. |
Compared with ADS8860IDRCT and AD7606C-16BSTZ, the LTC2391IUK-16#PBF uniquely balances 250ksps throughput, 94dB SNR, integrated 4.096V reference, and dual parallel/serial interface in a compact 7mm × 7mm QFN - making it optimal for space-constrained, single-channel precision acquisition where timing determinism and reference stability are critical.
Availability
LTC2391IUK-16#PBF is available at Aetrix Electronics and suitable for industrial process control, medical imaging equipment, and automated test equipment requiring stable component supply across extended temperature ranges.
Supply support for LTC2391IUK-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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC2391IUK-16#PBF belongs to ADI's precision SAR ADC product line, designed specifically for applications demanding high resolution, low noise, and guaranteed monotonicity in harsh industrial and medical environments.
FAQ
What is the operating temperature range for the LTC2391IUK-16#PBF?
The LTC2391IUK-16#PBF is rated for operation from –40°C to +85°C, meeting industrial-grade environmental requirements. This grade is explicitly designated by the "I" suffix in the part number and confirmed in the Absolute Maximum Ratings table. The device maintains full specification compliance-including ±2LSB INL, 94dB SNR, and 250ksps throughput-across this entire range.
Does the LTC2391IUK-16#PBF require an external clock source?
No, the LTC2391IUK-16#PBF does not require an external clock source. It contains an internal oscillator that sets the conversion time (2500ns), enabling fully self-timed operation. External timing signals are unnecessary for basic functionality, though SCLK may be used in serial mode for data readout synchronization.
Can the LTC2391IUK-16#PBF operate with a 3.3V I/O supply?
Yes, the LTC2391IUK-16#PBF 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.) swing between 0V and 3.3V, and digital inputs (CNVST, CS, SER/PAR, etc.) recognize 0.8 × 3.3V = 2.64V as VIH minimum. This allows direct interfacing with 3.3V FPGAs and microcontrollers without level shifters.
How is the internal reference configured on the LTC2391IUK-16#PBF?
To use the internal reference on the LTC2391IUK-16#PBF, connect REFOUT (Pin 37) directly to REFIN (Pin 38), and leave REFSENSE (Pin 39) unconnected (floating). This configures the internal 4.096V reference buffer as the conversion reference. A ≥1μF capacitor should be placed from this node to ground to suppress reference noise and improve SNR performance.
What is the significance of the "#PBF" suffix in LTC2391IUK-16#PBF?
"#PBF" indicates lead-free (Pb-free) finish and RoHS-compliant packaging. It denotes that the LTC2391IUK-16#PBF uses environmentally compliant surface finishes on its 48-lead QFN package and meets JEDEC J-STD-020 moisture sensitivity level 3 (MSL3) requirements. This suffix is standard for Analog Devices' commercial and industrial temperature grade parts shipped in tape-and-reel format.
LTC2391IUK-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:
- -40°C ~ 85°C
- Supplier Device Package:
- 48-QFN (7x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2391IUK-16#PBF FAQ
1.How can I place an order for LTC2391IUK-16#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2391IUK-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 LTC2391IUK-16#PBF reliable?
The price and inventory of LTC2391IUK-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 LTC2391IUK-16#PBF is usually 5 days.
3.What payment methods are accepted for LTC2391IUK-16#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2391IUK-16#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2391IUK-16#PBF?
LTC2391IUK-16#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2391IUK-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 LTC2391IUK-16#PBF?
For technical support, including LTC2391IUK-16#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2391IUK-16#PBF requirements.
6.How does Aetrix verify that LTC2391IUK-16#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2391IUK-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 LTC2391IUK-16#PBF meets industry standards.
7.What is the process for return or replacement of LTC2391IUK-16#PBF?
All LTC2391IUK-16#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2391IUK-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 LTC2391IUK-16#PBF part is unused and in its original packaging.
Return procedure for LTC2391IUK-16#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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