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Analog Devices Inc. LTC2391CLX-16#PBF
- Part No.:
- LTC2391CLX-16#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-LQFP
- Datasheet:
-
LTC2391CLX-16#PBF.pdf
- Description:
- IC ADC 16BIT SAR 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,180
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Product details
Overview
LTC2391CLX-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, enabling high-dynamic-range data acquisition in medical imaging and industrial process control systems.
For engineers reviewing the LTC2391CLX-16#PBF datasheet, LTC2391CLX-16#PBF pinout, LTC2391CLX-16#PBF application, or LTC2391CLX-16#PBF equivalent, key selection criteria include guaranteed 16-bit no-missing-codes operation, no pipeline delay, dual parallel/serial interface support, internal conversion clock, and 0°C to 70°C temperature grade in 48-lead LQFP package.
Technical Context
The LTC2391CLX-16#PBF implements a charge-redistribution SAR architecture with differential sampling switch network and precision comparator. Its internal 4.096V reference features ±20ppm/°C max tempco and 0.5% initial accuracy, and the ADC core achieves 93.5dB SINAD and 104dB SFDR at 20kHz input frequency.
It supports two digital interface modes: 16-bit parallel output (D0–D15) with CS/RD/BUSY handshaking, and serial output via SDOUT/SCLK with MSB-first timing. Conversion is initiated by CNVST falling edge, with 2500ns typical conversion time and no cycle latency in either mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 65,536 discrete output levels for high-precision measurement |
| Sampling Rate | 250ksps - enables real-time capture of signals up to 125kHz Nyquist bandwidth |
| INL (Max) | ±2LSB - ensures monotonicity and ≤0.003% full-scale linearity error |
| SNR (Typ) | 94dB at fIN = 20kHz - corresponds to ~15.6 effective bits (ENOB) under test conditions |
| Differential Input Range | ±4.096V - supports full-scale differential swing without external gain scaling |
| Power Dissipation | 95mW at 250ksps - enables thermally constrained high-speed DAQ designs |
| Reference Accuracy | ±0.5% initial, ±20ppm/°C max - eliminates need for external trimming in many applications |
| Interface Modes | Parallel (16-bit D[15:0]) and Serial (SDOUT/SCLK) - provides layout flexibility and pin-count optimization |
Pinout & Package
Package: 48-lead 7mm × 7mm plastic LQFP (LX package), operating temperature range 0°C to 70°C, exposed pad soldered to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 5, 7, 20, 35, 41, 44, 48, Exposed Pad 49) | Analog/Digital Ground Reference | All GND pins must connect to solid ground plane; exposed pad is mandatory ground connection for thermal and noise performance |
| AVP (Pins 2, 40, 45, 46, 47) | Analog Power Supply | 4.75V–5.25V supply for analog core; requires local 0.1μF + 10μF ceramic bypassing |
| DVP (Pins 3, 19) | Digital Core Power Supply | 4.75V–5.25V supply for SAR logic and control; separate from AVP for noise isolation |
| IN+, IN– (Pins 42, 43) | Differential Analog Inputs | Accept ±4.096V differential signal; input impedance modeled as 50Ω series + 40pF during acquisition |
| REFOUT, REFIN, REFSENSE (Pins 37, 38, 39) | Reference Interface | Internal 4.096V reference enabled by tying REFOUT to REFIN; REFSENSE left open for internal use |
| CNVST (Pin 34) | Conversion Start Trigger | Falling-edge sensitive; initiates sample-and-hold hold phase and conversion sequence independently of CS |
| BUSY (Pin 29) | Conversion Status Indicator | Active-high pulse indicates conversion in progress; falling edge signals data-ready for read access |
| CS, RD (Pins 31, 30) | Parallel Interface Control | Low-low combination enables 16-bit parallel output bus; RD strobes data valid timing |
| SER/PAR, OB/2C, BYTESWAP (Pins 4, 6, 8) | Interface Configuration | Selects serial vs parallel mode, offset binary vs two's complement output, and byte ordering for 16-bit data |
| D0–D15 (Pins 9–16, 21, 22, 23, 24, 25–28) | Digital Output Data Bus | 16-bit parallel outputs (D0 LSB to D15 MSB); in serial mode, D9/SDIN and D10/SDOUT become bidirectional data lines |
Key Features
| Feature | Design Value |
|---|---|
| No missing codes at 16-bit resolution | Guarantees monotonic transfer function across full temperature range, eliminating code ambiguities in closed-loop control |
| No pipeline delay or cycle latency | Delivers first valid conversion result after exactly one CNVST trigger, enabling deterministic real-time sampling |
| Internal oscillator for conversion timing | Eliminates external clock source and associated jitter; simplifies system timing design and reduces BOM count |
| Nap and sleep power-down modes | Reduces IDD to 25μA (nap) or 19μA (sleep), extending battery life in portable instrumentation without sacrificing wake-up speed |
| 1.8V to 5V I/O voltage compatibility | Allows direct interfacing with low-voltage FPGAs and microcontrollers without level-shifting circuitry |
| Guaranteed operation to 125°C junction temperature | Supports reliable deployment in harsh industrial environments with adequate PCB thermal management |
Applications
| Medical Imaging | High-Speed Data Acquisition |
|---|---|
Use Scenario: Digitizing ultrasound echo signals or MRI gradient waveforms requiring wide dynamic range and low distortion. IC Role / Device Role / Timing Role: Primary 16-bit SAR ADC capturing baseband analog signals at 250ksps with precise timing alignment via CNVST and BUSY. Use Value: 94dB SNR and 104dB SFDR preserve weak signal fidelity amid strong interference, critical for diagnostic image clarity. | Use Scenario: Real-time monitoring of vibration, pressure, or temperature in automated test equipment (ATE) racks. IC Role / Device Role / Timing Role: High-throughput front-end ADC feeding FPGA-based FFT engines with deterministic parallel data delivery. Use Value: No pipeline delay ensures sub-microsecond latency between analog event and digital result, enabling responsive fault detection. |
| Digital Signal Processing | Industrial Process Control |
Use Scenario: Sampling sensor outputs in motor drive feedback loops or power quality analyzers requiring synchronized multi-channel capture. IC Role / Device Role / Timing Role: Precision ADC providing clean 16-bit samples to DSP for real-time filtering, harmonic analysis, and control algorithm execution. Use Value: ±2LSB INL and 93.5dB SINAD ensure accurate representation of small signal variations within large common-mode swings. | Use Scenario: Monitoring analog field transmitters (4–20mA, ±10V) in PLC I/O modules deployed in factory automation systems. IC Role / Device Role / Timing Role: Isolated, high-accuracy ADC converting conditioned sensor signals with internal reference stability over temperature. Use Value: ±20ppm/°C reference tempco and 0°C to 70°C grade enable stable calibration across ambient shifts without recalibration. |
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, 1.8V supply, no internal reference | Higher speed but lacks parallel interface and integrated reference; requires external 4.096V reference and level-shifting for 5V systems | Preferred when system demands >250ksps and uses SPI-native processors; not drop-in due to supply and interface mismatch |
| AD7606BSTZ | 16-bit, 200ksps, 8-channel simultaneous sampling, ±10V input range, internal reference | Multi-channel architecture with oversampling capability; larger 64-lead LQFP package and higher 145mW power | Selected for multi-sensor synchronous acquisition where channel count outweighs single-channel speed; pinout and timing incompatible |
Compared with ADS8860IDRCT and AD7606BSTZ, the LTC2391CLX-16#PBF uniquely balances 250ksps throughput, dual parallel/serial interface, integrated 4.096V reference, and 48-lead LQFP footprint-making it optimal for space-constrained, single-channel, high-fidelity DAQ designs requiring minimal external components.
Availability
LTC2391CLX-16#PBF is available at Aetrix Electronics and suitable for medical imaging systems, industrial process control modules, and high-speed data acquisition equipment requiring stable component supply across extended production lifecycles.
Supply support for LTC2391CLX-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 technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC2391-16 product line was designed by Linear Technology (acquired by ADI in 2017) to deliver precision, low-latency, single-supply SAR ADC performance for demanding instrumentation and control applications where dynamic range and timing determinism are critical.
FAQ
What is the maximum sampling rate of the LTC2391CLX-16#PBF?
The LTC2391CLX-16#PBF achieves a guaranteed 250ksps (kilo-samples per second) throughput rate across its full 0°C to 70°C operating temperature range. This rate is supported in both parallel and serial interface modes with no cycle latency, meaning each CNVST trigger produces one complete 16-bit conversion result within 2500ns, enabling deterministic real-time sampling for time-critical applications.
Does the LTC2391CLX-16#PBF require an external reference voltage?
No, the LTC2391CLX-16#PBF includes a precision internal 4.096V reference with ±0.5% initial accuracy and ±20ppm/°C max temperature coefficient. To use it, simply tie REFOUT to REFIN and leave REFSENSE unconnected. An external reference may be used for higher accuracy, but it is not required for standard operation of the LTC2391CLX-16#PBF.
What package type and lead finish does the LTC2391CLX-16#PBF use?
The LTC2391CLX-16#PBF is supplied in a 48-lead 7mm × 7mm plastic LQFP (LX package) with lead-free (Pb-free) finish, compliant with RoHS Directive 2011/65/EU. The exposed pad (Pin 49) must be soldered to the PCB ground plane for thermal dissipation and optimal electrical performance.
How does the LTC2391CLX-16#PBF handle power management during idle periods?
The LTC2391CLX-16#PBF provides two low-power states: Nap mode (25μA typical supply current) and Sleep mode (19μA typical). These are activated via the PD (Power-Down) pin. In both modes, the internal reference remains active, allowing fast wake-up (<1μs) without reference stabilization delay-critical for burst-mode acquisition in the LTC2391CLX-16#PBF.
Can the LTC2391CLX-16#PBF interface directly with a 3.3V FPGA or microcontroller?
Yes, the LTC2391CLX-16#PBF supports 1.8V to 5V I/O voltage levels via the OVP (Output Voltage Power) supply pin. When OVP is set to 3.3V, all digital outputs (D0–D15, BUSY, RD, etc.) operate at 3.3V logic levels, and inputs (CS, RD, CNVST, etc.) accept 3.3V-compatible thresholds-enabling direct, level-matched connection to 3.3V FPGAs without external translators.
LTC2391CLX-16#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 48-LQFP
- Packaging:
- Tray
- 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-LQFP (7x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2391CLX-16#PBF FAQ
1.How can I place an order for LTC2391CLX-16#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2391CLX-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 LTC2391CLX-16#PBF reliable?
The price and inventory of LTC2391CLX-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 LTC2391CLX-16#PBF is usually 5 days.
3.What payment methods are accepted for LTC2391CLX-16#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2391CLX-16#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2391CLX-16#PBF?
LTC2391CLX-16#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2391CLX-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 LTC2391CLX-16#PBF?
For technical support, including LTC2391CLX-16#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2391CLX-16#PBF requirements.
6.How does Aetrix verify that LTC2391CLX-16#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2391CLX-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 LTC2391CLX-16#PBF meets industry standards.
7.What is the process for return or replacement of LTC2391CLX-16#PBF?
All LTC2391CLX-16#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2391CLX-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 LTC2391CLX-16#PBF part is unused and in its original packaging.
Return procedure for LTC2391CLX-16#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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