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Analog Devices Inc. LTC2368IDE-18#PBF
- Part No.:
- LTC2368IDE-18#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC2368IDE-18#PBF.pdf
- Description:
- IC ADC 18BIT SAR 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,750
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Product details
Overview
LTC2368IDE-18#PBF from Analog Devices (formerly Linear Technology) is an 18-bit, 1 Msps pseudo-differential unipolar successive approximation register (SAR) ADC operating from a single 2.5V supply. It delivers 97 dB SNR (typ), ±2.5 LSB INL (max), and guaranteed no missing codes at full 18-bit resolution with VREF adjustable from 2.5 V to 5.1 V. Its low 13.5 mW power consumption and internal conversion clock make it suitable for high-speed, precision data acquisition in compact instrumentation.
For engineers reviewing the LTC2368IDE-18#PBF datasheet, LTC2368IDE-18#PBF pinout, LTC2368IDE-18#PBF application, or LTC2368IDE-18#PBF equivalent, key selection criteria include its 1 Msps throughput with zero cycle latency, SPI-compatible daisy-chain interface supporting 1.8 V–5 V I/O, pseudo-differential input architecture with ±100 mV IN– range, and operation across –40°C to +85°C in the 4 mm × 3 mm DFN package.
Technical Context
The LTC2368IDE-18#PBF employs a charge redistribution capacitor DAC (CDAC) with 40 Ω switch on-resistance and 45 pF sampling capacitance per analog input, enabling precise pseudo-differential acquisition where IN+ accepts 0 V to VREF while IN– operates within ±100 mV of GND. Its internal oscillator eliminates external timing dependencies, and conversion completes in 460 ns with no pipeline delay.
It features dual-supply architecture: 2.5 V (VDD) powers the analog core and reference path, while OVDD (1.71 V–5.25 V) independently supplies digital I/O-enabling seamless interfacing with 1.8 V, 2.5 V, 3.3 V, or 5 V host logic. Auto power-down between conversions reduces idle current to 0.9 µA, scaling dynamically with sample rate.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit-guarantees 262,144 discrete output levels with no missing codes over full temperature range. |
| Sampling Rate | 1 Msps-supports real-time capture of signals up to 500 kHz Nyquist bandwidth without undersampling. |
| SNR | 97 dB (typ, fIN = 2 kHz, VREF = 5 V)-enables >16.1 ENOB for high-fidelity signal reconstruction. |
| INL | ±2.5 LSB (max, –40°C to +85°C)-ensures monotonicity and < ±0.0038% full-scale linearity error. |
| Power @ 1 Msps | 13.5 mW (VDD = 2.5 V, OVDD = 2.5 V)-achieves 13.5 µW/Msps efficiency ideal for battery-powered systems. |
| Reference Range | 2.5 V to 5.1 V-allows flexible dynamic range tuning; LSB = 19 µV at 5 V reference. |
| Aperture Jitter | 4 ps (rms)-limits sampling uncertainty to < 0.02 LSB at 2 kHz input, preserving SNR integrity. |
Pinout & Package
Package: 16-lead (4 mm × 3 mm) plastic DFN with exposed pad (Pin 17), rated for –40°C to +85°C operation. Exposed pad must be soldered to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CHAIN (1) | Mode control input | Selects normal mode (RDL/SDI as bus enable) or daisy-chain mode (RDL/SDI as serial data input); referenced to OVDD. |
| VDD (2) | Analog core supply | 2.375 V–2.625 V supply powering ADC core, reference buffer, and CDAC; requires 10 µF ceramic bypass to GND. |
| GND (3,6,10,16) | Analog/digital ground | Four dedicated ground pins minimize noise coupling; Pin 17 (exposed pad) is additional GND for DFN package. |
| IN+ (4) | Pseudo-differential analog input | Accepts 0 V to VREF voltage; sampled via 45 pF capacitance and 40 Ω switch during acquisition phase. |
| IN– (5) | Common-mode sense input | Range: –0.1 V to +0.1 V vs GND; rejects common-mode noise but must be tied to clean ground or remote sense point. |
| REF (7,8) | Reference voltage inputs | Dual pins accept 2.5 V–5.1 V external reference; require 47 µF X5R ceramic decoupling close to pins. |
| CNV (9) | Convert trigger input | Rising edge initiates conversion and powers up ADC; supports burst sampling with 20 ns minimum high time. |
| BUSY (11) | Conversion status indicator | Active-high open-drain output signaling conversion progress; transitions low 460 ns after CNV rising edge. |
| RDL/SDI (12) | Configurable serial interface pin | In normal mode: enables/disables SDO tri-state; in chain mode: receives serial data from upstream ADC. |
| SCK (13) | Serial clock input | Accepts up to 100 MHz clock (10 ns period); controls MSB-first data shift-out timing on SDO. |
| SDO (14) | Serial data output | Outputs 18-bit straight-binary result; valid 9.5 ns after SCK rising edge (CL = 20 pF). |
| OVDD (15) | I/O interface supply | 1.71 V–5.25 V supply setting logic thresholds for all digital pins; bypass with 0.1 µF capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| No cycle latency | Delivers first valid conversion result immediately after CNV rising edge-no pipeline delay enables deterministic real-time control loops. |
| Auto power-down | Reduces total supply current to 0.9 µA between conversions, cutting idle power by >99.9% versus active mode. |
| SPI-compatible daisy-chain mode | Enables synchronous readout of multiple LTC2368IDE-18#PBF devices using single SCK/SDO lines-reduces FPGA/GPIO resource usage. |
| Guaranteed operation to 85°C | All specifications-including INL, SNR, and THD-fully characterized and guaranteed across –40°C to +85°C ambient range. |
| Flexible reference interface | Dual REF pins support low-impedance connection to high-precision references (e.g., LTC6655-5) with minimal voltage droop during conversion bursts. |
Applications
| Medical Imaging Signal Chain | High-Speed Industrial DAQ |
|---|---|
Use Scenario: Digitizing low-noise analog outputs from ultrasound beamformer channels or MRI gradient amplifiers requiring wide dynamic range and minimal harmonic distortion. IC Role / Device Role / Timing Role: Primary SAR ADC capturing 18-bit samples at 1 Msps with 97 dB SNR and –120 dB THD to preserve diagnostic image fidelity. Use Value: Enables detection of sub-millivolt tissue echoes without averaging, improving spatial resolution and reducing scan time. | Use Scenario: Real-time monitoring of motor phase currents, vibration spectra, or pressure transducer outputs in predictive maintenance systems. IC Role / Device Role / Timing Role: High-accuracy front-end ADC synchronizing with PWM controllers via CNV-triggered sampling to capture transient fault signatures. Use Value: Captures 500 kHz bandwidth signals with < ±0.004% linearity error-supporting ISO 50001 energy audit compliance. |
| Portable Precision Instrumentation | Automated Test Equipment (ATE) |
Use Scenario: Handheld multimeters or portable oscilloscopes needing battery life extension without sacrificing DC accuracy or AC performance. IC Role / Device Role / Timing Role: Low-power 18-bit ADC operating from 2.5 V supply with auto power-down, delivering 13.5 µW/Msps efficiency. Use Value: Extends battery runtime >4× versus comparable 16-bit parts while maintaining 1 ppm/°C full-scale drift stability. | Use Scenario: Channelized ATE systems requiring synchronized multi-channel sampling with deterministic latency for parametric testing. IC Role / Device Role / Timing Role: Daisy-chained ADC array providing simultaneous 18-bit sampling across 8+ channels using shared SCK/SDO lines. Use Value: Reduces test head cabling complexity and FPGA pin count while guaranteeing <1 ns inter-channel skew. |
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, 1 Msps, 2.5 V supply, SPI interface; SNR = 92.5 dB (typ), INL = ±1.5 LSB (max); no daisy-chain mode. | Lower resolution and SNR limit use in >16-bit precision applications; lacks CHAIN pin for multi-device synchronization. | Select when 16-bit resolution suffices and system cost sensitivity outweighs need for 18-bit fidelity or daisy-chain scalability. |
| AD7960BCPZ-RL7 | 18-bit, 5 Msps, 5 V supply, LVDS/CMOS parallel interface; SNR = 95.5 dB (typ), INL = ±2.0 LSB (max); requires external clock and reference buffer. | Higher speed but higher power (46 mW), larger 48-lead LFCSP package, and complex interface increase BOM and layout effort. | Select for >1 Msps throughput needs where board space and power budget allow; not drop-in compatible due to pinout and supply differences. |
Compared with ADS8860IDRCT and AD7960BCPZ-RL7, the LTC2368IDE-18#PBF uniquely balances 18-bit resolution, 1 Msps throughput, ultra-low 13.5 mW power, and integrated daisy-chain capability in a compact DFN-making it optimal for space-constrained, multi-channel, battery-aware precision DAQ systems.
Availability
LTC2368IDE-18#PBF is available at Aetrix Electronics and suitable for medical imaging signal chains, high-speed industrial data acquisition, and portable precision instrumentation requiring stable component supply across extended temperature ranges.
Supply support for LTC2368IDE-18#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 LTC2368 family was designed specifically for high-speed, low-power, precision data acquisition in demanding environments-from medical diagnostics to industrial automation-emphasizing noise performance, temperature stability, and ease of system integration.
FAQ
What is the maximum operating temperature range for the LTC2368IDE-18#PBF?
The LTC2368IDE-18#PBF is specified and guaranteed for operation from –40°C to +85°C. All key parameters-including INL (±2.5 LSB max), SNR (97 dB typ), and THD (–120 dB typ)-are fully characterized across this industrial temperature range, with no derating required. The DFN package's exposed pad enhances thermal dissipation to maintain reliability at elevated ambient temperatures.
Does the LTC2368IDE-18#PBF require an external reference, and what are the recommended reference specifications?
Yes, the LTC2368IDE-18#PBF requires an external reference applied to its dual REF pins (Pins 7 and 8). Recommended references include the LTC6655-5 (0.025% initial accuracy, 2 ppm/°C drift), which provides optimal SNR and THD performance. The REF input accepts 2.5 V to 5.1 V, draws up to 0.7 mA at 1 Msps, and must be decoupled with a 47 µF X5R ceramic capacitor placed adjacent to the REF pins.
How does the daisy-chain mode function on the LTC2368IDE-18#PBF, and what pins are involved?
Daisy-chain mode is enabled by driving the CHAIN pin (Pin 1) high. In this mode, RDL/SDI (Pin 12) becomes a serial data input receiving data from the previous device in the chain, while SDO (Pin 14) outputs the concatenated result of all upstream conversions. SCK (Pin 13) clocks data out synchronously, allowing up to 8+ LTC2368IDE-18#PBF devices to share one SPI bus without additional chip-select lines.
What is the significance of the pseudo-differential input architecture in the LTC2368IDE-18#PBF?
The pseudo-differential input architecture uses IN+ (0 V to VREF) and IN– (±100 mV around GND) to reject common-mode noise while maintaining unipolar signal handling. Unlike true differential ADCs, it does not require inverted signal paths-simplifying front-end design. This architecture achieves 80 dB CMRR at 500 kHz and enables direct connection to single-ended sensors or op-amp buffers like the LT6202 without level-shifting circuitry.
Can the LTC2368IDE-18#PBF operate with different OVDD and VDD supply voltages, and what are the implications?
Yes-the LTC2368IDE-18#PBF supports independent OVDD (1.71 V–5.25 V) and VDD (2.375 V–2.625 V) supplies. This allows interfacing with 1.8 V microcontrollers while maintaining optimal 2.5 V analog core performance. Digital pin thresholds scale with OVDD (VIH = 0.8 × OVDD), ensuring robust logic compatibility. No power sequencing is required, but VDD must stabilize before OVDD to prevent latch-up per Absolute Maximum Ratings.
LTC2368IDE-18#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 18
- Sampling Rate (Per Second):
- 1M
- Number of Inputs:
- 1
- Input Type:
- Pseudo-Differential
- Data Interface:
- SPI
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.375V ~ 2.625V
- Voltage - Supply, Digital:
- 2.375V ~ 2.625V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-DFN (4x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2368IDE-18#PBF FAQ
1.How can I place an order for LTC2368IDE-18#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2368IDE-18#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 LTC2368IDE-18#PBF reliable?
The price and inventory of LTC2368IDE-18#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2368IDE-18#PBF is usually 5 days.
3.What payment methods are accepted for LTC2368IDE-18#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2368IDE-18#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2368IDE-18#PBF?
LTC2368IDE-18#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2368IDE-18#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 LTC2368IDE-18#PBF?
For technical support, including LTC2368IDE-18#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2368IDE-18#PBF requirements.
6.How does Aetrix verify that LTC2368IDE-18#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2368IDE-18#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 LTC2368IDE-18#PBF meets industry standards.
7.What is the process for return or replacement of LTC2368IDE-18#PBF?
All LTC2368IDE-18#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2368IDE-18#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 LTC2368IDE-18#PBF part is unused and in its original packaging.
Return procedure for LTC2368IDE-18#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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