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Analog Devices Inc. LTC2368CDE-16#PBF
- Part No.:
- LTC2368CDE-16#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC2368CDE-16#PBF.pdf
- Description:
- IC ADC 16BIT SAR 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,245
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Product details
Overview
LTC2368CDE-16#PBF from Analog Devices (formerly Linear Technology) is a 16-bit, 1 Msps pseudo-differential unipolar successive approximation register (SAR) ADC operating from a single 2.5V supply. It delivers ±0.75 LSB INL max, guaranteed no missing codes at 16 bits, and 94.7 dB SNR (typ) at 2 kHz input with 5 V reference - enabling high-fidelity data acquisition in space-constrained, low-power systems such as portable instrumentation and industrial process controllers.
For engineers reviewing the LTC2368CDE-16#PBF datasheet, LTC2368CDE-16#PBF pinout, LTC2368CDE-16#PBF application, or LTC2368CDE-16#PBF equivalent, key selection criteria include its 16-lead 4 mm × 3 mm DFN package, 2.5 V to 5.1 V programmable reference range, SPI-compatible daisy-chain interface, internal conversion clock, and guaranteed operation from 0°C to 70°C.
Technical Context
The LTC2368CDE-16#PBF employs a charge redistribution capacitor DAC (CDAC) architecture with pseudo-differential sampling, where IN+ accepts 0 V to VREF and IN– operates as a ground-sense node (±100 mV range). Conversion is initiated by a rising edge on CNV, with no pipeline delay and fixed 460 ns conversion time.
Its SPI-compatible serial interface supports 1.8 V to 5 V logic levels via OVDD, includes daisy-chain mode (enabled by CHAIN pin), and outputs straight-binary 16-bit data MSB-first on SDO synchronized to SCK. Internal oscillator eliminates external clock dependency, and auto power-down reduces current to 0.9 µA between conversions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 65,536 discrete output levels for high dynamic range digitization. |
| Sampling Rate | 1 Msps - enables real-time capture of signals up to ~34 MHz input bandwidth (–3 dB). |
| INL (Max) | ±0.75 LSB - ensures monotonicity and linearity critical for precision measurement applications. |
| SNR (Typ) | 94.7 dB at fIN = 2 kHz, VREF = 5 V - corresponds to ~15.8 effective bits (ENOB) under test conditions. |
| Power (1 Msps) | 13.5 mW total - split across VDD (5.4 mA) and OVDD (0.9 mA), enabling battery-operated designs. |
| Reference Range | 2.5 V to 5.1 V - allows flexible full-scale scaling while maintaining 76 µV LSB size at 5 V. |
| Operating Temp | 0°C to 70°C - commercial-grade thermal specification validated for stable performance in ambient environments. |
Pinout & Package
Package: 16-lead (4 mm × 3 mm) plastic DFN with exposed pad (Pin 17), RoHS-compliant, lead-free finish. Exposed pad must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CHAIN (1) | Mode control input | Selects normal mode (RDL/SDI = bus enable) or daisy-chain mode (RDL/SDI = SDI); logic referenced to OVDD. |
| VDD (2) | Analog supply | 2.5 V ± 125 mV supply for core ADC; requires 10 µF ceramic bypass to GND. |
| GND (3,6,10,16) | Analog/digital ground | Common return for analog, digital, and reference paths; multiple pins minimize ground impedance. |
| IN+ (4) | Pseudo-differential input | Accepts 0 V to VREF voltage; sampled against IN– during acquisition phase. |
| IN– (5) | Ground sense node | ±100 mV range w.r.t. GND; ties to local or remote ground to reject common-mode noise. |
| REF (7,8) | Reference input | Dual-pin connection for 2.5 V–5.1 V external reference; requires 47 µF X5R ceramic decoupling. |
| CNV (9) | Convert trigger | Rising-edge initiates conversion; also powers up device from auto power-down state. |
| BUSY (11) | Status indicator | Active-high open-drain signal indicating ongoing conversion; logic level set by OVDD. |
| RDL/SDI (12) | Configurable I/O | In normal mode: bus enable; in chain mode: serial data input for daisy-chained ADCs. |
| SCK (13) | Serial clock | Input clock for SPI interface; supports up to 100 MHz (10 ns period) with 4 ns min high time. |
| SDO (14) | Serial data output | MSB-first 16-bit straight-binary output; valid 9.5 ns after SCK↑ (CL = 20 pF). |
| OVDD (15) | I/O supply | 1.71 V–5.25 V digital interface supply; sets logic thresholds for all digital pins. |
| GND (17) | Exposed pad | Thermal and electrical ground connection; mandatory soldering required for spec compliance. |
Key Features
| Feature | Design Value |
|---|---|
| No missing codes at 16 bits | Guaranteed monotonic transfer function across full temperature range - essential for closed-loop control accuracy. |
| Internal conversion clock | Eliminates need for external timing source; simplifies system design and improves jitter immunity. |
| Auto power-down between conversions | Reduces idle current to 0.9 µA (typ), scaling power dissipation linearly with sample rate. |
| SPI-compatible daisy-chain mode | Enables multi-ADC synchronization without additional control lines - ideal for channel expansion in DAQ systems. |
| 1.8 V to 5 V I/O voltage support | Interoperability with mixed-voltage host systems (e.g., 1.8 V FPGA, 3.3 V MCU) without level shifters. |
Applications
| Medical Imaging Signal Chain | Portable Instrumentation |
|---|---|
Use Scenario: Digitizing low-noise analog outputs from ultrasound transducer front-ends or MRI gradient amplifiers. IC Role / Device Role / Timing Role: High-resolution SAR ADC capturing baseband signals with minimal harmonic distortion and aperture jitter. Use Value: 94.7 dB SNR and –118 dB THD preserve weak signal fidelity; 1 Msps throughput supports real-time beamforming. | Use Scenario: Battery-powered handheld multimeters, oscilloscopes, or environmental sensors requiring precision DC/low-frequency AC measurement. IC Role / Device Role / Timing Role: Primary digitizer interfacing with op-amp signal conditioning and microcontroller SPI host. Use Value: 13.5 mW active power and 0.9 µA shutdown current extend battery life; 16-bit resolution enables 0.0015% measurement accuracy. |
| Industrial Process Control | Automated Test Equipment (ATE) |
Use Scenario: Monitoring analog sensor outputs (e.g., pressure, temperature, flow) in PLC I/O modules or distributed control systems. IC Role / Device Role / Timing Role: Isolated analog-to-digital converter in ruggedized field-mounted acquisition nodes. Use Value: Guaranteed operation to 70°C and ±0.75 LSB INL ensure long-term calibration stability in factory environments. | Use Scenario: High-speed parametric testing of semiconductor devices using synchronized multi-channel sampling. IC Role / Device Role / Timing Role: Precision digitizer in ATE mainframe backplane with deterministic latency and daisy-chain scalability. Use Value: No cycle latency and daisy-chain capability allow tight inter-channel timing alignment without complex clock distribution. |
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 |
|---|---|---|---|
| AD7682BCPZ-RL7 | 16-bit, 250 kSPS, 2.5 V supply, SPI interface; lower speed but lower power (1.5 mW @ 250 kSPS). | Targeted at ultra-low-power, sub-1 Msps applications; lacks daisy-chain mode and internal oscillator. | Choose when sampling rate ≤ 250 kSPS suffices and board space/power budget is extremely constrained. |
| ADS8860IRGET | 16-bit, 1 Msps, 2.5–5 V supply, SPI interface; supports pseudo-differential inputs but requires external reference buffer. | Higher THD (–105 dB typ) and lower SNR (91.5 dB typ); no integrated daisy-chain logic. | Consider if cost sensitivity outweighs need for guaranteed 94.7 dB SNR and simplified layout with internal clock. |
Compared with AD7682BCPZ-RL7 and ADS8860IRGET, the LTC2368CDE-16#PBF uniquely combines 1 Msps throughput, 94.7 dB SNR, internal clock, and daisy-chain capability in a compact DFN - making it optimal for high-channel-count, high-fidelity, space-limited systems where timing simplicity and noise performance are critical.
Availability
LTC2368CDE-16#PBF is available at Aetrix Electronics and suitable for medical imaging signal chains, portable instrumentation, and industrial process control systems requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for LTC2368CDE-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 LTC2368 family was designed specifically for high-speed, low-power, high-SNR data acquisition in space-constrained applications - emphasizing ease of use through integrated timing, flexible I/O, and robust pseudo-differential input architecture.
FAQ
What is the maximum sampling rate supported by the LTC2368CDE-16#PBF?
The LTC2368CDE-16#PBF supports a maximum sampling rate of 1 Msps, with guaranteed timing parameters including 460 ns conversion time and 1 µs minimum time between conversions. This rate is fully specified over the 0°C to 70°C operating temperature range and does not require external clocking due to its internal oscillator.
Does the LTC2368CDE-16#PBF require an external reference voltage?
Yes, the LTC2368CDE-16#PBF requires an external reference voltage applied to the REF pins (7 and 8). The reference range is 2.5 V to 5.1 V, and it must be decoupled with a 47 µF X5R ceramic capacitor placed close to the pins. The device draws up to 0.7 mA average reference current at 1 Msps, so the reference source must support this load.
Can the LTC2368CDE-16#PBF operate with a 1.8 V digital interface?
Yes, the LTC2368CDE-16#PBF supports 1.8 V digital logic levels via its OVDD pin (Pin 15), which accepts 1.71 V to 5.25 V. All digital inputs (CNV, CHAIN, SCK, RDL/SDI) and outputs (BUSY, SDO) are referenced to OVDD, enabling direct interfacing with 1.8 V FPGAs or microcontrollers without level-shifting circuitry.
What is the purpose of the IN– pin on the LTC2368CDE-16#PBF?
The IN– pin (Pin 5) serves as a ground-sense node in the LTC2368CDE-16#PBF's pseudo-differential architecture. It has a limited input range of ±100 mV relative to GND and is used to reject common-mode noise by providing a local or remote ground reference - not as a true differential input. It must be tied to the system ground plane or a clean remote ground point.
Is the LTC2368CDE-16#PBF pin-compatible with other variants in the LTC2368 family?
Yes, the LTC2368CDE-16#PBF shares identical pinout and functionality with other DFN-packaged variants (e.g., LTC2368IDE-16#PBF), differing only in temperature grade (0°C to 70°C vs. –40°C to 85°C) and marking. It is not pin-compatible with MSOP-packaged versions (e.g., LTC2368CMS-16#PBF), which have different mechanical dimensions and thermal pad configuration.
LTC2368CDE-16#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:
- 16
- 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 16-DFN (4x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2368CDE-16#PBF FAQ
1.How can I place an order for LTC2368CDE-16#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2368CDE-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 LTC2368CDE-16#PBF reliable?
The price and inventory of LTC2368CDE-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 LTC2368CDE-16#PBF is usually 5 days.
3.What payment methods are accepted for LTC2368CDE-16#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2368CDE-16#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2368CDE-16#PBF?
LTC2368CDE-16#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2368CDE-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 LTC2368CDE-16#PBF?
For technical support, including LTC2368CDE-16#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2368CDE-16#PBF requirements.
6.How does Aetrix verify that LTC2368CDE-16#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2368CDE-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 LTC2368CDE-16#PBF meets industry standards.
7.What is the process for return or replacement of LTC2368CDE-16#PBF?
All LTC2368CDE-16#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2368CDE-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 LTC2368CDE-16#PBF part is unused and in its original packaging.
Return procedure for LTC2368CDE-16#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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