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Analog Devices Inc. LTC2368IDE-24#PBF
- Part No.:
- LTC2368IDE-24#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC2368IDE-24#PBF.pdf
- Description:
- IC ADC 24BIT SAR 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:122
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Product details
Overview
LTC2368IDE-24#PBF from Analog Devices (formerly Linear Technology) is a 24-bit, 1 Msps pseudo-differential unipolar successive approximation register (SAR) ADC with integrated real-time digital averaging filter, operating from a single 2.5V supply and supporting 2.5V–5.1V reference voltage. It delivers ±4.5 ppm INL max, 98 dB SNR at 1 Msps, and 140 dB dynamic range at 15.25 sps, targeting high-precision data acquisition in seismology and medical imaging systems.
For engineers reviewing the LTC2368IDE-24#PBF datasheet, LTC2368IDE-24#PBF pinout, LTC2368IDE-24#PBF application, or LTC2368IDE-24#PBF equivalent, this page provides verified technical context, package-specific pin functions, confirmed performance trade-offs across averaging modes, and validated alternative options for precision DC-coupled measurement systems requiring guaranteed 24-bit no-missing-codes operation over –40°C to +85°C.
Technical Context
The LTC2368IDE-24#PBF implements a charge-redistribution SAR architecture with a 24-bit CDAC and differential comparator, sampling the IN+–IN– differential voltage (0 V to VREF) while rejecting common-mode noise up to 83 dB at 500 kHz. Its integrated digital filter performs real-time averaging of 1–65536 conversion results without configuration registers or external programming.
Timing is controlled by a rising-edge CNV signal initiating acquisition and conversion; BUSY asserts high during conversion (615–675 ns), and serial output occurs via SPI-compatible SDO/SCK with daisy-chain support enabled by the CHAIN pin. Power management includes automatic power-down between conversions, reducing current to 0.4 mA in standby.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit with guaranteed no missing codes - ensures full monotonicity and integrity of ultra-low-level signal digitization. |
| Sampling Rate | 1 Msps maximum - supports high-speed transient capture while maintaining DC accuracy via programmable averaging. |
| INL Error | ±4.5 ppm max (–40°C to +85°C) - corresponds to <0.3 LSB error at 5V reference, enabling sub-microvolt measurement fidelity. |
| Dynamic Range | 140 dB typical at 15.25 sps (N = 65536) - achieves 23-bit effective resolution for low-frequency, high-stability applications like energy exploration. |
| Power Consumption | 21 mW typical at 1 Msps - enables portable or thermally constrained instrumentation without sacrificing resolution. |
| Reference Range | 2.5 V to 5.1 V - allows direct interface with standard precision references and supports LSB = 0.3 µV at 5V full-scale. |
| Operating Temp | –40°C to +85°C (I-grade) - qualified for industrial and downhole environments where thermal drift must be minimized. |
Pinout & Package
Package: 16-lead (4 mm × 3 mm) plastic DFN with exposed pad (Pin 17 = GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CHAIN (1) | Mode selector | Low = normal SPI mode (RDL/SDI controls SDO bus enable); high = daisy-chain mode (RDL/SDI becomes SDI input). |
| VDD (2) | Analog supply | 2.375 V–2.625 V; powers core ADC and CDAC; requires 10 µF ceramic bypass to GND. |
| GND (3,6,10,16) | Analog/digital ground | Multiple dedicated ground pins minimize ground bounce; exposed pad (Pin 17) must be connected to PCB ground. |
| IN+ (4) | Pseudo-differential analog input (+) | Accepts 0 V to VREF input; modeled as 45 pF switched capacitor + 40 Ω RON; requires matched source impedance ≤50 Ω. |
| IN– (5) | Pseudo-differential analog input (–) | Common-mode sense node; input range ±100 mV vs GND; must connect to local or remote ground plane. |
| REF (7,8) | Reference voltage input | 2.5 V–5.1 V; supplies full-scale reference; requires 47 µF X7R (1210) + 0.1 µF ceramic decoupling. |
| CNV (9) | Convert trigger | Rising edge initiates acquisition and conversion; logic level referenced to OVDD; minimum pulse width 20 ns. |
| BUSY (11) | Conversion status indicator | High during conversion (615–675 ns); used for timing synchronization or interrupt generation. |
| RDL/SDI (12) | Bus control / serial data input | In normal mode: low = enable SDO output; high = tri-state SDO. In chain mode: serial data input from upstream device. |
| SCK (13) | Serial clock input | Supports up to 100 MHz (10 ns period); rising edge clocks out 24-bit straight-binary data on SDO. |
| SDO (14) | Serial data output | MSB-first 24-bit output; Hi-Z when RDL/SDI high (normal mode) or during power-down. |
| OVDD (15) | I/O supply | 1.71 V–5.25 V; sets logic thresholds for all digital pins; bypass with 0.1 µF ceramic to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated digital averaging filter | Real-time averaging of 1–65536 samples without registers or firmware overhead - enables selectable resolution/speed trade-off from 1 Msps to 15.25 sps. |
| Pseudo-differential unipolar input | IN+–IN– range 0 V to VREF with ±100 mV IN– common-mode window - rejects board-level noise while simplifying sensor interfacing vs true differential. |
| 50 Hz/60 Hz rejection | Enabled by integer-number-of-cycles sampling and averaging - eliminates line-frequency interference without external notch filters in energy metering and process control. |
| Single 2.5 V analog supply | Eliminates dual-supply design complexity and associated noise coupling; VDD tolerance ±62.5 mV ensures stability under rail variation. |
| 1.8 V–5 V SPI-compatible I/O | OVDD-independent logic thresholds (0.2×/0.8× OVDD) allow direct interface to FPGA, MCU, or ASIC I/O banks without level shifters. |
| Auto power-down between conversions | Reduces quiescent current to 0.4 mA - cuts average power >99% at low ODR, critical for battery-powered seismic nodes. |
Applications
| Seismology Sensor Node | Medical CT Detector Interface |
|---|---|
Use Scenario: Digitizing low-amplitude, low-frequency vibration signals from geophone arrays deployed in remote field locations. IC Role / Device Role / Timing Role: Primary 24-bit ADC capturing DC-coupled analog outputs from low-noise preamps; uses N = 65536 averaging for 140 dB DR at ~15 sps. Use Value: Enables detection of sub-nanovolt seismic events with guaranteed monotonicity across –40°C to +85°C ambient, eliminating calibration drift in unattended deployments. |
Use Scenario: Converting photodiode current outputs from X-ray scintillation detectors in computed tomography scanners. IC Role / Device Role / Timing Role: High-linearity, low-distortion digitizer for multi-channel detector readout; operates at 1 Msps with N = 1 for fast image frame rates. Use Value: Delivers 98 dB SNR and –116 dB THD at 2 kHz, preserving contrast resolution and minimizing streak artifacts in reconstructed CT images. |
| Energy Exploration Logging Tool | High-Precision Industrial Process Monitor |
Use Scenario: Downhole pressure and temperature sensing in oil/gas well logging tools subjected to extreme thermal cycling. IC Role / Device Role / Timing Role: Precision ADC for bridge-based strain gauges and RTDs; leverages ±4.5 ppm INL and zero-scale error drift of ±0.7 ppb/°C. Use Value: Maintains traceable metrology-grade accuracy over –40°C to +85°C without per-temperature calibration, reducing tool qualification time and cost. |
Use Scenario: Monitoring analog feedback loops in semiconductor fabrication equipment requiring long-term DC stability. IC Role / Device Role / Timing Role: Reference-grade digitizer for closed-loop control of vacuum chamber pressure, gas flow, and RF power. Use Value: 24-bit no-missing-codes guarantee and 124 dB SNR at N = 16 ensure sub-ppm control resolution and immunity to harmonic distortion from switching power supplies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-resolution SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7626BCPZ-RL7 | 2.5 Msps, 16-bit, no integrated averaging; requires external FIFO and digital processing for noise reduction. | Higher speed but lower resolution; lacks real-time averaging - suitable for wideband spectral analysis, not ultra-low-noise DC measurements. | Select when system-level averaging is implemented in FPGA/ASIC and >1 Msps throughput is required. |
| LTC2378-20IMS#PBF | 20-bit, 1 Msps, ±2 ppm INL max, same DFN package and pinout; lower resolution but improved INL spec and lower power (15 mW). | Optimized for applications needing <1 ppm INL drift over temperature but tolerating 4-bit resolution loss (e.g., precision DAC validation). | Select when 20-bit resolution suffices and tighter INL drift (<±0.5 ppm/°C) is prioritized over absolute bit count. |
Compared with LTC2368IDE-24#PBF, AD7626BCPZ-RL7 trades resolution for speed and offloads filtering, while LTC2378-20IMS#PBF reduces resolution to achieve better INL stability and lower power - making LTC2368IDE-24#PBF uniquely suited for applications demanding both 24-bit integrity and configurable dynamic range via on-chip averaging.
Availability
LTC2368IDE-24#PBF is available at Aetrix Electronics and suitable for seismology sensor nodes, medical CT detector interfaces, and energy exploration logging tools requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2368IDE-24#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 semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC2368 family was designed specifically for high-accuracy, low-power data acquisition in harsh environments - emphasizing guaranteed 24-bit no-missing-codes operation, integrated noise reduction, and robust thermal performance from –40°C to +85°C.
FAQ
What is the guaranteed operating temperature range for LTC2368IDE-24#PBF?
The LTC2368IDE-24#PBF is rated for –40°C to +85°C operation (I-grade), with all key specifications - including ±4.5 ppm INL max, 24-bit no missing codes, and 21 mW power consumption - guaranteed across this full range. This makes LTC2368IDE-24#PBF suitable for industrial and downhole applications where ambient temperature extremes are expected.
Does LTC2368IDE-24#PBF require external configuration registers to use the digital averaging filter?
No, LTC2368IDE-24#PBF does not require external configuration registers or software initialization to use the digital averaging filter. The number of averages (N = 1 to 65536) is set dynamically via the CNV timing sequence and internal state machine - no SPI writes, no registers, and no firmware overhead are needed to enable real-time averaging.
Can LTC2368IDE-24#PBF interface directly with a 1.8 V microcontroller SPI port?
Yes, LTC2368IDE-24#PBF supports 1.8 V logic levels directly: its OVDD supply accepts 1.71 V–5.25 V, and digital input thresholds are defined as 0.2×OVDD (low) and 0.8×OVDD (high). With OVDD = 1.8 V, VIH = 1.44 V and VIL = 0.36 V - fully compatible with standard 1.8 V CMOS I/O without level shifters.
What is the purpose of the IN– pin on LTC2368IDE-24#PBF, and how should it be connected?
The IN– pin on LTC2368IDE-24#PBF serves as the pseudo-differential common-mode sense node, with an absolute input range of ±100 mV relative to GND. It must be connected directly to the local PCB ground plane or to a remote ground reference point near the signal source - not left floating or tied to VREF - to maintain specified CMRR (83 dB at 500 kHz) and INL performance.
How does the power-down feature of LTC2368IDE-24#PBF reduce system power consumption?
LTC2368IDE-24#PBF automatically enters power-down mode between conversions, reducing total supply current from 10 mA (active) to 0.4 mA (standby). At low output data rates (e.g., 1 kSPS), this cuts average power by >95%, extending battery life in portable instrumentation while retaining full wake-up readiness on the next CNV edge.
LTC2368IDE-24#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:
- 24
- 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-24#PBF FAQ
1.How can I place an order for LTC2368IDE-24#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2368IDE-24#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-24#PBF reliable?
The price and inventory of LTC2368IDE-24#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-24#PBF is usually 5 days.
3.What payment methods are accepted for LTC2368IDE-24#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2368IDE-24#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2368IDE-24#PBF?
LTC2368IDE-24#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2368IDE-24#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-24#PBF?
For technical support, including LTC2368IDE-24#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2368IDE-24#PBF requirements.
6.How does Aetrix verify that LTC2368IDE-24#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2368IDE-24#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-24#PBF meets industry standards.
7.What is the process for return or replacement of LTC2368IDE-24#PBF?
All LTC2368IDE-24#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2368IDE-24#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-24#PBF part is unused and in its original packaging.
Return procedure for LTC2368IDE-24#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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