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Analog Devices Inc. LTC2368CMS-18#PBF
- Part No.:
- LTC2368CMS-18#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2368CMS-18#PBF.pdf
- Description:
- IC ADC 18BIT SAR 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,869
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Product details
Overview
LTC2368CMS-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 programmable from 2.5 V to 5.1 V. It serves as the high-precision front-end digitizer in medical imaging and portable instrumentation systems requiring low power and high dynamic range.
For engineers reviewing the LTC2368CMS-18#PBF datasheet, LTC2368CMS-18#PBF pinout, LTC2368CMS-18#PBF application, or LTC2368CMS-18#PBF equivalent, key selection criteria include its 1 Msps throughput with zero cycle latency, internal conversion clock, SPI-compatible daisy-chain interface, and operation across 0°C to 70°C in the 16-lead MSOP package.
Technical Context
The LTC2368CMS-18#PBF implements a charge-redistribution SAR architecture with a pseudo-differential input stage, where IN+ accepts 0 V to VREF and IN– operates as a ground-sense node with ±100 mV range. Its internal oscillator eliminates external timing dependencies, and acquisition/conversion phases are fully synchronized to the CNV rising edge without pipeline delay.
It features dual-supply operation: 2.5 V (VDD) for analog core and 1.8 V–5.25 V (OVDD) for digital I/O, enabling interoperability with mixed-voltage host systems. The SDO output is straight binary, MSB-first, and supports both normal mode (RDL/SDI as bus enable) and daisy-chain mode (RDL/SDI as serial data input) via the CHAIN pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit - provides 262,144 discrete output levels for high-fidelity signal capture |
| Sampling Rate | 1 Msps - enables real-time digitization of signals up to 500 kHz Nyquist bandwidth |
| SNR | 97 dB (typ, fIN = 2 kHz, VREF = 5 V) - ensures >16.1 effective number of bits (ENOB) |
| INL | ±2.5 LSB (max) - guarantees monotonicity and linearity critical for closed-loop control |
| Power Dissipation | 13.5 mW at 1 Msps - enables battery-powered operation with minimal thermal load |
| VREF Range | 2.5 V to 5.1 V - allows flexible full-scale adjustment while maintaining 19 µV LSB (at 5 V) |
| Operating Temp | 0°C to 70°C - qualified for commercial-grade embedded instrumentation use |
Pinout & Package
Package: 16-lead plastic MSOP (3 mm × 4.9 mm), exposed pad not present (DFN variant has exposed pad; MSOP does not).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| CHAIN (1) | Mode selector | High = daisy-chain mode (RDL/SDI becomes SDI); Low = normal mode (RDL/SDI enables SDO) |
| VDD (2) | Analog core supply | 2.5 V ± 125 mV; powers SAR array, reference buffer, and comparator |
| GND (3,6,10,16) | Analog/digital ground | Four dedicated GND pins minimize ground bounce and improve PSRR |
| IN+ (4) | Pseudo-differential input (+) | 0 V to VREF range; samples with 45 pF capacitance and 40 Ω switch resistance |
| IN– (5) | Pseudo-differential input (–) | ±100 mV w.r.t. GND; used for remote ground sensing or common-mode rejection |
| REF (7,8) | Reference voltage inputs | Dual-pinned for low-inductance decoupling; requires 47 µF X5R ceramic capacitor |
| CNV (9) | Convert trigger | Rising-edge initiated; powers up ADC and starts acquisition/conversion sequence |
| BUSY (11) | Conversion status indicator | Active-high pulse (460–527 ns wide); signals when result is ready on SDO |
| RDL/SDI (12) | Configurable serial I/O | Bus-enable input (CHAIN = low) or serial data input (CHAIN = high) |
| SCK (13) | Serial clock input | Accepts 100 MHz max clock (10 ns period); controls MSB-first data shift timing |
| SDO (14) | Serial data output | Three-state, OVDD-referenced; outputs 18-bit straight binary code after BUSY goes low |
| OVDD (15) | Digital I/O supply | 1.71 V to 5.25 V; sets logic thresholds for all digital pins and enables voltage-level translation |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay / zero cycle latency | Enables deterministic real-time control loops without output buffering or timing compensation |
| Internal conversion clock | Removes need for external timing circuitry, simplifying PCB layout and reducing BOM count |
| Auto power-down between conversions | Reduces idle power to <1 µA, scaling dynamically with sampling rate for energy-efficient burst operation |
| SPI-compatible interface with daisy-chain mode | Supports multi-ADC synchronization and compact wiring in channel-dense DAQ systems |
| Guaranteed 18-bit no missing codes | Ensures absolute monotonicity required for precision position feedback and metrology applications |
Applications
| Medical Imaging | Portable Instrumentation |
|---|---|
Use Scenario: Digitizing low-amplitude ultrasound echo signals in handheld scanners with limited battery capacity. IC Role / Device Role / Timing Role: Primary ADC front-end capturing 18-bit echo amplitude data at 1 Msps with minimal added noise. Use Value: 97 dB SNR preserves weak tissue boundary contrast; 13.5 mW power enables >4-hour battery life per charge. | Use Scenario: High-resolution waveform capture in handheld oscilloscopes or spectrum analyzers. IC Role / Device Role / Timing Role: Core sampling engine delivering precise time-aligned 18-bit samples for FFT-based spectral analysis. Use Value: ±2.5 LSB INL ensures accurate amplitude measurement across full scale; daisy-chain mode supports multi-channel sync. |
| Industrial Process Control | Automated Test Equipment (ATE) |
Use Scenario: Monitoring high-stability sensor outputs (e.g., strain gauges, RTDs) in PLC analog input modules. IC Role / Device Role / Timing Role: Precision digitizer interfacing with low-drift external references (e.g., LTC6655-5) for sub-0.01% accuracy. Use Value: VREF range (2.5–5.1 V) accommodates multiple reference topologies; 125°C H-grade variants available for harsh environments. | Use Scenario: High-speed parametric testing of semiconductor devices requiring calibrated DC and AC measurements. IC Role / Device Role / Timing Role: Calibration-grade ADC in source-measure units (SMUs), capturing transient responses with known timing fidelity. Use Value: Internal oscillator ensures consistent tCONV (460–527 ns); no missing codes prevents test false-fail due to code gaps. |
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, 92 dB SNR (typ), no daisy-chain mode | Lacks daisy-chain capability and 2-bit resolution advantage; lower SNR limits ENOB in noise-sensitive applications | Select when 16-bit resolution suffices and system uses TI ecosystem tools |
| AD7960BCPZ-RL7 | 18-bit, 5 Msps, 5 V supply, LVDS/CMOS parallel interface, 96 dB SNR (typ), no internal clock | Higher speed but requires external timing and higher power (43 mW); parallel interface increases routing complexity | Select for ultra-high-throughput systems where board space permits parallel traces and timing design effort is acceptable |
Compared with ADS8860IDRCT and AD7960BCPZ-RL7, the LTC2368CMS-18#PBF uniquely balances 18-bit resolution, 1 Msps throughput, integrated timing, and ultra-low power in a compact MSOP-making it optimal for portable, battery-constrained, and multi-channel precision DAQ designs.
Availability
LTC2368CMS-18#PBF is available at Aetrix Electronics and suitable for medical imaging systems, portable instrumentation, and industrial process control applications requiring stable component supply, long-term lifecycle support, and guaranteed commercial-temperature performance.
Supply support for LTC2368CMS-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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC2368-18 belongs to Linear's precision SAR ADC product line, engineered for applications demanding high resolution, low power, and deterministic timing-especially in portable, medical, and industrial data acquisition.
FAQ
What is the maximum sampling rate supported by the LTC2368CMS-18#PBF?
The LTC2368CMS-18#PBF supports a maximum sampling rate of 1 Msps, with guaranteed timing parameters including tCYC = 1 µs and tCONV = 460–527 ns. This rate is fully characterized over the 0°C to 70°C temperature range and does not require external clocking-its internal oscillator ensures consistent performance without timing margin uncertainty.
Does the LTC2368CMS-18#PBF require an external reference voltage?
Yes, the LTC2368CMS-18#PBF requires an external reference voltage applied to the REF pins (7 and 8). It accepts VREF from 2.5 V to 5.1 V, and performance metrics-including SNR, INL, and THD-are specified with VREF = 5 V. A low-noise, low-drift reference such as the LTC6655-5 is recommended to achieve datasheet specifications.
How does the CHAIN pin affect the serial interface behavior of the LTC2368CMS-18#PBF?
The CHAIN pin (Pin 1) configures the serial interface mode: when low, RDL/SDI functions as a bus-enable input for SDO; when high, RDL/SDI becomes a serial data input for daisy-chain operation. In daisy-chain mode, multiple LTC2368CMS-18#PBF devices can share one SCK and SDO line, with data cascading through RDL/SDI → SDO paths-reducing GPIO count in multi-channel systems.
What power supplies are required for proper operation of the LTC2368CMS-18#PBF?
The LTC2368CMS-18#PBF requires two independent supplies: VDD (Pin 2) must be 2.5 V ± 125 mV to power the analog core, and OVDD (Pin 15) may range from 1.71 V to 5.25 V to set digital I/O logic levels. Both supplies must be bypassed-VDD with a 10 µF ceramic capacitor and OVDD with a 0.1 µF capacitor-to ensure stable operation and low noise performance.
Is the LTC2368CMS-18#PBF pin-compatible with other members of the LTC2368 family?
Yes, the LTC2368CMS-18#PBF shares identical pinout and footprint with other MSOP-packaged variants (e.g., LTC2368IMS-18#PBF, LTC2368HMS-18#PBF), differing only in temperature grade and part marking. All MSOP versions use the same 16-lead configuration, allowing drop-in replacement across commercial (C), industrial (I), and high-temp (H) grades without PCB redesign.
LTC2368CMS-18#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width)
- 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 16-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2368CMS-18#PBF FAQ
1.How can I place an order for LTC2368CMS-18#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2368CMS-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 LTC2368CMS-18#PBF reliable?
The price and inventory of LTC2368CMS-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 LTC2368CMS-18#PBF is usually 5 days.
3.What payment methods are accepted for LTC2368CMS-18#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2368CMS-18#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2368CMS-18#PBF?
LTC2368CMS-18#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2368CMS-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 LTC2368CMS-18#PBF?
For technical support, including LTC2368CMS-18#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2368CMS-18#PBF requirements.
6.How does Aetrix verify that LTC2368CMS-18#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2368CMS-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 LTC2368CMS-18#PBF meets industry standards.
7.What is the process for return or replacement of LTC2368CMS-18#PBF?
All LTC2368CMS-18#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2368CMS-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 LTC2368CMS-18#PBF part is unused and in its original packaging.
Return procedure for LTC2368CMS-18#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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