LTC2365CTS8 - 12-bit 1Msps SAR ADC | Analog Devices
MPN: LTC2365CTS8 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.95 | $7.95 |
| 10 | $7.15 | $71.50 |
| 100 | $6.4 | $640.00 |
| 500 | $5.75 | $2,875.00 |
| 1,000 | $5.1 | $5,100.00 |
LTC2365CTS8 Overview
An ADC (Analog-to-Digital Converter) is a mixed-signal integrated circuit that converts continuous analog voltages into binary digital words; the SAR (Successive Approximation Register) architecture is one of the most widely used ADC topologies, valued for its deterministic latency, low power, and ability to deliver medium-to-high resolution at multi-Msample/s rates. Within the broader hierarchy, the LTC2365 sits in the SAR ADC -> data converter -> mixed-signal IC -> semiconductor family, sharing this category with 12-, 14-, and 16-bit precision converters from Analog Devices, Texas Instruments, and Maxim.
Key features of the LTC2365CTS8 include a high dynamic range sample-and-hold circuit, a high-speed serial SPI-compatible interface, 2 mA typical supply current, and the industry's smallest footprint for a 12-bit 1 Msps ADC - the 8-lead TSOT-23 surface-mount package measuring only 2.9 mm × 2.8 mm. These characteristics are engineered for space-limited, low-power precision applications such as instrumentation front-ends, sensor signal chains, and portable data-acquisition systems.
The LTC2365CTS8 employs a charge-redistribution SAR core with an integrated sample-and-hold amplifier. Conversion is initiated on the falling edge of CONVST and the result is clocked out via a serial interface (SCK and SDO), enabling direct connection to most microcontrollers, DSPs, or FPGAs without glue logic. Internal reference buffering simplifies external BOM.
Typical applications include industrial process control loops, portable medical instrumentation, automotive sensor interfaces, optical module monitoring, multichannel data-acquisition cards, and isolated ADC front-ends driven by digital isolators.
When designing with this device, pay close attention to PCB layout: keep analog and digital grounds separated, decouple VDD close to the IC with a 0.1 uF ceramic capacitor, and treat the REF pin carefully to avoid injection of digital switching noise. The TSOT-23 package has low thermal mass, so avoid sustained sampling at the absolute maximum ratings without adequate PCB copper area.
This page synthesizes distributor pricing, drop-in TSOT-23 alternatives, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for LTC2365CTS8 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with LTC2365CTS8 (same form factor and footprint) — differing in Sample Rate, Operating Temperature, Package, RoHS Status, Input Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LTC2365ITS8
✅ Drop-In✓ In Stock
$3.58 / Unit
View Datasheet →LTC2366CTS8
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2362ITS8
✅ Drop-In✓ In Stock
$3.58 / Unit
View Datasheet →LTC2361ITS8
✅ Drop-In✓ In Stock
$2.62 / Unit
View Datasheet →LTC2314HTS8-14
✅ Drop-In✓ In Stock
$4.4 / Unit
View Datasheet →LTC2365CTS8 Maximum Ratings & Electrical Characteristics
| Resolution | 12 bits |
| Sample Rate | 1 Msps |
| Architecture | SAR (Successive Approximation) |
| Number of Channels | 1 input, 1 SAR |
| Supply Voltage | 2.35 V to 3.6 V (single 3 V supply) |
| Supply Current | 2 mA typical at 1 Msps |
| Analog Input Range | 0 V to VDD or 0 V to VREF |
| SINAD | 72 dB |
| THD | -80 dB |
| Interface | High-speed serial (SPI-compatible) |
| Package | TSOT-23-8 |
| Operating Temperature | 0 C to +70 C (C suffix = commercial) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Sample-and-Hold | Integrated high dynamic range |
LTC2365CTS8 Pin Configuration
| Pin 1 | CH0 / IN+ — Analog input channel 0 (positive input) |
| Pin 2 | GND — Ground |
| Pin 3 | REF — Reference voltage input / output |
| Pin 4 | VDD — Power supply input (2.35 V to 3.6 V) |
| Pin 5 | SDO / DOUT — Serial data output |
| Pin 6 | SCK — Serial clock input |
| Pin 7 | CONVST — Conversion start input (falling edge initiates conversion) |
| Pin 8 | AUX / NC — Auxiliary or no-connect pin (per datasheet) |
Typical Applications
LTC2365CTS8 is suitable for 6 applications: Industrial Process Control, Portable Medical Instrumentation, Automotive Sensor Interfaces, Optical Module Monitoring, Multichannel Data Acquisition, Isolated ADC Front-Ends.
Industrial Process Control
The LTC2365CTS8 fits industrial process-control front-ends because its 1 Msps sampling and 72 dB SINAD capture fast PLC analog signals with low distortion. The TSOT-23-8 footprint enables compact I/O modules, and 2 mA supply current simplifies thermal design inside sealed enclosures. According to the Analog Devices datasheet, the SPI-compatible serial interface (SCK/SDO/CONVST) connects directly to industrial MCUs and isolated digital interfaces for 4-20 mA loop readback, valve position feedback, and pressure/temperature transducers.
Recommended
Portable Medical Instrumentation
The LTC2365CTS8 suits portable medical devices where PCB area is critical: its TSOT-23-8 footprint is the industry's smallest 12-bit 1 Msps ADC package, and 2 mA supply current preserves battery life on patient monitors, pulse oximeters, and bedside diagnostics. With 72 dB SINAD and -80 dB THD per the Analog Devices datasheet, the part digitizes photodiode, ECG, and bio-impedance signals at full 1 Msps. The serial interface reduces pin count, leaving more GPIO for displays, BLE radios, or haptic drivers.
Recommended
Automotive Sensor Interfaces
For under-the-hood and chassis sensor modules, the LTC2365CTS8 delivers 12-bit resolution at 1 Msps with a 0 C to +70 C commercial temperature range suitable for cabin electronics. The single 3 V supply simplifies power-tree design on CAN/LIN sensor nodes, and the SPI-compatible serial interface integrates with most automotive microcontrollers. For under-hood AEC-Q100 requirements, choose the industrial-temp LTC2365ITS8 instead - same TSOT-23-8 footprint, drop-in compatible, with -40 C to +85 C operation.
Recommended
Optical Module Monitoring
In optical transceiver modules, the LTC2365CTS8 monitors laser bias current, TEC voltage, and received optical power through 12-bit 1 Msps conversion. The 0 V to VREF analog input range directly interfaces current-sense amplifiers, and the TSOT-23-8 footprint fits SFP/QSFP module PCBs. According to the Analog Devices datasheet, the high-speed serial interface (SCK/SDO/CONVST) ties cleanly to the host MCU's SPI peripheral, enabling in-service DOM (digital optical monitoring) reads.
Recommended
Multichannel Data Acquisition
Multichannel DAQ cards stack the LTC2365CTS8 for parallel sampling of strain gauges, thermocouples, and load cells. Each ADC provides an independent 1 Msps conversion path in a small TSOT-23-8 footprint, and the serial interface allows sharing one MCU's SPI bus across many ADCs via independent CONVST gating. The 72 dB SINAD figure (per Analog Devices datasheet) keeps effective resolution above 11.7 bits, sufficient for industrial weighing and vibration monitoring systems.
Recommended
Isolated ADC Front-Ends
The LTC2365CTS8 sits on the isolated side of digital isolators, digitizing field signals and streaming serial data back to the safe-side MCU across an iCoupler barrier. Its low 2 mA current consumption simplifies powering the isolated domain from a small isolated DC/DC, and the TSOT-23-8 footprint minimizes isolated-board area. With -80 dB THD per the Analog Devices datasheet, the part introduces negligible distortion into industrial inverter and motor-drive feedback paths.
Recommended
Recommended Products Summary
Engineering reference data for LTC2365CTS8 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTC2365ITS8 | LTC2366CTS8 | LTC2362ITS8 | LTC2361ITS8 | LTC2314HTS8-14 |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | TSOT-23-8 | TSOT-23-8 (same) | TSOT-23-8 (same) | TSOT-23-8 (same) | TSOT-23-8 (same) | TSOT-23-8 (same) |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 14 bits |
| Interface | SPI-compatible serial (SCK/SDO/CONVST) | SPI-compatible serial | SPI-compatible serial | SPI-compatible serial | SPI-compatible serial | SPI-compatible serial |
Key Differentiators
- Industry-smallest 12-bit 1 Msps ADC footprint (vs LTC2366CTS8)
- Industrial temperature drop-in upgrade (vs LTC2365ITS8)
- Transparent upgrade to 3 Msps throughput (vs LTC2366CTS8)
- Same TSOT-23-8 across resolution tiers (vs LTC2314HTS8-14)
Design Notes
Decouple VDD with a 0.1 uF X7R ceramic capacitor placed as close as possible to pin 4; for multi-ADC boards, add a bulk 1 uF to 10 uF tantalum or ceramic near the ADC cluster. The LTC2365CTS8 draws only 2 mA during conversion, so a small low-dropout regulator is sufficient. Tie unused digital pins (if applicable) to GND with a 10 kohm pull-down to prevent injection of digital switching noise into the analog front-end.
Keep analog and digital grounds separated and join them only at a single point near the ADC GND pin (pin 2). Route the analog input (pin 1) directly to the front-end amplifier output without crossing digital traces. Keep REF (pin 3) traces short and shield them with a GND guard ring. The TSOT-23-8 package has pin 1 at the top-left edge (per standard SOT marking convention); refer to the package diagram in the Analog Devices datasheet when laying out the land pattern.
Do not exceed 3.6 V on VDD (pin 4) - absolute maximum rating. The CONVST input (pin 7) should not be left high; it must toggle to initiate conversion, otherwise the ADC stays idle. Reference voltage on pin 3 must be stable - bypass with a 10 uF ceramic if sourcing from an external reference. The 0 C to +70 C commercial temperature grade means designs operating below 0 C must use the LTC2365ITS8 instead.
For best 72 dB SINAD performance, ensure SCK (pin 6) is free from ringing - add a small series damping resistor (33 ohm) if the SPI bus is long. SDO (pin 5) edges should be monotonic; series termination at the ADC end is usually unnecessary. Avoid running SCK parallel to noisy switching rails; cross them at 90 degrees if possible. Per Analog Devices, the integrated sample-and-hold rejects aperture-jitter up to the rated throughput.
Compliance Information
RoHS compliant per Analog Devices product page. Not AEC-Q100 qualified - the LTC2365CTS8 is commercial grade. For automotive applications, choose the industrial-temperature LTC2365ITS8 (still not AEC-Q100); consult Analog Devices automotive portfolio for AEC-Q100 alternatives.
