LTC2365CTS8 - 12-bit 1Msps SAR ADC | Analog Devices
MPN： LTC2365CTS8 ✓ 啟用中LTC2365CTS8 概覽
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.
直接替換替代品，適用於 LTC2365CTS8 — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： LTC2365CTS8 （相同外形與佔位） — 差異在於 Sample Rate, Operating Temperature, Package, RoHS Status, Input Type.
LTC2365ITS8
✅ 直接替換聯絡詢價
查看資料表 →LTC2366CTS8
✅ 直接替換📋 參考替代品（不在目錄中）
LTC2362ITS8
✅ 直接替換聯絡詢價
查看資料表 →LTC2361ITS8
✅ 直接替換聯絡詢價
查看資料表 →LTC2314HTS8-14
✅ 直接替換聯絡詢價
查看資料表 →LTC2365CTS8 最大額定值與電氣特性
| 解析度 | 12 bits |
| Sample Rate | 1 Msps |
| Architecture | SAR (Successive Approximation) |
| Number of Channels | 1 input, 1 SAR |
| 供應電壓 | 2.35 V to 3.6 V (single 3 V supply) |
| 供應電流 | 2 mA typical at 1 Msps |
| Analog Input Range | 0 V to VDD or 0 V to VREF |
| SINAD | 72 dB |
| THD | -80 dB |
| 介面 | High-speed serial (SPI-compatible) |
| 封裝 | TSOT-23-8 |
| 工作溫度 | 0 C to +70 C (C suffix = commercial) |
| 安裝類型 | Surface Mount |
| RoHS 狀態 | Compliant |
| Sample-and-Hold | Integrated high dynamic range |
LTC2365CTS8 腳位配置
| 腳位 1 | CH0 / IN+ — Analog input channel 0 (positive input) |
| 腳位 2 | GND — Ground |
| 腳位 3 | REF — Reference voltage input / output |
| 腳位 4 | VDD — Power supply input (2.35 V to 3.6 V) |
| 腳位 5 | SDO / DOUT — Serial data output |
| 腳位 6 | SCK — Serial clock input |
| 腳位 7 | CONVST — Conversion start input (falling edge initiates conversion) |
| 腳位 8 | AUX / NC — Auxiliary or no-connect pin (per datasheet) |
典型應用
LTC2365CTS8 適用於 6 應用s: 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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
推薦產品摘要
工程參考資料，適用於 LTC2365CTS8 — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | 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 |
主要差異化特點
- Industry-smallest 12-bit 1 Msps ADC footprint (對比LTC2366CTS8)
- Industrial temperature drop-in upgrade (對比LTC2365ITS8)
- Transparent upgrade to 3 Msps throughput (對比LTC2366CTS8)
- Same TSOT-23-8 across resolution tiers (對比LTC2314HTS8-14)
設計說明
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.
合規資訊
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.
