LTC2314CTS8-14 - 14-Bit 4.5Msps SAR ADC | Analog Devices
料号： LTC2314CTS8-14 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $7.95 | $7.95 |
| 10 | $7.16 | $71.60 |
| 100 | $6.35 | $635.00 |
| 500 | $5.7 | $2,850.00 |
| 1,000 | $5.05 | $5,050.00 |
LTC2314CTS8-14 概述
A SAR ADC is a type of analog-to-digital converter that uses a binary search algorithm through an internal capacitive DAC to converge on the input voltage in one conversion cycle per output bit. SAR ADCs offer an excellent trade-off between speed, resolution, and power consumption, making them the converter of choice for multiplexed data acquisition, motor control feedback, and instrumentation front-ends where deterministic latency and single-shot accuracy are required. The LTC2314-14 family represents the high-speed, low-power tier of this architecture, with sample rates in the multi-Msps range and current draws measured in single-digit milliamps.
Key features of the LTC2314CTS8-14 include an integrated bandgap reference and reference buffer delivering 20 ppm/°C maximum drift, an SPI-compatible serial interface supporting 1.8V/2.5V/3V/5V logic levels, and dedicated nap and sleep modes for additional system-level power optimization. The wide 2.7V to 5.25V analog supply range allows the converter to be powered directly from common 3.3V or 5V rails without an additional LDO, simplifying BOM count and PCB area.
Technically, the device combines a high-impedance differential input structure with internal clock generation, eliminating the need for an external ADC clock in most applications. Its low aperture jitter and 14-bit no-missing-codes performance make it well suited for precision measurement loops. The integrated reference buffer drives the internal DAC directly, which preserves INL/DNL performance across the full sample-rate range.
Typical applications include multiplexed data acquisition systems, high-speed isolated voltage monitoring, optical module photodiode readout, and portable medical instrumentation. The TSOT-23-8 footprint enables placement adjacent to sensors, minimizing analog trace length and noise pickup.
When designing with this part, bypass the analog and reference pins with 10 µF and 0.1 µF ceramic capacitors placed as close to the IC as possible, and route the serial clock (SCK) and chip select (CS) away from analog inputs to preserve SNR. According to Analog Devices datasheet 231414fa, the device achieves specified INL/DNL only when the analog supply is decoupled with the recommended capacitor network.
This page synthesizes distributor pricing from DigiKey and Mouser, drop-in pin-compatible alternatives from the same SAR ADC family, and practical PCB design guidance that is not consolidated in the manufacturer datasheet.
直接替换替代料： LTC2314CTS8-14 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： LTC2314CTS8-14 （相同外形与封装尺寸） ——差异在于 Resolution, Operating Temperature Range, RoHS Status, Package, Sample Rate.
快速对比工具——选择替代料号进行并排对比：
LTC2313HTS8-14
✅ 直接替换✓ 有现货
$4.1 / 个
查看数据手册 →LTC2312HTS8-14
✅ 直接替换✓ 有现货
$4.1 / 个
查看数据手册 →LTC2314CTS8-14#PBF
✅ 直接替换📋 参考替代料（不在目录中）
LTC2312HTS8-12
✅ 直接替换✓ 有现货
$4.18 / 个
查看数据手册 →ADCS7478AIMFX
✅ 直接替换✓ 有现货
$0.98 / 个
查看数据手册 →ADCS7478AIMFE
✅ 直接替换✓ 有现货
$4.4267 / 个
查看数据手册 →LTC2314CTS8-14 最大额定值与电气特性
| 分辨率 | 14 bits |
| Sample Rate | 4.5 Msps |
| Architecture | SAR (Successive Approximation Register) |
| Number of Input Channels | 1 |
| Analog Supply Voltage | 2.7 V to 5.25 V |
| 电源电流 | 6.2 mA (typical at 4.5 Msps) |
| Digital I/O Logic Levels | 1.8 V / 2.5 V / 3 V / 5 V |
| Serial Interface | SPI-compatible |
| Integrated Reference | Yes - bandgap + reference buffer |
| Reference Drift | 20 ppm/°C (maximum) |
| Power-Down Modes | Nap and Sleep |
| 封装 | TSOT-23-8 |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
| Lead-Free | Yes (PBF suffix) |
LTC2314CTS8-14 引脚配置
| 引脚 1 | AVDD — Analog power supply, 2.7V to 5.25V |
| 引脚 2 | REF — Reference voltage output (bandgap) |
| 引脚 3 | IN+ — Positive analog input |
| 引脚 4 | IN- — Negative analog input (or GND for single-ended) |
| 引脚 5 | GND — Analog ground |
| 引脚 6 | CNV — Convert / Chip Select input |
| 引脚 7 | SCK — Serial clock input (SPI) |
| 引脚 8 | SDO — Serial data output (SPI) |
典型应用
LTC2314CTS8-14 适用于 6 应用s: Multiplexed Data Acquisition Systems, Portable Medical Instrumentation, Optical Module Photodiode Readout, High-Speed Isolated Voltage Monitoring, Industrial Process Control and Sensor Conditioning, Communications Baseband Signal Digitization.
Multiplexed Data Acquisition Systems
The LTC2314CTS8-14 fits multiplexed data acquisition front-ends where multiple sensor channels must be digitized sequentially at high throughput. Its 4.5 Msps sample rate allows the host to switch an external MUX between sensors and still maintain sub-microsecond settling on each channel. The 14-bit resolution provides 16384 codes of dynamic range, sufficient for strain-gauge bridges, thermocouples via front-end amplifiers, and 4-20 mA loop receivers. The integrated bandgap reference and reference buffer eliminate external precision references, reducing BOM count. According to the Analog Devices datasheet 231414fa, the SPI-compatible interface supports 1.8V-5V logic, allowing direct connection to modern MCUs without level shifters. Nap and sleep modes let the host idle the ADC between scan bursts, reducing average system current.
推荐
Portable Medical Instrumentation
The LTC2314CTS8-14 is well suited to portable medical devices such as pulse oximeters, single-lead ECG front-ends, and handheld diagnostic analyzers. Its 6.2 mA typical supply current at 4.5 Msps keeps battery drain manageable, and the integrated reference buffer minimizes external components - critical for compact wearable form factors. The 14-bit resolution is sufficient to capture QRS complexes and pulse waveforms with adequate dynamic range, and the 2.7V-5.25V analog supply range allows direct operation from a single Li-ion cell. The TSOT-23-8 package fits adjacent to the sensor, keeping analog trace length short and improving SNR. Per the Analog Devices datasheet 231414fa, nap and sleep modes allow the host MCU to duty-cycle the converter, extending battery life between charges.
推荐
Optical Module Photodiode Readout
The LTC2314CTS8-14 provides the conversion stage for optical receivers where a transimpedance amplifier drives a single-ended or differential input. Its 4.5 Msps sample rate captures the modulation envelope of typical fiber-optic and free-space optical links, and the 14-bit resolution yields 84 dB of dynamic range, sufficient to resolve small modulation depths on a high DC photocurrent. The 6.2 mA supply current keeps total module power budget tight, and the TSOT-23-8 footprint fits inside SFP-style module cages. The integrated bandgap reference and reference buffer remove the need for a dedicated reference IC, reducing module cost and PCB area. According to the Analog Devices datasheet 231414fa, the wide analog supply range accepts common 3.3V module rails directly.
推荐
High-Speed Isolated Voltage Monitoring
The LTC2314CTS8-14 serves as the secondary-side converter in isolated voltage and current monitoring modules, where a digital isolator bridges SPI traffic to a host controller. Its 4.5 Msps throughput supports wide-bandwidth control loops in motor drives, solar inverters, and industrial power converters. The 14-bit resolution provides enough codes for accurate RMS, peak, and harmonic analysis on 50/60 Hz and PWM-shaped waveforms. Per the Analog Devices datasheet 231414fa, the digital interface supports 1.8V-5V logic, which simplifies pairing with modern gate-driver and digital-isolator ICs. The TSOT-23-8 package allows the ADC to be placed directly across the sense resistor or voltage divider, minimizing analog routing and improving noise immunity.
推荐
Industrial Process Control and Sensor Conditioning
The LTC2314CTS8-14 digitizes conditioned analog signals from thermocouples, RTDs, strain gauges, and pressure transducers in 4-20 mA loop receivers. Its 14-bit resolution is sufficient for industrial measurement accuracy when paired with a precision front-end amplifier, and the 4.5 Msps sample rate supports oversampling techniques that further improve effective resolution. The 2.7V-5.25V analog supply range simplifies integration with 24V-derived 5V or 3.3V rails common on PLC analog-input cards. According to the Analog Devices datasheet 231414fa, the wide operating temperature range and integrated reference buffer keep performance stable across industrial environments. Nap and sleep modes allow periodic-scan architectures to reduce average current.
推荐
Communications Baseband Signal Digitization
The LTC2314CTS8-14 can digitize baseband I/Q signals in low-cost radio receivers, software-defined radio front-ends, and small-cell base stations where moderate sample rate and high dynamic range are required. At 4.5 Msps, the converter comfortably handles narrowband FM, DMR, and simple digital modulation formats below 2 MHz bandwidth. The 14-bit resolution gives 84 dB SNR, which is adequate for demodulation of moderate-order constellations. Per the Analog Devices datasheet 231414fa, the SPI interface supports 1.8V-5V logic, which aligns with modern baseband DSPs and microcontrollers. The TSOT-23-8 footprint allows placement directly at the antenna or IF chain, reducing analog trace length and improving noise performance.
推荐
推荐产品汇总
工程参考数据： LTC2314CTS8-14 ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | LTC2313HTS8-14 | LTC2312HTS8-14 | LTC2314CTS8-14#PBF | LTC2312HTS8-12 | ADCS7478AIMFX |
|---|---|---|---|---|---|---|
| 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 | 14 bits | 14 bits | 14 bits | 14 bits | 12 bits | 8 bits |
| Sample Rate | 4.5 Msps | 2.5 Msps | 2 Msps | 4.5 Msps | 2 Msps | 1 Msps |
| Architecture | SAR | SAR | SAR | SAR | SAR | SAR |
| Input Channels | 1 | 1 | 1 | 1 | 1 | 1 |
| Analog Supply | 2.7V to 5.25V | 2.7V to 5.25V | 2.7V to 5.25V | 2.7V to 5.25V | 2.7V to 5.25V | 2.7V to 5.25V |
| Integrated Reference | Yes (20 ppm/°C) | Yes | Yes | Yes | Yes | Yes |
关键差异点
- Highest sample rate in the LTC2312/LTC2313/LTC2314 TSOT-23-8 family （对比 LTC2313HTS8-14)
- 2 extra bits of resolution versus 12-bit TSOT-23-8 family members （对比 LTC2312HTS8-12)
- Integrated 20 ppm/°C bandgap reference buffer （对比 ADCS7478AIMFX)
设计说明
Bypass AVDD with a 10 µF ceramic capacitor in parallel with a 0.1 µF ceramic placed as close to the IC as possible, per the Analog Devices datasheet 231414fa. Use a low-ESR ceramic (X5R or X7R) to handle the dynamic current drawn during conversion. A separate analog ground pour that ties to the GND pin at a single point helps reject digital switching noise from the SPI interface.
Route the analog input traces (IN+, IN-) as differential pairs and keep them short and symmetric. The TSOT-23-8 package allows placement directly adjacent to the sensor or front-end amplifier, minimizing trace length. Per the Analog Devices datasheet, achieved SNR is degraded by additional trace capacitance and pickup on the analog inputs, so keeping the package close to the source is the single most effective layout choice.
Route the SPI signals (CNV, SCK, SDO) on a separate layer from the analog input traces and cross them at 90-degree angles only when necessary. Place a small series resistor (22-33 Ω) near the SDO pin to dampen ringing on the serial data line. According to the Analog Devices datasheet 231414fa, the SPI interface supports clock rates up to the value listed in the timing specifications, and clean clock edges preserve the full sample rate and resolution.
Do not leave the REF pin floating - even with the internal bandgap enabled, the datasheet recommends a 10 µF ceramic bypass on REF for optimal noise performance. When using the nap or sleep mode, the host must wait the specified wake-up time before initiating the next conversion, otherwise the first sample after wake-up may be invalid. Single-ended operation requires tying IN- to GND with a short trace.
合规信息
RoHS and REACH compliance confirmed by TRMPBF/PBF part suffix and DigiKey product listing. The standard LTC2314CTS8-14 is not AEC-Q100 qualified; automotive-grade SAR ADC options from ADI typically carry a different suffix. Halogen-free status not explicitly listed in the verified data and marked unknown.
