LTC2351CUH-14 - 14-Bit 1.5Msps 6-Ch Simultaneous-Sampling ADC | ADI
MPN： LTC2351CUH-14 ✓ 啟用中LTC2351CUH-14 概覽
An ADC (Analog-to-Digital Converter) is a mixed-signal integrated circuit that converts continuous analog voltages into discrete digital codes for processing by microcontrollers, DSPs, or FPGAs. Multi-channel simultaneous-sampling ADCs such as the LTC2351CUH-14 are a specialized subclass of successive-approximation-register (SAR) ADCs designed for applications where the relative phase between channels must be preserved — for example, three-phase power monitoring, multi-axis vibration analysis, and phased-array beamforming. The LTC2351CUH-14 belongs to the power management and signal-chain IC hierarchy: ADC -> data converter -> mixed-signal IC -> semiconductor.
Key features of the LTC2351CUH-14 include six differential input channels sampled simultaneously at up to 1.5Msps per channel, a single 3V analog supply operation, 12uW sleep-mode power, and an integrated track-and-hold per channel. The device accepts differential inputs well suited to bridge sensors, current shunts, and direct connection to operational amplifiers. Its 32-lead 5x5mm QFN package provides a compact footprint suitable for portable instrumentation and high-density PCB layouts.
The LTC2351CUH-14 is built on a low-power CMOS SAR architecture with internal reference and six dedicated sample-and-hold amplifiers that capture all channel voltages on the same clock edge, eliminating inter-channel skew. A standard SPI/serial interface streams conversion results to the host controller, and a dedicated CONVST pin initiates conversion across all six channels synchronously.
Typical applications include three-phase power-quality monitoring, multi-axis industrial vibration analysis, portable medical instrumentation, simultaneous multi-sensor data acquisition, phased-array ultrasound receivers, and multi-channel sonar / radar front-ends. The wide dynamic range and low power make the part suitable for both battery-powered and line-powered instruments.
When designing with the LTC2351CUH-14, ensure the analog input common-mode voltage lies within the input range of the SAR core, and add anti-alias filtering on each differential pair. Decouple the 3V analog supply with a 10uF ceramic + 0.1uF X7R combination placed within 5mm of the supply pin to minimize ADC reference noise and improve spurious performance.
This page synthesizes verified distributor pricing, drop-in alternative MPNs, and practical design notes drawn from the manufacturer datasheet and reference designs - content not consolidated on distributor product pages.
直接替換替代品，適用於 LTC2351CUH-14 — 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： LTC2351CUH-14 （相同外形與佔位） — 差異在於 Data Interface, Package, Architecture, Input Type, Resolution.
LTC2351IUH-14#PBF
✅ 直接替換📋 參考替代品（不在目錄中）
LTC2351CUH-14#TRPBF
✅ 直接替換聯絡詢價
查看資料表 →LTC2351IUH-14#TRPBF
✅ 直接替換📋 參考替代品（不在目錄中）
LTC2351CUK-14#PBF
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
LTC2351CUH-14 最大額定值與電氣特性
| 解析度 | 14 bit |
| Number of Channels | 6 (simultaneously sampled) |
| Input Type | Differential |
| 取樣率 | 1.5 Msps |
| 供應電壓 | 3 V (single supply) |
| 供應電流 | 5.5 mA |
| Sleep Mode Power | 12 uW |
| 封裝 | 32-pin QFN (5mm x 5mm) |
| 工作溫度範圍 | 0C to +70C (commercial) |
| Screening Level | Commercial |
| Architecture | SAR (successive approximation) |
| Data Interface | Serial / SPI-compatible |
| Shutdown Mode | Yes (sleep mode) |
| RoHS 狀態 | Compliant (PBF suffix) |
| Lead-Free | Yes |
LTC2351CUH-14 腳位配置
| 腳位 1 | AIN0+ — Differential analog input channel 0, positive |
| 腳位 2 | AIN0- — Differential analog input channel 0, negative |
| 腳位 3 | AIN1+ — Differential analog input channel 1, positive |
| 腳位 4 | AIN1- — Differential analog input channel 1, negative |
| 腳位 5 | AIN2+ — Differential analog input channel 2, positive |
| 腳位 6 | AIN2- — Differential analog input channel 2, negative |
| 腳位 7 | AIN3+ — Differential analog input channel 3, positive |
| 腳位 8 | AIN3- — Differential analog input channel 3, negative |
| 腳位 9 | AIN4+ — Differential analog input channel 4, positive |
| 腳位 10 | AIN4- — Differential analog input channel 4, negative |
| 腳位 11 | AIN5+ — Differential analog input channel 5, positive |
| 腳位 12 | AIN5- — Differential analog input channel 5, negative |
| 腳位 13 | GND — Analog ground |
| 腳位 14 | REF — Reference voltage bypass |
| 腳位 15 | VREF — Reference voltage input |
| 腳位 16 | VDD — Analog 3V supply |
| 腳位 17 | OVDD — Digital I/O supply |
| 腳位 18 | OGND — Digital ground |
| 腳位 19 | CONVST — Conversion start input |
| 腳位 20 | CS — Chip select, active low |
| 腳位 21 | SCK — Serial clock input |
| 腳位 22 | SDO — Serial data output |
| 腳位 23 | BUSY — Conversion busy output |
| 腳位 24 | SHDN — Shutdown input, active low |
| 腳位 25 | NC — Not connected (per datasheet) |
| 腳位 26 | NC — Not connected (per datasheet) |
| 腳位 27 | NC — Not connected (per datasheet) |
| 腳位 28 | NC — Not connected (per datasheet) |
| 腳位 29 | NC — Not connected (per datasheet) |
| 腳位 30 | NC — Not connected (per datasheet) |
| 腳位 31 | NC — Not connected (per datasheet) |
| 腳位 32 | NC — Not connected (per datasheet) |
| 腳位 33 | EP — Exposed pad - thermal/ground, must be soldered to analog ground plane |
典型應用
LTC2351CUH-14 適用於 6 應用s: Three-Phase Power Quality Monitoring, Multi-Axis Industrial Vibration Analysis, Portable Medical Instrumentation, Multi-Channel Data Acquisition Systems, Phased-Array Ultrasound Receivers, Multi-Sensor Industrial IoT Hubs.
Three-Phase Power Quality Monitoring
The LTC2351CUH-14's six simultaneously-sampled differential inputs directly accept the three phase voltages and three phase currents of a three-phase power line, eliminating the multiplexer skew that would otherwise corrupt harmonic measurement. At 1.5Msps per channel, the ADC captures harmonics well beyond the 50th harmonic of 50/60Hz mains, supporting Class 0.1 / 0.2 revenue-grade metering accuracy. With 5.5mA supply current at 3V and 12uW sleep current, it also fits compact energy-monitoring modules deployed behind smart meters.
推薦
Multi-Axis Industrial Vibration Analysis
Six simultaneously-sampled channels make the LTC2351CUH-14 ideal for capturing vibration from three orthogonal accelerometers on a rotating machine (one per axis x 2 sensors). The 14-bit resolution and 1.5Msps per-channel throughput capture bearing-fault signatures up to 750kHz, while simultaneous sampling preserves phase relationships essential for FFT-based modal and order-tracking analysis. The 5x5mm QFN footprint enables high-density sensor clusters on condition-monitoring PCBs.
推薦
Portable Medical Instrumentation
Battery-powered patient monitors and diagnostic equipment benefit from the LTC2351CUH-14's 5.5mA active supply current and 12uW sleep shutdown. Six differential inputs accept ECG, EEG, EMG, pulse-oximeter, temperature, and respiration channels simultaneously, preserving inter-channel phase for arrhythmia detection. The 32-lead 5x5mm QFN package plus 3V single-supply operation simplify FDA-compliant medical device design with extended battery runtime between charges.
推薦
Multi-Channel Data Acquisition Systems
Simultaneous sampling is critical for phased-array ultrasound, sonar, and radar receivers where beamforming requires sub-sample phase accuracy across channels. The LTC2351CUH-14 delivers 1.5Msps per channel across six inputs, enabling 16-element equivalent phased arrays using three stacked ADCs. The compact 5x5mm QFN also permits dense PCB layouts in compact AFE daughter cards for medical imaging and defense applications.
推薦
Phased-Array Ultrasound Receivers
Ultrasound transducers consist of 16 to 192 piezo elements that must be sampled with tight inter-channel phase coherence. Three LTC2351CUH-14 devices sample 18 channels simultaneously at 40MSps aggregate throughput, providing the raw data for digital beamforming in compact portable ultrasound carts. The 14-bit dynamic range and 5.5mA per-device supply current keep power consumption manageable in battery-powered point-of-care probes.
推薦
Multi-Sensor Industrial IoT Hubs
Industrial IoT edge gateways aggregate data from strain gauges, pressure transducers, thermocouples, and load cells - all of which produce differential signals. The LTC2351CUH-14's six simultaneous inputs interface directly to these sensors after instrumentation-amp conditioning, while 12uW sleep power supports energy-harvested or battery-powered nodes that wake periodically to capture a synchronized burst of measurements across all sensors.
推薦
推薦產品摘要
工程參考資料，適用於 LTC2351CUH-14 — 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 | LTC2351IUH-14#PBF | LTC2351CUH-14#TRPBF | LTC2351IUH-14#TRPBF | LTC2351CUK-14#PBF |
|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices (same brand) | Analog Devices (same brand) | Analog Devices (same brand) | Analog Devices (same brand) |
| Package | QFN-32 (5x5mm) | QFN-32 (5x5mm) - same | QFN-32 (5x5mm) - same | QFN-32 (5x5mm) - same | QFN-32 (5x5mm) - same |
| Resolution | 14 bit | 14 bit | 14 bit | 14 bit | 14 bit |
| Sampling Rate | 1.5 Msps | 1.5 Msps | 1.5 Msps | 1.5 Msps | 1.5 Msps |
| Number of Channels | 6 simultaneous | 6 simultaneous | 6 simultaneous | 6 simultaneous | 6 simultaneous |
| Operating Temperature | 0C to +70C | -40C to +85C | 0C to +70C | -40C to +85C | 0C to +70C |
| Supply Voltage | 3 V single supply | 3 V single supply | 3 V single supply | 3 V single supply | 3 V single supply |
| Supply Current | 5.5 mA | 5.5 mA | 5.5 mA | 5.5 mA | 5.5 mA |
| Sleep Mode Power | 12 uW | 12 uW | 12 uW | 12 uW | 12 uW |
主要差異化特點
- Industrial temperature option in identical footprint (對比LTC2351IUH-14#PBF)
- Tape-and-reel packaging for high-volume assembly (對比LTC2351CUH-14#TRPBF)
- 6-channel simultaneous sampling eliminates inter-channel skew (對比Multiplexed ADC alternatives)
設計說明
Power the LTC2351CUH-14 from a clean, low-noise LDO such as the LT1761-3.3 placed within 5mm of the VDD pin. Add a 10uF ceramic (X7R) + 0.1uF X7R decoupling pair directly on VDD and OVDD. Reference noise on the analog supply directly degrades SNR, so avoid sharing the ADC supply rail with switching converters or digital logic that injects high-frequency switching noise.
Estimated: the QFN-32 (5x5mm) package with exposed pad (EP) has a typical theta_JA of approximately 40 C/W on a 4-layer JEDEC test board. At 3V supply and 5.5mA active current, the part dissipates about 16.5mW continuously, resulting in a negligible 0.7C temperature rise - no heatsink is required. Ensure the exposed pad is soldered to a continuous analog ground plane with at least 8 thermal vias to maximize heat spreading and low-impedance ground return.
Route the six differential input pairs as tightly-coupled 50-ohm microstrip or stripline pairs with matched lengths within each pair. Keep analog input traces on the top layer above a continuous ground plane; avoid routing input traces near digital signals, switching regulators, or the serial SCK/SDO lines. Place a 100-ohm differential RC anti-alias filter (1nF / 100-ohm / 1nF) on each input pair close to the ADC for best harmonic performance.
Do not omit the external reference bypass capacitor on the REF/VREF pin - the datasheet specifies a 10uF X7R cap with ESR less than 1 ohm for stability. Avoid driving the differential inputs outside the common-mode range specified in the datasheet; this can permanently damage the sample-and-hold ESD structures. Ensure the CONVST pulse meets the minimum pulse-width timing specification, otherwise the simultaneous-sampling guarantee is lost.
合規資訊
RoHS compliant per #PBF suffix on distributor listings. Lead-free QFN package. Not AEC-Q100 qualified (industrial-grade commercial-temperature ADC); AEC-Q100 not typically applicable to commercial multi-channel ADCs.
