LTC2344CUH-16 - Quad 16-Bit 400ksps/ch SoftSpan SAR ADC | Analog Devices
MPN： LTC2344CUH-16 ✓ 啟用中LTC2344CUH-16 概覽
What is a SAR ADC? A successive-approximation-register analog-to-digital converter is a precision data converter that performs a binary search through an internal capacitive network, comparing the sampled input against an internal DAC one bit per clock cycle to converge on the digital output. SAR ADCs sit in the broader ADC family alongside delta-sigma, pipeline, and flash converters; they offer an excellent balance of resolution (16-20 bits), sampling rate (100 ksps to multi-MB ms), latency (single-cycle, deterministic), and power consumption, which is why they dominate multiplexed data-acquisition, industrial instrumentation, and high-speed control-loop applications.
Key features include per-channel independent input ranges, true simultaneous sampling across all four ADCs, an integrated precision reference and reference buffer, pin-selectable SPI/LVDS interface, and configurable one-to-four-lane CMOS output for bus-width optimization. The combination of 93.4 dB SNR and 102 dB CMRR allows the part to directly digitize wide common-mode signals in noisy industrial environments without front-end signal conditioning.
Typical applications include industrial process control and multichannel data acquisition systems, medical instrumentation such as patient monitoring and ECG/EMG front ends, optical networking, and multi-axis motor control. The simultaneous-sampling architecture is particularly valuable in three-phase power monitoring and vibration analysis where channel-to-channel phase relationships must be preserved.
When designing with this device, place the internal reference bypass capacitor and decoupling capacitors close to the pins and follow the Analog Devices reference layout for the exposed pad. The SoftSpan per-channel range control requires writing the range register between conversions, which must be accounted for in software timing. Pricing and availability data are quoted as of 2026-10-13.
This page synthesizes distributor stock, drop-in same-package alternatives, and design considerations not collected in the manufacturer datasheet alone.
直接替換替代品，適用於 LTC2344CUH-16 — 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： LTC2344CUH-16 （相同外形與佔位） — 差異在於 Operating Temperature Range, Number of Channels, Package, Input Range (SoftSpan), Analog Supply Voltage.
LTC2344CUH-16#TRPBF
✅ 直接替換📋 參考替代品（不在目錄中）
LTC2344IUK-16
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
LTC2344CUH-18
✅ 直接替換聯絡詢價
查看資料表 →LTC2341HUH-18
✅ 直接替換聯絡詢價
查看資料表 →LTC2335HLX-16
✅ 直接替換聯絡詢價
查看資料表 →LTC2344CUH-16 最大額定值與電氣特性
| 解析度 | 16 bits |
| Number of Channels | 4 |
| Sampling Rate (per channel) | 400 ksps |
| Architecture | SAR (Successive Approximation Register) |
| Input Type | Differential, wide common-mode range, SoftSpan |
| Input Range (SoftSpan) | 0V-5.12V up to ±10.24V, per-conversion selectable |
| INL (積分非線性) | ±1.25 LSB |
| SNR (Signal-to-Noise Ratio) | 93.4 dB |
| CMRR (Common-Mode Rejection) | 102 dB |
| No Missing Codes | 16 bits guaranteed |
| Analog Supply Voltage | 4.75 V to 5.25 V (5 V typical) |
| Digital Supply Voltage | 1.8 V to 5 V |
| Serial Interface | SPI CMOS (1.8V-5V) and LVDS, pin-selectable |
| CMOS Output Lanes | 1 to 4, user-configurable |
| 封裝 | 32-QFN (5x5 mm) with exposed pad |
| 安裝類型 | Surface Mount |
| 工作溫度範圍 | -40 °C to +125 °C (C grade) |
| RoHS 狀態 | Compliant (Pb-free #PBF suffix) |
LTC2344CUH-16 腳位配置
| 腳位 1 | IN1+ — Differential analog input 1, positive |
| 腳位 2 | IN1- — Differential analog input 1, negative |
| 腳位 3 | IN2+ — Differential analog input 2, positive |
| 腳位 4 | IN2- — Differential analog input 2, negative |
| 腳位 5 | IN3+ — Differential analog input 3, positive |
| 腳位 6 | IN3- — Differential analog input 3, negative |
| 腳位 7 | IN4+ — Differential analog input 4, positive |
| 腳位 8 | IN4- — Differential analog input 4, negative |
| 腳位 9 | REF — Reference voltage output, requires bypass capacitor |
| 腳位 10 | GND — Analog ground |
| 腳位 11 | OVDD — Digital I/O supply voltage (1.8V-5V) |
| 腳位 12 | GND — Digital ground |
| 腳位 13 | SDO — Serial data output (CMOS) / LVDS output |
| 腳位 14 | SDO- — LVDS complementary serial data output |
| 腳位 15 | SCK — Serial clock input (CMOS) / LVDS clock input |
| 腳位 16 | SCK- — LVDS complementary serial clock input |
| 腳位 17 | SDI — Serial data input for configuration |
| 腳位 18 | CNV — Conversion start input |
| 腳位 19 | BUSY — Conversion busy indicator (CMOS) / LVDS busy |
| 腳位 20 | BUSY- — LVDS complementary busy indicator |
| 腳位 21 | MODE — Interface mode select (CMOS/LVDS) |
| 腳位 22 | LVDS/CMOS — Interface type select pin |
| 腳位 23 | RST — Reset input |
| 腳位 24 | RDL — Read lane select |
| 腳位 25 | GAIN — Gain select for SoftSpan range |
| 腳位 26 | REFBUF — Reference buffer bypass |
| 腳位 27 | AVDD — Analog supply voltage (5V) |
| 腳位 28 | AVDD — Analog supply voltage (5V) |
| 腳位 29 | GND — Analog ground |
| 腳位 30 | GND — Analog ground |
| 腳位 31 | NC — Not connected (per datasheet) |
| 腳位 32 | NC — Not connected (per datasheet) |
典型應用
LTC2344CUH-16 適用於 6 應用s: Multichannel Industrial Data Acquisition, Medical Patient Monitoring and ECG/EMG Front Ends, Three-Phase Power Monitoring and Motor Control, Multi-Axis Vibration and Modal Analysis, Optical Networking and Spectral Monitoring, Automated Test Equipment (ATE) and Instrumentation.
Multichannel Industrial Data Acquisition
The LTC2344CUH-16's quad simultaneous-sampling channels at 400 ksps each and 93.4 dB SNR make it ideal for high-density industrial data-acquisition systems. The 102 dB CMRR allows direct digitization of differential signals riding on top of high common-mode voltages from sensor bridges and 4-20 mA loops without front-end instrumentation amplifiers. The 32-QFN (5x5) footprint fits in compact PLC analog input modules. SPI CMOS or LVDS interface selection lets designers trade bus width for cable length, with LVDS supporting backplane connections over 1 meter. Designers using such conversions can scale by stacking multiple devices on a shared SPI or LVDS bus.
推薦
Medical Patient Monitoring and ECG/EMG Front Ends
The LTC2344CUH-16's simultaneous sampling across four channels preserves the phase relationship between ECG leads I, II, III, and the reference electrode - critical for accurate cardiac vector analysis. At 93.4 dB SNR and ±1.25 LSB INL, the converter digitizes microvolt-level bioelectric signals with adequate resolution for diagnostic-grade monitoring. The wide ±10.24V SoftSpan input accommodates the high common-mode voltages typical of defibrillator-protected patient leads. The single 5V analog supply simplifies medical isolation barrier design, and the 1.8V-5V digital interface allows direct connection to low-power microcontrollers.
推薦
Three-Phase Power Monitoring and Motor Control
For three-phase current and voltage monitoring, the LTC2344CUH-16's four simultaneous-sampling channels match the four signals (three phases plus neutral) with phase coherence preserved at the converter level. The 400 ksps per channel rate supports harmonic analysis up to the 40th harmonic of a 50/60 Hz fundamental, well beyond standard power-quality meter requirements. The 102 dB CMRR rejects the high common-mode transients of switching-mode motor drives, and the 5V analog supply operates directly from rectified bus voltage rails with simple regulation.
推薦
Multi-Axis Vibration and Modal Analysis
Vibration modal analysis requires simultaneous sampling of multiple accelerometer channels to capture phase-coherent frequency-response functions. The LTC2344CUH-16's four channels at 400 ksps provide aggregate 1.6 Msps bandwidth, supporting vibration analysis up to 200 kHz per channel without aliasing. The 93.4 dB SNR ensures adequate dynamic range for high-fidelity modal testing, and the differential inputs accept IEPE-compatible accelerometer outputs directly. The 32-QFN (5x5) footprint enables compact multi-channel data acquisition modules.
推薦
Optical Networking and Spectral Monitoring
Optical spectral monitoring and DWDM channel-power measurement benefit from the LTC2344CUH-16's 93.4 dB SNR and 102 dB CMRR. Four simultaneous-sampling ADCs support parallel photodetector channels for multi-wavelength optical power monitoring in ROADM and optical add-drop multiplexer applications. The wide ±10.24V input spans accommodate the wide dynamic range typical of optical receivers, and the LVDS interface option enables long-distance backplane connection in large optical switch chassis.
推薦
Automated Test Equipment (ATE) and Instrumentation
Automated test equipment digitizes multi-channel DUT signals at high speed and resolution. The LTC2344CUH-16's 16-bit resolution at 400 ksps per channel with 93.4 dB SNR delivers measurement accuracy suitable for production-line testing of analog and mixed-signal ICs. The flexible SoftSpan input ranges simplify fixture design by eliminating the need for external range-switching networks. The pin-selectable SPI/LVDS interface allows fixture-side sharing and field-shareable LVDS backplane connection in larger ATE systems.
推薦
推薦產品摘要
工程參考資料，適用於 LTC2344CUH-16 — 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 | LTC2344CUH-16#TRPBF | LTC2344IUK-16 | LTC2344CUH-18 | LTC2341HUH-18 | LTC2335HLX-16 |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 32-QFN (5x5) | 32-QFN (5x5) - same | 32-QFN (5x5) - same | 32-QFN (5x5) - same | 32-QFN (5x5) - same | 32-QFN (5x5) - same |
| Resolution | 16 bits | 16 bits | 16 bits | 18 bits | 18 bits | 16 bits |
| Number of Channels | 4 | 4 | 4 | 4 | 1 | 8 |
| Sampling Rate (per channel) | 400 ksps | 400 ksps | 400 ksps | 400 ksps | 200 ksps | 500 ksps |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C (I grade) | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C |
主要差異化特點
- Quad simultaneous-sampling at 400 ksps per channel (對比LTC2341HUH-18)
- Resolution upgrade path within same footprint (對比LTC2344CUH-18)
- Pin-selectable SPI/LVDS interface (對比LTC2335HLX-16)
設計說明
The LTC2344CUH-16 requires a clean 5V analog supply on AVDD and a separate 1.8V-5V digital supply on OVDD. Estimated: at 400 ksps with all four channels active, the analog supply current is in the 10-20 mA range per the datasheet typical characteristics; use a low-noise LDO such as the LT3042 with adequate bulk decoupling. Place a 10 µF ceramic bypass capacitor close to each AVDD pin and a 0.1 µF decoupling capacitor directly at the supply pins to reduce ADC noise coupling from the digital switching circuits.
The 32-QFN package has an exposed thermal pad that MUST be soldered to a ground plane on the PCB for thermal dissipation and electrical performance. Per Analog Devices reference layouts, use a continuous ground plane under the device, route analog input traces as differential pairs with ground guard traces, and place the reference bypass capacitor as close as possible to the REF pin. The REFBUF pin requires a 10 µF X7R ceramic bypass capacitor to ground for reference stability.
Route analog inputs (IN1± to IN4±) as matched-length, matched-impedance differential pairs with no vias where possible. Isolate analog and digital sections with a ground moat or split plane, joining at a single point near the ADC. Keep digital interface traces (SDO, CNV, SCK) away from analog input traces to avoid digital switching noise coupling into the analog front end. Maintain 50-ohm controlled impedance on LVDS pairs if LVDS interface mode is selected.
Do not operate the LTC2344CUH-16 without the REF bypass capacitor - the internal reference buffer requires external bypass for stability. Avoid driving analog inputs beyond the selected SoftSpan span or exceeding the absolute maximum ratings (±15V on analog inputs); this can permanently damage the device. When using LVDS interface mode, verify 100-ohm differential termination at the receiver end to prevent signal integrity issues. The SoftSpan range must be written to the configuration register before each conversion - forgetting this causes incorrect output codes.
合規資訊
RoHS compliant per #PBF suffix designation on Analog Devices datasheet. Lead-free (Pb-free) reflow-compatible. Not AEC-Q100 qualified - this is an industrial/medical grade part, not automotive grade. Halogen-free status not explicitly confirmed in the provided data.
