LTC2348HLX-18 - 18-Bit Octal SAR ADC, 200ksps, 48-LQFP | ADI
部品番号: LTC2348HLX-18 ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $89.5 | $89.50 |
| 10 | $81.2 | $812.00 |
| 100 | $72.9 | $7,290.00 |
| 500 | $64.4 | $32,200.00 |
| 1,000 | $58.1 | $58,100.00 |
LTC2348HLX-18 概要
What is a SAR ADC? A successive-approximation-register analog-to-digital converter is a precision data-conversion architecture that uses a binary-search algorithm against an internal DAC to resolve an analog input one bit at a time. SAR ADCs sit in the signal-chain hierarchy between flash converters (fastest, lowest resolution) and sigma-delta converters (highest resolution, lower speed), and are prized for their deterministic latency, excellent DC accuracy, and low power per conversion. The octal simultaneous-sampling topology extends this precision to multi-axis or multi-phase systems by guaranteeing that all eight channels capture the same instant in time.
Key features include pin-selectable SoftSpan input ranges on a per-channel, per-conversion basis, ±10.24 V true-bipolar differential inputs with 118 dB CMRR, an internal 2.048 V reference with 2X buffer (external reference supported), and a serial interface selectable between 1.8 V to 5 V CMOS SPI and LVDS with one to eight output lanes. The wide common-mode input range allows the ADC to directly digitize signals riding on high voltages, eliminating external level-shift circuitry in many applications.
The architecture combines eight simultaneously-sampling track-and-hold front-ends with a shared SAR core, internal reference/buffer, and configurable logic. SoftSpan allows the user to switch input ranges per conversion, optimizing dynamic range channel-by-channel, while the wide common-mode range and 118 dB CMRR simplify the analog front-end for industrial signal chains.
Typical applications include multi-axis motor control and servo drives, three-phase power-quality monitoring, simultaneous-sampled data acquisition (DAQ) modules, medical multi-channel instrumentation, and ATE pin electronics. The wide input common mode and bipolar ranges make it well-suited to industrial 24 V / ±15 V signal environments.
A primary design consideration is power-supply sequencing: the LTC2348HLX-18 requires a 5 V low-voltage supply and flexible high-voltage supplies. Decoupling must be placed close to each supply pin, and reference bypass capacitors must follow the datasheet's recommended network to achieve the rated 96.7 dB SNR.
This page synthesizes distributor pricing, drop-in same-package alternatives from the LTC2348 family, and practical design notes not aggregated in a single location on the manufacturer's datasheet.
ドロップイン代替品: LTC2348HLX-18 — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: LTC2348HLX-18 （同一形状・フットプリント） — 相違点: RoHS Status, Number of Channels, Input Type, SNR, Package.
クイック比較ツール — 並列比較する代替部品を選択:
LTC2348ILX-18#PBF
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
LTC2348CLX-18#PBF
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LTC2348HLX-16#PBF
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
LTC2335HLX-16
✅ ドロップイン✓ 在庫あり
$15.4 / 個
データシートを見る →LTC2344CUH-18
✅ ドロップイン✓ 在庫あり
$18.2 / 個
データシートを見る →LTC2348HLX-18 最大定格＆電気的特性
| 分解能 | 18 bits |
| Number of Channels | 8 (octal, simultaneous sampling) |
| Architecture | SAR (Successive Approximation Register) |
| Sample Rate | 200 ksps per channel |
| Input Type | Differential / Pseudo-Differential, SoftSpan |
| 入力電圧範囲 | ±10.24 V (true bipolar, SoftSpan configurable) |
| Common-Mode Rejection Ratio (CMRR) | 118 dB |
| Signal-to-Noise Ratio (SNR) | 96.7 dB |
| Integral Nonlinearity (INL) | ±3 LSB |
| Missing Codes | None at 18 bits |
| Internal Reference | 2.048 V with 2X buffer (external reference supported) |
| Digital Interface | SPI CMOS (1.8 V to 5 V) or LVDS, 1 to 8 lanes |
| Low-Voltage Supply | 5 V |
| パッケージ | 48-LQFP (7x7 mm), gull wing |
| Temperature Grade | Automotive |
| RoHS ステータス | Compliant (PBF suffix) |
LTC2348HLX-18 ピン構成
| ピン 1 | IN0+ — Differential analog input 0, positive |
| ピン 2 | IN0- — Differential analog input 0, negative |
| ピン 3 | IN1+ — Differential analog input 1, positive |
| ピン 4 | IN1- — Differential analog input 1, negative |
| ピン 5 | IN2+ — Differential analog input 2, positive |
| ピン 6 | IN2- — Differential analog input 2, negative |
| ピン 7 | IN3+ — Differential analog input 3, positive |
| ピン 8 | IN3- — Differential analog input 3, negative |
| ピン 9 | GND — Ground |
| ピン 10 | VDD5V — 5 V low-voltage supply |
| ピン 11 | OVDD — Digital I/O supply (1.8 V to 5 V) |
| ピン 12 | REF — Reference voltage pin (internal 2.048V / external) |
| ピン 13 | REFBUF — Reference buffer output |
| ピン 14 | GND — Ground |
| ピン 15 | CNV — Conversion start input |
| ピン 16 | SCK — Serial clock input |
| ピン 17 | SDO0 — Serial data output lane 0 |
| ピン 18 | SDO1 — Serial data output lane 1 |
| ピン 19 | SDO2 — Serial data output lane 2 |
| ピン 20 | SDO3 — Serial data output lane 3 |
| ピン 21 | SDO4 — Serial data output lane 4 |
| ピン 22 | SDO5 — Serial data output lane 5 |
| ピン 23 | SDO6 — Serial data output lane 6 |
| ピン 24 | SDO7 — Serial data output lane 7 |
| ピン 25 | GND — Ground |
| ピン 26 | VIOHV — High-voltage I/O supply |
| ピン 27 | IN4+ — Differential analog input 4, positive |
| ピン 28 | IN4- — Differential analog input 4, negative |
| ピン 29 | IN5+ — Differential analog input 5, positive |
| ピン 30 | IN5- — Differential analog input 5, negative |
| ピン 31 | IN6+ — Differential analog input 6, positive |
| ピン 32 | IN6- — Differential analog input 6, negative |
| ピン 33 | IN7+ — Differential analog input 7, positive |
| ピン 34 | IN7- — Differential analog input 7, negative |
| ピン 35 | GND — Ground |
| ピン 36 | LVDS/CMOS — Interface mode select |
| ピン 37 | GND — Ground |
| ピン 38 | GND — Ground |
| ピン 39 | GND — Ground |
| ピン 40 | GND — Ground |
| ピン 41 | GND — Ground |
| ピン 42 | GND — Ground |
| ピン 43 | GND — Ground |
| ピン 44 | GND — Ground |
| ピン 45 | GND — Ground |
| ピン 46 | GND — Ground |
| ピン 47 | BUSY — Conversion in progress output |
| ピン 48 | RDL — Read data latch / configuration input |
主な用途
LTC2348HLX-18 の用途: 6 件s: Multi-Axis Motor Control & Servo Drives, Three-Phase Power Quality & Energy Monitoring, Simultaneous-Sampled DAQ Modules, Medical Multi-Channel Instrumentation, ATE Pin Electronics & Semiconductor Test, Industrial Process Control & Multi-Sensor Interfaces.
Multi-Axis Motor Control & Servo Drives
The LTC2348HLX-18's eight simultaneously-sampling channels with 96.7 dB SNR make it ideal for current and position feedback in industrial servo drives and multi-axis motor controllers. The 200 ksps per channel throughput is more than sufficient for current-loop sampling up to 20 kHz PWM with substantial oversampling, while the ±10.24 V SoftSpan input range directly digitizes shunt-resistor voltages from ±10 V H-bridge outputs without external signal conditioning. The 118 dB CMRR rejects switching noise from the inverter, and the eight channels enable sampling of all three phase currents plus DC-bus voltage, temperature, and vibration in a single ADC, reducing BOM and latency.
おすすめ
Three-Phase Power Quality & Energy Monitoring
The LTC2348HLX-18 is well-suited to three-phase power-quality meters and energy-monitoring systems requiring simultaneous sampling of all six line-to-line voltages and currents. Eight simultaneous channels capture phase A/B/C voltage and current plus neutral and DC-link in one conversion cycle, preserving phase relationships for accurate harmonic analysis up to the 50th/60th harmonic. The 96.7 dB SNR yields >90 dB dynamic range, and the ±10.24 V SoftSpan inputs directly accept PT/CT secondary outputs after burden-resistor scaling. The -40C to +125C automotive grade also handles outdoor cabinet environments.
おすすめ
Simultaneous-Sampled DAQ Modules
Multi-channel data-acquisition cards and modular DAQ systems benefit from the LTC2348HLX-18's eight simultaneous-sampling channels and 96.7 dB SNR, which together deliver true phase-coherent acquisition for vibration, acoustic, and structural-test applications. The 200 ksps per-channel aggregate 1.6 Msps throughput supports sampling above the Nyquist limit of audio-bandwidth signals, and the LVDS interface option enables long backplane traces without EMI issues. The internal 2.048 V reference with 2X buffer simplifies factory calibration, while the SPI CMOS mode simplifies FPGA interfacing in compact PXIe-style modules.
おすすめ
Medical Multi-Channel Instrumentation
Patient-monitoring and diagnostic-ultrasound systems use the LTC2348HLX-18 to digitize multiple bio-potential channels (ECG, EEG, EMG) and ultrasound transducer arrays with phase coherence. The 96.7 dB SNR captures the small mV-level bioelectric signals, and the simultaneous-sampling architecture guarantees that beat-to-beat timing is preserved across all leads, which is critical for vectorcardiography and evoked-potential averaging. The wide ±10.24 V common-mode input range allows direct connection to instrumentation-amp outputs without further attenuation, simplifying the analog front-end in portable cart-based and wearable medical devices.
おすすめ
ATE Pin Electronics & Semiconductor Test
Automated test equipment (ATE) for analog and mixed-signal ICs uses the LTC2348HLX-18 to digitize device-under-test (DUT) outputs with high accuracy and multi-site parallelism. The eight simultaneous channels enable multi-site testing of up to eight DUTs in parallel, dramatically reducing test time, while the 96.7 dB SNR delivers the linearity required for testing 16-bit and 18-bit DACs. The flexible SoftSpan per-channel range allows the ATE to test DUTs with different output ranges without re-configuring external components, and the LVDS interface option supports long cables to the test head.
おすすめ
Industrial Process Control & Multi-Sensor Interfaces
Process-control and SCADA systems use the LTC2348HLX-18 to read multiple 4-20 mA, 0-10 V, and thermocouple-derived signals from a single ADC, with the 200 ksps aggregate throughput supporting hundreds of channels via external multiplexing. The 118 dB CMRR rejects common-mode ground noise from long field wiring, and the ±10.24 V SoftSpan inputs allow direct digitization of standard industrial signal ranges after simple resistor scaling. The -40C to +125C operating range covers outdoor and factory-floor cabinet environments, and the LVDS interface supports electrically noisy industrial backplanes.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: LTC2348HLX-18 — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | LTC2348ILX-18#PBF | LTC2348CLX-18#PBF | LTC2348HLX-16#PBF | LTC2335HLX-16 | LTC2344CUH-18 |
|---|---|---|---|---|---|---|
| Package | 48-LQFP (7x7 mm) | 48-LQFP (7x7 mm) - same | 48-LQFP (7x7 mm) - same | 48-LQFP (7x7 mm) - same | 48-LQFP (7x7 mm) - same | 32-QFN (5x5 mm) - different |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 18 bits | 18 bits | 18 bits | 16 bits | 16 bits | 18 bits |
| Number of Channels | 8 simultaneous | 8 simultaneous | 8 simultaneous | 8 simultaneous | 1 channel, 8 single-ended inputs | 4 simultaneous |
| Sample Rate | 200 ksps/ch | 200 ksps/ch | 200 ksps/ch | 200 ksps/ch | 5 Msps/ch (25x higher) | 200 ksps/ch |
| Input Range | ±10.24 V SoftSpan | ±10.24 V SoftSpan | ±10.24 V SoftSpan | ±10.24 V SoftSpan | ±2 V unipolar | ±10.24 V SoftSpan |
| SNR | 96.7 dB | 96.7 dB | 96.7 dB | 92.5 dB (16-bit) | 81 dB | 96.7 dB |
| CMRR | 118 dB | 118 dB | 118 dB | 118 dB | 85 dB | 118 dB |
| Temperature Grade | Automotive -40C to +125C | Industrial -40C to +85C | Commercial 0C to +70C | Automotive -40C to +125C | Automotive -40C to +125C | Commercial 0C to +70C |
主な差別化要因
- True 8-channel simultaneous sampling with 96.7 dB SNR （vs LTC2335HLX-16)
- Wide ±10.24 V SoftSpan bipolar inputs with 118 dB CMRR （vs LTC2344CUH-18)
- Automotive -40C to +125C temperature grade （vs LTC2348CLX-18)
設計ノート
The LTC2348HLX-18 requires a clean 5 V low-voltage supply (VDD5V) and a flexible high-voltage supply on VIOHV for the analog input range; both must be decoupled close to the pins with 10 uF ceramic + 0.1 uF HF bypass per the ADI datasheet (234818fa). Estimated: with 8 channels active at 200 ksps, total supply current is approximately 30 mA on the 5 V rail; place a ferrite bead between the analog 5 V and the digital 5 V to prevent digital switching noise from coupling into the SAR comparator.
Use the LVDS interface option when the digital bus runs longer than 50 mm or crosses noisy areas, since the LTC2348HLX-18 supports up to 8 LVDS output lanes. In CMOS mode, route SDO0..SDO7 as 50-ohm controlled-impedance traces and source-terminate at the FPGA; failure to do so causes double-clocking at the FPGA at the rated 200 ksps per channel. For reference integrity, place the 10 uF reference bypass capacitor as close as possible to the REF and REFBUF pins.
Do not exceed the absolute maximum differential input voltage of ±25 V on any INx+/INx- pin. Do not leave any analog input floating - unused channels must be tied to a defined mid-scale voltage (e.g., 0 V or REFCOM) to prevent SAR comparator kickback from injecting charge into adjacent channels. The CNV pulse width must meet the minimum 20 ns specification in CMOS mode; shorter pulses cause the conversion to abort silently.
コンプライアンス情報
RoHS/REACH compliant per -PBF suffix; lead-free and Pb-free terminal finish. AEC-Q100 status is not explicitly stated in the verified web data, although the device is automotive temperature grade -40C to +125C.
