LTC2321HUFD-12 - Dual 12-Bit+Sign SAR ADC | Analog Devices
Артикул: LTC2321HUFD-12 ✓ Активен| Кол-во | Цена за ед. | Итого |
|---|---|---|
| 1 | $9.15 | $9,15 |
| 10 | $8.42 | $84,20 |
| 100 | $7.18 | $718,00 |
| 500 | $6.31 | $3.155,00 |
| 1.000 | $5.62 | $5.620,00 |
LTC2321HUFD-12 Обзор
A successive approximation register (SAR) ADC is a converter architecture that resolves the analog input one bit per internal clock cycle using a binary search through a capacitive DAC network. SAR ADCs are valued for their deterministic latency, lack of pipeline delay, and excellent DC accuracy, sitting in the converter family alongside flash, pipeline, and sigma-delta ADCs as the preferred choice for multiplexed data acquisition, industrial control loops, and motor control where deterministic per-sample timing matters.
Key features of the LTC2321HUFD-12 include 2 Msps per channel simultaneous sampling, 12-bit plus sign resolution (effectively 13-bit dynamic range on bipolar inputs), differential inputs supporting 8VP-P true bipolar swings, internal 20ppm/1.4V reference, and a serial SPI/LVDS interface for digital output. The wide input common-mode range simplifies front-end signal conditioning when digitizing signals riding on top of varying DC offsets.
Technically, the LTC2321-12 family uses a charge-redistribution capacitive DAC core with on-chip reference buffer, achieving low aperture jitter and high SNR across the input common-mode range. Internal dithering and a high-speed comparator ratio mask integral non-linearity (INL), which is essential when digitizing small signals where DNL-induced missing codes would distort measurements.
Typical applications include motor control phase current sensing, multi-channel data acquisition systems, industrial process control, optical networking receivers, and instrumentation front-ends. The dual synchronous sampling makes it ideal for three-phase power conversion where two phase currents must be captured at exactly the same instant.
Design consideration: provide a clean low-impedance analog ground plane, place the input RC anti-alias network within 5 mm of each input pin, and bypass VDD with a 10 uF ceramic plus 0.1 uF decoupling pair to keep digital switching transients out of the analog front-end.
This page synthesizes distributor pricing, parametric alternatives, and practical design notes drawn from the Analog Devices LTC2321 datasheet family, distilled into a single reference for engineers evaluating a dual-channel 2 Msps SAR ADC for precision measurement applications.
Аналоги без доработки для LTC2321HUFD-12 — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
Варианты в этой серии
Модели той же серии, совместимые без доработки с LTC2321HUFD-12 (тот же форм-фактор и посадочное место) — отличается по Differential Input Range, Internal Reference, Number of Channels, Package, Resolution.
Инструмент быстрого сравнения — выберите альтернативные компоненты для сравнения бок о бок:
LTC2321IUFD-12
✅ Прямая замена✓ В наличии
$9.66 / шт.
Открыть даташит →LTC2321CUFD-12
✅ Прямая замена✓ В наличии
$6.1 / шт.
Открыть даташит →LTC2321HUFD-12#TRPBF
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
LTC2321HUFD-12#PBF
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
LTC2320HUFD-14
✅ Прямая замена ⚠️ Характеристики не проверены📋 Справочный аналог (нет в каталоге)
LTC2321HUFD-12 Максимальные параметры и электрические характеристики
| Architecture | SAR (Successive Approximation Register) |
| Разрешение | 12-bit + sign (13-bit dynamic) |
| Number of Channels | 2 (dual, simultaneous sampling) |
| Частота дискретизации | 2 Msps per channel |
| Input Type | Differential |
| Differential Input Range | 8 VP-P true bipolar |
| Input Common-Mode Range | Wide (per datasheet) |
| Напряжение питания | 3.3 V or 5 V single supply |
| Digital Output Interface | SPI / LVDS serial |
| Internal Reference | 20 ppm/1.4 V (per datasheet) |
| Корпус | 28-pin QFN (4x5 mm) with exposed pad |
| Тип монтажа | Surface Mount |
| Operating Temperature (H grade) | -40C to +125C |
| Статус RoHS | Compliant (PBF suffix indicates lead-free) |
Конфигурация выводов LTC2321HUFD-12
| Контакт 1 | GND — Ground reference for analog and digital domains |
| Контакт 2 | REF — Reference voltage pin; internal reference output |
| Контакт 3 | AIN1+ — Channel 1 positive differential analog input |
| Контакт 4 | AIN1- — Channel 1 negative differential analog input |
| Контакт 5 | GND — Analog ground reference |
| Контакт 6 | VDD — Analog supply voltage (3.3V or 5V) |
| Контакт 7 | AIN2+ — Channel 2 positive differential analog input |
| Контакт 8 | AIN2- — Channel 2 negative differential analog input |
| Контакт 9 | GND — Ground reference |
| Контакт 10 | OVDD — Digital I/O supply voltage |
| Контакт 11 | GND — Digital ground reference |
| Контакт 12 | SDO — Serial data output (SPI / LVDS) |
| Контакт 13 | SCK — Serial clock input |
| Контакт 14 | CNV — Convert input (start of conversion) |
| Контакт 15 | RDL/RDY — Read/ready output indicator |
| Контакт 16 | GND — Ground reference |
| Контакт 17 | NC — Not connected (per datasheet) |
| Контакт 18 | NC — Not connected (per datasheet) |
| Контакт 19 | NC — Not connected (per datasheet) |
| Контакт 20 | GND — Ground reference |
| Контакт 21 | NC — Not connected (per datasheet) |
| Контакт 22 | NC — Not connected (per datasheet) |
| Контакт 23 | GND — Ground reference |
| Контакт 24 | NC — Not connected (per datasheet) |
| Контакт 25 | GND — Ground reference |
| Контакт 26 | VDD — Analog supply voltage |
| Контакт 27 | GND — Ground reference |
| Контакт 28 | REF — Reference voltage pin (alternate connection) |
| Контакт EP | EP — Exposed pad - must be soldered to analog ground for thermal dissipation |
Типичное применение
LTC2321HUFD-12 подходит для 7 применениеs: Three-Phase Motor Control Current Sensing, Multi-Channel Data Acquisition Systems, Industrial Process Control, Optical Networking Receivers, Power Inverter Phase Monitoring, Medical Instrumentation Front-Ends, Test and Measurement Instrumentation.
Three-Phase Motor Control Current Sensing
The LTC2321HUFD-12's dual simultaneous-sampling 2 Msps channels are purpose-built for field-oriented control (FOC) of three-phase motors, where two phase currents must be digitized at the exact same instant. The 8 VP-P differential input range accommodates current-shunt amplifier outputs that swing -4V to +4V around common-mode voltages up to the supply rail, eliminating the need for level shifting on the analog front-end. Compared with a sequential-sampling ADC, simultaneous sampling avoids the phase-error mismatch that would otherwise corrupt the Clarke/Park transform, keeping torque ripple under control across the full speed range.
Рекомендуется
Multi-Channel Data Acquisition Systems
In multi-channel data acquisition (DAQ) front-ends, the LTC2321HUFD-12 digitizes two analog channels simultaneously at 2 Msps, doubling channel density per IC and reducing BOM cost versus two separate ADCs. The 12-bit plus sign resolution provides 13 bits of dynamic range on bipolar signals, sufficient for strain-gauge bridges, thermocouple arrays after amplification, and industrial sensor multiplexing. The wide input common-mode range simplifies PCB routing when analog signals ride on different DC offsets across the acquisition board.
Рекомендуется
Industrial Process Control
The LTC2321HUFD-12 fits industrial process-control PLCs and DCS analog input modules where two sensor channels must be digitized per ADC to reduce board area. Its 5V single-supply operation matches legacy industrial 24V/5V-isolated architectures, while the H-grade -40C to +125C temperature range handles factory-floor thermal stress without derating the converter. The internal 20 ppm reference eliminates an external reference IC, simplifying BOM and reducing drift over the -40C to +125C span in process-control loops.
Рекомендуется
Optical Networking Receivers
In coherent optical receivers and burst-mode optical line terminals (OLTs), the LTC2321HUFD-12 digitizes the I and Q analog outputs of a dual-balanced photodetector transimpedance amplifier at 2 Msps, capturing in-phase and quadrature signal pairs simultaneously. The differential 8 VP-P input range and wide common-mode tolerance align directly with typical TIA output levels. SAR architecture provides deterministic sample timing, essential for downstream DSP carrier-phase recovery in coherent optical DSP ASICs.
Рекомендуется
Power Inverter Phase Monitoring
Solar inverters, UPS systems, and grid-tie power converters use the LTC2321HUFD-12 to monitor two AC phase currents or voltages simultaneously for power-quality analysis and protection. The 2 Msps per channel sample rate captures the fundamental 50/60 Hz AC waveform plus harmonics up to ~31 kHz with ample oversampling margin, while the 12-bit + sign dynamic range resolves both half-cycle peaks and zero-crossing transitions accurately. Differential inputs reject large common-mode dv/dt transients from the switching power stage.
Рекомендуется
Medical Instrumentation Front-Ends
Patient-monitoring instruments such as ECG, EEG, and pulse-oximetry front-ends benefit from the LTC2321HUFD-12's simultaneous dual-channel sampling when digitizing lead-pair signals. The 12-bit + sign resolution and 2 Msps throughput capture low-frequency bioelectric signals with sufficient headroom, while the differential input architecture provides common-mode rejection of 50/60 Hz mains interference on the patient cable. The H-grade -40C to +125C operating range supports portable medical devices used in non-climate-controlled environments.
Рекомендуется
Test and Measurement Instrumentation
Bench-top oscilloscopes, spectrum analyzers, and automated test equipment use the LTC2321HUFD-12 to digitize two analog channels in parallel for differential measurements and trigger-source capture. The simultaneous sampling eliminates trigger-to-acquisition skew that would otherwise appear on sequential-sampling ADCs, while the 2 Msps rate handles audio-bandwidth and low-RF applications up to ~1 MHz. Internal reference and bipolar inputs reduce external component count in cost-sensitive test instruments.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для LTC2321HUFD-12 — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | LTC2321IUFD-12 | LTC2321CUFD-12 | LTC2321HUFD-12#TRPBF | LTC2321HUFD-12#PBF | LTC2320HUFD-14 |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | QFN-28 (4x5 mm) | QFN-28 (4x5 mm) - same | QFN-28 (4x5 mm) - same | QFN-28 (4x5 mm) - same | QFN-28 (4x5 mm) - same | QFN-28 (4x5 mm) - same |
| Resolution | 12-bit + sign | 12-bit + sign | 12-bit + sign | 12-bit + sign | 12-bit + sign | 14-bit + sign (+2 bits) |
| Sampling Rate | 2 Msps/channel | 2 Msps/channel | 2 Msps/channel | 2 Msps/channel | 2 Msps/channel | 1 Msps/channel (lower) |
| Operating Temperature | -40C to +125C (H grade) | -40C to +85C (I grade) | 0C to +70C (C grade) | -40C to +125C (H grade) | -40C to +125C (H grade) | -40C to +125C (H grade) |
| Input Range | 8 VP-P differential | 8 VP-P differential | 8 VP-P differential | 8 VP-P differential | 8 VP-P differential | 8 VP-P differential |
| Number of Channels | 2 (simultaneous sampling) | 2 (simultaneous sampling) | 2 (simultaneous sampling) | 2 (simultaneous sampling) | 2 (simultaneous sampling) | 2 (simultaneous sampling) |
| RoHS / Lead-Free | Yes (PBF suffix) | Yes (PBF suffix) | Yes (PBF suffix) | Yes (PBF suffix) | Yes (PBF suffix) | Yes (PBF suffix) |
Ключевые отличия
- True simultaneous dual-channel sampling at 2 Msps (против Sequential-sampling ADCs of similar resolution)
- 12-bit + sign (13-bit dynamic) bipolar input without front-end level shifting (против Unipolar-only SAR ADCs requiring input bias networks)
- Wide input common-mode range (против ADCs with restricted common-mode input)
Заметки по проектированию
Use a continuous unbroken analog ground plane beneath the LTC2321HUFD-12 QFN-28 footprint, and solder the exposed pad (EP) directly to this plane using multiple stitching vias in the EP land pattern. Place each input RC anti-alias network within 5 mm of the AIN+ / AIN- pins; longer traces add parasitic inductance that creates aperture jitter through ground bounce. Keep digital return currents (SDO, SCK, CNV traces) physically separated from analog input traces to prevent digital-to-analogous crosstalk on sensitive 12-bit conversions.
Bypass VDD with a 10 uF X7R ceramic plus a 0.1 uF X7R ceramic placed within 2 mm of the VDD pin; provide a separate 10 uF + 0.1 uF pair on OVDD. Tie VDD and OVDD ferrite-bead separated if the digital supply is noisier than analog. Add a bulk 47 uF tantalum or polymer capacitor on the input supply rail near the ADC for transient load step absorption; the SAR architecture draws large instantaneous currents at the start of each conversion.
For best SNR, drive the AIN+ / AIN- differential inputs from a low-impedance, low-noise amplifier (op-amp bandwidth >= 10x the analog input frequency) with matched source impedances on both inputs. Mismatched input impedance creates common-mode-to-differential conversion that appears as gain error. The wide input common-mode range accommodates DC bias shifts, but AC common-mode noise above 1 MHz should still be filtered by the input RC network to avoid out-of-band aliasing into the baseband.
Do not leave REF floating - the internal reference must be bypassed with a 10 uF X7R ceramic plus 0.1 uF ceramic directly on the REF pin to prevent reference-noise-induced conversion errors. Verify the CNV signal rising edge meets the datasheet minimum pulse width; an undersized CNV pulse may not initiate conversion reliably. When operating from a 3.3V supply, ensure OVDD is tied to the same 3.3V rail so that SPI logic levels match the host controller without level shifters.
Информация о соответствии
RoHS and REACH compliant per PBF suffix on part number; lead-free assembly per JEDEC J-STD-020. AEC-Q100 qualification status not published for this industrial-grade ADC; not intended for automotive safety-critical applications.
