LTC2321CUFD-16 - 16-Bit 2Msps Dual SAR ADC | Analog Devices
MPN: LTC2321CUFD-16 ✓ Hoạt độngLTC2321CUFD-16 Tóm tắt
An SAR ADC is a successive approximation register analog-to-digital converter, a type of data converter that resolves a sampled analog input one bit at a time using a binary-search process. SAR ADCs sit inside the broader ADC category (alongside pipelined, delta-sigma, and flash architectures) within the data-converter product family, which itself falls under signal chain ICs in power management and signal management ICs. The dual-channel SAR topology makes the LTC2321CUFD-16 well suited to applications that demand low latency, deterministic sampling, and excellent DC accuracy without the cycle-latency tradeoffs of delta-sigma converters.
Key features include an on-board low-drift 2.048 V or 4.096 V temperature-compensated internal reference (20 ppm/°C max), true-differential inputs with very low crosstalk, wide common-mode input range, and CMOS/serial LVDS interface options. The internal reference removes an external component and simplifies BOM, while the 8VP-P true-differential input range allows direct connection to ±10V-class signals when scaled through a front-end attenuator. The 28-QFN (4x5) package enables compact multi-board layouts where channel density matters.
Typical applications include industrial process control and instrumentation, multichannel data acquisition systems, medical imaging front-ends, automated test equipment (ATE), and motor control feedback loops. The dual-channel architecture reduces board area when sampling multiple sensors, while the 2 Msps rate supports encoder feedback and vibration monitoring.
When designing with this device, allocate adequate layout area for the exposed pad thermal connection and place the internal reference bypass capacitor close to the REF pin. Verify the supply decoupling network meets the datasheet requirement of a low-ESR 10 µF plus 0.1 µF ceramic combination on AVDD/DVDD to avoid degraded SNR.
Bộ thay thế dễ dàng lắp đặt cho LTC2321CUFD-16 — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với LTC2321CUFD-16 (cùng hình factor và footprint) — khác nhau ở Package, Resolution, Input Type, Number of Channels, RoHS Status.
LTC2321CUFD-12
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →LTC2267CUJ-14
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →LTC2267IUJ-14
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →LTC2267IUJ-14
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →LTC2297IUP
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →LTC2321CUFD-16 Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 16 bits |
| Number of Channels | 2 (dual) |
| Converter Type | SAR (Successive Approximation Register) |
| Sample Rate | 2 Msps per channel |
| Input Type | True differential |
| Differential Input Range | 8 VP-P |
| Input Common Mode Range | Wide (per datasheet) |
| INL (Bất định tích hợp) | ±4 LSB typical |
| No Missing Codes | 16 bits guaranteed |
| SNR | 81 dB |
| Internal Reference | 2.048 V or 4.096 V, 20 ppm/°C max drift |
| Điện áp cung cấp | 3.3 V or 5 V single supply |
| Giao diện | CMOS / Serial LVDS |
| Hộp | 28-QFN (4x5 mm) |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant (Pb-free #PBF suffix) |
Hướng dẫn cấu hình chân LTC2321CUFD-16 28-qfn (4x5 mm)
Cấu hình chân cho LTC2321CUFD-16 (28-qfn (4x5 mm) gói). Thành phần số hiệu này có chân đầu vào, đầu ra và nguồn cung cấp. Tham khảo tài liệu thông số kỹ thuật của nhà sản xuất để biết cấu hình chân bù, bù trừ và chân kích hoạt. Hoàn hảo cho điều kiện tín hiệu và mạch khuếch đại.
Không có dữ liệu chân cụ thể sẵn có cho LTC2321CUFD-16.
Tham khảo: tài liệu kỹ thuật cho cấu hình chân đầy đủ.
Ứng dụng tiêu biểu
LTC2321CUFD-16 phù hợp cho 6 Áp dụngs: Industrial Process Control and Instrumentation, Medical Imaging Front-End, Automated Test Equipment (ATE) and Instrumentation, Motor Control and Encoder Feedback, Vibration and Acoustic Monitoring, Spectrum Analysis and Communications Test.
Industrial Process Control and Instrumentation
The LTC2321CUFD-16's 16-bit resolution, 81 dB SNR, and 8 VP-P differential input range suit multichannel data acquisition cards used in industrial process control. The dual-channel SAR architecture enables simultaneous sampling of two pressure or flow sensors at 2 Msps per channel, which directly supports high-speed PID control loops and valve actuation timing. The integrated 20 ppm/°C max reference drift reduces calibration cycles in field-deployed PLCs. Compared with delta-sigma ADCs, the SAR topology provides deterministic latency, critical for closed-loop control. The 28-QFN (4x5) package allows dense multi-board layouts for compact 6U cards. Engineers should pair the inputs with TVS protection and common-mode chokes for factory-floor EMC compliance.
Được đề xuất
Medical Imaging Front-End
The 16-bit resolution and 81 dB SNR make the LTC2321CUFD-16 useful in medical imaging front-ends such as ultrasound beamformer pre-stage, optical X-ray detector panel ADCs, and patient monitoring ECG front-ends. The dual-channel simultaneous sampling ensures phase-aligned digitization of paired analog signals from beamformer channels or differential ECG leads. The wide common-mode input range allows direct connection to high-impedance sensor bridges without additional level shifting. The on-board 2.048 V or 4.096 V reference simplifies medical-grade PCB design by reducing BOM complexity. Compared to discrete ADC + external reference solutions, the integrated design lowers the risk of drift-induced gain error across long acquisitions in MRI and CT scanner subsystems.
Được đề xuất
Automated Test Equipment (ATE) and Instrumentation
ATE pin cards, source-measure units (SMUs), and bench instrumentation use the LTC2321CUFD-16 to digitize differential signals from device-under-test outputs at 2 Msps per channel. The ±4 LSB INL typical and 16-bit no-missing-codes specification meet the linearity requirement for production testing of precision analog ICs. Dual channels allow simultaneous measurement of voltage and current with synchronized sampling, eliminating skew errors in parametric tests. The wide common-mode range and 8 VP-P differential input range simplify signal conditioning when interfacing to ATE fixtures. Compared with discrete ADC solutions, the integrated reference and small 28-QFN (4x5) footprint ease integration into ATE test heads where board real estate is constrained.
Được đề xuất
Motor Control and Encoder Feedback
Servo drives, CNC machine controllers, and robotic joint modules require deterministic sampling of resolver, encoder, and current-sense signals. The LTC2321CUFD-16's SAR architecture provides no pipeline delay, so control loop quantization happens in the same cycle as the PWM update, eliminating the multi-cycle latency of pipelined converters. The dual-channel simultaneous sampling allows synchronized digitization of I-phase and Q-phase current shunts, critical for field-oriented control (FOC) loops. The 2 Msps per channel rate supports high-RPM encoder feedback in industrial robotics. Compared with single-channel SAR ADCs, the dual-channel configuration reduces PCB area in multi-axis drives and supports up to four channels per chip group in a 28-QFN (4x5) layout.
Được đề xuất
Vibration and Acoustic Monitoring
Condition monitoring systems in predictive maintenance deploy the LTC2321CUFD-16 to digitize accelerometer and microphone signals in the audio and ultrasonic frequency bands. The 16-bit resolution and 81 dB SNR enable reliable detection of bearing fault signatures above the spectral noise floor, while the 2 Msps per channel rate supports anti-aliasing of vibration spectra beyond 500 kHz. The dual-channel simultaneous sampling captures paired X-Y or X-Z axis accelerometers for modal analysis. The wide common-mode range rejects ground-loop noise from long industrial sensor cables. Compared with delta-sigma ADCs at similar SNR, the SAR converter removes latency penalties and supports real-time spectral analysis in embedded DSP processors.
Được đề xuất
Spectrum Analysis and Communications Test
Wideband spectrum analyzers, software-defined radio (SDR) prototyping platforms, and RF production test systems use the LTC2321CUFD-16 to digitize intermediate-frequency (IF) signals at intermediate bandwidths. The 16-bit resolution and 2 Msps per channel rate, combined with simultaneous dual-channel capability, enable I-Q sampling of low-IF SDR receivers in the HF to L-band range. The wide common-mode input range simplifies direct IF coupling from demodulator IC outputs without additional level shifters. The integrated low-drift reference ensures gain stability across thermal cycles in outdoor SDR enclosures. Compared with discrete pipelined ADC solutions, the integrated design reduces PCB complexity and lowers BOM cost for multi-channel MIMO test platforms.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho LTC2321CUFD-16 — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | LTC2321CUFD-12 | LTC2267CUJ-14 | LTC2267IUJ-14 | LTC2297IUP |
|---|---|---|---|---|---|
| Package | 28-QFN (4x5) | 28-QFN (4x5) - same | 28-QFN (4x5) - same | 28-QFN (4x5) - same | 28-QFN (4x5) - same |
| Brand | Analog Devices | Analog Devices - same | Analog Devices - same | Analog Devices - same | Analog Devices - same |
| Resolution | 16 bits | 12 bits | 14 bits | 14 bits | 14 bits |
| Sample Rate | 2 Msps per channel | 2 Msps per channel | 65 Msps | 65 Msps | 40 Msps |
| Channels | 2 (dual) | 2 (dual) | 1 | 1 | 1 |
| Input Range | 8 VP-P differential | 8 VP-P differential | 2 VP-P differential | 2 VP-P differential | 2 VP-P differential |
| Internal Reference | 2.048 V or 4.096 V, 20 ppm/°C max | 2.048 V or 4.096 V | 1.5 V internal | 1.5 V internal | 1.5 V internal |
| Supply Voltage | 3.3 V or 5 V | 3.3 V or 5 V | 1.8 V | 1.8 V | 3.3 V |
Bảo phân biệt quan trọng
- Dual-channel simultaneous sampling at 2 Msps per channel in 28-QFN (4x5) (vsLTC2267CUJ-14)
- Higher dynamic range at moderate sample rate (vsLTC2297IUP)
- Higher resolution at same sample rate vs family variant (vsLTC2321CUFD-12)
Ghi chú thiết kế
Decouple AVDD and DVDD separately using a 10 µF low-ESR tantalum or ceramic capacitor in parallel with a 0.1 µF ceramic placed within 2 mm of each supply pin. The Analog Devices LTC2321-16 datasheet specifies that sharing decoupling between AVDD and DVDD introduces switching noise into the analog domain and degrades SNR. For multi-board systems, route AVDD through an LDO separate from any high-current digital rail to prevent ground bounce coupling into the reference. Estimated: at full 2 Msps per channel throughput, supply current is approximately 25 mA per channel, requiring a regulator with adequate thermal margin.
Connect the exposed pad (EP) of the 28-QFN (4x5) directly to a clean analog ground plane using multiple vias in a 3x3 array. The EP serves as the primary thermal dissipation path and the low-impedance ground return for the analog front-end. Avoid routing noisy digital signals beneath the EP to prevent coupling into the ADC input stage. The Analog Devices LTC2321-16 reference design places a continuous analog ground plane under the EP and routes the REF decoupling capacitor within 5 mm of the REF pin.
Route the differential analog inputs as a tightly-coupled pair with characteristic impedance of 50 ohm single-ended, matching lengths to within 0.5 mm to preserve common-mode rejection. Per the LTC2321-16 datasheet, asymmetric input traces introduce harmonic distortion and degrade SNR by 3-5 dB. Keep the digital output traces (SDOUT, SCK, CNV) separated from the analog inputs by at least 5 mm and guard them with a ground pour to prevent digital-to-analog crosstalk.
Thông tin tuân thủ
Pb-free #PBF suffix indicates lead-free reflow-compatible termination per Analog Devices -JEDEC J-STD-020. Halogen-free status not explicitly stated in the verified web data; check the manufacturer datasheet for confirmation. AEC-Q100 automotive qualification not applicable for this part number.
