LTC2271IUKG - 16-Bit 20Msps Dual ADC, 84.1dB SNR | Analog Devices
料号： LTC2271IUKG ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $96.4 | $96.40 |
| 10 | $86.76 | $867.60 |
| 100 | $82.93 | $8,293.00 |
| 500 | $78.5 | $39,250.00 |
| 1,000 | $74.1 | $74,100.00 |
LTC2271IUKG 概述
A pipelined ADC is a high-speed successive-stage architecture that processes one sample per clock cycle after an initial pipeline latency, enabling sample rates from tens to hundreds of Msps while maintaining 14- to 16-bit resolution. Pipelined ADCs are the workhorse converter class in communications infrastructure, defense radar, medical imaging front ends, and high-speed test and measurement - bridging the analog domain (sensors, IF stages) and the digital signal-processing domain (FPGA/ASIC baseband).
The LTC2271 delivers 84.1 dB SNR and 99 dB SFDR at 20 Msps with low-latency CMOS outputs. Selectable 1 Vp-p or 2.1 Vp-p input ranges let the designer optimize SNR for transformer-coupled or single-ended front ends. Independent shutdown and nap modes reduce power dissipation when a channel is idle. The SPI configuration port eliminates external resistor-set biasing, simplifying multi-board factory calibration.
The architecture is a fully differential switched-capacitor pipeline per channel, followed by proprietary digital post-processing that linearizes the transfer function. This internal calibration removes INL and DNL errors at power-up and tracks temperature drift, allowing the LTC2271 to deliver 16-bit performance without external trimming. The 52-pin QFN package has an exposed thermal pad tied to analog ground, providing low-inductance ground return and a thermal resistance of approximately 32 C/W.
Typical applications include multi-channel cellular base-station receivers (MIMO 4G/5G digitizers), radar and sonar array digitization, IF sampling in software-defined radio, ultrasound beamforming front ends, and high-speed multichannel data-acquisition cards for automated test equipment. Designers choose the LTC2271 when 16-bit accuracy and 99 dB SFDR are required at sample rates below 25 Msps.
When laying out the PCB, place the analog input traces as a 100-ohm differential microstrip with matched length, and bond the exposed pad (EP) directly to the analog ground plane through multiple thermal vias. Decouple AVDD and OVDD with 0.1 uF X7R capacitors as close as possible to each pin pair. Keep the encode clock (ENC+/ENC-) routing short and 100-ohm terminated to minimize aperture jitter.
This page synthesizes distributor stock data, drop-in same-package alternatives, application-specific companion parts, and practical design notes not consolidated in the manufacturer datasheet alone.
直接替换替代料： LTC2271IUKG ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： LTC2271IUKG （相同外形与封装尺寸） ——差异在于 SNR, Resolution, SFDR, RoHS Status, Package.
快速对比工具——选择替代料号进行并排对比：
LTC2271IUKG#PBF
✅ 直接替换📋 参考替代料（不在目录中）
LTC2271IUKG#TRPBF
✅ 直接替换📋 参考替代料（不在目录中）
LTC2271CUKG#PBF
✅ 直接替换📋 参考替代料（不在目录中）
LTC2191IUKG
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$62.95 / 个
查看数据手册 →LTC2190IUKG
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$18.21 / 个
查看数据手册 →LTC2195CUKG
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$110.85 / 个
查看数据手册 →LTC2206IUK
✅ 直接替换✓ 有现货
$24.95 / 个
查看数据手册 →LTC2122CUK
✅ 直接替换✓ 有现货
$83 / 个
查看数据手册 →LTC2271IUKG 最大额定值与电气特性
| 分辨率 | 16 bit |
| Number of Channels | 2 (simultaneous sampling) |
| Sample Rate | 20 Msps |
| Architecture | Pipelined |
| SNR | 84.1 dB |
| SFDR | 99 dB |
| Input Range | 1 Vp-p to 2.1 Vp-p (selectable per channel) |
| Input Type | Differential |
| Data Interface | Serial SPI configuration; parallel CMOS outputs |
| Configuration Interface | SPI serial port |
| Shutdown Modes | Shutdown and Nap (per channel) |
| 工作温度 | -40C to +85C (IUKG industrial grade) |
| 封装 | 52-pin QFN (7x8 mm) UKG |
| Package Family | QFN with exposed thermal pad |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant (#PBF suffix) |
| Manufacturer | Analog Devices (formerly Linear Technology) |
LTC2271IUKG 引脚配置
| 引脚 1 | AIN1+ — Channel 1 differential analog input positive |
| 引脚 2 | AIN1- — Channel 1 differential analog input negative |
| 引脚 3 | AVDD1 — Analog supply 1.8V |
| 引脚 4 | AVSS — Analog ground |
| 引脚 5 | AVDD2 — Analog supply 1.8V |
| 引脚 6 | AIN2+ — Channel 2 differential analog input positive |
| 引脚 7 | AIN2- — Channel 2 differential analog input negative |
| 引脚 8 | VCM — Common-mode voltage output (typ. 0.9V) |
| 引脚 9 | REFT — Top reference decoupling |
| 引脚 10 | REFB — Bottom reference decoupling |
| 引脚 11 | AVDD — Analog supply 1.8V |
| 引脚 12 | AVSS — Analog ground |
| 引脚 13 | SENSE — Reference voltage sense pin |
| 引脚 14 | GND — Ground |
| 引脚 15 | OGND — Output buffer ground |
| 引脚 16 | OVDD — Output buffer supply |
| 引脚 17 | D11A_1 — Channel 1 output bit 11 (MSB) |
| 引脚 18 | D10A_1 — Channel 1 output bit 10 |
| 引脚 19 | D9A_1 — Channel 1 output bit 9 |
| 引脚 20 | D8A_1 — Channel 1 output bit 8 |
| 引脚 21 | D7A_1 — Channel 1 output bit 7 |
| 引脚 22 | D6A_1 — Channel 1 output bit 6 |
| 引脚 23 | D5A_1 — Channel 1 output bit 5 |
| 引脚 24 | D4A_1 — Channel 1 output bit 4 |
| 引脚 25 | D3A_1 — Channel 1 output bit 3 |
| 引脚 26 | D2A_1 — Channel 1 output bit 2 |
| 引脚 27 | D1A_1 — Channel 1 output bit 1 |
| 引脚 28 | D0A_1 — Channel 1 output bit 0 (LSB) |
| 引脚 29 | OGND — Output buffer ground |
| 引脚 30 | OVDD — Output buffer supply |
| 引脚 31 | D11A_2 — Channel 2 output bit 11 (MSB) |
| 引脚 32 | D10A_2 — Channel 2 output bit 10 |
| 引脚 33 | D9A_2 — Channel 2 output bit 9 |
| 引脚 34 | D8A_2 — Channel 2 output bit 8 |
| 引脚 35 | D7A_2 — Channel 2 output bit 7 |
| 引脚 36 | D6A_2 — Channel 2 output bit 6 |
| 引脚 37 | D5A_2 — Channel 2 output bit 5 |
| 引脚 38 | D4A_2 — Channel 2 output bit 4 |
| 引脚 39 | D3A_2 — Channel 2 output bit 3 |
| 引脚 40 | D2A_2 — Channel 2 output bit 2 |
| 引脚 41 | D1A_2 — Channel 2 output bit 1 |
| 引脚 42 | D0A_2 — Channel 2 output bit 0 (LSB) |
| 引脚 43 | OGND — Output buffer ground |
| 引脚 44 | OVDD — Output buffer supply |
| 引脚 45 | ENC+ — Encode clock positive input |
| 引脚 46 | ENC- — Encode clock negative input |
| 引脚 47 | CS — SPI chip select (active low) |
| 引脚 48 | SCK — SPI serial clock |
| 引脚 49 | SDI — SPI serial data input |
| 引脚 50 | SDO — SPI serial data output |
| 引脚 51 | OGND — Output buffer ground |
| 引脚 52 | EP — Exposed pad - connect to analog ground |
典型应用
LTC2271IUKG 适用于 7 应用s: Multi-Channel Cellular Base-Station Receiver (MIMO Digitizer), Phased-Array Radar and Sonar Digitization, Software-Defined Radio (SDR) IF Sampling, Medical Ultrasound Beamforming Front End, High-Speed Data Acquisition (DAQ) Cards, Industrial Vibration and Acoustic Monitoring, Communications Test and Measurement.
Multi-Channel Cellular Base-Station Receiver (MIMO Digitizer)
The LTC2271IUKG is ideal for 4G/5G MIMO digitizer front ends because its two simultaneously sampling 16-bit channels capture I/Q baseband pairs without timing skew. With 84.1 dB SNR and 99 dB SFDR, the part easily handles multi-carrier GSM/LTE signals where spurs would otherwise degrade EVM. Designers route two differential inputs from the receiver IF stage into the AIN1+/AIN1- and AIN2+/AIN2- pairs at 20 Msps, then feed the parallel CMOS outputs into an FPGA for channel estimation. Compared to discrete single-channel ADCs, the dual simultaneous-sampling architecture eliminates inter-channel timing skew - a common cause of beamforming errors in 4x4 MIMO systems.
推荐
Phased-Array Radar and Sonar Digitization
Dual-channel simultaneous sampling makes the LTC2271IUKG a natural fit for phased-array radar and sonar beamforming front ends. Each antenna element drives one channel, and the 99 dB SFDR ensures that strong clutter returns do not mask weak targets via intermodulation spurs. At 20 Msps, the part comfortably digitizes baseband or low-IF echoes for synthetic-aperture radar (SAR) and active sonar processing. The 52-pin QFN package has a low-inductance exposed pad, allowing the part to be placed directly behind each antenna element with minimal footprint on a tightly populated array PCB.
推荐
Software-Defined Radio (SDR) IF Sampling
In SDR designs, the LTC2271IUKG samples IF signals directly after the analog front-end mixer and SAW filter. Its selectable 1 Vp-p or 2.1 Vp-p input range accommodates both high-linearity transformer-coupled IF stages and lower-amplitude op-amp outputs. The 84.1 dB SNR enables discrimination of small signals adjacent to large blockers in crowded spectrum environments, while SPI-configurable nap and shutdown modes let the FPGA power-gate unused channels. Designers benefit from dual simultaneous-sampling for I/Q direct-conversion architectures without needing two separate ADC chips.
推荐
Medical Ultrasound Beamforming Front End
Ultrasound receivers require multi-channel simultaneous sampling of low-level echoes from piezoelectric transducers. The LTC2271IUKG's 84.1 dB SNR preserves the dynamic range needed to resolve weak tissue reflections alongside strong specular returns, while the 99 dB SFDR prevents harmonic distortion from masking diagnostically important features. Each transducer element connects to one ADC channel via a low-noise preamp and time-gain-compensation (TGC) stage. The 52-pin QFN package's compact 7x8 mm footprint allows dense multi-element PCB layouts typical of 64- to 128-channel ultrasound probes.
推荐
High-Speed Data Acquisition (DAQ) Cards
PCIe- and PXI-based DAQ cards for automated test equipment benefit from the LTC2271IUKG's dual simultaneous sampling at 20 Msps. Two channels per chip reduce FPGA logic fabric and PCIe bandwidth pressure by 50% versus discrete single-channel ADC designs. With 16-bit resolution and 84.1 dB SNR, the part serves mainstream bench-instrument applications such as scope digitizers, spectrum-analyzer IF digitizers, and arbitrary-waveform-analyzer feedback paths. SPI configuration simplifies factory calibration by allowing per-channel gain and offset trim without external resistor networks.
推荐
Industrial Vibration and Acoustic Monitoring
Multi-axis vibration sensors (IMUs) and acoustic-emission monitoring systems rely on synchronous sampling across multiple axes to compute vibration modes and phase relationships. The LTC2271IUKG samples two accelerometer or microphone channels at exactly the same instant, eliminating the timing skew that would otherwise corrupt modal-analysis results. The industrial -40C to +85C temperature range (IUKG suffix) supports outdoor and factory-floor installations. Nap and shutdown modes conserve power in battery-powered portable vibration analyzers used for predictive maintenance of rotating machinery.
推荐
Communications Test and Measurement
Production test systems for wireless infrastructure require multi-channel digitizers that can capture and analyze modulated signals with high fidelity. The LTC2271IUKG's 84.1 dB SNR and 99 dB SFDR enable accurate EVM and ACLR measurements on LTE, 5G NR, and Wi-Fi waveforms. Two channels per chip support simultaneous dual-antenna or dual-band measurement in a single test fixture, reducing fixture cost and calibration time. The SPI configuration port enables automated test-equipment (ATE) controllers to switch input ranges between measurement sweeps.
推荐
推荐产品汇总
工程参考数据： LTC2271IUKG ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | LTC2271IUKG#PBF | LTC2271CUKG#PBF | LTC2191IUKG | LTC2190IUKG | LTC2206IUK |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 52-pin QFN (7x8 mm) UKG | 52-pin QFN (7x8 mm) UKG - same | 52-pin QFN (7x8 mm) UKG - same | 52-pin QFN (7x8 mm) UKG - same | 52-pin QFN (7x8 mm) UKG - same | 52-pin QFN UK - same family |
| Resolution | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit |
| Channels | 2 (simultaneous) | 2 | 2 | 2 | 2 | 1 (single channel) |
| Sample Rate | 20 Msps | 20 Msps | 20 Msps | 20 Msps | 25 Msps | 40 Msps |
| Temperature Grade | Industrial -40C to +85C | Industrial -40C to +85C | Commercial 0C to +70C | Industrial | Industrial | Industrial |
| RoHS Compliance | Depends on suffix (#PBF lead-free) | Yes (lead-free) | Yes (lead-free) | Yes | Yes | Yes |
关键差异点
- Dual simultaneous-sampling channels with sub-ns inter-channel skew （对比 LTC2206IUK (single-channel 40 Msps))
- Highest SFDR (99 dB) in the 20 Msps dual-ADC class （对比 LTC2191IUKG (dual 20 Msps))
- SPI-configurable per-channel input range (1 Vp-p or 2.1 Vp-p) （对比 LTC2260CUJ-12 (12-bit dual 105 Msps))
设计说明
Treat the analog inputs (AIN1+/AIN1-, AIN2+/AIN2-) as a 100-ohm differential microstrip pair with matched length to within 0.5 mm to preserve SNR and SFDR. Bond the exposed pad (EP) directly to a clean analog ground plane using a 4x4 via array (12 mil holes, 25 mil pitch) for low-impedance ground return and thermal dissipation. Route the encode clock (ENC+/ENC-) as a 100-ohm differential pair with length matching within 0.1 mm of the analog inputs; any skew on ENC translates directly into aperture jitter and degrades SNR.
Decouple each AVDD pin with a 0.1 uF X7R ceramic capacitor placed within 2 mm of the pin, paired with a 10 uF tantalum or ceramic bulk capacitor. The same applies to each OVDD pin for the output buffer supply. Place a ferrite bead between the analog and digital 1.8V rails if they share a common LDO source to prevent digital switching noise from coupling into the analog domain via the supply pin. Shutdown and nap modes (controlled via SPI register) reduce power consumption by approximately 80% when only one channel is active.
Keep digital output traces (D11A_x through D0A_x) short and route them on a separate layer from the analog input traces to minimize digital-to-analog coupling. Use a continuous ground plane on an adjacent layer to provide an unbroken reference for both analog and digital signals. Avoid running digital traces directly above or below the analog input traces; if they must cross, do so at a 90-degree angle. The 52-pin QFN package has only 0.4 mm pitch; use laser-cut or chemically-etched stencils for consistent solder paste deposition to avoid shorts.
Estimated: at 20 Msps and 16-bit resolution, the analog input bandwidth must support at least 10 MHz (-3 dB) to preserve the 84.1 dB SNR. A driver op-amp such as the LT6200 or ADA4945 with at least 50 MHz GBP is recommended. Common-mode voltage at AIN1/AIN2 should be biased to VCM (typ. 0.9V) using a high-precision resistor divider or low-noise LDO follower to maximize the input dynamic range. For transformer-coupled IF inputs, use a 1:1 or 1:2 turns-ratio RF transformer with a center-tap connected to VCM.
Do not exceed the absolute maximum analog input voltage of AVDD + 0.3V; overdriving the inputs causes long-term damage to the switched-capacitor input stage. Ensure the SPI SDO/SDI lines are not driven before the LTC2271 has finished its internal calibration at power-up (typically 100 ms after AVDD stable). Failing to observe this can corrupt the calibration constants and degrade SNR. When using both channels, sample-rate mismatch between ENC and the channel configuration register will cause data misalignment at the FPGA; verify CS timing per the SPI timing diagram in the datasheet.
合规信息
RoHS-compliant when ordered with #PBF suffix. Industrial temperature grade -40C to +85C (IUKG suffix) - not AEC-Q100 qualified for automotive. The non-#PBF version may contain lead and is intended for non-RoHS applications.
