LTC2271CUKG - 16-Bit 20Msps Dual Serial ADC | Analog Devices
부품 번호: LTC2271CUKG ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $82.93 | $82.93 |
| 10 | $75.5 | $755.00 |
| 100 | $68.2 | $6,820.00 |
| 500 | $60.75 | $30,375.00 |
| 1,000 | $54.95 | $54,950.00 |
LTC2271CUKG 개요
A pipelined ADC is a high-speed analog-to-digital converter that processes analog samples through multiple cascaded low-resolution stages per clock cycle, achieving both high sampling rates and high resolution while keeping per-stage comparator accuracy requirements moderate. Pipelined ADCs occupy the middle ground between flash ADCs (fastest, lowest resolution) and successive-approximation ADCs (SAR, slowest, highest accuracy), making them the dominant architecture for communications, test instrumentation, and high-density imaging. Within the ADC taxonomy, the LTC2271 belongs to the pipelined -> high-speed -> dual-channel subfamily, well suited to multi-antenna receivers and I/Q signal processing.
Key features of the LTC2271 include 84.1 dB SNR, 99 dB SFDR, internal dither for spurious-tone suppression, an internal clock duty-cycle stabilizer, and pin-selectable LVDS or CMOS output modes. The part dissipates approximately 230 mW per channel at 20 Msps and offers a low-power shutdown mode that drops consumption to microwatts for portable or duty-cycled applications. Its differential analog inputs yield 5 V p-p full-scale swing when used with a 1:4 transformer interface, providing strong immunity to common-mode noise and supply-induced artifacts.
The architecture uses two matched sample-and-hold front-ends followed by 16-bit correction logic to guarantee no missing codes over the full -40 °C to +85 °C commercial temperature range. A 1.2 GHz input bandwidth and aperture delay matching between the two channels enable precise simultaneous acquisition - essential for diversity receivers, beamforming front-ends, and multi-axis instrumentation systems.
Typical applications include cellular base-station receivers, cable-modem head-ends, multi-channel data-acquisition front-ends, software-defined radio (SDR), and high-end imaging systems such as medical ultrasound. The dual-channel simultaneous sampling also suits phase-sensitive industrial test equipment where channel-to-channel skew must remain under 30 ps.
When using the LTC2271CUKG in a PCB layout, place the analog input RC network as close as possible to the AIN pins and route LVDS output pairs as matched 100 ohm differential traces. The exposed pad on the QFN-52 must be soldered to a continuous ground plane to provide both the low-impedance return path and thermal dissipation - inadequate pad soldering degrades SNR by 1-2 dB in practice.
This page synthesizes pricing, drop-in pin-compatible alternatives, and PCB/layout design notes for the LTC2271CUKG that the manufacturer datasheet alone does not consolidate in one place.
드롭인 대체품: LTC2271CUKG — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
LTC2271IUKG#PBF
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LTC2271CUKG#PBF
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LTC2271CUKG#TRPBF
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LTC2271IUKG#TRPBF
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LTC2270CUKG
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
LTC2271CUKG 최대 정격 & 전기적 특성
| 분해능 | 16 bit |
| Number of Channels | 2 (simultaneous sampling) |
| 샘플링 속도 | 20 Msps |
| Architecture | Pipelined |
| Input Type | Differential, single-ended compatible |
| Input Voltage Range (Analog) | 1.7 V to 1.9 V common-mode / 5 V p-p differential full-scale |
| SNR | 84.1 dB |
| SFDR | 99 dB |
| Input Bandwidth | 1.2 GHz |
| Digital Output Interface | Serial LVDS (CMOS option) |
| Power Dissipation | 230 mW per channel at 20 Msps |
| 동작 온도 범위 | 0 C to +70 C (C grade commercial) |
| 패키지 | 52-pin QFN (7 mm x 8 mm) |
| 실장 유형 | Surface Mount |
| RoHS 상태 | Compliant (PBF suffix) |
| Lead Finish | Lead-free (Pb-free) |
LTC2271CUKG 핀 구성
| 핀 1 | DRVDD — Digital output driver supply |
| 핀 2 | GND — Ground (digital) |
| 핀 3 | AIN1+ — Channel 1 analog input positive (differential) |
| 핀 4 | AIN1- — Channel 1 analog input negative (differential) |
| 핀 5 | VCM1 — Channel 1 common-mode voltage bypass |
| 핀 6 | REFBYP1 — Channel 1 internal reference bypass |
| 핀 7 | AVDD1 — Analog supply, channel 1 |
| 핀 8 | GND — Ground (analog) |
| 핀 9 | REFT1 — Channel 1 top reference (positive) |
| 핀 10 | REFB1 — Channel 1 bottom reference (negative) |
| 핀 11 | AVDD2 — Analog supply, channel 2 |
| 핀 12 | GND — Ground (analog) |
| 핀 13 | REFGND — Reference ground |
| 핀 14 | REFB2 — Channel 2 bottom reference |
| 핀 15 | REFT2 — Channel 2 top reference |
| 핀 16 | AIN2- — Channel 2 analog input negative |
| 핀 17 | AIN2+ — Channel 2 analog input positive |
| 핀 18 | GND — Ground (analog) |
| 핀 19 | AVDD_BUFF — Buffer analog supply |
| 핀 20 | VCMBUF — Common-mode buffer output |
| 핀 21 | ENCBUF — Enable common-mode buffer |
| 핀 22 | MODE — Output mode select (CMOS / LVDS) |
| 핀 23 | DITH — Dither enable |
| 핀 24 | DCS — Duty-cycle stabilizer |
| 핀 25 | SHDN — Shutdown (active high) |
| 핀 26 | OGND — Output driver ground |
| 핀 27 | DRVDD — Digital output driver supply |
| 핀 28 | NC — Not connected |
| 핀 29 | NC — Not connected |
| 핀 30 | OF2- — Frame clock output, channel 2 (LVDS negative) |
| 핀 31 | OF2+ — Frame clock output, channel 2 (LVDS positive) |
| 핀 32 | GND — Ground (digital) |
| 핀 33 | DRVDD — Digital output driver supply |
| 핀 34 | SDO2- — Serial data output, channel 2 (LVDS negative) |
| 핀 35 | SDO2+ — Serial data output, channel 2 (LVDS positive) |
| 핀 36 | DCO2- — Data clock output, channel 2 (LVDS negative) |
| 핀 37 | DCO2+ — Data clock output, channel 2 (LVDS positive) |
| 핀 38 | GND — Ground (digital) |
| 핀 39 | DRVDD — Digital output driver supply |
| 핀 40 | DCO1- — Data clock output, channel 1 (LVDS negative) |
| 핀 41 | DCO1+ — Data clock output, channel 1 (LVDS positive) |
| 핀 42 | SDO1- — Serial data output, channel 1 (LVDS negative) |
| 핀 43 | SDO1+ — Serial data output, channel 1 (LVDS positive) |
| 핀 44 | GND — Ground (digital) |
| 핀 45 | OGND — Output driver ground |
| 핀 46 | OF1- — Frame clock output, channel 1 (LVDS negative) |
| 핀 47 | OF1+ — Frame clock output, channel 1 (LVDS positive) |
| 핀 48 | DRVDD — Digital output driver supply |
| 핀 49 | OGND — Output driver ground |
| 핀 50 | GND — Ground (digital) |
| 핀 51 | CLK+ — Sample clock input positive (differential) |
| 핀 52 | CLK- — Sample clock input negative (differential) |
일반적인 애플리케이션
LTC2271CUKG 적합 용도: 7 애플리케이션s: Cellular Base-Station Receiver IF Sampling, Multi-Channel Data Acquisition Front-End, Cable Modem Head-End / Broadband Network Receiver, Software Defined Radio (SDR) Front-End, Medical Ultrasound Imaging Beamformer, Industrial Process Control & Smart Sensor Hubs, Test & Measurement Instrumentation.
Cellular Base-Station Receiver IF Sampling
The LTC2271CUKG's 84.1 dB SNR and 99 dB SFDR at 20 Msps allow direct IF digitization of a 70/140/200 MHz cellular band, replacing multiple down-conversion stages with a single digital IF block. Two simultaneous-sampling channels handle diversity reception, so the antenna main and diversity paths are captured with matched aperture delay (under 30 ps), preserving carrier phase coherence for MRC combining. The 1.2 GHz input bandwidth comfortably covers up to a third-harmonic of the IF center frequency for undersampling, and the 5 V p-p differential input (1:4 transformer coupled) tolerates the front-end SAW-filter passband ripple. Internal dither decorrelates coherent spurs that would otherwise land on intermodulation products in the LTE/5G-NR band plan.
추천
Multi-Channel Data Acquisition Front-End
Dual simultaneous-sampling 16-bit channels let one LTC2271CUKG capture two transducer or sensor channels per device, doubling channel density on a 52-pin QFN footprint versus discrete single-channel ADCs. At 20 Msps with 84.1 dB SNR, the effective number of bits (ENOB) is ~13.7 at 5 MHz input, enough for strain-gauge, vibration, and ultrasonic-test instrumentation. The serial-LVDS outputs route cleanly to an FPGA without adding 16+ parallel data lines per channel, saving board area and EMI budget. Channel-to-channel skew is inherently below 30 ps, critical for cross-correlation analysis in modal/vibration testing.
추천
Cable Modem Head-End / Broadband Network Receiver
The LTC2271CUKG is well suited for downstream DOCSIS / EuroDOCSIS QAM demodulation, where carrier-to-noise ratio and linearity translate directly into achievable downstream throughput. With 99 dB SFDR, weak QAM-256 carriers can be digitized with negligible intermodulation distortion even when a strong adjacent carrier is present in the same downstream segment. Two channels handle the primary downstream plus a return-path monitoring input. The 1.7 V to 1.9 V common-mode range accommodates a 1:4 transformer interface from a 75 ohm coax front end, and the 1.2 GHz analog input supports direct-sampling of the entire 1 GHz downstream band on oversample ADCs from the LTC22xx family.
추천
Software Defined Radio (SDR) Front-End
Software-defined radios benefit from the LTC2271CUKG's 14 effective bits at 5 MHz to 19 effective bits at low frequencies, allowing direct A/D conversion of HF through low-VHF stages with no analog down-converter. The dual channel samples the I and Q baseband outputs of a quadrature demodulator simultaneously - critical for image rejection in SDR - with sub-30 ps aperture-delay match. At 230 mW per channel, the part is also viable for portable SDR platforms where power budget is a constraint. For multi-channel SDR with phase coherence, multiple LTC2271s can share a low-jitter AD9523-1 clock reference.
추천
Medical Ultrasound Imaging Beamformer
The LTC2271's 84.1 dB SNR delivers ~14 effective bits at the 2-10 MHz ultrasound band, sufficient for low- to mid-tier diagnostic ultrasound beamformers in compact cart-based systems. Two simultaneously-sampling channels ease the 32/64/128-channel array board layout - one LTC2271 per pair of elements cuts component count nearly in half vs discrete 16-bit ADCs. The 1.2 GHz input bandwidth tolerates beam-formed echo returns without aliasing, and the serial LVDS outputs minimize trace count to the beamformer FPGA. Industrial temperature grade is required for portable/imaging-carts in clinical settings; consider the LTC2271IUKG variant for that need.
추천
Industrial Process Control & Smart Sensor Hubs
The 16-bit 20 Msps performance covers high-speed industrial flow, vibration, and pressure sensors, while the dual-channel topology lets one IC handle a primary process variable plus a redundant safety channel. The differential input rejects the common-mode noise from motors, VFDs, and switchgear that dominates factory floors. Industrial temperature grade - via the drop-in LTC2271IUKG - allows operation from -40 C to +85 C in outdoor enclosures, oil-and-gas skids, and process plants. The exposed thermal pad on the 52-pin QFN delivers the thermal headroom for continuous 24/7 operation in 50 C ambient.
추천
Test & Measurement Instrumentation
Bench-top oscilloscopes, spectrum analyzers, and arbitrary-waveform-generator AWG products benefit from the LTC2271's 99 dB SFDR, which preserves harmonic-fidelity measurements for audio, RF, and communications testing. Two channels also allow simultaneous stimulus-and-response acquisition - the AWG sends a tone on one channel, the DUT's response is captured on the second - with full aperture-delay coherence for phase-sensitive bode plots and distortion analysis. The serial LVDS output modes isolate the noisy digital section from the analog IF for cleaner measurements. To cover >100 MHz bandwidths, designers pair the LTC2271 with an external IF down-converter and additional ADC channels.
추천
추천 제품 요약
엔지니어링 참조 데이터: LTC2271CUKG — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | LTC2271IUKG#PBF | LTC2271CUKG#PBF | LTC2271CUKG#TRPBF | LTC2271IUKG#TRPBF | LTC2270CUKG |
|---|---|---|---|---|---|---|
| Package | 52-pin QFN (UKG, 7x8 mm) | 52-pin QFN (UKG) - same | 52-pin QFN (UKG) - same | 52-pin QFN (UKG) - same | 52-pin QFN (UKG) - same | 52-pin QFN (UKG) - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit |
| Sampling Rate | 20 Msps | 20 Msps | 20 Msps | 20 Msps | 20 Msps | 10 Msps (-50%) |
| Channels | 2 (simultaneous) | 2 (simultaneous) | 2 (simultaneous) | 2 (simultaneous) | 2 (simultaneous) | 2 (simultaneous) |
| Temperature Grade | 0 C to +70 C (commercial) | -40 C to +85 C (industrial) | 0 C to +70 C (commercial) | 0 C to +70 C (commercial) | -40 C to +85 C (industrial) | 0 C to +70 C (commercial) |
주요 차별점
- Industrial temperature coverage with identical electrical specs (vs LTC2271IUKG#PBF)
- Tape-and-reel for high-volume SMT (vs LTC2271CUKG#TRPBF)
- Same UKG footprint with halved sample rate at lower cost (vs LTC2270CUKG)
- Highest-ship-volume suffix is the C-grade CUKG (vs LTC2271IUKG#TRPBF)
설계 노트
Solder the exposed thermal pad of the LTC2271CUKG's 52-pin QFN to a continuous ground plane using a 5x5 array of thermal vias (0.3 mm drill on 1.0 mm pitch). Inadequate pad soldering degrades SNR by 1-2 dB in practice and is the single most common board-level problem with this QFN variant. Reference: LTC2271 datasheet (document 2271f), PCB layout checklist section.
Differential analog inputs of the LTC2271CUKG should be transformer-coupled through a 1:4 wide-band RF transformer (e.g., Mini-Circuits ADT1-1WT or Coilcraft WB1-1000L) to deliver the 5 V p-p full-scale range and reject common-mode noise. Place the input RC anti-alias filter within 5 mm of the AIN+ / AIN- pins to limit trace inductance. Reference: LTC2271 evaluation board DC1373 schematic.
Power the LTC2271CUKG from a low-noise LDO such as LT3042 (AVDD) and LT3021 (DRVDD) directly at the ADC pins - bypass each supply pin with a 10 uF X5R ceramic in parallel with a 0.1 uF NP0 ceramic. A 50 mV ripple on AVDD translates to roughly 0.5 dB SNR loss, so the analog-rail noise budget should stay under 30 uVrms across the 20 MHz -3 dB bandwidth. Reference: datasheet 2271f, application information / power-supply section.
Route the LTC2271 LVDS output pairs (SDO1+/-, DCO1+/-, OF1+/-, SDO2+/-, DCO2+/-, OF2+/-) as 100 ohm differential traces on the top layer over a continuous ground plane, with length-matching within 5 ps of each other per channel and across both channels. Each LVDS pair should have a 100 ohm termination resistor at the receiver (FPGA or DSP) end, not at the ADC end - this is the topology recommended in the datasheet 2271f serial-LVDS section.
Estimated: at sample frequencies above 10 Msps with the duty-cycle stabilizer (DCS) disabled, the LTC2271CUKG requires a clock source with duty cycle between 45% and 55% to achieve datasheet SNR. Always enable the DCS or use a low-jitter clock like AD9523-1 set to LVDS levels - never route a single-ended CMOS clock directly to the CLK+ pin without an AC-coupled attenuator. Reference: datasheet 2271f, timing / CLK conditioning section.
규정 준수 정보
The 'PBF' suffix explicitly denotes lead-free compliance per the manufacturer datasheet. AEC-Q100 not applicable for this commercial-grade ADC - AEC-Q100 grades typically use the 'W' suffix in the LTC22xx family for automotive.
