LTC6754HUD - 1.8ns R2R LVDS Comparator | Analog Devices | QFN-12
부품 번호: LTC6754HUD ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $3.03 | $3.03 |
| 10 | $2.72 | $27.20 |
| 100 | $2.42 | $242.00 |
| 500 | $2.18 | $1,090.00 |
| 1,000 | $1.95 | $1,950.00 |
LTC6754HUD 개요
A high-speed comparator is an analog building block that compares two input voltages and produces a logic-level output indicating which input is larger, optimized for sub-nanosecond decision latency. Within the signal-chain hierarchy, comparators sit between operational amplifiers (continuous-time gain) and logic gates (sampled decision), and feed directly into high-speed ADCs, clock-data recovery blocks, and threshold-detection circuits. The LTC6754 belongs to the LVDS-output comparator family, which trades CMOS/TTL swing for low-noise differential signaling to minimize EMI and ground bounce in dense, multi-gigabit designs.
Key features that distinguish the LTC6754 include its true rail-to-rail input stage that maintains linearity across the entire common-mode range, an integrated LVDS driver that produces a 350 mV differential swing into a 100 Ω termination, and a separate shutdown pin for power savings in duty-cycled applications. The exposed-pad QFN-12 (3x3 mm) package yields a thermal resistance of approximately 38 °C/W, sufficient for the modest power dissipation typical of a single-supply LVDS comparator (roughly 23 mA quiescent current).
Architecturally, the LTC6754 uses a regenerative latch stage following a rail-to-rail input pre-amplifier, allowing both high-speed transitions and low-input-bias currents. The LVDS output stage complies with the ANSI/TIA/EIA-644-A standard, which enables direct connection to FPGAs and ASICs with built-in LVDS receivers without external level translation.
Typical applications include high-speed instrumentation triggers, threshold detection in radar and LIDAR front-ends, clock-and-data recovery loops, satellite communication IF stages, and zero-crossing detectors in motor control. The LVDS output is especially valuable in noisy environments such as factory automation or automotive ECU test systems where single-ended CMOS would couple switching transients into sensitive analog paths.
Designers should note that the VCCI and VCCO supplies can be tied to a single rail, but separating them allows the input stage to operate from one domain while the output swings into a different supply. Termination of the LVDS pair with a 100 Ω differential resistor close to the receiver is essential to prevent reflections at toggle rates above 500 Mbps.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes for the LTC6754HUD that complement the manufacturer datasheet with selection guidance and cross-references.
드롭인 대체품: LTC6754HUD — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
LTC6754HUD#TRPBF
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LTC6754IUD#PBF
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
LTC6754MPUD#PBF
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
LTC6754HUD 최대 정격 & 전기적 특성
| Number of Comparators | 1 |
| Comparator Type | General Purpose |
| 출력 유형 | LVDS Compatible |
| Propagation Delay | 1.8 ns (typical) |
| Propagation Delay Dispersion | 1 ns (10 mV to 125 mV overdrive) |
| Toggle Rate | Up to 890 Mbps |
| Input Common-Mode Range | Rail-to-Rail |
| Supply Voltage VCCI | 2.4 V to 5.25 V |
| Supply Voltage VCCO | 2.4 V to 5.25 V |
| LVDS Swing | 350 mV differential (typ) |
| LVDS Termination | 100 Ω differential |
| 동작 온도 | -40 °C to +125 °C |
| 패키지 | 12-pin QFN (3x3 mm) with exposed pad |
| 실장 유형 | Surface Mount |
| RoHS 상태 | Compliant |
LTC6754HUD 핀 구성
| 핀 1 | VCCO — Output supply voltage (2.4 V to 5.25 V) |
| 핀 2 | GND — Ground |
| 핀 3 | OUT- — LVDS negative output |
| 핀 4 | OUT+ — LVDS positive output |
| 핀 5 | LATCH — Latch enable (active low) |
| 핀 6 | SHDN — Shutdown (active low) |
| 핀 7 | VCCI — Input supply voltage (2.4 V to 5.25 V) |
| 핀 8 | IN- — Inverting input |
| 핀 9 | IN+ — Non-inverting input |
| 핀 10 | L/E/HYST — Latch/Enable/Hysteresis configuration pin |
| 핀 11 | NC — Not connected (per datasheet) |
| 핀 12 | NC — Not connected (per datasheet) |
일반적인 애플리케이션
LTC6754HUD 적합 용도: 6 애플리케이션s: High-Speed Instrumentation Triggers, LIDAR and Radar Threshold Detection, Clock-and-Data Recovery (CDR) Loops, Zero-Crossing Detectors in Motor Control, ATE (Automatic Test Equipment) Comparators, Satellite IF Stage Threshold Detection.
High-Speed Instrumentation Triggers
The LTC6754HUD's 1.8 ns propagation delay and 1 ns overdrive dispersion make it ideal for edge-trigger and pulse-width discriminator circuits in oscilloscopes, spectrum analyzers, and time-domain reflectometers. Designers place it between the analog input attenuator and the FPGA timing engine, terminating the LVDS output with a 100 Ω differential resistor at the FPGA receiver pin. Compared to slower CMOS-output comparators, the LVDS swing minimizes ground bounce when several channels trigger simultaneously on dense 4-layer PCBs.
추천
LIDAR and Radar Threshold Detection
The LTC6754HUD's sub-2 ns latency and 890 Mbps toggle rate align with the return-pulse timing requirements of automotive and industrial LIDAR/radar front-ends. Mounted at the output of the photodiode transimpedance amplifier, it compares the return-signal amplitude to a programmable threshold DAC and emits an LVDS pulse directly to the FPGA time-to-digital converter. The 1 ns dispersion across the 10-125 mV overdrive range preserves sub-cm ranging accuracy under varying return amplitudes, critical for object localization.
추천
Clock-and-Data Recovery (CDR) Loops
The LTC6754HUD's 1.8 ns propagation delay suits it as the phase-detector element in clock-and-data recovery loops for serial links operating up to several hundred megabits per second. Connected between the received data eye and the PLL charge pump, its LVDS differential output feeds directly into an FPGA CDR primitive, eliminating level-translation buffers. The rail-to-rail input stage accepts AC-coupled data centered on any common-mode voltage between VCCI rails, simplifying AC-coupled serial-link interfaces across diverse standards.
추천
Zero-Crossing Detectors in Motor Control
The LTC6754HUD detects the zero-crossing point of motor back-EMF waveforms in sensorless BLDC and PMSM motor drives, replacing slower opto-isolated zero-cross circuits. Its 1.8 ns latency provides accurate commutation timing at high electrical speeds, while the LVDS output drives isolated gate-driver logic through digital isolators such as the ISO7761 with minimal pulse-width distortion. The 2.4-5.25 V supply range allows direct connection to 3.3 V or 5 V MCU rails without level shifters.
추천
ATE (Automatic Test Equipment) Comparators
The LTC6754HUD provides fast go/no-go threshold detection in production ATE pin-electronics cards where dozens of comparators per test head must operate in parallel without mutual interference. The LVDS output's inherent common-mode rejection prevents switching noise from one comparator from corrupting adjacent analog measurement channels. Its 12-pin QFN (3x3 mm) footprint allows dense placement on the test-head analog measurement board alongside high-density DAC and ADC channels.
추천
Satellite IF Stage Threshold Detection
The LTC6754HUD's radiation-tolerant pinout and 1.8 ns latency suit it for satellite IF-stage demodulator threshold detection in Ku-band and Ka-band receiver chains. After the IF SAW filter, the comparator reconstructs the digital data stream from the demodulated BPSK/QPSK waveform and emits an LVDS pulse stream directly to the radiation-hardened FPGA bit-synchronizer. The 2.4-5.25 V supply aligns with typical satellite 3.3 V secondary rails and accepts wide input common-mode for direct-coupled demodulator outputs.
추천
추천 제품 요약
엔지니어링 참조 데이터: LTC6754HUD — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | LTC6754HUD#TRPBF | LTC6754IUD#PBF | LTC6754MPUD#PBF |
|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | QFN-12 (3x3 mm) | QFN-12 (3x3 mm) - same | QFN-12 (3x3 mm) - same | QFN-12 (3x3 mm) - same |
| Propagation Delay | 1.8 ns | 1.8 ns | 1.8 ns | 1.8 ns |
| Toggle Rate | 890 Mbps | 890 Mbps | 890 Mbps | 890 Mbps |
| Supply Voltage | 2.4 V to 5.25 V | 2.4 V to 5.25 V | 2.4 V to 5.25 V | 2.4 V to 5.25 V |
| Output Type | LVDS | LVDS | LVDS | LVDS |
| Operating Temperature | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +85 °C | -55 °C to +125 °C |
| Packaging Form | Tube | Tape & Reel (7-inch) | Tube | Tube |
주요 차별점
- Sub-2 ns propagation with 1 ns dispersion (vs TLV3501 (Texas Instruments))
- Independent VCCI and VCCO supplies (vs ADCMP604 (Analog Devices))
- Independent latch and shutdown pins (vs MAX999 (Maxim))
설계 노트
Place the 100 Ω differential termination resistor within 5 mm of the FPGA LVDS receiver pins to minimize reflections at toggle rates above 500 Mbps. Use 50 Ω single-ended controlled-impedance traces (90 Ω differential) routed symmetrically with matched length (±1 mm) between OUT+/OUT- and the receiver. The exposed pad must be soldered to a continuous ground plane with multiple thermal vias to keep junction temperature rise below 30 °C at full toggle activity.
Decouple VCCI and VCCO separately with a 0.1 µF X7R ceramic capacitor placed within 2 mm of each supply pin, plus a 10 µF bulk capacitor at the regulator output. VCCI and VCCO can share a common rail if the downstream logic operates at the same voltage, but separating them allows the input stage to operate from a quieter analog supply while the LVDS output swings into a digital domain. Add a small ferrite bead on VCCO if the comparator switching transients couple into the analog input.
Do not leave the LATCH, SHDN, or L/E/HYST pins floating - the datasheet specifies that these inputs float to valid logic levels by default, but noisy board environments can cause undefined behavior. Tie SHDN high through a 10 kΩ resistor to VCCI to keep the comparator always enabled, and configure L/E/HYST per the desired hysteresis mode. AC-coupling the inputs without DC bias will push the common-mode outside the rail-to-rail range; either DC-couple or bias the input network to mid-supply.
Estimated: at 890 Mbps toggle rate with 100 Ω differential termination, the LVDS output drives approximately 3.5 mA of differential current per transition. Maintain a continuous reference plane under the differential pair to control impedance and minimize return-path discontinuities. Keep the LVDS traces away from clock and switching-power traces; if they must cross, do so at 90° to minimize coupling.
규정 준수 정보
RoHS compliant per Analog Devices product page. The standard LTC6754HUD#PBF is not AEC-Q100 qualified; check the AEC-Q100 catalog (LTC6754HUD-Q1 or equivalent automotive suffix) for automotive-grade variants. Halogen-free status not stated in available data.
