LT1711CMS8#TRPBF - 4.5ns Rail-to-Rail Comparator w/ Latch | ADI | MSOP-8
Teilenummer: LT1711CMS8#TRPBF ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $5.92 | $5,92 |
| 10 | $5.32 | $53,20 |
| 100 | $4.74 | $474,00 |
| 500 | $4.25 | $2.125,00 |
| 1.000 | $3.78 | $3.780,00 |
| 2.500 | $3.32 | $8.300,00 |
LT1711CMS8#TRPBF Übersicht
A comparator (also called a voltage comparator) is a device that compares two analog input voltages and produces a binary digital output indicating which input is larger. It is the fundamental building block at the boundary between the analog and digital domains, used in level detection, threshold sensing, line receivers, peak detectors, clock-recovery circuits, and ADC front-ends. Comparators such as the LT1711 sit within the broader analog IC hierarchy as signal-conditioning ICs that bridge linear analog signal paths and high-speed digital logic families.
Key specifications include a 4.5ns propagation delay at 20mV overdrive, 7ns at 5mV overdrive, 1.5mV maximum input offset voltage, and ±10mA output drive current. The output latch retains data when the LATCH pin is held high, with internal hysteresis to reject slow or noisy latch signals. Inputs can exceed the supply rails without phase reversal, which simplifies interfacing with bipolar sensor signals that swing beyond VCC.
Architecturally, the LT1711 uses complementary N-channel/P-channel differential input stages to achieve true rail-to-rail input common-mode range, followed by a regenerative latch core that delivers sub-5ns decision times. The TTL/CMOS-compatible complementary outputs eliminate the need for an external level translator when driving 3.3V or 5V FPGAs, ASICs, or microcontrollers.
Typical applications include high-speed automatic test equipment (ATE), window comparators for line receivers, peak/zero-crossing detectors, clock-recovery circuits, threshold detectors in instrumentation, fast analog-to-digital converter front-ends, and pulse-width measurement systems. The wide input range and latch function make it equally suited to single-supply battery-powered designs and split-rail industrial signal chains.
When designing with the LT1711, place a 0.1µF bypass capacitor as close as possible to the supply pin and minimize input trace lengths to avoid coupling transients into the high-impedance differential pair. For sub-2ns edge fidelity, use a controlled-impedance output trace terminated at the destination logic input. The output latch pin should be tied low when unused, never left floating.
This page synthesizes distributor pricing, drop-in alternatives in the same 8-MSOP footprint, and practical design notes not found in the manufacturer datasheet.
Drop-in-Alternativen für LT1711CMS8#TRPBF – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Varianten dieser Serie
Modelle derselben Serie, die drop-in-kompatibel sind mit LT1711CMS8#TRPBF (gleiche Bauform und Footprint) – abweichend in Comparator Type, Input Common-Mode Range, MSL Level, Output Latch, Output Type.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
LT1711CMS8#PBF
✅ Drop-In✓ Auf Lager
$4.1 / Stück
Datenblatt ansehen →LT1711IMS8#PBF
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
LT1711CMS8#TR
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
ADCMP361BT256Q-500RL7
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
LT6703HVCS5-2#TRMPBF
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
LT1711CMS8#TRPBF Grenzwerte & elektrische Eigenschaften
| Comparator Type | General Purpose with Latch |
| Number of Channels | 1 |
| Propagation Delay (20mV Overdrive) | 4.5 ns |
| Propagation Delay (5mV Overdrive) | 7 ns |
| Input Offset Voltage (max) | 1.5 mV |
| Supply Voltage - Single | 2.4 V to 12 V |
| Supply Voltage - Dual | ±2.4 V to ±6 V |
| Ausgangstyp | CMOS, Complementary, Rail-to-Rail, TTL |
| Output Current (typ) | ±10 mA |
| Input Common-Mode Range | Rail-to-Rail (exceeds rails without phase reversal) |
| Output Latch | Internal TTL/CMOS-compatible latch, active high |
| Betriebstemperaturbereich | -40°C to +85°C |
| Gehäuse | 8-MSOP |
| Montageart | Surface Mount |
| MSL-Level | 1 (unlimited) |
| RoHS-Status | Compliant |
| Lead-Free / #TRPBF Suffix | Yes (#PBF indicates lead-free finish) |
LT1711CMS8#TRPBF Pin-Konfiguration
| Pin 1 | V+ — Positive supply voltage (2.4V to 12V) |
| Pin 2 | IN+ — Non-inverting comparator input |
| Pin 3 | IN- — Inverting comparator input |
| Pin 4 | V- — Negative supply or GND for single-supply operation |
| Pin 5 | LATCH — Output latch enable (active high; tie low when unused) |
| Pin 6 | GND — Logic ground reference |
| Pin 7 | OUT (inverted) — Inverted complementary output (TTL/CMOS) |
| Pin 8 | OUT (true) — True complementary output (TTL/CMOS) |
Typische Anwendungen
LT1711CMS8#TRPBF ist geeignet für 6 Anwendungs: High-Speed Automatic Test Equipment (ATE), Zero-Crossing Detector for Line Receivers, Clock Recovery and Data Slicing, Peak Detector and Threshold Sensing, Window Comparator for Sensor Fault Detection, Pulse-Width Measurement and Time-to-Digital Conversion.
High-Speed Automatic Test Equipment (ATE)
The LT1711's 4.5 ns propagation delay at 20 mV overdrive and rail-to-rail complementary outputs make it ideal for pin-electronics threshold comparators in semiconductor ATE. It can detect sub-ns edge transitions on device-under-test (DUT) pins and report pass/fail results to the tester's timing ASIC within one clock cycle. The internal output latch holds the comparison result stable across long cables back to the test head, eliminating metastable triggering. Place the LT1711 at the DUT socket with a 50-ohm controlled-impedance trace to the comparator input; pair it with a fast DAC such as AD5683 for the threshold reference.
Empfohlen
Zero-Crossing Detector for Line Receivers
The rail-to-rail input stage allows the LT1711 to detect zero-crossings of AC-coupled signals that swing ±VCC or beyond, without phase reversal artifacts. This is critical for line-receiver circuits in communication and instrumentation front-ends where the signal may have a DC bias offset. The 7 ns propagation at 5 mV overdrive ensures accurate zero-crossing timing even with slow-rising inputs. The TTL-compatible complementary outputs directly drive an FPGA's LVTTL clock input for synchronous demodulation. Recommended for RS-232/RS-485 receivers, audio line drivers, and AC-mains zero-crossing circuits.
Empfohlen
Clock Recovery and Data Slicing
The LT1711's 4.5 ns delay and sub-ns rise time enable high-speed clock-data recovery (CDR) loops for serial data links up to 200 Mbps. Slice the incoming NRZ data stream with a DC threshold derived from the signal average; feed the LT1711 complementary outputs to a PLL/phase detector such as the ADuM3150 or to an FPGA CDR block. The output latch pin can be used in decision-feedback equalization (DFE) loops where the previous bit must be held while the current bit is being sliced. Pair with a low-jitter oscillator like SiTime SiT8209 for the reference.
Empfohlen
Peak Detector and Threshold Sensing
In peak detector and threshold-sensing circuits, the LT1711 compares the input signal against an external reference (typically set by a DAC or voltage divider) and produces a clean digital output when the threshold is crossed. Its 1.5 mV maximum input offset voltage ensures repeatable trip points across production units. The latch pin allows the threshold-crossing event to be held until the system controller reads it - useful in single-event detection or pulse-stretching applications. Ideal for over-voltage protection circuits, battery cell voltage monitoring, and instrumentation triggers.
Empfohlen
Window Comparator for Sensor Fault Detection
Two LT1711 stages can be combined to form a window comparator that flags when a sensor signal falls outside an acceptable range - critical for safety and fault-detection in automotive and industrial applications. The first comparator checks the upper threshold; the second checks the lower threshold; their outputs are ORed via a resistor network to produce a single fault flag. The rail-to-rail inputs handle sensor signals anywhere from 0 V to VCC without attenuation, and the complementary outputs directly drive a microcontroller interrupt pin. Suitable for ABS wheel-speed sensors, battery cell monitors, and HVAC pressure transducers.
Empfohlen
Pulse-Width Measurement and Time-to-Digital Conversion
The LT1711's sub-5 ns propagation and rail-to-rail complementary outputs enable precise pulse-width measurement in time-to-digital converter (TDC) front-ends. Feed the start pulse to one LT1711 and the stop pulse to a second LT1711; latch each comparator output with the latch pin held low after the event; read the timestamps into an FPGA TDC core for sub-ns resolution. This architecture is widely used in laser range-finding, ultrasonic flow metering, and particle physics instrumentation. Pair with a high-stability oscillator such as FOX924B-10.000 for the TDC timebase.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für LT1711CMS8#TRPBF – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | LT1711CMS8#PBF | LT1711IMS8#PBF | LT1711CMS8#TR | ADCMP361BT256Q-500RL7 |
|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 8-MSOP | 8-MSOP - same | 8-MSOP - same | 8-MSOP - same | 8-MSOP - same |
| Propagation Delay (typ) | 4.5 ns @ 20mV OD | 4.5 ns @ 20mV OD | 4.5 ns @ 20mV OD | 4.5 ns @ 20mV OD | ~30 ns (slower) |
| Supply Voltage Range | 2.4V to 12V single / ±2.4V to ±6V dual | 2.4V to 12V single | 2.4V to 12V single | 2.4V to 12V single | 2.25V to 5.5V single |
| Output Latch | Yes (active-high) | Yes (active-high) | Yes (active-high) | Yes (active-high) | No (no latch pin) |
| Operating Temperature | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C (industrial) | -40°C to +85°C | -40°C to +125°C |
| Input Offset Voltage (max) | 1.5 mV | 1.5 mV | 1.5 mV | 1.5 mV | 1.5 mV |
| Packaging Format | Tape & Reel (lead-free) | Tube (lead-free) | Tube (lead-free, industrial temp) | Tape & Reel (SnPb) | Tape & Reel |
Wichtigste Unterscheidungsmerkmale
- Ultra-low 4.5 ns propagation delay in MSOP-8 (vs. ADCMP361BT256Q-500RL7)
- Integrated output latch with internal hysteresis (vs. Generic comparator without latch (e.g., LT1017))
- Rail-to-rail inputs that tolerate over-rail signals (vs. Traditional comparators with phase reversal)
Designhinweise
Place a 0.1 µF low-ESR ceramic bypass capacitor within 5 mm of the V+ pin (pin 1) to suppress supply ringing that couples into the high-gain input stage. For dual-supply operation, add a second 0.1 µF cap at the V- pin. The LT1711's 4.5 ns switching edge can create 100 mA transient currents; inadequate bypassing directly degrades PSRR and can cause output chatter. Estimated: assuming 100 mA transient at 0.5 ns edge time into 1 nH inductance produces 50 mV supply droop - bypass capacitance must absorb this within one clock cycle.
Route the differential input pair (IN+ at pin 2, IN- at pin 3) as a matched-length, symmetric trace to minimize common-mode-to-differential conversion. Use a 50-ohm controlled-impedance transmission line for distances above 5 mm, and add 100-ohm source termination resistors close to the inputs to damp reflections. The output traces (pins 7 and 8) should also be 50-ohm controlled-impedance with destination-side termination at the destination logic input. Ground plane underneath the entire signal path; avoid splitting the ground plane under the comparator.
Never leave the LATCH pin (pin 5) floating - tie it to ground via a 10 kΩ resistor or directly to the active-low pin of a logic gate. A floating latch pin can drift into the linear region and cause the output to be held in a metastable state. Similarly, do not exceed the absolute maximum differential input voltage of ±10 V or apply reverse bias larger than 1 V across the inputs. When operating single-supply, ensure V- (pin 4) is tied directly to ground with a wide trace to handle the return current of the output stage.
Keep the input pair away from switching signals and digital clocks. Add a ground guard ring around the input pair, stitched to the ground plane with 5-10 vias. For sub-2 ns edge fidelity, avoid running output traces parallel to the inputs - cross them at 90° if necessary. The exposed thermal pad (where present) should be soldered to the ground plane to provide thermal relief and low-impedance ground return.
Compliance-Informationen
#PBF and #TRPBF suffixes indicate lead-free (Pb-free) finish per Analog Devices' packaging convention. RoHS compliance confirmed by DigiKey and Mouser product pages. Not AEC-Q100 qualified; automotive applications should use LT1711-MS automotive variant if available.
