THS788PFD - 200 MHz Quad-Channel 13 ps TMU | Texas Instruments
Référence : THS788PFD ✓ ActifTHS788PFD Présentation
A time measurement unit is a specialized clock-and-timing semiconductor that converts the elapsed time between events into a digital result. The THS788 belongs to the TMU hierarchy, where its TDC architecture combines fine timing resolution with high-rate event capture. This makes it suitable for systems requiring precise timing rather than ordinary counting, including synchronized instrumentation, pulsed systems, test equipment, and communications or industrial timing subsystems.
The key performance feature is 8 ps single-shot accuracy, supported by a 13 ps least-significant-bit resolution. The external controller clock operates at 200 MHz, and the event input rate can reach 200 MHz. The 7 s result range supports substantially longer measurement intervals than the 13 ps conversion resolution alone would imply, depending on the configured measurement sequence and system implementation. LVDS-compatible interfaces provide high-speed, noise-resistant signaling for demanding board environments.
Technically, the THS788 uses a fast TDC architecture to perform time measurements across four event channels. Its inputs are designed for LVCMOS or LVDS signaling, while the result output is identified as LVDS. The synchronized architecture and dedicated sync channel make the device suitable for multi-event acquisition where repeatable timing relationships matter. The stated low temperature coefficient of 0.1 ps/°C indicates attention to timing stability over temperature.
Typical applications include high-speed test and measurement systems, pulsed-signal analysis, synchronization of multiple timing events, industrial automation requiring deterministic event capture, and communications equipment that must measure narrow time intervals. The device can also support scientific instrumentation where event timing accuracy directly affects the quality of the collected result.
Designers should treat the external 200 MHz clock, LVDS-compatible input routing, result interface, decoupling, and high-speed return paths as an integrated signal-integrity problem. Input timing, trace length, termination, and controller configuration must be evaluated together because the 13 ps resolution does not guarantee end-to-end system accuracy without clean clocking, controlled stimulus, and correct interface implementation.
This page combines the verified manufacturer and distributor information for the THS788PFD with practical selection guidance, application analysis, pricing references, and an honest assessment of available drop-in alternatives.
Alternatives de remplacement direct pour THS788PFD — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
THS788
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
THS788PFD Spécifications
| Product Type | Quad-Channel Time Measurement Unit (TMU) |
| Time-to-Digital Converter Resolution | 13 ps (LSB) |
| Single-Shot Accuracy | 8 ps, one sigma |
| Controller Clock Frequency | 200 MHz |
| Event Input Rate | 200 MHz |
| Measurement Result Range | 7 s |
| Number of Event Channels | 4 |
| Synchronization Channels | 1 |
| Input Interface | LVCMOS or LVDS |
| Result Output Interface | LVDS |
| Temperature Coefficient | 0.1 ps/°C |
| Architecture | Time-to-Digital Converter (TDC) |
| Boîtier | 100-HTQFP (14 x 14 mm) |
| Type de montage | Surface Mount |
| PLL | No |
| Number of Circuits | 1 |
| Input-to-Output Ratio | 2:1 |
Guide de configuration des broches du THS788PFD 100-htqfp (14 x 14 mm)
Configuration des broches du THS788PFD (boîtier 100-htqfp (14 x 14 mm)). La numérotation des broches, les fonctions et les schémas de connexion sont définis dans la fiche technique du fabricant. Consultez-la pour l'empreinte exacte et les directives de soudage.
Aucune donnée de brochage détaillée disponible pour THS788PFD.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
THS788PFD convient pour 6 applications: High-Speed Test and Measurement, Pulsed-Signal Characterization, Synchronized Multi-Event Acquisition, Industrial Automation Timing, Communications Event Timing, Scientific Instrumentation.
High-Speed Test and Measurement
The THS788PFD is suitable for instruments that measure fine time intervals between rapidly arriving events. Its four event channels can capture related signals at rates up to 200 MHz, while the 13 ps TDC resolution and 8 ps one-sigma single-shot accuracy preserve timing detail that a conventional counter may not resolve. The 7 s result range also supports measurements extending well beyond the instantaneous conversion interval. In a test system, the LVDS-compatible inputs and LVDS result interface should be implemented with controlled impedance, proper source termination, and an external 200 MHz controller clock. Calibration, reference-clock quality, and fixture delay must be included in the uncertainty budget because the device specification alone does not describe end-to-end measurement accuracy.
Pulsed-Signal Characterization
The THS788PFD can serve as the timing-measurement element in a pulsed-source test system where pulse arrival, delay, or channel-to-channel skew must be characterized. Four event channels allow multiple related pulses to be observed within one acquisition device, and the 13 ps least-significant-bit resolution provides a fine digital timing representation. The 8 ps single-shot specification is particularly relevant when pulse timing varies between shots rather than only at one operating point. For practical use, the source under test should be connected through a repeatable fixture, while cable delay, probe loading, clock jitter, and trigger-path mismatch should be measured or calibrated. LVDS-compatible event inputs help preserve signal integrity when the tested events are small and fast.
Synchronized Multi-Event Acquisition
The THS788PFD is appropriate for acquisition systems that need coordinated measurements from several event sources. Its four event channels and separate synchronization channel support a timing architecture in which one event establishes a reference and the others are measured relative to that reference. With a maximum event-input rate of 200 MHz and 13 ps resolution, the device can capture close timing relationships that are important in synchronization and diagnostic systems. The designer must define which events are asynchronous, which are clock-related, and how the external 200 MHz controller clock aligns with them. Source termination, matched routing, and careful ground and power return paths are required to prevent timing errors from becoming indistinguishable from the event under test.
Industrial Automation Timing
The THS788PFD can support precision industrial automation and machine-control subsystems that must compare events occurring only tens of picoseconds apart. Its 13 ps resolution and 8 ps one-sigma single-shot accuracy provide substantially finer timing information than conventional millisecond or microsecond control loops. Four channels permit monitoring several sensors, triggers, or actuator events within one common time base, and the 7 s result range supports long observation windows. Industrial use should focus on deterministic signal paths and validated event conditioning rather than directly connecting noisy sensors to the timing inputs. Conditioning, isolation, level translation, and trigger filtering must preserve the timing relationships being measured, while the 0.1 ps/°C temperature coefficient supports stable operation when temperature variation is controlled.
Communications Event Timing
The THS788PFD is suitable for specialized communications equipment that must measure event arrival times, propagation delay, or synchronization errors at high speed. The four-channel architecture supports parallel event observation, while 200 MHz input capability and LVDS-compatible signaling align with high-speed digital links. Its 13 ps TDC resolution enables detailed analysis of timing margins beyond ordinary cycle counting. Integrating the device requires careful examination of equalization, clock recovery, jitter, packet-processing latency, and the distinction between data arrival time and physical-layer event time. The external 200 MHz controller clock and LVDS result interface should be referenced to a low-jitter distribution network. Firmware calibration and environmental characterization should be included if the system must maintain accuracy beyond the device-level timing specifications.
Scientific Instrumentation
The THS788PFD can support scientific instruments that correlate stimulus events with detector or sensor responses. Four event channels allow several timing landmarks to be recorded against a common acquisition sequence, and the 8 ps one-sigma single-shot accuracy supports precision measurements in time-of-flight, photon-correlation, ultrasonic, or materials-characterization systems. The device should be treated as part of a calibrated measurement chain rather than an absolute time reference. Trigger delay, detector jitter, optical or acoustic propagation time, cable delay, temperature drift, and clock stability all contribute to system uncertainty. LVDS-compatible inputs help preserve fast transitions, while controlled grounding and short return paths reduce susceptibility to coupling. Final reported accuracy should be derived from the complete calibrated system.
Données de référence d'ingénierie pour THS788PFD — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | THS788 |
|---|---|---|
| Brand | Texas Instruments | Texas Instruments |
| Package | 100-HTQFP (14 x 14 mm) | 100-HTQFP (14 x 14 mm) |
| Product Type | Quad-Channel Time Measurement Unit (TMU) | Quad-Channel Time Measurement Unit (TMU) |
| TDC Resolution | 13 ps (LSB) | 13 ps (LSB) |
| Single-Shot Accuracy | 8 ps, one sigma | 8 ps, one sigma |
| Controller Clock | 200 MHz | 200 MHz |
| Event Input Rate | 200 MHz | 200 MHz |
| Result Range | 7 s | 7 s |
| Event Channels | 4 plus 1 synchronization channel | 4 plus 1 synchronization channel |
| Input and Output Interfaces | LVCMOS or LVDS inputs; LVDS result output | LVCMOS or LVDS inputs; LVDS result output |
Principaux différenciateurs
- Four-channel time measurement in one specialized device (vs THS788)
- Fine one-sigma single-shot timing accuracy (vs THS788)
- High event acquisition rate and extended result range (vs THS788)
Notes de conception
Treat the 13 ps TDC resolution and 200 MHz event rate as a signal-integrity requirement rather than an isolated timing specification. Route LVDS-compatible inputs with controlled impedance, source termination, matched trace lengths where timing alignment matters, and short return paths. Verify the complete input chain because reflections, attenuation, skew, and connector or fixture delay can degrade the useful system accuracy even when the THS788PFD itself is operating within specification.
Provide the external 200 MHz controller clock with low jitter and route it as a controlled clock network. Clock distribution topology, loading, isolation, and return-path continuity directly affect the reported time-to-digital result. Use the manufacturer’s recommended power-supply and decoupling arrangement from the THS788 datasheet and avoid sharing high-current return paths with sensitive timing signals. Clock and power sequencing should be validated across startup, shutdown, and temperature transitions.
Do not interpret the 8 ps single-shot accuracy or 13 ps resolution as a guarantee of equivalent end-to-end accuracy. Include reference-clock jitter, trigger-source jitter, probe and cable delay, input threshold behavior, software latency, calibration error, and temperature drift in the uncertainty analysis. For repeated measurements, characterize the distribution rather than relying on a single numerical result, particularly when event timing varies between acquisition shots.
Informations de conformité
The supplied verified excerpts do not contain explicit compliance declarations for THS788PFD. Consult the current Texas Instruments product page and material declaration documents before making environmental or automotive qualification claims.
