ADS821U - 10-Bit 40-MSPS ADC | Texas Instruments | Signal Capture
Référence : ADS821U ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $0 | $0,00 |
| 10 | $0 | $0,00 |
| 100 | $0 | $0,00 |
| 500 | $0 | $0,00 |
| 1 000 | $0 | $0,00 |
ADS821U Présentation
An ADC is a data-acquisition IC that samples an analog voltage and converts it into a digital code for processing by a microcontroller, DSP, FPGA, or test system. The ADS821U belongs to the pipeline ADC family, with its resolution, conversion rate, input architecture, reference, and acquisition circuitry defining its role within a broader analog-to-digital conversion and signal-processing hierarchy.
The converter's principal features are 40 MSPS operation, 10-bit resolution, 58 dB SNR, and 9.3-bit ENOB. The no-missing-codes feature supports deterministic output behavior, while the internal track-and-hold circuit simplifies front-end design. The verified product information also identifies a 380 mW low-power figure and supports SOIC-28 and SSOP-28 family packaging, with ADS821U specifically supplied in the 28-pin SOIC package.
Technically, the ADS821U is designed for single-ended or differential input acquisition. An internal reference and internal track-and-hold function reduce the number of external support blocks required in a conventional measurement chain. However, signal bandwidth, input range, timing, reference behavior, and electrical limits must be confirmed from the manufacturer datasheet before finalizing analog front-end and clock design.
Typical uses include communications and signal-analysis equipment, industrial measurement systems, test and measurement instruments, and embedded control or processing platforms that need a 40-MSPS conversion rate. The 10-bit code width is appropriate where the required information bandwidth is greater than the precision demanded from every individual sample.
A key design consideration is that the ADC does not replace the surrounding analog system. Input scaling, source impedance, anti-alias filtering, clock jitter, grounding, decoupling, and digital-interface timing determine practical performance. Confirm the pinout and pin functions in the official datasheet before layout or replacement work.
This page combines verified manufacturer and distributor information with application guidance, practical design notes, and explicitly qualified replacement considerations. Unverified prices, complete pin functions, and unconfirmed cross-brand drop-in equivalents are not inferred.
Alternatives de remplacement direct pour ADS821U — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
ADS821U-1
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ADS821U Valeurs maximales et caractéristiques électriques
| Converter Type | Pipelined analog-to-digital converter |
| Résolution | 10 bit |
| Fréquence d'échantillonnage | 40 MSPS |
| Input Configuration | 1 input; single-ended or differential |
| Signal-to-Noise Ratio | 58 dB |
| Effective Number of Bits | 9.3 bit |
| Power Consumption | 380 mW |
| Internal Reference | Internal |
| Track-and-Hold | Internal |
| Missing Code Behavior | No missing codes |
| Input Voltage | 1.25 V |
| Boîtier | SOIC-28 (DW) |
| Nombre de broches | 28 pin |
| Type de montage | Surface mount |
| Température de fonctionnement | -40 C to +85 C |
| Screening Level | Industrial |
| Architecture | Monolithic |
Guide de configuration des broches du ADS821U soic-28 (dw)
Configuration des broches du ADS821U (boîtier soic-28 (dw)). Ce composant analogique comporte des broches d'entrée, de sortie et d'alimentation. Consultez la fiche technique du fabricant pour les configurations des broches d'annulation d'offset, de compensation et d'activation. Idéal pour le conditionnement de signaux et les circuits amplificateurs.
Aucune donnée de brochage détaillée disponible pour ADS821U.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
ADS821U convient pour 6 applications: Communications Signal Capture, Test and Measurement Instrumentation, Industrial Measurement Systems, Waveform Data Acquisition, Embedded Control and Monitoring, Sensor Signal Digitization.
Communications Signal Capture
The ADS821U fits communications signal capture when the system needs 40-MSPS sampling and a 10-bit digital result. Its single-ended or differential input support lets the analog front end match the source, while the internal track-and-hold helps synchronize acquisition. The 58 dB SNR figure is the verified family-level metric; engineers should still verify bandwidth, input range, clocking, and output timing from the datasheet before setting the communications bandwidth.
Recommandé
Test and Measurement Instrumentation
ADS821U is appropriate for measurement front ends that sample waveforms at up to 40 MSPS and require a 10-bit code width. The internal reference and internal track-and-hold reduce support-circuit complexity, while the 28-pin SOIC package supports conventional surface-mount assembly. Use the converter when 9.3-bit ENOB and 58 dB SNR align with the instrument's dynamic-range requirement; for higher precision, select an ADC with a verified higher resolution instead.
Recommandé
Industrial Measurement Systems
The ADS821U can serve as the acquisition element in an industrial measurement system that needs real-time sampling of rapidly changing analog conditions. Its 40-MSPS throughput supports dense time-domain data, and the 10-bit resolution provides 1,024 digital code levels for digital transfer. The industrial screening level and -40 C to +85 C temperature specification are verified, but the system designer must still account for sensor excitation, isolation, grounding, and safety requirements.
Recommandé
Waveform Data Acquisition
ADS821U is well suited to waveform acquisition when the required record rate is no greater than 40 MSPS and 10-bit resolution is sufficient. The internal track-and-hold and reference support a compact acquisition chain, while the SOIC-28 package is practical for conventional PCB assembly. Designers should pair the ADC with anti-alias filtering, a low-jitter clock, adequate analog drive, and a digital processor that supports the converter's verified output interface.
Recommandé
Embedded Control and Monitoring
ADS821U can be used in embedded monitoring systems that need faster sampling than a general-purpose low-speed ADC. The 10-bit result can be transferred to a microcontroller or FPGA, while the single-ended or differential input selection supports different sensor-interface architectures. The design should validate acquisition timing, output coding, and supply sequencing against the datasheet, especially when the monitored signal bandwidth approaches the converter's sampling capability.
Recommandé
Sensor Signal Digitization
ADS821U is applicable when a sensor signal must be digitized rapidly enough to capture transients or waveform detail. Its 40-MSPS sampling rate and 10-bit resolution can be matched to medium-bandwidth sensor outputs, while the internal track-and-hold helps isolate the sampling instant. For sensor nodes, engineers must design input protection, biasing, filtering, and grounding around the actual sensor impedance; the verified 1.25 V input figure should not be treated as a complete front-end specification without datasheet context.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour ADS821U — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | ADS821U-1 |
|---|---|---|
| Package | SOIC-28 (DW) | SOIC-28 (DW) |
| Brand | Texas Instruments | Texas Instruments |
Principaux différenciateurs
- 40-MSPS conversion rate (vs ADS821U-1)
- 10-bit resolution with 9.3-bit ENOB (vs ADS821U-1)
- Integrated reference and track-and-hold (vs ADS821U-1)
Notes de conception
Keep the analog input path short and controlled. Place the ADC input pins and their associated input network according to the manufacturer layout guidance, use a low-impedance source where required, and minimize trace length between the driver, anti-alias filter, and ADC. A 40-MSPS converter can respond to high-frequency noise and timing errors even though its nominal output is only 10 bits.
Build the supply and decoupling network around the verified 380 mW device figure, while checking the datasheet for the exact operating supply and current conditions. Place required bypass capacitors close to the relevant supply pins, provide a low-impedance return path, and keep switching-converter noise away from sensitive analog traces. Estimated board power should include the ADC, reference, driver, interface, and support circuitry rather than the ADC value alone.
Do not treat a functional-equivalent ADC as a drop-in replacement without checking all 28 pins and the package drawing. Verify input range, reference behavior, clock polarity and timing, output coding, power sequencing, and thermal limits against the official datasheet. The supplied data identifies ADS821U as SOIC-28, but it does not provide the complete pin functions needed to certify an alternate part.
Informations de conformité
The supplied verified data identifies industrial screening but does not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. These fields remain unknown rather than inferred.
