ADS8345NB - 16-Bit 8-Channel 100-kSPS ADC | Texas Instruments
Référence : ADS8345NB ✓ ActifADS8345NB Présentation
A sampling ADC is a mixed-signal integrated circuit that samples an analog voltage and converts it into a digital code. The ADS8345 belongs to the SAR ADC hierarchy, within analog-to-digital converters and data-converter ICs. Its multiplexed architecture lets one converter measure multiple sensors or signal channels through a synchronous serial interface, reducing component count in industrial controls, instrumentation, and test equipment.
Key features include 16-bit resolution, a maximum conversion rate of 100 kSPS, eight single-ended or four differential inputs, and a selectable reference range from 500 mV to VCC/2. The differential input range of ±VREF supports bipolar measurement without separate input conditioning. Shutdown mode reduces consumption when the acquisition system is idle, while typical power dissipation is 8 mW at 100 kSPS with a 5 V supply.
Internally, the converter uses a successive-approximation architecture and a synchronous serial interface for transferring conversion results. The ADS8345 accepts an external reference, allowing the system designer to establish the measurement scale and common-mode behavior for the analog front end. The 208 mil SSOP-20 package is intended for conventional surface-mount PCB assembly and provides a pin-compatible path with compatible Texas Instruments ADS834x devices.
Typical applications include data-acquisition systems, industrial process control, test and measurement equipment, battery-powered instrumentation, and multichannel sensor interfaces. The 100-kSPS throughput is appropriate for monitoring slowly changing process variables and general-purpose analog measurement rather than high-frequency waveform capture.
For a robust design, follow the manufacturer’s recommended reference, bypass-capacitor, and analog-ground layouts. The input source impedance and acquisition time must be checked together because the selected channel is connected to the internal sampling network for only part of each conversion cycle. Signal conditioning should limit voltage and current excursions to the ADC’s absolute-maximum ratings.
This product page consolidates the key electrical specifications, package information, pin-compatible alternatives, application guidance, and engineering notes needed to evaluate the ADS8345NB for a precision multichannel acquisition design.
Alternatives de remplacement direct pour ADS8345NB — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec ADS8345NB (même facteur de forme et même empreinte) — différant par Input Type, Typical Power Dissipation, Resolution, Architecture, Reference Voltage Range.
ADS8344N
✅ Remplacement directContactez-nous pour le prix
Voir la fiche technique →ADS7844N
✅ Remplacement directContactez-nous pour le prix
Voir la fiche technique →ADS8346
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ADS8347
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ADS8345N/1K
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ADS8345NB Valeurs maximales et caractéristiques électriques
| Résolution | 16 bit |
| Maximum Conversion Rate | 100 kSPS |
| Single-Ended Input Channels | 8 channels |
| Differential Input Channels | 4 channels |
| Architecture | Successive-approximation SAR |
| Supply Voltage Range | 2.7 V to 5 V |
| Signal-to-Noise and Distortion | 85 dB SINAD |
| Reference Voltage Range | 500 mV to VCC/2 |
| Differential Input Range | ±VREF |
| Typical Power Dissipation | 8 mW at 100 kSPS and 5 V supply |
| Type d'interface | Synchronous serial interface |
| Package Type | 20-pin SSOP, 208 mil |
| Package Pin Count | 20 pins |
| Type de montage | Surface mount |
| Reference Source | External reference |
| Power-Down Function | Available |
| Input Type | Unipolar single-ended or bipolar differential |
Guide de configuration des broches du ADS8345NB 20 pins
Configuration des broches du ADS8345NB (boîtier 20 pins). 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 ADS8345NB.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
ADS8345NB convient pour 6 applications: Multichannel Data Acquisition, Industrial Process Control, Test and Measurement Equipment, Battery-Powered Sensor Interfaces, Battery Monitoring and Protection, General-Purpose Embedded Measurement.
Multichannel Data Acquisition
The ADS8345NB fits multichannel data-acquisition systems that require accurate conversion of several sensor outputs without using one ADC per channel. Its multiplexer supports eight single-ended or four differential inputs, while 16-bit resolution provides 65,536 possible digital codes across the selected reference range. At up to 100 kSPS, the converter can continuously refresh a group of slowly varying measurements. Place the device behind suitable analog switches or buffers when the sources require channel isolation, scaling, or protection, and use the synchronous serial interface to transfer each conversion result to the controller.
Recommandé
Industrial Process Control
The ADS8345NB is suitable for industrial process-control loops that monitor pressure, temperature, position, or current sensors. Eight single-ended inputs reduce the analog-channel count, and differential operation supports four balanced channels with a ±VREF input range. Its 100-kSPS maximum rate provides more than enough throughput for typical process variables while its 16-bit resolution supports fine measurement granularity. At the system level, add overvoltage, surge, and overcurrent protection for field wiring, and isolate external circuitry when the converter is connected to hazardous or high-energy equipment.
Recommandé
Test and Measurement Equipment
The ADS8345NB can serve as the measurement front end in programmable instruments and automated test equipment. Its 100-kSPS conversion rate is appropriate for slowly changing voltages, calibration outputs, and general-purpose bench measurements, while the 20-pin SSOP package supports conventional surface-mount assembly. The external reference allows the instrument designer to establish a traceable measurement scale. Use buffered inputs and carefully controlled grounding when measuring low-level signals, because source impedance, reference noise, and digital coupling can otherwise limit the practical accuracy below the converter’s 16-bit resolution.
Recommandé
Battery-Powered Sensor Interfaces
The ADS8345NB is appropriate for portable and battery-powered sensor interfaces because it operates from 2.7 V to 5 V and includes a shutdown function. Its typical 8 mW dissipation at 100 kSPS with a 5 V supply provides a baseline for system-level power budgeting, although lower conversion rates can reduce average consumption. The device can monitor several low-bandwidth sensor channels through its multiplexer and wake the controller when conversion data is ready. Energy optimization should include disabling unused channels at the analog front end, shortening serial transactions, and placing the ADC into shutdown whenever continuous monitoring is unnecessary.
Recommandé
Battery Monitoring and Protection
The ADS8345NB can monitor multiple battery-cell or power-rail voltages in a battery-management system where 16-bit resolution and flexible single-ended or differential input selection are useful. The converter samples one selected input at a time, allowing a controller to sequence measurements without operating eight dedicated converters. Differential channels can reject common-mode voltage when cell taps share a shifting reference point. The analog inputs must remain within the device’s operating limits during charging and discharge, so include scaling, filtering, and overvoltage protection rather than connecting raw high-energy battery nodes directly.
Recommandé
General-Purpose Embedded Measurement
The ADS8345NB suits embedded controllers that acquire several analog quantities for diagnostics, configuration, or feedback control. Its synchronous serial interface supports compact connections to microcontrollers and digital signal processors, while the single 2.7 V to 5 V supply operation simplifies system integration. The 100-kSPS rate is particularly useful for supervisory measurements that do not require waveform-grade sampling. Designers should calculate the required acquisition time for the highest source impedance, allow the input to settle between channel selections, and use the manufacturer’s timing values to avoid sampling during the previous conversion’s acquisition interval.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour ADS8345NB — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | ADS8344N | ADS7844N | ADS8346 | ADS8347 | ADS8345N/1K |
|---|---|---|---|---|---|---|
| Package | SSOP-20 (208 mil) | SSOP-20 (208 mil) | SSOP-20 (208 mil) | SSOP-20 (208 mil) | SSOP-20 (208 mil) | SSOP-20 (208 mil) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
Principaux différenciateurs
- External-reference flexibility (vs ADS7844N)
- Full eight-channel single-ended capacity (vs ADS8346)
- Documented pin-compatible upgrade path (vs ADS8344N)
Notes de conception
Treat the analog input and reference nets as sensitive precision paths. Place the external reference and its bypass capacitor close to the corresponding pins, keep the input routes compact, and route serial clock, data, and chip-select traces away from the analog inputs. Connect analog return current to the quiet ground region and follow the manufacturer’s grounding topology. This separation reduces conversion-error coupling that could otherwise limit the usable resolution of the 16-bit converter.
Verify source impedance and acquisition time before using high-value precision resistors in the input path. The selected multiplexer channel must settle during the acquisition interval, so a theoretically valid input voltage can still produce an inaccurate result if the source cannot charge the internal sampling network quickly enough. Use the Texas Instruments acquisition-time table and include settling time in the channel-switching sequence; add a buffer when the sensor or divider cannot meet the required bandwidth.
Budget the converter around its stated 8 mW typical dissipation at 100 kSPS with a 5 V supply, then add supply-regulator loss, reference current, interface activity, and external analog circuitry. Place the required bypass capacitors at the supply and reference pins with short, direct return paths. Use shutdown between acquisition bursts when the average sampling rate is low, and confirm the wake and settling sequence before the first valid conversion.
Informations de conformité
The ADS8345 is a data-converter IC rather than an automotive-qualified device; no AEC-Q100 qualification is indicated for ADS8345NB.
