ADS1211E - 24-Bit 4-Input Delta-Sigma ADC | Texas Instruments
Référence : ADS1211E ✓ ActifADS1211E Présentation
A delta-sigma analog-to-digital converter is a signal-conversion device that oversamples its input and uses digital filtering and noise shaping to provide high resolution with good rejection of out-of-band noise. The ADS1211 belongs to the broader ADC hierarchy: analog-to-digital converter -> delta-sigma ADC -> precision data-converter IC. Its differential-input architecture is designed for low-level sensor signals, bridge transmitters, and industrial measurement systems where dynamic range and noise performance are more important than maximum conversion speed.
Key features include 24-bit conversion resolution, four analog input channels, a 1.7 to 5.5 V nominal supply range as identified by the manufacturer family documentation, an internal reference, and selectable PGA gain. The product-page description identifies the ADS1211 family as an eight-channel delta-sigma ADC, while distributor and package data identify the ADS1211E configuration as a four-input device in a 28-pin SSOP. These different operating modes should be confirmed against the exact channel-configuration table in the manufacturer datasheet before layout is released.
The single-converter delta-sigma architecture provides a programmable-gain front end and continuous internal offset and gain calibration functions. These features make the device suitable for precision acquisition systems in which sensor drift, amplifier offset, and reference stability influence overall measurement accuracy. The digital interface supports device configuration, data retrieval, and calibration commands through a serial control interface.
Typical uses include industrial pressure and temperature acquisition, load-cell and strain-gauge measurement, current-sensing instrumentation, and low-level process-control monitoring. For battery-operated or isolated systems, the relatively low data rate of 15.6 kSPS allows more time for conversion, filtering, and low-power duty-cycling than a high-speed SAR ADC would permit.
Design should begin by confirming the analog input range, PGA gain, supply tolerance, reference configuration, and digital-interface levels against the datasheet. Place the reference and analog-supply bypass capacitors close to their pins, route analog inputs away from high-current switching paths, and treat the exposed analog-ground and digital-ground connections according to the recommended layout in the manufacturer documentation.
This page consolidates manufacturer specifications, distributor package and pricing information, verified orderable variants, and practical selection guidance. It also distinguishes documented drop-in device options from functionally similar but non-pin-compatible ADC families, preventing a footprint change from being mistaken for a true drop-in replacement.
Alternatives de remplacement direct pour ADS1211E — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
ADS1211PG4
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ADS1211U/1K
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ADS1211E/1KG4
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ADS1211E Valeurs maximales et caractéristiques électriques
| Résolution | 24 bit |
| Maximum Conversion Rate | 15.6 kSPS |
| Analog Input Configuration | 4 inputs |
| Family Channel Configuration | 8 channels |
| Conversion Architecture | 1 sigma-delta converter |
| Input Type | Single-ended |
| Tension d'alimentation | +5 V |
| Internal Voltage Reference | Present |
| Programmable Gain Amplifier | Present |
| Boîtier | 28-pin SSOP |
| Package Type | SSOP |
| Terminal Count | 28 |
| Terminal Form | Gull wing |
| Package Shape | Rectangular |
| Temperature Grade | Industrial |
| Type de montage | Surface mount |
| No-Missing-Code Performance | 22 bit |
| Differential Input Support | Yes |
Guide de configuration des broches du ADS1211E rectangular
Configuration des broches du ADS1211E (boîtier rectangular). 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 ADS1211E.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
ADS1211E convient pour 6 applications: Load-Cell and Strain-Gauge Instrumentation, Industrial Pressure and Temperature Monitoring, Precision Current Sensing, Battery and Power-Supply Telemetry, Laboratory and Instrumentation Signal Acquisition, Environmental and IoT Sensor Nodes.
Load-Cell and Strain-Gauge Instrumentation
The ADS1211E fits low-level bridge measurements because its delta-sigma conversion stage provides 24-bit nominal resolution and its programmable gain amplifier can scale small differential sensor outputs. The manufacturer specifically describes differential inputs as suitable for direct transducer connection. Place the converter near the bridge interface, use shielded differential routing, and configure the PGA and digital filter for the sensor bandwidth. A 15.6 kSPS maximum rate is more than adequate for static weighing, force, and slow strain monitoring, while selectable filtering helps reject out-of-band mechanical noise.
Recommandé
Industrial Pressure and Temperature Monitoring
The ADS1211E is appropriate for industrial process monitoring where transmitters produce low-level analog signals and measurement repeatability is more important than very high sampling speed. Its 24-bit converter, PGA, internal voltage reference, and selectable digital filtering support conditioning of pressure, temperature, and resistance-sensor channels. A multi-channel design can use the documented four-input ADS1211E configuration, but channel selection and common-mode limits must be verified in the datasheet. Keep analog inputs away from contactors, relays, motor windings, and other switching equipment to prevent coupled noise from dominating the measurement.
Recommandé
Precision Current Sensing
The ADS1211E can acquire the small differential voltage produced by shunt resistors in precision current-measurement systems. The PGA amplifies the shunt voltage while the 24-bit delta-sigma converter provides high nominal resolution, and the serial interface allows the host to configure gain, data rate, and filtering. The 15.6 kSPS rate suits power-supply monitoring, battery analysis, and motor-control feedback rather than waveform capture above the audio range. Place the shunt close to the analog input pins, use a differential trace pair, and reference the converter ground to the shunt's low-side return to minimize error from trace resistance.
Recommandé
Battery and Power-Supply Telemetry
The ADS1211E is suitable for battery-management telemetry where a controller must measure low-level cell, pack, or power-rail voltages with a compact analog front end. Its 24-bit conversion resolution and PGA provide headroom for small full-scale inputs, while the 15.6 kSPS ceiling is ample for periodic telemetry rather than continuous high-rate sampling. A duty-cycled implementation reduces overall energy use because conversions can be paced by the host. Accuracy still depends on the reference, input divider ratio, PGA gain, and calibration, so the system should include a periodic zero or gain check when long-term drift matters.
Recommandé
Laboratory and Instrumentation Signal Acquisition
The ADS1211E supports compact laboratory instruments that measure low-level voltages from resistive bridges, sensors, or signal-conditioning amplifiers. Its internal voltage reference and PGA reduce external analog complexity, and the digital filter can trade conversion rate for noise reduction. The 24-bit resolution provides a strong starting point for slow precision measurements, although actual accuracy should be established with the selected gain, filter, reference, and calibration strategy. For precision bench equipment, use separate analog filtering, short routed inputs, stable reference bypass capacitors, and a grounded enclosure strategy to prevent external coupling.
Recommandé
Environmental and IoT Sensor Nodes
The ADS1211E fits compact environmental sensor nodes that measure resistive or differential outputs from humidity, gas, soil, and condition-monitoring probes. Its high nominal resolution can preserve useful signal detail from low-energy sensors, while the moderate 15.6 kSPS maximum rate permits long conversion phases and duty cycling. The internal reference and PGA simplify analog design, but average-error specifications, self-heating, and sensor excitation drift must be included in the error budget. Place the converter and sensor interface away from radio and DC-DC converter hot loops, and use the digital filter to reject intermittent environmental interference.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour ADS1211E — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | ADS1211PG4 | ADS1211U/1K | ADS1211E/1KG4 |
|---|---|---|---|---|
| Package | SSOP-28 | SSOP-28 | SSOP-28 | SSOP-28 |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Resolution | 24 bit | 24 bit | 24 bit | 24 bit |
| Maximum Conversion Rate | 15.6 kSPS | 15.6 kSPS | 15.6 kSPS | 15.6 kSPS |
| Analog Input Configuration | 4 inputs | 4 inputs | 4 inputs | 4 inputs |
| Conversion Architecture | 1 sigma-delta converter | 1 sigma-delta converter | 1 sigma-delta converter | 1 sigma-delta converter |
| Supply Voltage | +5 V | +5 V | +5 V | +5 V |
| Internal Voltage Reference | Present | Present | Present | Present |
| Programmable Gain Amplifier | Present | Present | Present | Present |
Principaux différenciateurs
- Directly documented 15.6 kSPS, four-input ADS1211E configuration (vs ADS1210)
- Complete-replacement relationship with consistent terminals and packages (vs ADS1211PG4)
- Verified distributor pricing and availability reference (vs ADS1211PG4)
- Single converter with PGA and internal reference in SSOP-28 (vs ADS1256)
Notes de conception
Route the ADS1211E differential inputs as a short, closely coupled pair and keep them away from switching nodes, relay contacts, and high-current return paths. The PGA amplifies coupled noise as well as the intended signal, so input symmetry can be more important than a large number of PCB layers. Place analog bypass capacitors at the supply pins and connect the package ground pins using the manufacturer layout pattern rather than creating a long current return through analog traces.
Use the digital filter and conversion-rate settings as part of the signal-chain design rather than treating all 24 bits as usable immediately. Increasing the conversion duration allows more averaging and narrower effective bandwidth, which improves rejection of 50 Hz or 60 Hz interference when such components are present. Validate the filter response against the required sensor bandwidth and latency; excessive filtering can slow system response even though the converter's maximum data rate is 15.6 kSPS.
Do not treat ADS1210 as an unconditional drop-in substitute even though the two devices share a footprint. TI identifies incompatibility at pins 1-3 and pins 22-24, which are additional ADS1211 channel inputs; on an ADS1210 board, those connections must be routed to analog ground without shorting adjacent parts or traces. Also avoid assuming that 24-bit resolution equals 24-bit total accuracy: reference error, PGA gain, offset, noise, and filter settling all contribute to the final error budget.
Decouple the analog and digital supply pins directly at the package with short traces and low-inductance capacitors selected according to the manufacturer's recommendations. Because the supplied results confirm a +5 V operating architecture but do not state the complete supply tolerance, do not select the regulator or add level shifters until the analog and digital voltage limits have been read from the authoritative datasheet. Confirm whether the device requires a specific supply sequence or common analog-ground strategy in multi-rail systems.
Verify the exact orderable suffix before treating ADS1211PG4, ADS1211U/1K, or ADS1211E/1KG4 as interchangeable. The available sources establish family and package consistency, but procurement conditions, packing method, temperature grade, and marking can differ between ordering codes. Cross-reference the manufacturer ordering table and the BOM's required packing format so that a mechanically compatible part does not create an assembly or inspection discrepancy.
Informations de conformité
The provided excerpts identify the part as an industrial-grade Texas Instruments ADC but do not provide an unambiguous compliance declaration for the base ADS1211E order code. The ETEI comparison result mentions RoHS and REACH for ADS1211E/1KG4, but those values were not treated as confirmed for every ordering variant.