AS1526-BSOU - 10-Bit 73ksps SAR ADC, Single Supply | ams OSRAM
Référence : AS1526-BSOU ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $4.12 | $4,12 |
| 10 | $3.78 | $37,80 |
| 100 | $3.31 | $331,00 |
| 500 | $2.85 | $1 425,00 |
| 1 000 | $2.42 | $2 420,00 |
AS1526-BSOU Présentation
What is an SAR ADC? A successive-approximation-register analog-to-digital converter is a precision data-acquisition block that converts a sampled analog input to a digital code using a binary-search algorithm against a precision reference. SAR ADCs occupy the middle of the converter hierarchy: they sit between flash ADCs (fastest, highest power) and delta-sigma ADCs (highest resolution, lowest speed), delivering 8-18 bits of resolution at 100ksps to 1Msps with low latency and very low power consumption - making them the default choice for sensor signal chains, instrumentation, and embedded data acquisition.
Key features of the AS1526 include 73ksps throughput, true-differential analog input architecture (single-ended input on this variant), track-and-hold with 20MHz input bandwidth, low power dissipation of approximately 471mW active, and a 4µA shutdown mode. The internal 2.5V reference can be enabled or disabled via the SHDN pin: pulled high enables internal reference; floating disables it for an external reference connection. Supply current scales linearly with sample rate, supporting micropower applications where the converter idles between conversions.
Typical applications include portable instrumentation, data loggers, battery monitoring systems, pen digitizers, isolated sensor front-ends, and 4-20mA loop-powered measurement. The wide supply range and integrated reference minimize external component count for cost-sensitive designs.
When designing with this device, place the input bypass capacitor close to the supply pin and use a low-impedance source for the analog input. Verify reference decoupling if the internal 2.5V source is enabled. This page synthesizes distributor pricing, drop-in alternatives, and pin-level design notes not consolidated on the manufacturer datasheet.
Alternatives de remplacement direct pour AS1526-BSOU — 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 AS1526-BSOU (même facteur de forme et même empreinte) — différant par Package, RoHS Status, Architecture, Resolution, Analog Input Range.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
AS1526-BSOT
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
AS1527-BSOU
✅ Remplacement direct✓ En stock
$2.18 / unité
Voir la fiche technique →AS1526-BSOU-Z
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ADC101S021CIMFX
✅ Remplacement direct✓ En stock
$1.4 / unité
Voir la fiche technique →ADS7817UBG4
✅ Remplacement direct✓ En stock
$7.77 / unité
Voir la fiche technique →AS1526-BSOU Valeurs maximales et caractéristiques électriques
| Number of Bits | 10 |
| Fréquence d'échantillonnage | 73 ksps |
| Number of Inputs | 1 |
| Converter Type | SAR (Successive Approximation) |
| Input Type | Single-Ended |
| Data Interface | SPI, MICROWIRE, QSPI (Serial) |
| Supply Voltage Range | 2.7 V to 5.25 V (single supply) |
| Internal Reference | 2.5 V (selectable via SHDN pin) |
| External Reference Support | Yes (SHDN floating) |
| Courant d'arrêt | 4 µA maximum |
| Température de fonctionnement | -40 °C to +85 °C |
| Boîtier | 8-SOIC (3.90 mm width, BSOU) |
| Type de montage | Surface Mount |
| Statut RoHS | Compliant |
| Lead-Free | Yes |
Configuration des broches de AS1526-BSOU
| Broche 1 | CS — Chip Select (active low, enables serial interface) |
| Broche 2 | SCLK — Serial Clock Input |
| Broche 3 | DOUT — Serial Data Output |
| Broche 4 | GND — Ground |
| Broche 5 | AIN — Analog Input (single-ended) |
| Broche 6 | REF — Reference I/O (internal 2.5V or external) |
| Broche 7 | SHDN — Shutdown / Reference Select (high = internal ref, float = external ref) |
| Broche 8 | VDD — Power Supply (+2.7V to +5.25V) |
Applications typiques
AS1526-BSOU convient pour 7 applications: Portable Data Loggers, Battery Monitoring Systems, Pen Digitizers and Touch Panels, Industrial Sensor Signal Chains, Isolated Sensor Acquisition, Medical Patient Monitoring, HVAC and Building Automation.
Portable Data Loggers
The AS1526-BSOU fits portable data-logger designs through its 73 ksps throughput, single +2.7V to +5.25V supply operation, and 4µA shutdown current that lets the ADC idle between samples. Battery life extends to multi-year runtime when conversions are duty-cycled. The integrated 2.5V reference eliminates a discrete reference IC, reducing BOM cost and PCB area. SHDN pin ties high for internal reference, lowering external component count to three bypass caps plus the analog input RC. Sample rate scales 1ksps to 73ksps for temperature, voltage, and pressure logging sensors feeding low-power microcontrollers.
Recommandé
Battery Monitoring Systems
The AS1526-BSOU works in battery-monitoring front-ends because its single +2.7V supply aligns directly with single-cell lithium battery rails. The SAR architecture provides instantaneous conversion with no pipeline latency, ideal for fault detection and pack-balancing control loops. The 10-bit resolution quantises a 4.2V Li-ion range into 4.1 mV steps, sufficient for state-of-charge tracking. Shutdown mode at 4µA maximum lets the cell rest between samples. Internal 2.5V reference tolerance remains stable across -40 °C to +85 °C for cold-start automotive battery diagnostics.
Recommandé
Pen Digitizers and Touch Panels
The AS1526-BSOU supports pen-digitizer and touch-panel signal acquisition through its 73 ksps sample rate and SPI/MICROWIRE-compatible interface that connects directly to embedded MCUs. SAR conversions deliver deterministic latency for real-time stylus position tracking. Single +3.3V supply compatibility aligns with mobile-system rails. The 8-SOIC footprint integrates alongside touchscreen controllers without consuming board area. Low power consumption preserves battery runtime in handheld pen-input devices, and the 4µA shutdown current enables sleep-mode power gating between active digitizing cycles.
Recommandé
Industrial Sensor Signal Chains
The AS1526-BSOU addresses industrial 4-20mA loop-powered and bridge-sensor front-ends with its single-ended input, integrated reference, and -40 °C to +85 °C industrial temperature range. SAR conversions produce no latency artefacts in process-control loops. The SOIC-8 package is easy to hand-prototype and rework in factory-floor instrumentation. With an external op-amp buffer, the ADC accepts 0-2.5V or 0-5V transducer outputs. SPI interface simplifies isolation-barrier routing when paired with digital isolators for high-voltage measurement safety.
Recommandé
Isolated Sensor Acquisition
The AS1526-BSOU suits isolated measurement modules where the serial SPI interface crosses an isolation barrier via a digital isolator or optocoupler. The serial-data architecture minimises the isolator channel count to three lines (CS, SCLK, DOUT), reducing isolation BOM cost. Single +5V supply and integrated reference simplify isolated-side power design. SAR latency supports real-time current and voltage monitoring in motor drives and solar inverters. The 8-SOIC package fits in compact isolated-DC-DC modules where board space is constrained.
Recommandé
Medical Patient Monitoring
The AS1526-BSOU supports low-bandwidth medical monitoring applications such as temperature, respiration, and weight measurement through its 10-bit resolution and 73 ksps throughput. Single-supply +3.3V operation aligns with battery-powered medical devices. The integrated 2.5V reference reduces BOM complexity for FDA-cleared instrument designs. Low 4µA shutdown current preserves battery runtime for portable patient monitors. Note that higher-resolution measurements such as ECG or pulse oximetry typically require 16-24 bit delta-sigma converters; AS1526-BSOU fits auxiliary monitoring channels only.
Recommandé
HVAC and Building Automation
The AS1526-BSOU integrates into HVAC sensor modules for temperature, humidity, and pressure monitoring through its SPI interface to low-cost MCUs. The 73 ksps rate supports multi-channel scanning when combined with an external analog multiplexer. Single-supply operation from a +5V or +3.3V rail simplifies power tree design. The integrated reference provides ratiometric measurements when paired with ratiometric sensors. Industrial temperature rating of -40 °C to +85 °C covers outdoor and rooftop HVAC installations without additional thermal conditioning.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour AS1526-BSOU — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | AS1526-BSOT | AS1527-BSOU | AS1526-BSOU-Z | ADC101S021CIMFX | ADS7817UB |
|---|---|---|---|---|---|---|
| Brand | ams OSRAM | ams OSRAM | ams OSRAM | ams OSRAM | Texas Instruments | Texas Instruments |
| Package | 8-SOIC (3.90 mm) | 8-SOIC (3.90 mm) - same | 8-SOIC (3.90 mm) - same | 8-SOIC (3.90 mm) - same | 8-SOIC (3.90 mm) - same | 8-SOIC (3.90 mm) - same |
| Resolution | 10 bit | 10 bit | 10 bit | 10 bit | 10 bit | 10 bit |
| Sampling Rate | 73 ksps | 73 ksps | 73 ksps | 73 ksps | 200 ksps | 200 ksps |
| Supply Voltage | +2.7V to +5.25V | +2.7V to +5.25V | +2.7V to +5.25V | +2.7V to +5.25V | +2.7V to +5.25V | +4.5V to +5.5V |
| Internal Reference | 2.5V (selectable) | 2.5V (selectable) | 2.5V (selectable) | 2.5V (selectable) | External only | External only |
| Input Type | Single-Ended | Single-Ended | Differential | Single-Ended | Single-Ended | Single-Ended |
| Operating Temperature | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C |
Principaux différenciateurs
- Selectable internal/external reference on a single pin (vs ADS7817UB)
- True low-power shutdown mode (vs ADC101S021CIMFX)
- Wide single-supply voltage range (vs ADS7817UB)
- Compact 8-SOIC footprint across variants (vs Multi-channel ADCs (ADS7824))
Notes de conception
Decouple VDD with a 10µF tantalum plus 0.1µF ceramic network placed within 5 mm of pin 8. The internal 2.5V reference needs a 1µF ceramic bypass on the REF pin (pin 6) when used in internal-reference mode. The shutdown pin (pin 7) toggles between idle (4µA max) and active modes; floating this pin disables the internal reference and allows external reference operation. Power-supply rejection is best when analog and digital grounds share a single star-point at the ADC GND pin.
Drive the analog input (pin 5) from a low-impedance source - op-amp buffer recommended for source resistance above 1 kΩ. The track-and-hold acquisition window requires the input settle within 1 LSB before SCLK toggles CS low. Keep digital traces (CS, SCLK, DOUT) routed away from the analog input and reference traces; a ground guard ring around the AIN pin reduces digital-coupling noise. Place the 0.1µF decoupling cap on VDD before any series ferrite beads to prevent digital noise injection into the analog supply.
Do not leave the SHDN pin unconnected in internal-reference mode - it must be tied high to enable the 2.5V reference. Floating the SHDN pin disables the reference, which will cause conversions to fail. The CS pin must return high between conversions to frame data correctly per SPI protocol. Ensure SCLK idles low for MICROWIRE compatibility. When using external reference, drive REF before CS falls to avoid reference-settling errors during the first conversion.
Use a 4-layer PCB stackup with a dedicated ground plane under the SOIC-8 footprint. Keep the analog input trace short and surrounded by ground pour on both sides. Avoid routing digital signals beneath the SOIC body. SOIC-8 land pattern follows JEDEC MO-012 with 1.27 mm pin pitch and 0.41 mm pad width; verify against your fab house's land-pattern library before final layout. Add a copper thermal pad connected to GND under the IC to improve thermal dissipation during continuous conversion.
Informations de conformité
RoHS and lead-free compliance per ams OSRAM product documentation. Not qualified to AEC-Q100; for automotive applications use an AEC-Q100-qualified ADC. Halogen-free status not explicitly stated in the verified data - marked unknown per Data Authenticity Rules.
