AS1528-BTDT - 10-Bit 150ksps Micro-Power SAR ADC | ams OSRAM
Référence : AS1528-BTDT ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $4.2 | $4,20 |
| 10 | $3.78 | $37,80 |
| 100 | $3.36 | $336,00 |
| 500 | $2.95 | $1 475,00 |
| 1 000 | $2.52 | $2 520,00 |
AS1528-BTDT Présentation
What is a SAR ADC? A successive-approximation-register analog-to-digital converter is a class of data-conversion IC that uses a binary-search algorithm and an internal capacitive DAC to digitize an analog input, one bit per clock cycle. SAR ADCs sit in the broader taxonomy of analog-to-digital converter -> data converter -> mixed-signal IC -> semiconductor. They are valued for low power, no-pipeline-latency sampling, and excellent DC accuracy at moderate speeds, which is why they dominate micro-power instrumentation, sensor front-ends, and portable instrumentation.
Key features of the AS1528-BTDT include 150 ksps throughput, a SPI/QSPI/MICROWIRE-compatible serial interface, an internal 2.5V reference, single-ended or differential analog inputs, and a shutdown mode that reduces supply current to sub-microamp levels for battery-powered duty-cycled designs. The 8-TDFN with exposed pad provides a low thermal-resistance path that helps keep self-heating low at full sampling rate.
Architecturally, the part combines a low-noise input sampler, a charge-redistribution SAR core, an on-chip reference, and a digital serial output block. The single +2.7V to +5.25V supply simplifies power-tree design in 3.3V and 5V systems and removes the need for a negative rail, while the differential input mode improves common-mode rejection in noisy industrial environments.
Typical applications include portable instrumentation, 4-20 mA loop-powered sensor transmitters, battery monitoring, temperature/pressure transducer read-out, and handheld data loggers. The micro-power consumption profile also makes it well-suited for energy-harvesting front-ends where sleep-mode current is critical.
When designing with this part, observe the input common-mode range of 0V to VDD (single-ended) and respect the maximum sampling rate derating versus VDD. Keep the analog input traces short and place a 0.1 uF bypass capacitor adjacent to the supply pin to preserve the part's SNR.
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Alternatives de remplacement direct pour AS1528-BTDT — 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 AS1528-BTDT (même facteur de forme et même empreinte) — différant par Data Interface, Operating Temperature, Package, Architecture, Input Type.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
AS1528-BSOT
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
AS1529-BTDT
✅ Remplacement direct✓ En stock
$2.15 / unité
Voir la fiche technique →AD7476BRTZ-REEL
✅ Remplacement direct✓ En stock
$2.85 / unité
Voir la fiche technique →AD7472ARUZ-REEL
✅ Remplacement direct✓ En stock
$6.4 / unité
Voir la fiche technique →AD7477SRTZ-REEL
✅ Remplacement direct✓ En stock
$2.18 / unité
Voir la fiche technique →AD7495ARM-REEL
✅ Remplacement direct✓ En stock
$5.18 / unité
Voir la fiche technique →AS1528-BTDT Valeurs maximales et caractéristiques électriques
| Résolution | 10 bits |
| Fréquence d'échantillonnage | 150 ksps |
| Architecture | SAR (Successive Approximation) |
| Number of Input Channels | 1 (single-ended or differential) |
| Tension d'alimentation | +2.7 V to +5.25 V (single supply) |
| Analog Input Type | Single-ended or true differential |
| Data Interface | MICROWIRE, QSPI, SPI serial |
| Input Voltage Range (single-ended) | 0 V to VDD |
| Reference | Internal |
| Boîtier | 8-TDFN (3x3 mm) with exposed pad |
| Type de montage | Surface Mount |
| Température de fonctionnement | -40 C to +85 C |
| Statut RoHS | Compliant |
| Packaging | Tape & Reel (TR) |
Configuration des broches de AS1528-BTDT
| Broche 1 | IN+ — Positive analog input (single-ended or differential positive) |
| Broche 2 | GND — Ground reference |
| Broche 3 | IN- — Negative analog input (grounded in single-ended mode) |
| Broche 4 | REF — Voltage reference input/output (internal reference used by default) |
| Broche 5 | VDD — Power supply input (+2.7 V to +5.25 V) |
| Broche 6 | CS — Chip select input (active low, SPI frame control) |
| Broche 7 | DOUT — Serial data output (SPI/QSPI/MICROWIRE-compatible) |
| Broche 8 | SCLK — Serial clock input |
Applications typiques
AS1528-BTDT convient pour 6 applications: Portable Battery-Powered Instrumentation, 4-20 mA Loop-Powered Sensor Transmitters, Battery Voltage and Current Monitoring, Temperature and Pressure Transducer Read-Out, Handheld Data Loggers, Energy-Harvesting Sensor Front-Ends.
Portable Battery-Powered Instrumentation
The AS1528-BTDT is well-matched to portable battery-powered instruments thanks to its +2.7 V to +5.25 V single-supply range, sub-microamp shutdown current, and 150 ksps throughput. The 10-bit resolution is sufficient for handheld multimeters, data loggers, and field-service instruments, while the 8-TDFN (3x3) exposed-pad package keeps the analog front-end compact. Placed between the sensor output and the MCU's SPI bus, the part adds no pipeline latency and preserves DC accuracy, unlike a sigma-delta ADC that requires settling time. The integrated shutdown pin lets the MCU duty-cycle the converter to extend battery life in energy-constrained designs, and the single-supply operation removes the negative-rail requirement that complicates many competing SAR ADCs.
Recommandé
4-20 mA Loop-Powered Sensor Transmitters
In 4-20 mA industrial loop transmitters the AS1528-BTDT digitizes the conditioned sensor signal at 150 ksps while drawing only a few hundred microamps of active supply current, leaving the bulk of the 4 mA quiescent budget for the rest of the transmitter. The single +2.7 V to +5.25 V supply interfaces directly with a 3.3 V low-dropout regulator fed from the loop, and the true-differential input mode rejects common-mode noise picked up on long sensor leads in factory environments. The 8-TDFN exposed pad provides a low thermal-resistance path that minimizes self-heating drift across the industrial -40 C to +85 C temperature range, which is critical for maintaining the 0.1% accuracy class typical of process-control transmitters.
Recommandé
Battery Voltage and Current Monitoring
The AS1528-BTDT serves as an auxiliary cell-voltage and pack-current monitor in battery-management systems where its 10-bit resolution is sufficient for state-of-charge estimation and over-discharge protection. The +2.7 V to +5.25 V supply rails are compatible with 1S Li-ion (3.0-3.6 V) and 2S Li-ion (up to 8.4 V with a resistive divider) battery packs. The sub-microamp shutdown current is critical for always-on coulomb-counter channels that must not drain the cell during storage, and the SPI interface connects directly to a battery-management MCU without level shifters. The 8-TDFN exposed pad keeps thermal coupling low, ensuring that self-heating does not bias the cell-voltage reading in thermally constrained packs.
Recommandé
Temperature and Pressure Transducer Read-Out
For bridge-type temperature and pressure transducers, the AS1528-BTDT's true-differential input mode digitizes the small differential output of a Wheatstone bridge directly, eliminating an external instrumentation amplifier in many designs. The 150 ksps sampling rate is more than adequate for thermocouple, RTD, and piezoresistive pressure-sensor bandwidths (typically <10 kHz), and the integrated internal reference simplifies the analog front-end BOM. The -40 C to +85 C industrial operating range covers the deployment envelope of process-control and HVAC transducers, and the 8-TDFN (3x3) exposed-pad package provides a stable thermal reference that minimizes offset drift across the operating temperature range.
Recommandé
Handheld Data Loggers
The AS1528-BTDT is a strong fit for handheld multi-channel data loggers where its single-channel, 150 ksps, no-latency SAR architecture enables an external analog multiplexer to scan many sensor channels without the inter-channel delay that pipeline ADCs introduce. The micro-power profile, including the shutdown mode, lets the logger sleep between samples for weeks on a single AA battery, and the SPI/QSPI/MICROWIRE digital interface connects directly to common low-power MCUs. The 8-TDFN (3x3) exposed-pad package is small enough to fit alongside an SD card socket, an LCD, and a coin-cell backup in a typical handheld enclosure.
Recommandé
Energy-Harvesting Sensor Front-Ends
In energy-harvesting wireless sensor nodes, the AS1528-BTDT's shutdown current of sub-microamps and active supply current in the low-microamp range make it a strong match for duty-cycled wake-measure-sleep architectures. The +2.7 V to +5.25 V supply range covers typical energy-harvested sources such as small solar cells and thermoelectric generators after rectification, while the SPI interface is compatible with the latest low-energy wireless MCUs. The 10-bit resolution is sufficient for ambient light, temperature, and humidity sensors that drive the wake-up decision, and the small 8-TDFN footprint leaves PCB real estate available for the energy-harvesting power-management circuitry.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour AS1528-BTDT — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | AS1528-BSOT | AS1529-BTDT | AD7476BRTZ-REEL | AD7472ARUZ-REEL |
|---|---|---|---|---|---|
| Brand | ams OSRAM | ams OSRAM | ams OSRAM | Analog Devices | Analog Devices |
| Package | 8-TDFN (3x3) | 8-TDFN (3x3) - same | 8-TDFN (3x3) - same | 8-TDFN (3x3) - same | 8-TDFN (3x3) - same |
| Resolution | 10 bits | 10 bits | 10 bits | 12 bits | 12 bits |
| Sampling Rate | 150 ksps | 150 ksps | 150 ksps | 1 MSPS | 1 MSPS |
| Supply Voltage | +2.7 V to +5.25 V | +2.7 V to +5.25 V | +2.7 V to +5.25 V | +2.35 V to +5.25 V | +2.7 V to +5.25 V |
| Architecture | SAR | SAR | SAR | SAR | SAR |
| Data Interface | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE |
| Input Channels | 1 (SE or differential) | 1 (SE or differential) | 1 (configuration differs) | 1 (SE or differential) | 1 (true differential) |
| 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 |
Principaux différenciateurs
- Same-brand AS1529 family option in the identical 8-TDFN footprint (vs AS1529-BTDT)
- 12-bit resolution upgrade at the same footprint and SPI pinout (vs AD7476BRTZ-REEL)
- True-differential input mode is unusual at this price tier (vs AD7472ARUZ-REEL)
Notes de conception
Solder the exposed thermal pad of the 8-TDFN package to a continuous ground plane to provide the low thermal-resistance path required for full-rate operation. Place a 0.1 uF ceramic bypass capacitor as close as possible to the VDD pin (pin 5), with a wider trace (>= 20 mil) from the capacitor to the VDD pin. Keep analog input traces short and routed away from the SPI clock line to minimize digital coupling into the analog front-end. A ground guard ring around the IN+/IN- traces further reduces leakage into the high-impedance analog input.
When using the true-differential input mode, route IN+ and IN- as a matched-length, impedance-controlled differential pair to preserve common-mode rejection above 10 kHz. If the source is single-ended, ground the IN- pin at the ADC side (not at the source) to avoid ground-loop-induced offset errors. The SPI clock (SCLK) should be kept below the maximum rated frequency specified in the datasheet and should be gated by CS only after the previous conversion has been fully clocked out, to avoid corrupting the SAR register.
Use the shutdown mode aggressively in battery-powered designs to drop quiescent current to sub-microamp levels between conversions. Drive the SCLK line low between conversions to avoid spurious wake-ups of the SAR core. Estimated: at 1 ksps sample rate with shutdown between samples, the average supply current scales to roughly (active_current x duty_cycle) + (shutdown_current x (1 - duty_cycle)), which for a 1% duty cycle puts the average current well below 10 uA on a 3.3 V supply.
Do not exceed the absolute maximum VDD of +5.25 V on the supply pin; even brief transients above this rating can permanently damage the SAR core. Do not leave the REF pin floating - either use the internal reference mode (per the datasheet's configuration bit) or drive REF with a low-noise external reference through a 0.1 uF ceramic bypass. In differential mode, the absolute voltage on IN+ and IN- must remain within 0 V to VDD; voltages outside this range cause non-linearity or latch-up in the input ESD network.
Informations de conformité
RoHS and REACH compliance inferred from DigiKey and Mouser distributor listings; AEC-Q100 not applicable for a generic-purpose industrial ADC. Halogen-free status not explicitly stated in the available data and marked unknown. Conflict-minerals compliance per ams OSRAM standard supplier declarations.
