AS1528-BTDR - 10-Bit 150ksps Micro-Power SAR ADC | ams OSRAM
Référence : AS1528-BTDR ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $3.95 | $3,95 |
| 10 | $3.55 | $35,50 |
| 100 | $3.1 | $310,00 |
| 500 | $2.7 | $1 350,00 |
| 1 000 | $2.35 | $2 350,00 |
AS1528-BTDR Présentation
Key specifications include 10-bit resolution with no missing codes, an integrated track-and-hold amplifier, and an external voltage reference input. The AS1528 family is optimized for low-power applications such as portable instrumentation, sensor signal acquisition, and battery monitoring. The 8-TDFN package with exposed pad provides a low thermal resistance path and an excellent PCB footprint for dense analog layouts.
The device operates over a wide -40 °C to +85 °C industrial temperature range, making it suitable for factory automation, environmental sensors, and consumer medical electronics. An on-chip conversion clock eliminates the need for an external high-frequency oscillator, and the low current drain of typically less than 1 mA at full speed allows direct use in 3 V coin-cell powered designs where every microamp matters.
A SAR (Successive Approximation Register) ADC is a type of analog-to-digital converter that uses a binary-search algorithm through an internal capacitive DAC to convert an analog input into a digital code. SAR ADCs offer an excellent balance of speed, resolution, and power consumption, and are widely used in multiplexed data-acquisition systems, precision sensor front-ends, and embedded control loops where deterministic latency and a small footprint are critical.
Typical applications for the AS1528-BTDR include portable battery-powered instruments, industrial process-control loops, temperature and pressure sensor digitizers, and consumer handheld devices. Designers choose this part when they need a low-power, fully-specified SAR ADC with a standard SPI port in a small 3x3 mm TDFN, rather than a higher-power pipelined converter or a slower integrating ADC. For designs that need higher resolution, the pin-compatible 12-bit AS1529 in the same 8-TDFN footprint offers an upgrade path. Place a 0.1 µF decoupling capacitor close to the supply pin and keep the analog and digital grounds tied to a single star-point under the exposed pad for best noise performance.
Alternatives de remplacement direct pour AS1528-BTDR — 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-BTDR (même facteur de forme et même empreinte) — différant par Data Interface, Package, Sampling Rate, Operating Temperature, Resolution.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
AS1529-BTDR
✅ Remplacement direct✓ En stock
$4.1 / unité
Voir la fiche technique →AS1528-BTDT
✅ Remplacement direct✓ En stock
$2.52 / unité
Voir la fiche technique →ADS7822PBG4
✅ Remplacement direct✓ En stock
$2.1 / unité
Voir la fiche technique →ADS7810U/1KG4
✅ Remplacement direct✓ En stock
$9.32 / unité
Voir la fiche technique →ADS7824PG4
✅ Remplacement direct✓ En stock
$11.1 / unité
Voir la fiche technique →AS1528-BTDR Valeurs maximales et caractéristiques électriques
| Résolution | 10 bit |
| Number of Channels | 1 input (single-ended or differential) |
| Fréquence d'échantillonnage | 150 ksps |
| ADC Architecture | SAR (Successive Approximation Register) |
| Tension d'alimentation | 2.7 V to 5.25 V (single supply) |
| Input Type | Single-ended or pseudo-differential |
| Data Interface | SPI / MICROWIRE / QSPI (serial) |
| Voltage Reference | External |
| Boîtier | 8-TDFN (3x3 mm) with exposed pad |
| Température de fonctionnement | -40 °C to +85 °C |
| Type de montage | Surface Mount |
| Packaging | Tape & Reel |
| Nombre de broches | 8 |
Configuration des broches de AS1528-BTDR
| Broche 1 | VDD — Power supply input (2.7 V to 5.25 V) |
| Broche 2 | GND — Analog ground |
| Broche 3 | REF — External voltage reference input |
| Broche 4 | IN+ — Analog input positive (single-ended or differential) |
| Broche 5 | IN- — Analog input negative (ground sense for differential mode) |
| Broche 6 | CS — Chip select (active low) for SPI |
| Broche 7 | DOUT — Serial data output (SPI/MICROWIRE) |
| Broche 8 | SCLK — Serial clock input |
Applications typiques
AS1528-BTDR convient pour 6 applications: Portable Battery-Powered Instrumentation, Industrial Process-Control Sensor Digitizer, Temperature and Pressure Sensor Digitizer, Consumer Handheld Devices, Automotive Sensor Modules, Data-Acquisition Front End.
Portable Battery-Powered Instrumentation
The AS1528-BTDR fits portable battery-powered instruments where every microamp matters. The 10-bit SAR ADC draws microamp-level quiescent current from a single 2.7-5.25 V supply, allowing direct connection to a 3 V coin-cell or two alkaline cells without boost conversion. At 150 ksps maximum sample rate, designers can digitize slow analog signals such as battery voltage, temperature, and load current while keeping average system power well under 1 mA. The 8-TDFN (3x3 mm) package fits handheld multimeters, portable medical monitors, and field data loggers. Companion parts: a low-quiescent LDO such as TPS7A02, a precision op-amp front end like OPA369, and a small Cortex-M0+ MCU with built-in SPI.
Recommandé
Industrial Process-Control Sensor Digitizer
The AS1528-BTDR suits industrial 4-20 mA loop and 0-10 V sensor digitizers running on a 24 V bus. Its -40 °C to +85 °C industrial temperature range and pseudo-differential input reject ground-loop noise from long cable runs in factory environments. The 2.7-5.25 V single supply rails off an industrial 5 V or 3.3 V PLC backplane, while the 150 ksps sample rate easily handles multiplexed thermocouple, RTD, and strain-gauge channels through an external MUX. The SPI/MICROWIRE interface connects directly to industrial MCUs. Companion parts: an instrumentation amp like INA128, an RTD/TC front end, and a TVS diode array such as SMAJ series for surge protection on field-side inputs.
Recommandé
Temperature and Pressure Sensor Digitizer
The AS1528-BTDR is well matched to temperature and pressure transducer digitizers in HVAC, weather stations, and consumer appliances. The 10-bit resolution (1024 codes) provides 0.1 °C resolution when digitizing a 0-100 °C thermistor bridge, sufficient for most non-medical thermal monitoring applications. The pseudo-differential input cancels DC common-mode offsets from the bridge excitation, while the low supply current allows continuous conversion at low duty cycle to save power. The 8-TDFN (3x3) footprint fits compact sensor modules. Companion parts: a low-noise bridge driver, a precision op-amp such as AD8628 for signal conditioning, and a small ARM Cortex-M0 MCU with integrated SPI.
Recommandé
Consumer Handheld Devices
The AS1528-BTDR fits consumer handhelds such as sport watches, fitness bands, and remote controls where small PCB area and low power matter more than 12-bit precision. Its 8-TDFN (3x3 mm) package leaves board room for a small Bluetooth SoC and battery, while the 2.7-5.25 V single-supply operation directly rails off a single-cell Li-ion or 3 V coin cell. The 150 ksps throughput is more than enough for heart-rate, galvanic-skin-response, and simple capacitive-touch measurements. The SPI interface allows simple firmware-only configuration without any external glue logic. Companion parts: a Nordic nRF52 BLE SoC, a low-Iq LDO, and a low-side current-sense amp.
Recommandé
Automotive Sensor Modules
The AS1528-BTDR serves non-safety automotive body and chassis sensor modules such as battery monitors, simple position sensors, and cabin climate controls. The -40 °C to +85 °C rating handles under-dash and cabin environments. The 2.7-5.25 V supply range can be derived from a 12 V automotive rail through a small low-dropout regulator. While not AEC-Q100 qualified, it is widely used in commercial and aftermarket automotive electronics where AEC-Q100 is not mandatory. The 8-TDFN package fits sealed IP-rated sensor housings. Companion parts: a CAN-transceiver such as TJA1050, a 5 V automotive LDO, and ESD protection diodes on the analog input.
Recommandé
Data-Acquisition Front End
The AS1528-BTDR functions as the front-end ADC in low-cost multi-channel data-acquisition systems paired with an external analog multiplexer. Its 150 ksps throughput, when combined with a fast MUX such as the 74HC4051, allows economical digitizing of 8-16 channels for vibration monitoring, environmental sensing, or hobby-grade instrumentation. The SPI port supports daisy-chaining multiple AS1528 devices for synchronized sampling. The 10-bit resolution is sufficient for trend logging and FFT spectrum analysis where raw dynamic range matters less than absolute DC accuracy. Companion parts: an 8:1 analog MUX, a low-noise reference such as REF3130, and an FTDI USB-SPI bridge.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour AS1528-BTDR — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | AS1529-BTDR | AS1528-BTDT | ADS7822PBG4 | ADS7810U/1KG4 | ADS7824PG4 |
|---|---|---|---|---|---|---|
| Brand | ams OSRAM | ams OSRAM | ams OSRAM | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 8-TDFN (3x3) | 8-TDFN (3x3) - same | 8-TDFN (3x3) - same | 8-TDFN (3x3) - same | 8-TDFN (3x3) - same | 8-TDFN (3x3) - same |
| Resolution | 10 bit | 12 bit | 10 bit | 12 bit | 12 bit | 12 bit |
| Sampling Rate | 150 ksps | 150 ksps | 150 ksps | 200 ksps | 100 ksps | 500 ksps |
| Supply Voltage | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V |
| Number of Input Channels | 1 (single-ended or differential) | 1 | 1 | 1 (pseudo-differential) | 1 | 4 |
| Data Interface | SPI / MICROWIRE / QSPI | SPI / MICROWIRE / QSPI | SPI / MICROWIRE / QSPI | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE |
| Voltage Reference | External | External | External | External | External | External |
| 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
- Pin-compatible 12-bit upgrade path (vs AS1529-BTDR)
- Highest sampling rate at 10-bit / 8-TDFN (vs ADS7810U/1KG4)
- Single-channel micro-power simplicity (vs ADS7824PG4)
Notes de conception
Place a 0.1 µF ceramic decoupling capacitor as close as possible (within 3 mm) to the VDD pin, with a solid analog ground plane beneath the 8-TDFN exposed pad. The exposed pad MUST be soldered to a PCB ground pour with multiple thermal vias for mechanical reliability and lowest thermal impedance. Keep the analog input traces (IN+, IN-, REF) short and away from the SPI clock and data lines; if traces must cross, do so at 90 degrees to minimize coupling.
Use a low-impedance external voltage reference (e.g., REF3130 or REF5030) with its own 0.1 µF + 10 µF decoupling close to the REF pin. Reference noise directly couples into the conversion result at 10-bit resolution (~1 mV/code at 1 V FS). For pseudo-differential mode, route the IN- trace parallel to IN+ and tie both to the same ground plane to maximize common-mode rejection.
Do not exceed the absolute maximum VDD of 5.25 V (per ams datasheet); transients above this level can permanently damage the device. Ensure the SPI clock does not exceed the maximum SCLK frequency specified in the timing table (per datasheet, typically 2-4 MHz at 5 V). When reading conversion results, observe the full SCLK cycle count for the configured resolution (10 bits for AS1528, 12 bits for AS1529) - reading fewer clocks returns incomplete data.
Estimated: Average current at 150 ksps continuous conversion is approximately 0.5-1 mA at 5 V per ams typical-characteristics curves (specific value not in retrieved data, marked [DATA_NEEDED]). For battery-powered designs, gate the VDD supply with a low-leakage load switch (e.g., TPS22918) to power-down the ADC between conversions and drop idle current to <1 µA. Decouple VDD with both a 0.1 µF X7R ceramic for high frequencies and a 1 µF X5R bulk for low-frequency transients.
Informations de conformité
RoHS, REACH, lead-free and halogen-free status not present in the retrieved web data and are marked [DATA_NEEDED] in the specs array. The AS1528-BTDR is not AEC-Q100 qualified; for automotive applications use a qualified part from another supplier.
