AS1539-BTST - 8-Channel 10-Bit I2C SAR ADC | ams OSRAM
Référence : AS1539-BTST ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $3.45 | $3,45 |
| 10 | $3.1 | $31,00 |
| 100 | $2.65 | $265,00 |
| 500 | $2.25 | $1 125,00 |
| 1 000 | $1.92 | $1 920,00 |
AS1539-BTST Présentation
A SAR ADC is a successive-approximation-register analog-to-digital converter that uses a binary-search algorithm against a precision DAC to digitize an analog input in N clock cycles for N bits of resolution. SAR ADCs sit in the broader hierarchy of: ADC -> data converter -> signal chain IC -> mixed-signal semiconductor. Compared with delta-sigma ADCs, SAR parts offer deterministic latency and lower power at modest resolutions, making them well suited to multiplexed low-frequency sensor acquisition rather than high-precision measurement.
Key features include 8 input channels with software-configurable unipolar input range, an internal +2.5V reference (with the option to overdrive with an external reference), single-supply operation from 2.7V to 5.5V, low supply current, an I2C-compatible 2-wire serial interface, and a TSSOP-16 footprint that fits space-constrained designs.
The architecture uses a capacitive charge-redistribution DAC with an internal clock and sample-and-hold. The reference defaults OFF at power-up and can be software-enabled; if the internal or external reference is repeatedly toggled, adequate settling time must be inserted between conversion cycles to preserve linearity, as called out in the manufacturer datasheet.
Typical applications include multi-channel sensor monitoring, battery-cell monitoring in portable equipment, industrial process controls, and consumer audio/system monitoring where 10-bit resolution is sufficient.
Design tip: add a 100 nF decoupling capacitor close to the supply pin and ensure the I2C SCL/SDA lines are pulled up to VDD with appropriate resistors for the chosen bus speed. Settling time after reference switching must be respected for INL/DNL.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the standalone manufacturer datasheet, with all data points last verified as of 2026-10-13.
Alternatives de remplacement direct pour AS1539-BTST — 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 AS1539-BTST (même facteur de forme et même empreinte) — différant par Package, Resolution, Input Type, Architecture, Number of Input Channels.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
AS1541-BTST
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
AS1538-BTST
✅ Remplacement direct✓ En stock
$4.05 / unité
Voir la fiche technique →AS1525-BTDR
✅ Remplacement direct ⚠️ Spécifications non vérifiées✓ En stock
$2.98 / unité
Voir la fiche technique →ADS1110A6IDBVR
✅ Remplacement direct ⚠️ Spécifications non vérifiées✓ En stock
$1.95 / unité
Voir la fiche technique →ADS1100A7IDBVRG4
✅ Remplacement direct ⚠️ Spécifications non vérifiées✓ En stock
$4.1 / unité
Voir la fiche technique →AS1539-BTST Valeurs maximales et caractéristiques électriques
| Résolution | 10 bit |
| Number of Input Channels | 8 (AS1539) / 4 (AS1541) |
| Fréquence d'échantillonnage | 50 ksps |
| Architecture | SAR (Successive Approximation Register) |
| Data Interface | I2C (2-wire, serial) |
| Input Type | Single-ended, unipolar |
| Number of ADCs | 1 |
| Sample-and-Hold | Integrated |
| Reference Type | Internal 2.5V (external reference input supported) |
| Supply Voltage (Analog/Digital) | 2.7 V to 5.5 V (single supply) |
| Boîtier | 16-TSSOP (0.173" / 4.40 mm width) |
| Type de montage | Surface Mount |
| Packaging | Tape & Reel (TR) |
| Statut RoHS | Compliant |
| Nombre de broches | 16 |
Configuration des broches de AS1539-BTST
| Broche 1 | AIN0 — Analog input channel 0 |
| Broche 2 | AIN1 — Analog input channel 1 |
| Broche 3 | AIN2 — Analog input channel 2 |
| Broche 4 | AIN3 — Analog input channel 3 |
| Broche 5 | GND — Ground |
| Broche 6 | AIN4 — Analog input channel 4 |
| Broche 7 | AIN5 — Analog input channel 5 |
| Broche 8 | AIN6 — Analog input channel 6 |
| Broche 9 | AIN7 — Analog input channel 7 |
| Broche 10 | REF — Reference voltage input/output (internal 2.5V) |
| Broche 11 | SDA — I2C serial data |
| Broche 12 | SCL — I2C serial clock |
| Broche 13 | VDD — Supply voltage (2.7V to 5.5V) |
| Broche 14 | NC — Not connected (per datasheet) |
| Broche 15 | NC — Not connected (per datasheet) |
| Broche 16 | NC — Not connected (per datasheet) |
Applications typiques
AS1539-BTST convient pour 6 applications: Multi-Cell Battery Monitoring, Industrial Sensor Monitoring, Portable Medical Devices, Consumer Audio System Monitoring, HVAC and Building Automation, IoT Sensor Hubs.
Multi-Cell Battery Monitoring
The AS1539-BTST's 8 single-ended input channels make it a strong fit for multi-cell battery monitoring in portable and backup-power systems. Each cell voltage is fed into one of AIN0-AIN7, and the on-chip multiplexer sequentially scans up to 8 cells through a single I2C bus, eliminating the per-cell ADC cost. The 10-bit resolution (1 LSB ~5 mV at 5V FSR) is adequate for state-of-charge estimation, and the 2.7V to 5.5V single-supply range matches 1S-4S Li-ion stacks directly. Designers should route cells in ascending order to AIN0-AIN7 and respect the reference settling time after enable for accurate readings.
Recommandé
Industrial Sensor Monitoring
The AS1539-BTST is well suited to industrial sensor front-ends where multiple analog transducers (temperature, pressure, flow, level) must be digitized and reported over an I2C bus to a host MCU. The 8 input channels allow one ADC per sub-system rather than one per sensor, the 50 ksps throughput handles slow process-control signals comfortably, and the 2.7V-5.5V supply range supports 3.3V and 5V industrial rails. The integrated 2.5V reference can be overridden by an external precision reference if the application requires tighter absolute accuracy for calibration.
Recommandé
Portable Medical Devices
The AS1539-BTST's low supply current, single 2.7V-5.5V operation, and compact 16-pin TSSOP footprint suit portable medical devices such as blood-pressure monitors, pulse oximeters, and handheld diagnostic tools. The 8 channels multiplex signals from multiple bio-sensors (SpO2, temperature, pressure) into a single I2C bus, simplifying the host MCU pinout. The 10-bit resolution is sufficient for trend and threshold-based monitoring, and the small TSSOP package leaves board space for the analog front-end and battery management circuitry.
Recommandé
Consumer Audio System Monitoring
The AS1539-BTST can be used in consumer audio and home-theater products to monitor supply rails, temperature, and user-interface potentiometers. The 8 channels digitize a mix of slow analog signals (volume, tone, supply voltage, board temperature via a thermistor) and the I2C interface connects directly to the audio DSP or main MCU without an extra serial bus. The 50 ksps rate is overkill for these signals but provides headroom for occasional fast events like peak-detect logging.
Recommandé
HVAC and Building Automation
The AS1539-BTST fits HVAC and building-automation control boards that aggregate many analog inputs (temperature sensors, humidity sensors, pressure transducers, fan-speed tachometers filtered to DC). Its 8 channels, single-supply operation, and I2C interface simplify the wiring back to the central building controller. The 10-bit resolution supports typical 1C temperature setpoint accuracy, and the TSSOP-16 footprint fits standard control-board panel space.
Recommandé
IoT Sensor Hubs
The AS1539-BTST is a strong match for IoT sensor hubs and edge nodes that aggregate multiple analog sensors before forwarding data over wireless. The 8-channel multiplexer and I2C bus reduce GPIO pressure on the wireless MCU, while the low supply current and wide 2.7V-5.5V range support battery-powered deployments. The 10-bit resolution is well-matched to threshold and event-detection use cases typical in IoT, where raw precision is less important than signal conditioning and reliability.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour AS1539-BTST — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | AS1541-BTST | AS1538-BTST | AS1525-BTDR | ADS1110A6IDBVR | ADS1100A7IDBVRG4 |
|---|---|---|---|---|---|---|
| Brand | ams OSRAM | ams OSRAM (same brand) | ams OSRAM (same brand) | ams OSRAM (same brand) | Texas Instruments (cross-brand) | Texas Instruments (cross-brand) |
| Package | 16-TSSOP | 16-TSSOP (same) | 16-TSSOP (same) | 16-TSSOP (same) | SOT-23-6 (different) | SOT-23-6 (different) |
| Resolution | 10 bit | 10 bit (same) | 12 bit (+20%) | 12 bit | 16 bit | 16 bit |
| Number of Input Channels | 8 | 4 (-50%) | 8 (same) | 8 | 1 | 1 |
| Architecture | SAR | SAR (same) | SAR | SAR | Delta-Sigma | Delta-Sigma |
| Data Interface | I2C | I2C (same) | I2C | I2C/SPI | I2C | I2C |
| Internal Reference | 2.5V (on) | 2.5V (same) | 2.5V | 2.5V | 2.048V (delta-sigma) | 2.048V (delta-sigma) |
| Supply Voltage | 2.7V to 5.5V | 2.7V to 5.5V (same) | 2.7V to 5.5V | 2.7V to 5.5V | 2.7V to 5.5V | 2.7V to 5.5V |
Principaux différenciateurs
- Integrated 2.5V reference with internal oscillator reduces BOM (vs ADS1100A7IDBVRG4)
- 8 single-ended channels in a TSSOP-16 (vs AS1541-BTST)
- SAR architecture for deterministic latency (vs ADS1110A6IDBVR)
Notes de conception
Place a 100 nF decoupling capacitor as close as possible to the VDD pin (pin 13) of the AS1539-BTST, with a low-ESR path to the GND pin (pin 5). The internal reference defaults OFF at power-up; if used, the REF pin (pin 10) requires the datasheet-specified bypass capacitor to limit reference noise. Reference settling time after enable or external-reference switching must be respected before starting a conversion cycle to avoid linearity errors.
Route the analog input traces (AIN0-AIN7) away from digital switching signals, particularly the I2C SCL/SDA lines and any high-current traces. Use a ground plane under the analog section to provide a low-impedance return and to reduce coupling. If unused input pins are left floating, tie them to a defined voltage (mid-scale or GND) to prevent injection of spurious charge into the multiplexer during channel switching.
The I2C SDA (pin 11) and SCL (pin 12) lines must be pulled up to VDD with resistors appropriate for the chosen bus speed (typically 4.7 kohm for 100 kHz, 2.2 kohm for 400 kHz). Series resistance or excessive capacitance can cause bus-edge violations; keep the bus capacitance below the I2C spec limit for reliable communication. For multi-slave buses, verify address selection pins (if present) and ensure no address collisions across the bus.
Do not toggle the internal/external reference on and off without inserting adequate settling time between conversion cycles, as noted in the manufacturer datasheet. Operating the device outside the 2.7V-5.5V supply range can damage the part and violates the absolute maximum ratings. Ensure analog inputs never exceed VDD or go below GND by more than the absolute-maximum spec, even during fault conditions, by adding input protection resistors or clamping diodes.
Informations de conformité
RoHS compliant per ams OSRAM product page. AEC-Q100 not applicable for this industrial/consumer ADC; consult ams OSRAM for automotive-grade variants if required.
