AS1532-T - 12-bit 4-ch 400ksps SAR ADC | ams OSRAM
Référence : AS1532-T ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $5.42 | $5,42 |
| 10 | $4.88 | $48,80 |
| 100 | $4.12 | $412,00 |
| 500 | $3.45 | $1 725,00 |
| 1 000 | $2.89 | $2 890,00 |
AS1532-T Présentation
A SAR ADC is a type of analog-to-digital converter that uses an iterative binary-search algorithm against an internal precision DAC, sampling the input on each clock cycle and producing a stable, low-latency conversion result in N clock cycles for an N-bit output. SAR ADCs sit in the broader hierarchy of data converters (ADC -> ADC sub-family -> data converter -> signal chain IC) and are preferred over delta-sigma or pipeline ADCs when low-latency, deterministic sampling, and excellent DC linearity are required at moderate sample rates.
The AS1532 family combines four single-ended or two differential input channels with an SPI/QSPI/MICROWIRE-compatible serial interface, low power consumption, and superior AC characteristics for instrumentation-class acquisition. Key features include four software-configurable input channels, an integrated 4.096V reference option, single-supply operation from 2.7V to 5.5V, and a low power-dissipation profile that scales with sample rate, making it suitable for both always-on sensor front ends and multiplexed measurement systems.
The converter uses a charge-redistribution SAR architecture with an internal clock and a sample-and-hold front end, enabling true 12-bit no-missing-code performance. Built-in input multiplexers allow sequential scanning of up to four single-ended sources without external switching, reducing BOM count and PCB area in multi-sensor applications such as battery-stack monitors and transducer bridges.
Typical applications include portable and battery-powered data acquisition, multi-channel process-control front ends, transducer/bridge sensor readout (load cells, strain gauges, thermocouples), industrial instrumentation with 4-20mA loop digitization, portable medical monitors, and embedded system analog front ends. The wide supply range simplifies integration with both 3.3V microcontrollers and 5V legacy analog chains.
When designing with this ADC, ensure the analog input pins are properly buffered with low-impedance op-amps driving the sample capacitor at high source impedance to avoid gain error. Decouple AVDD and DVDD independently with 0.1uF ceramic capacitors placed within 5 mm of the supply pins, and provide a clean ground plane beneath the TSSOP thermal pad to minimize digital switching noise coupling into the analog front end.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes that complement the manufacturer datasheet. It is intended as a supplementary engineering resource for component selection and BOM validation.
Alternatives de remplacement direct pour AS1532-T — 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 AS1532-T (même facteur de forme et même empreinte) — différant par Number of Input Channels, Package, Sampling Rate, Resolution, RoHS Status.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
AS1533-T
✅ Remplacement direct✓ En stock
$2.45 / unité
Voir la fiche technique →AD7995YRMZ-0
✅ Remplacement direct✓ En stock
$2.98 / unité
Voir la fiche technique →AD7994BRU-0REEL
✅ Remplacement direct✓ En stock
$4.68 / unité
Voir la fiche technique →ADS7822PG4
✅ Remplacement direct✓ En stock
$3.2 / unité
Voir la fiche technique →ADS7824PG4
✅ Remplacement direct✓ En stock
$11.1 / unité
Voir la fiche technique →AS1532-T Valeurs maximales et caractéristiques électriques
| Number of Bits | 12 |
| Fréquence d'échantillonnage | 400 ksps |
| Number of Input Channels | 4 single-ended / 2 differential |
| Architecture | SAR (Successive Approximation) |
| Data Interface | MICROWIRE, QSPI, Serial, SPI |
| Input Type | Single-Ended, Pseudo-Differential |
| Supply Voltage (Analog) | 2.7 V to 5.5 V |
| Number of ADC Channels | 1 (with 4-input mux) |
| Boîtier / Format | 16-TSSOP (0.173, 4.40 mm Width) |
| Type de montage | Surface Mount |
| Reference Type | External or Internal (4.096 V) |
| Polarity | Unipolar (single supply) |
| Packaging | Tape & Reel (TR) |
| Statut RoHS | Compliant |
Configuration des broches de AS1532-T
| Broche 1 | AIN1 — Analog input channel 1 (single-ended or differential positive) |
| Broche 2 | AIN2 — Analog input channel 2 |
| Broche 3 | AIN3 — Analog input channel 3 |
| Broche 4 | AIN4 — Analog input channel 4 (or differential negative) |
| Broche 5 | REF — Voltage reference input/output (internal 4.096V) |
| Broche 6 | AGND — Analog ground |
| Broche 7 | GND — Digital ground |
| Broche 8 | SCLK — Serial clock input |
| Broche 9 | DOUT — Serial data output |
| Broche 10 | DIN — Serial data input |
| Broche 11 | CS — Chip select (active low) |
| Broche 12 | DVDD — Digital supply voltage |
| Broche 13 | AVDD — Analog supply voltage |
| Broche 14 | CONVST — Conversion start input |
| Broche 15 | PD — Power-down control input |
| Broche 16 | EOC — End of conversion output |
Applications typiques
AS1532-T convient pour 6 applications: Portable Battery-Powered Data Acquisition, Multi-Channel Transducer / Bridge Sensor Readout, Industrial Process Control Front End, Portable Medical Monitoring Devices, Embedded System Analog Front End, Automotive Sensor Digitization (Non-Safety).
Portable Battery-Powered Data Acquisition
The AS1532-T's single 2.7-5.5 V supply and low power dissipation that scales with sample rate make it ideal for portable battery-powered data acquisition. The 4-channel input mux enables multi-sensor scanning without external switches, while the integrated 4.096 V reference option eliminates a discrete reference IC. With a low duty-cycle power-down mode, the AS1532-T supports multi-year battery life in environmental monitoring, handheld test equipment, and field-instrumentation designs.
Recommandé
Multi-Channel Transducer / Bridge Sensor Readout
The AS1532-T's 4 single-ended or 2 differential input channels with true 12-bit no-missing-code performance suit transducer and bridge-sensor readout applications such as load cells, strain gauges, and thermocouples. The 400 ksps sample rate captures fast transient events while the SAR architecture provides the low-latency, deterministic sampling needed for control-loop feedback. Differential inputs reject common-mode noise in industrial environments with long sensor cable runs.
Recommandé
Industrial Process Control Front End
The AS1532-T's 4-channel mux and SPI/QSPI/MICROWIRE-compatible serial interface integrate easily into industrial process-control front ends reading 4-20 mA loop sensors, RTDs, or pressure transducers. Its single 2.7-5.5 V supply operates from 24V-to-5V post-regulated rails common in industrial PLCs. The TSSOP package's 4.40 mm width fits dense DIN-rail-mount module designs where board area is constrained by channel density requirements.
Recommandé
Portable Medical Monitoring Devices
The AS1532-T's low power consumption and small 16-TSSOP footprint enable portable medical monitoring devices such as pulse oximeters, blood-pressure cuffs, and body-worn vital-sign monitors. The 400 ksps sample rate captures pulse-waveform detail at low duty cycle, preserving battery life. The integrated input mux allows sequential reading of multiple biosensor electrodes (ECG, temperature, SpO2) without external analog switches, reducing BOM and PCB area.
Recommandé
Embedded System Analog Front End
The AS1532-T connects directly to microcontrollers via SPI, making it a drop-in analog front end for embedded systems reading potentiometers, thermistors, current shunts, and other analog signals. Its 4 channels match the ADC needs of typical 32-bit MCUs that lack sufficient on-chip ADC channels. The 12-bit resolution is appropriate for HVAC control, appliance sensor readout, and consumer-electronics user-interface sensing where 1 LSB = 1 mV accuracy is sufficient.
Recommandé
Automotive Sensor Digitization (Non-Safety)
While not AEC-Q100 qualified, the AS1532-T's wide supply range and 4-channel mux suit non-safety automotive sensor digitization such as body-comfort modules reading seat-position, climate, or interior-light sensors. The TSSOP package withstands standard automotive reflow profiles. For safety-critical ADAS sensors, an AEC-Q100-qualified part such as TI's ADS7824-Q1 should be considered; however, the AS1532-T serves well in cost-sensitive body-electronics designs.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour AS1532-T — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | AS1533-T | AD7995YRMZ-0 | AD7994BRU-0REEL | ADS7822PG4 | ADS7824PG4 |
|---|---|---|---|---|---|---|
| Brand | ams OSRAM | ams OSRAM | Analog Devices | Analog Devices | Texas Instruments | Texas Instruments |
| Package | 16-TSSOP | 16-TSSOP - same | 16-TSSOP - same | 16-TSSOP - same | 16-TSSOP - same | 16-TSSOP - same |
| Resolution | 12-bit | 12-bit | 12-bit | 12-bit | 12-bit | 12-bit |
| Input Channels | 4 single-ended / 2 differential | 2 single-ended / 1 differential | 4 single-ended | 4 single-ended | 1 single-ended | 4 single-ended |
| Serial Interface | SPI / MICROWIRE / QSPI | SPI / MICROWIRE / QSPI | I2C | I2C | SPI | SPI |
| Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
| Architecture | SAR | SAR | SAR | SAR | SAR | SAR |
Principaux différenciateurs
- Higher sample rate than AS1533-T for fast transient capture (vs AS1533-T)
- Four-channel input multiplexer eliminates external analog switches (vs ADS7822PG4)
- SPI/QSPI/MICROWIRE-compatible interface vs I2C on ADI alternatives (vs AD7995YRMZ-0)
Notes de conception
The AS1532-T operates from a single 2.7 V to 5.5 V supply. Decouple AVDD and DVDD independently using 10uF bulk capacitors in parallel with 0.1uF ceramic capacitors placed within 5 mm of the supply pins. For best noise performance, separate analog and digital ground planes with a single-point connection beneath the IC. The internal reference (typically 4.096 V) requires a 1uF to 10uF bypass capacitor on the REF pin; using a smaller value degrades noise and linearity performance.
Route analog input traces as microstrip lines over a continuous ground plane to minimize noise pickup. Keep digital control lines (SCLK, CS, DIN, CONVST) away from analog input traces to avoid capacitive coupling of switching transients. Place the TSSOP thermal pad on a copper pour stitched with thermal vias to the ground plane for improved thermal dissipation and reduced ground-bounce noise. Match trace lengths on differential inputs (AIN1/AIN2 or AIN3/AIN4 in differential mode) to maintain common-mode rejection.
Do not exceed the absolute maximum analog input voltage of AVDD + 0.3 V; overvoltage on the AIN pins can latch up and permanently damage the part. The sample-and-hold front end requires a low-impedance source - driving directly from a high-value potentiometer (> 10 kohm) introduces gain error due to the input sampling current. Add an op-amp buffer for source impedances above 1 kohm. The chip-select pin must be held low during the entire conversion; toggling CS mid-conversion aborts the result.
The SAR architecture's input sampling injects a small charge kick-back into the analog source. For high-precision measurements, add a 1nF to 10nF capacitor between AIN and ground to absorb this charge and stabilize the input voltage before the next conversion. The SCLK signal integrity is critical - use a clean clock source with sharp edges; ringing on SCLK can cause double-clocking and corrupt serial data. Add a series 33 ohm resistor at the SCLK driver output to dampen transmission-line reflections on long PCB traces.
Informations de conformité
RoHS and REACH compliant per DigiKey product listing. Not AEC-Q100 qualified - choose AEC-Q100-qualified parts such as TI ADS7824-Q1 for automotive safety-critical applications. Halogen-free and conflict-mineral status not explicitly stated in verified web data.
