AS1527-BSOU - 10-Bit 73ksps SAR ADC, External Ref, 8-SOIC | ams
MPN: AS1527-BSOU ✓ Hoạt độngAS1527-BSOU Tóm tắt
An SAR ADC is a successive-approximation-register analog-to-digital converter. It uses an internal binary-search algorithm and a precision DAC to convert an analog input into a digital code in N clock cycles, where N is the resolution. SAR ADCs occupy the tier between slow sigma-delta (high-resolution, low-speed) and fast pipeline (high-speed, high-power) converters, making them ideal for general-purpose data acquisition in instrumentation, sensor read-out, and portable battery-powered equipment where low power and moderate speed are required.
Key features include true-differential analog input architecture, low power consumption (typically under 1 mW at full speed), a 73 ksps maximum sampling rate, and SPI/MICROWIRE/QSPI-compatible serial data interface. The AS1527 differentiates from the AS1526 (its internal-2.5 V-reference sibling) by requiring an external voltage reference, which gives the designer flexibility to choose reference voltage, source, and stability independently of the supply rail.
The AS1527-BSOU's SAR core uses a charge-redistribution DAC and on-chip clock, eliminating the need for an external high-frequency master clock for conversion timing. Input sampling is controlled through a serial interface that supports daisy-chain connection of multiple devices for multi-channel systems. The wide analog input range (0 V to VREF) accommodates single-supply signal chains commonly found in 3 V sensor and transducer systems.
Typical applications include portable and battery-powered instrumentation, sensor signal conditioning (temperature, pressure, strain-gauge bridges), industrial process control loops, isolated data acquisition front-ends, and loop-powered 4-20 mA smart transmitters. The 8-SOIC footprint keeps the solution footprint under 30 mm^2 on a single-layer PCB, ideal for compact modules.
When designing with this device, pay close attention to the analog input bandwidth, source-impedance matching, and reference decoupling. Place a 0.1 uF ceramic bypass capacitor within 5 mm of the VDD pin and a 10 uF tantalum or ceramic bulk capacitor on the reference input to minimize conversion noise; reference-noise above 1 mV RMS will degrade SNR and limit effective resolution.
This page synthesizes distributor pricing from DigiKey/Mouser, parametric drop-in alternatives sourced from the FindIC cross-reference data, and practical PCB/layout design guidance not consolidated in the manufacturer datasheet itself.
Bộ thay thế dễ dàng lắp đặt cho AS1527-BSOU — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với AS1527-BSOU (cùng hình factor và footprint) — khác nhau ở Package, Data Interface, Architecture, Resolution, Input Type.
AS1527-BSOT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →AS1526-BSOU
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →AS1526-BSOT
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX1243AESA+
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7476BRTZ-REEL
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →AS1527-BSOU Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 10 bits |
| Number of Channels | 1 (single-ended) |
| Tỷ lệ lấy mẫu | 73 ksps |
| Architecture | SAR (Successive Approximation) |
| Điện áp cung cấp | 2.7 V to 3.6 V (single supply) |
| Điện áp tham chiếu | External (0 V to VREF range) |
| Analog Input Range | 0 V to VREF |
| Data Interface | SPI, MICROWIRE, QSPI (serial) |
| Hộp | 8-SOIC (3.90 mm body width) |
| Kiểu lắp đặt | Surface Mount |
| Packaging | Tube |
| Trạng thái RoHS | Compliant |
Cấu hình chân AS1527-BSOU
| Chân 1 | CS/SHDN — Chip-select input / shutdown control (active-low) |
| Chân 2 | VDD — Positive analog/digital supply, 2.7 V to 3.6 V |
| Chân 3 | GND — Ground reference for analog and digital domains |
| Chân 4 | VIN — Analog input (single-ended, range 0 V to VREF) |
| Chân 5 | REF — External voltage reference input |
| Chân 6 | DOUT/DRDY — Serial data output / data-ready indicator |
| Chân 7 | SCLK — Serial interface clock input |
| Chân 8 | DIN — Serial data input (for daisy-chain / configuration) |
Ứng dụng tiêu biểu
AS1527-BSOU phù hợp cho 7 Áp dụngs: Portable Battery-Powered Instrumentation, Industrial Process Control / 4-20 mA Loop Transmitters, Sensor Signal Conditioning Read-out, Isolated Data Acquisition Front-End, Automotive Sensor Modules, Medical Patient Monitoring, Audio / Voice Band Signal Digitization.
Portable Battery-Powered Instrumentation
The AS1527-BSOU's 2.7 V to 3.6 V single-supply operation makes it native to 3 V lithium coin-cell and Li-ion chemistries commonly used in handheld DMMs, portable scopes, and field meters. Its 10-bit 73 ksps throughput is sufficient for transducer front-ends such as thermistor strings, load-cell bridges, and pH probes. Unlike 5 V-only ADCs, the AS1527-BSOU directly digitizes sensors without level-shifters, reducing BOM and quiescent current. Pairing with a low-power MCU (e.g., MSP430 or STM32L) yields multi-week battery life on a single CR2032.
Được đề xuất
Industrial Process Control / 4-20 mA Loop Transmitters
In smart loop-powered 4-20 mA transmitters, the AS1527-BSOU digitizes bridge pressure, differential pressure, or temperature signals at the field-end. Its SPI/MICROWIRE interface allows the loop MCU to read conversions without an external bus, while the external-reference input supports ratiometric measurement against the bridge excitation voltage, canceling excitation drift. The 8-SOIC package fits inside standard HART transmitter heads where PCB area is constrained to a 6 mm diameter circle.
Được đề xuất
Sensor Signal Conditioning Read-out
The AS1527-BSOU is well-matched to low-bandwidth analog sensors (temperature, humidity, gas, strain-gauge bridges) where 10-bit resolution is acceptable. Its 73 ksps throughput supports oversampling for noise averaging, effectively delivering 11-12 noise-free bits at lower output data rates. The wide analog input range (0 V to VREF) accommodates 3.3 V sensor rails directly. The SAR architecture provides single-cycle conversion with no latency, ideal for event-triggered sensor capture.
Được đề xuất
Isolated Data Acquisition Front-End
In isolated ADC front-ends (digital isolator + ADC), the AS1527-BSOU's low power consumption and serial SPI interface simplify optocoupler or digital-isolator channel count. A typical design has the AS1527 digitizing a high-voltage analog signal on the field side, then passing the SPI data across an isolation barrier (e.g., ADuM1411) to the controller side. The 8-SOIC footprint keeps the isolated module compact, and the 3 V supply matches common isolated-side regulators.
Được đề xuất
Automotive Sensor Modules
Although not AEC-Q100 qualified by default, the AS1527-BSOU's 2.7 V to 3.6 V single supply and SPI interface are common in non-safety automotive body modules (battery monitors, HVAC sensors, ambient-light sensors). The wide operating supply tolerates cranking transients on 12 V vehicle buses when paired with a 3.3 V regulator. Designers should verify AEC-Q100 status with ams OSRAM for safety-critical applications; otherwise, the part is suitable for body-electronics-class designs.
Được đề xuất
Medical Patient Monitoring
The AS1527-BSOU suits non-critical patient-monitoring peripherals (wearable pulse monitors, temperature patches) where 10-bit resolution is acceptable and low power consumption extends battery life. Its single 3 V supply is compatible with medical-grade Li-ion coin cells, and the SPI interface simplifies firmware integration. For safety-critical measurements (ECG, SpO2), designers should consider higher-resolution 16/24-bit sigma-delta ADCs (e.g., ADS129x family); AS1527 is appropriate for supplementary sensor channels.
Được đề xuất
Audio / Voice Band Signal Digitization
Although SAR ADCs are not typical for audio (sigma-delta dominates), the AS1527-BSOU's 73 ksps throughput is sufficient for 8 kHz / 16 kHz voice-band digitization in low-cost intercom and toy audio applications. Its 10-bit dynamic range is acceptable for voice intelligibility rather than music fidelity. Designers can run the ADC at 16 ksps and stream data via SPI to a small MCU that performs simple voice compression or playback, achieving full-duplex voice in a compact 8-SOIC footprint.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho AS1527-BSOU — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | AS1527-BSOT | AS1526-BSOU | AS1526-BSOT | MAX1243AESA+ | AD7476BRTZ-REEL |
|---|---|---|---|---|---|---|
| Brand | ams OSRAM | ams OSRAM | ams OSRAM | ams OSRAM | Analog Devices (Maxim) | Analog Devices |
| 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 bits | 10 bits | 10 bits | 10 bits | 10 bits | 12 bits |
| Sampling Rate | 73 ksps | 73 ksps | 73 ksps | 73 ksps | 73 ksps | 1000 ksps (1 MSps) |
| Supply Voltage | 2.7 V to 3.6 V | 2.7 V to 3.6 V | 2.7 V to 3.6 V | 2.7 V to 3.6 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V |
| Reference | External | External | Internal 2.5 V | Internal 2.5 V | External | External |
| Interface | SPI / MICROWIRE / QSPI | SPI / MICROWIRE / QSPI | SPI / MICROWIRE / QSPI | SPI / MICROWIRE / QSPI | SPI / MICROWIRE | SPI / QSPI / MICROWIRE / DSP |
Bảo phân biệt quan trọng
- External reference for design flexibility (vsAS1526-BSOU)
- Wider supply voltage range than AS1527-BSOU for 5 V systems (vsMAX1243AESA+)
- Lower speed and lower power than AD7476 family (vsAD7476BRTZ-REEL)
Ghi chú thiết kế
Decouple VDD with a 0.1 uF X7R ceramic capacitor placed within 5 mm of the VDD pin, plus a 10 uF tantalum or low-ESR ceramic bulk capacitor on the same rail. The AS1527-BSOU draws only a few hundred microamps during conversion, but supply transient impedance can couple into the analog input and degrade SNR. Keep digital VDD and analog VDD on a single ferrite-bead-isolated star ground, with the bead rated for at least 100 MHz impedance.
The AS1527-BSOU requires an external reference voltage applied to the REF pin - leaving REF floating will produce unpredictable conversions or saturate near full-scale. The reference source impedance should be below 10 ohm for full 10-bit accuracy; if the reference is shared with other circuitry, buffer it with a low-noise op-amp (e.g., OPA333 or AD8628). Reference noise above 1 mV RMS will directly add to input-referred noise and limit effective resolution.
Route analog input (VIN) and reference traces as short, guarded traces on a separate analog ground island. Keep digital SPI traces (CS, SCLK, DIN, DOUT) on the digital side, with the ground split bridged only at the ADC's GND pin. Place a ground pour on layer 2 directly under the SOIC package to shield the analog input from digital coupling. The 8-SOIC pad pattern should use a thermal-relief pad pattern for hand-soldering or full-pour for reflow.
Source impedance at VIN should be kept below 5 kohm to avoid THD degradation from the SAR's input sampling transients. If higher source impedance is unavoidable, add a 100 pF to 1 nF capacitor directly at the VIN pin to absorb the kickback charge. For driving the input with a high-impedance sensor, buffer with a low-leakage CMOS op-amp (e.g., AD8628) configured as a unity-gain follower; this isolates the ADC's sampling capacitor from the source impedance.
The 8-SOIC package has a thermal resistance (theta_JA) of approximately 160 C/W, but the AS1527-BSOU's low power consumption (~1 mW active, ~1 uW shutdown) means thermal rise is negligible even at full 73 ksps throughput. No heatsink or thermal copper pour is required; standard 4-layer PCB copper is sufficient. However, in enclosed industrial enclosures above 85 C ambient, derate sample rate to 50 ksps to keep junction temperature within spec.
Thông tin tuân thủ
RoHS and lead-free per DigiKey listing. AEC-Q100 not qualified by default; consult ams OSRAM for automotive-grade options. REACH and conflict-mineral declarations available from manufacturer upon request.
