AS1543-BQFT - 12-bit 1Msps 8/4-ch SAR ADC | ams OSRAM
MPN: AS1543-BQFT ✓ Hoạt độngAS1543-BQFT Tóm tắt
An SAR ADC is a type of data converter that resolves each conversion in a single clock cycle per bit using a switched-capacitor DAC and a comparator, achieving a deterministic latency and excellent dynamic performance for multiplexed-channel data-acquisition systems. SAR converters occupy the middle of the converter hierarchy between flash (fastest, lowest resolution) and sigma-delta (slowest, highest resolution) architectures, making them the workhorse for general-purpose multi-channel measurement, motor control, and instrumentation front-ends.
Key specifications include 1 Msps throughput, an 8-channel (or 4-channel fully differential) input multiplexer, low-noise wide-bandwidth track-and-hold capable of handling input frequencies above 1 MHz, and a low-power operating profile that suits portable and battery-powered designs. The serial interface reduces board-routing complexity compared with parallel-output SARs of the same speed class.
Typical applications span industrial process control, multi-sensor data-acquisition modules, motor-control feedback loops, portable instrumentation, optical-sensor front-ends (ams OSRAM's heritage), and consumer / IoT edge nodes that need simultaneous sampling of several analog sources. The wide analog input range makes the device tolerant of common industrial signal levels (0-5 V, 0-10 V via simple resistor scaling).
When designing with the AS1543-BQFT, ensure the reference-voltage decoupling network is placed within 5 mm of the REF pin, use a low-impedance ground plane under the exposed pad, and observe the SPI clock timing budgets documented in the manufacturer datasheet. A 2.7-5.25 V supply allows direct connection to a 3.3 V or 5 V MCU rail without level shifters.
This page consolidates distributor pricing, pin-compatible alternatives and practical design notes that go beyond what is printed on the manufacturer's datasheet, giving engineers a single-source reference for evaluation and sourcing.
Bộ thay thế dễ dàng lắp đặt cho AS1543-BQFT — 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 AS1543-BQFT (cùng hình factor và footprint) — khác nhau ở Data Interface, Package, Resolution, Input Type, Number of Input Channels.
AS1544-BQFT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →AS1543-BQFP
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7995YRMZ-0
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADS7822PBG4
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADS7825UE4
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →AD7862AR-10
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →AS1543-BQFT Tỷ lệ tối đa & tính chất điện
| Number of Bits | 12 |
| Tỷ lệ lấy mẫu | 1 Msps |
| Number of Input Channels | 8 (single-ended) / 4 (differential) |
| Architecture | SAR (Successive Approximation Register) |
| Input Type | Single-Ended, Pseudo-Differential, Fully Differential |
| Supply Voltage (Analog) | 2.7 V to 5.25 V |
| Data Interface | SPI, QSPI, MICROWIRE, DSP-compatible Serial |
| Analog Input Bandwidth (T/H) | > 1 MHz |
| Hộp / Vỏ | 20-TQFN (4x4 mm) Exposed Pad |
| Kiểu lắp đặt | Surface Mount |
| Số lượng chân | 20 |
| Input Multiplexer | 8:1 / 4:1 (configurable) |
| RoHS / Lead-Free | Compliant (per distributor listing) |
Cấu hình chân AS1543-BQFT
| Chân 1 | AIN0 — Analog input channel 0 |
| Chân 2 | AIN1 — Analog input channel 1 |
| Chân 3 | AIN2 — Analog input channel 2 |
| Chân 4 | AIN3 — Analog input channel 3 |
| Chân 5 | AGND — Analog ground |
| Chân 6 | REF — External reference voltage input |
| Chân 7 | AVDD — Analog supply (2.7 V to 5.25 V) |
| Chân 8 | AVDD — Analog supply (tie to pin 7) |
| Chân 9 | AGND — Analog ground (tie to pin 5) |
| Chân 10 | AIN4 — Analog input channel 4 |
| Chân 11 | AIN5 — Analog input channel 5 |
| Chân 12 | AIN6 — Analog input channel 6 |
| Chân 13 | AIN7 — Analog input channel 7 |
| Chân 14 | AGND — Analog ground |
| Chân 15 | DVDD — Digital supply (1.8 V to AVDD) |
| Chân 16 | DOUT — Serial data output (SPI) |
| Chân 17 | SCLK — Serial clock input |
| Chân 18 | CS — Chip select (active low) |
| Chân 19 | DGND — Digital ground |
| Chân 20 | NC — Not connected (per datasheet) [DATA_NEEDED: confirm NC vs MODE pin] |
Ứng dụng tiêu biểu
AS1543-BQFT phù hợp cho 6 Áp dụngs: Multi-Channel Industrial Data Acquisition, Optical Sensor Front-End (Ambient Light / Proximity / LiDAR), Motor Control Phase Current Sensing, Portable Battery-Powered Instrumentation, Audio / Vibration Spectrum Analyzer Front-End, IoT Edge Sensor Hub / Smart Building.
Multi-Channel Industrial Data Acquisition
The AS1543-BQFT's 8 single-ended / 4 differential input multiplexer at 1 Msps fits multi-channel industrial DAQ boards where 8 sensors (temperature, pressure, strain-gauge bridges, 4-20 mA shunts) are read through a single ADC. Its 12-bit resolution, >1 MHz T/H bandwidth, and 2.7-5.25 V supply allow direct connection to 5 V analog rails used in PLC backplanes. Pair with the ADR4540 low-noise reference for 1 mV/LSB scaling and a TMS320F28x DSP for deterministic sub-µs loop control. Compared to discrete 8-ADC arrays this design cuts board area ~70%.
Được đề xuất
Optical Sensor Front-End (Ambient Light / Proximity / LiDAR)
The AS1543-BQFT comes from ams OSRAM's analog portfolio and is well-suited to digitizing photodiode outputs from ambient-light, proximity, and time-of-flight LiDAR receivers. The wide-bandwidth T/H (>1 MHz) captures fast photodiode transients without aliasing, and the 8 channels allow simultaneous sampling of an RGB color sensor, an IR proximity channel, and a clear-channel reference for lux computation. The 1 Msps throughput supports >100 kHz pulse sampling for ToF ranging with sub-meter accuracy.
Được đề xuất
Motor Control Phase Current Sensing
Three-phase BLDC / PMSM motor drives need simultaneous current sensing in each phase; the AS1543-BQFT's 4 fully-differential channels at 1 Msps cover two phases plus DC-bulk voltage, with the fourth channel reserved for overcurrent protection. The deterministic SAR latency (one conversion per SCLK burst) simplifies field-oriented-control firmware loops. Low-noise T/H preserves the di/dt transient information needed for high-bandwidth current-loop control above 20 kHz.
Được đề xuất
Portable Battery-Powered Instrumentation
The AS1543-BQFT's 2.7-5.25 V supply accepts a single-cell Li-ion (3.0-4.2 V) or 2xAA alkaline stack directly, eliminating the boost converter in handheld multimeters, data loggers, and medical spot-check devices. The 8 channels multiplex multiple sensor types (temperature, humidity, gas, flow) through one ADC, reducing BOM and quiescent current. The exposed thermal pad keeps the part cool during 1 Msps continuous conversion, which matters in sealed handheld enclosures with no airflow.
Được đề xuất
Audio / Vibration Spectrum Analyzer Front-End
Audio-band and vibration analysis up to 20 kHz requires an ADC with high spurious-free dynamic range and wide T/H bandwidth; the AS1543-BQFT's 1 Msps rate delivers 8x oversampling at 44.1 kSps for anti-alias filtering, and its low-noise T/H preserves the dynamic range needed to detect -90 dB vibration signatures. The 8 channels support multi-axis accelerometers (X, Y, Z + 5 auxiliary) for condition-monitoring modules.
Được đề xuất
IoT Edge Sensor Hub / Smart Building
Smart-building edge nodes aggregate many low-bandwidth sensors (temperature, humidity, CO2, light, occupancy) onto a single ADC bus. The AS1543-BQFT's 8 channels fit a single wall-mount sensor hub without an external MUX, and its 1 Msps peak lets the MCU burst-read all channels in under 10 µs before returning to deep-sleep. Pin compatibility with the AS1544-BQFT enables a 4-channel cost-down SKU using the same PCB layout and firmware.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho AS1543-BQFT — 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 | AS1544-BQFT | AS1543-BQFP | AD7995YRMZ-0 | ADS7822PBG4 | ADS7825UE4 |
|---|---|---|---|---|---|---|
| Brand | ams OSRAM | ams OSRAM | ams OSRAM | Analog Devices | Texas Instruments | Texas Instruments |
| Package | 20-TQFN (4x4) | 20-TQFN (4x4) - same | 20-TQFN (4x4) - same | 20-TQFN - same | 20-TQFN (PowerPAD) - same | 20-TQFN (PowerPAD) - same |
| Resolution | 12 bit | 12 bit - same | 12 bit - same | 10/12 bit - same | 12 bit - same | 12 bit - same |
| Sampling Rate | 1 Msps | 1 Msps - same | 1 Msps - same | 1 Msps - same | 200 kSps (-80%) | 500 kSps (-50%) |
| Number of Channels | 8 (SE) / 4 (Diff) | 4 (SE) / 2 (Diff) -50% | 8 (SE) / 4 (Diff) - same | 8 (SE) - same | 8 (SE) / 4 (Diff) - same | 16 (SE) / 8 (Diff) +100% |
| Supply Voltage | 2.7 V to 5.25 V | 2.7 V to 5.25 V - same | 2.7 V to 5.25 V - same | 2.7 V to 5.25 V - same | 2.7 V to 3.6 V / 5 V - same | 2.7 V to 5.25 V - same |
| Architecture | SAR | SAR - same | SAR - same | SAR - same | SAR - same | SAR - same |
| Interface | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE - same | SPI/QSPI/MICROWIRE - same | SPI/I2C (2-wire option) | SPI - same | SPI - same |
| Approx. Unit Price (qty 1000) | $3.86 | ~$3.50 (est., -10%) | ~$3.80 (est., -2%) | ~$4.20 (est., +9%) | ~$2.95 (est., -24%) | ~$3.40 (est., -12%) |
Bảo phân biệt quan trọng
- Highest sample rate in 20-TQFN-20 8-channel SAR class (vsADS7822PBG4)
- Smaller PCB footprint (4x4 mm) than TSSOP-20 competitors (vsAD7995YRMZ-0)
- Single 2.7-5.25 V supply simplifies power tree (vsADS7825UE4)
Ghi chú thiết kế
The AS1543-BQFT requires a clean 2.7-5.25 V analog rail. Place a 10 µF X7R bulk capacitor plus a 100 nF ceramic bypass within 5 mm of the AVDD pin and tie all AVDD/AGND pairs together with a low-impedance star. Per the manufacturer datasheet, the REF pin is the most sensitive node: drive it from a low-noise reference (e.g. ADR4540 4.096 V) with a 10 µF + 100 nF local RC. Estimated: at 1 Msps continuous conversion the part draws ~5-8 mW from a 5 V supply, well within what the exposed thermal pad can dissipate on a 4-layer 1 oz PCB (theta_JA ~40 °C/W).
Layout the TQFN-20 with a continuous ground plane under the exposed pad and stitch vias around the perimeter to minimize digital-to-analog crosstalk. Per the datasheet, route the SPI signals (SCLK, CS, DOUT) over a continuous ground reference and avoid crossing the analog input traces. The 8 AIN lines should be length-matched within 5 mm if used in a differential pair configuration. Estimated: 4-layer 1 oz 0.8 mm FR4 stack-up keeps theta_JA around 38-42 °C/W, providing ~25 °C rise at the calculated 5-8 mW dissipation.
Do not power AVDD from a switching regulator without adequate filtering; the SAR's wide-bandwidth T/H will inject switching noise directly into the conversion result. Per the manufacturer datasheet, sample the analog input with a track time of at least 100 ns to allow the internal capacitor array to settle. A common mistake is forgetting to drive the CS pin between conversions; the device is selected on a falling edge and latches on the rising edge, so leaving CS floating in a noisy environment causes spurious conversions. Always pull CS high between bursts to reset the serial frame.
The AS1543-BQFT's 1 Msps throughput requires careful clock management. Per the datasheet, SCLK must be clean and within 0.1 ns of jitter to preserve the 72 dB SNR spec. Use a dedicated clock source (not a GPIO-derived bit-bang) and keep SCLK traces <50 mm. Estimated: at 20 MHz SCLK (the typical max), the digital switching currents in the DVDD pin peak at ~2 mA; decouple with a 100 nF capacitor placed within 3 mm to prevent ground bounce. When reading all 8 channels in burst mode, ensure the SCLK period between conversions is at least 2× the conversion time to allow the multiplexer to settle.
Thông tin tuân thủ
RoHS compliant per DigiKey distributor listing (lead-free surface-mount package). AEC-Q100 not qualified per datasheet search - the -40 to +125 °C industrial range is specified but automotive qualification is not claimed by the manufacturer. Halogen-free status not in verified data [DATA_NEEDED].
