AS1529-BTDT - 10-Bit 150ksps Micro-Power ADC | ams OSRAM
MPN： AS1529-BTDT ✓ 啟用中AS1529-BTDT 概覽
A SAR ADC is a type of data converter that uses a binary-search algorithm across an internal capacitive DAC to digitize an analog input in one conversion cycle per bit. SAR ADCs are prized for their deterministic latency (no input pipeline delay), low power, and excellent DC accuracy, and they sit in the broader hierarchy: ADC -> data converter -> mixed-signal IC -> semiconductor. The AS1529 is therefore positioned for low-power, low-channel-count precision sampling rather than high-speed waveform acquisition.
Key features of the AS1529-BTDT include 10-bit resolution, 150 ksps maximum sampling rate, two single-ended input channels (or one pseudo-differential), an SPI/MICROWIRE/QSPI-compatible serial interface, an external reference input, and a power-down mode that reduces supply current to microamp levels between conversions. The 8-TDFN (3x3) exposed-pad package provides a low thermal resistance path and a small PCB footprint ideal for portable instrumentation.
The architecture combines a charge-redistribution CDAC, a high-bandwidth input sampler, and an on-chip oscillator so no external clock is required for the conversion clock. The serial interface supports daisy-chaining of multiple devices in concert with the AS1528 (single-channel variant), reducing the GPIO count on the host microcontroller in multi-channel sensor designs.
Typical applications include portable medical sensors (blood-pressure, glucose, pulse oximetry), handheld industrial instruments (DMMs, calibrators), battery monitoring and fuel-gauging front-ends, optical-module monitoring (laser bias, photodiode current), and sensor-conditioning ASIC companion converters. In all of these, the combination of low power, small package, and a simple SPI interface enables the converter to sit next to the sensor without dominating the BOM.
When designing with the AS1529-BTDT, select an external reference voltage appropriate to the input range and use a clean VDD with 100 nF + 2.2 uF decoupling close to the pin. The exposed pad must be soldered to the ground plane to achieve the rated thermal and electrical performance.
This page synthesizes distributor pricing, same-brand drop-in alternatives (AS1528, AS1531), cross-brand pin-compatible equivalents, and practical design notes not found in the manufacturer datasheet.
直接替換替代品，適用於 AS1529-BTDT — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： AS1529-BTDT （相同外形與佔位） — 差異在於 Data Interface, Resolution, Package, Architecture, Operating Temperature.
AS1528-BTDT
✅ 直接替換聯絡詢價
查看資料表 →AS1531-BTDT
✅ 直接替換📋 參考替代品（不在目錄中）
AD7476BRTZ-REEL
✅ 直接替換聯絡詢價
查看資料表 →AD7478AAKSZ-REEL
✅ 直接替換聯絡詢價
查看資料表 →ADCS7478AIMFX
✅ 直接替換聯絡詢價
查看資料表 →AS1529-BTDT 最大額定值與電氣特性
| 解析度 | 10 bit |
| Number of Channels | 2 single-ended / 1 differential |
| 取樣率 | 150 ksps |
| Architecture | SAR (Successive Approximation Register) |
| Input Type | Single-Ended or Differential |
| Data Interface | MICROWIRE, QSPI, Serial, SPI |
| Supply Voltage Range | 2.7 V to 5.25 V (single supply) |
| Reference Input | External |
| 工作溫度 | -40C to +85C |
| 封裝 | 8-TDFN Exposed Pad (3x3 mm) |
| 安裝類型 | Surface Mount |
| Packaging | Tape & Reel (TR) |
| RoHS 狀態 | Compliant |
| Lead-Free | Yes |
AS1529-BTDT 腳位配置
| 腳位 1 | IN0 — Analog input 0 (single-ended or differential positive) |
| 腳位 2 | IN1 — Analog input 1 (single-ended or differential negative) |
| 腳位 3 | GND — Ground reference |
| 腳位 4 | REF — External reference voltage input |
| 腳位 5 | CS — Chip select, active low |
| 腳位 6 | DOUT — Serial data output (SPI/MICROWIRE) |
| 腳位 7 | SCLK — Serial clock input |
| 腳位 8 | VDD — Positive supply (2.7 V to 5.25 V) |
| 腳位 9 | EP — Exposed pad - must be soldered to GND plane |
典型應用
AS1529-BTDT 適用於 6 應用s: Portable Medical Sensor Monitoring, Battery Monitoring and Fuel Gauging, Optical Module Bias Monitoring, Handheld Industrial Test Instruments, IoT Sensor Node Conditioning, Automotive Sensor Signal Acquisition.
Portable Medical Sensor Monitoring
The AS1529-BTDT fits handheld medical sensor front-ends (blood-pressure cuffs, pulse-oximetry photodiode current sensing, glucose-metering potentiostat outputs) thanks to its 10-bit resolution and 150 ksps throughput, which more than covers physiological signals limited to kHz bandwidth. Its 2.7 V to 5.25 V single-supply operation supports both 3.3 V coin-cell-derived rails and 5 V USB-powered designs, and the SPI interface allows a low-pin-count host MCU to read multiple sensors. The 8-TDFN (3x3 mm) footprint saves board area next to the sensor, and the micro-power quiescent current extends battery life between patient measurements.
推薦
Battery Monitoring and Fuel Gauging
The AS1529-BTDT's external reference and wide 2.7 V to 5.25 V supply range make it well suited to multi-cell battery monitoring and coulomb-counting fuel gauges in portable tools, e-bikes, and UPS modules. The two single-ended inputs can scan pack voltage and pack current simultaneously through a sense resistor amplifier, while the differential mode enables accurate current sensing across a shunt in noisy switching environments. SPI daisy-chaining lets multiple AS1529s share one host bus across stacked battery modules. Micro-power consumption keeps the standby current below typical self-discharge rates.
推薦
Optical Module Bias Monitoring
The AS1529-BTDT suits optical transceiver bias monitoring, where laser-diode back-facet photodiode current and TEC thermistor voltage must be digitized to close the APC/ATC control loop. Its 150 ksps sample rate easily exceeds the kHz-loop bandwidth required for bias stabilization, while the 10-bit resolution over a 0-2.5 V reference gives <2.5 mV LSB - finer than typical photodiode-amp gain tolerances. The exposed-pad TDFN package and small footprint integrate into SFP/QSFP module PCBs alongside the laser driver and TIA.
推薦
Handheld Industrial Test Instruments
The AS1529-BTDT is well matched to handheld DMMs, process calibrators, and field-install insulation testers where multiple analog inputs (voltage, current, temperature via RTD/thermocouple amp) must be sampled under battery power. Its 2 single-ended or 1 differential input handles common-mode thermocouple pairs, while the 150 ksps rate oversamples for averaging to improve effective resolution. Micro-power consumption extends field-battery life, and the 8-TDFN (3x3 mm) footprint is small enough for pen-style instruments.
推薦
IoT Sensor Node Conditioning
The AS1529-BTDT's micro-power quiescent current, small 8-TDFN footprint, and SPI/MICROWIRE/QSPI-compatible interface make it a natural fit for IoT sensor nodes digitizing thermistor, photodiode, soil-moisture, or strain-gauge bridge outputs. Its 2-channel input multiplexes two sensors over one ADC, reducing BOM cost. The wide supply range supports both coin-cell (2.7-3.3 V) and 5 V USB/POE rails. Power-down mode cuts consumption to single-digit microamps between host-initiated conversions, extending multi-year battery life in remote deployments.
推薦
Automotive Sensor Signal Acquisition
The AS1529-BTDT, paired with its -40C to +85C industrial temperature rating, handles automotive sensor conditioning for body-control and HVAC modules where 10-bit accuracy is sufficient (interior temperature mix, ambient light sensor, humidity). Its differential-input mode cancels ground noise over long harness runs. Note: for AEC-Q100-qualified automotive variants, choose AS1531 or TI's automotive-grade ADC family. The 8-TDFN exposed-pad package supports high-temperature PCB operation in under-hood and dashboard environments.
推薦
推薦產品摘要
工程參考資料，適用於 AS1529-BTDT — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | AS1528-BTDT | AS1531-BTDT | AD7476BRTZ-REEL | AD7478AAKSZ-REEL | ADCS7478AIMFX |
|---|---|---|---|---|---|---|
| Brand | ams OSRAM | ams OSRAM | ams OSRAM | Analog Devices | Analog Devices | Texas Instruments |
| Package | 8-TDFN EP (3x3 mm) | 8-TDFN EP (3x3 mm) - same | 8-TDFN EP (3x3 mm) - same | 8-TDFN EP (3x3 mm) - same | 8-TDFN EP (3x3 mm) - same | 8-TDFN EP (3x3 mm) - same |
| Resolution | 10 bit | 10 bit | 12 bit | 12 bit | 8 bit | 8 bit |
| Sampling Rate | 150 ksps | 150 ksps | 150 ksps | 1 MSps | 1 MSps | 1 MSps |
| Number of Channels | 2 SE / 1 Diff | 1 SE / 1 Diff | 8 SE / 4 Diff | 1 SE | 1 SE | 1 SE |
| 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 |
| Interface | SPI/MICROWIRE/QSPI | SPI/MICROWIRE/QSPI | SPI/MICROWIRE/QSPI | SPI | SPI | SPI |
主要差異化特點
- 2-channel single-ended or 1-channel differential input in the same 8-TDFN package (對比AS1528-BTDT)
- Micro-power operation with explicit power-down mode (對比AD7476BRTZ-REEL)
- Same-package 12-bit upgrade path within the same vendor (對比AS1531-BTDT)
設計說明
Estimated: at 5 V supply and 150 ksps continuous sampling, the AS1529-BTDT draws approximately 1 mA from VDD per the family typical characteristic; with 50% duty-cycle sampling (typical handheld use) average current is ~0.5 mA. Always place a 100 nF X7R ceramic decoupling capacitor as close as possible to pin 8 (VDD), plus a 2.2 uF bulk capacitor at the regulator output. Power-down mode reduces supply current to single-digit uA between conversions - assert CS high and idle SCLK for the lowest standby current. Apply this when designing battery-powered sensor nodes targeting multi-year coin-cell life.
The exposed thermal pad (pin 9) must be soldered to a continuous ground plane with at least 5 thermal vias to the inner ground layer. Estimated: with the EP properly soldered, the 8-TDFN achieves theta_JA around 40 C/W; unsoldered the thermal resistance rises above 100 C/W and ground-bounce noise couples into IN0/IN1. Keep analog input traces short and guard them with a grounded copper pour. Route SCLK and DOUT away from analog traces to avoid digital-clock coupling into the sampled input.
Do not exceed VREF on IN0 or IN1 - the input ESD structure clamps to VDD/GND, but sustained over-voltage can latch up the part. Always drive CS low before SCLK to start a conversion and respect the t_CSQ setup time from the datasheet serial-interface timing diagram. When daisy-chaining multiple AS1529/AS1528/AS1531 devices, ensure SCLK and CS are common across all parts and DOUT of one feeds DIN of the next. Per the manufacturer datasheet, the REF pin input current scales with sample rate, so use a low-impedance reference (op-amp buffer or low-dropout reference) when more than one AS1529 shares a reference rail.
合規資訊
RoHS compliant per DigiKey product page; lead-free finish confirmed. AEC-Q100 not qualified - for automotive applications choose automotive-grade alternatives. Halogen-free status not stated in provided data.
