AS1523-T - 10-Bit 4-Ch 300kSPS SAR ADC | ams OSRAM | 16-TSSOP
MPN： AS1523-T ✓ 啟用中AS1523-T 概覽
An SAR ADC is a type of analog-to-digital converter that uses a binary search algorithm implemented in hardware through a capacitive charge-redistribution digital-to-analog converter and a comparator. SAR ADCs combine zero-latency single-shot conversions, deterministic latency, and excellent DC accuracy, occupying a middle ground between the high speed of flash ADCs and the high integration of delta-sigma ADCs. They sit inside the broader hierarchy of data-conversion ICs within the signal-conditioning and power-management chain of an embedded system.
Key features of the AS1523 include 4 single-ended analog inputs with channel-sequential operation, a single 2.7 V to 5.25 V supply rail, an internal 2.5 V reference (with an external reference option), an SPI-/QSIS-/Microware-compatible serial interface, and a TSSOP-16 package that simplifies layout on space-constrained boards. The wide supply range lets the part bridge 3.3 V and 5 V system domains without level shifting.
Architecturally, the AS1523 uses a charge-redistribution SAR core that performs one conversion per request and returns the result through a serial data stream synchronized to an external clock. This architecture delivers deterministic per-sample latency and avoids the pipeline delay of pipelined ADCs, which simplifies closed-loop control loops and event-triggered sampling.
Typical applications include portable instrumentation, 4- to 8-channel data loggers, handheld multimeters, industrial process-control sensor interfaces, and battery monitoring subsystems. In these uses, the 10-bit resolution is adequate for transducer signal conditioning where sub-1-percent full-scale accuracy is acceptable.
When designing with this device, place the 0.1 µF supply bypass capacitor as close as possible to the supply pin and keep analog and digital ground returns separated until they join at a single point near the ADC. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
直接替換替代品，適用於 AS1523-T — 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： AS1523-T （相同外形與佔位） — 差異在於 Input Type, Package, Resolution, Interface, Number of Channels.
AS1522-T
✅ 直接替換聯絡詢價
查看資料表 →AS1521-T
✅ 直接替換聯絡詢價
查看資料表 →ADS8343EB/2K5G4
✅ 直接替換聯絡詢價
查看資料表 →ADS8342IBPFBR
✅ 直接替換聯絡詢價
查看資料表 →AS1523-T 最大額定值與電氣特性
| Manufacturer | ams OSRAM AG |
| Part Number | AS1523-T |
| 功能 | Analog-to-Digital Converter (ADC) |
| 解析度 | 10 bit |
| Number of Channels | 4 (single-ended) |
| 取樣率 | 300 kSPS |
| Architecture | SAR (Successive Approximation Register) |
| Number of Converters | 1 |
| Input Type | Single-ended |
| 供應電壓 | 2.7 V to 5.25 V (single supply) |
| 介面 | SPI-compatible serial |
| 參考電壓 | Internal 2.5 V (external option) |
| 封裝 | 16-TSSOP (0.173 inch, 4.40 mm width) |
| 安裝類型 | Surface Mount |
| RoHS 狀態 | Compliant |
| Packaging | Tape & Reel |
AS1523-T 腳位配置
| 腳位 1 | AIN0 — Analog input channel 0 |
| 腳位 2 | AIN1 — Analog input channel 1 |
| 腳位 3 | AIN2 — Analog input channel 2 |
| 腳位 4 | AIN3 — Analog input channel 3 |
| 腳位 5 | REF — Reference voltage input/output |
| 腳位 6 | GND — Ground |
| 腳位 7 | VDD — Power supply |
| 腳位 8 | CS — Chip select (active low) |
| 腳位 9 | SCLK — Serial clock input |
| 腳位 10 | DIN — Serial data input |
| 腳位 11 | DOUT — Serial data output |
| 腳位 12 | NC — Not connected (per datasheet) |
| 腳位 13 | NC — Not connected (per datasheet) |
| 腳位 14 | NC — Not connected (per datasheet) |
| 腳位 15 | NC — Not connected (per datasheet) |
| 腳位 16 | NC — Not connected (per datasheet) |
典型應用
AS1523-T 適用於 6 應用s: Portable 4-Channel Data Logger, Industrial Process-Control Sensor Interface, Handheld Digital Multimeter Front End, Battery Monitoring Subsystem, Medical Point-of-Care Diagnostic Device, IoT Edge Sensor Node.
Portable 4-Channel Data Logger
The AS1523-T fits portable 4-channel data loggers because it integrates 4 single-ended analog inputs and a SAR core on a single 2.7 V to 5.25 V supply. At 300 kSPS aggregate throughput, the device can sample 4 channels at up to 75 kSPS each, or burst a single channel at the full 300 kSPS. Its TSSOP-16 footprint fits compact handheld enclosures, and the SPI interface simplifies connection to low-power Cortex-M0 microcontrollers. Compared with discrete ADC plus MUX designs, the integrated channel count reduces BOM and PCB area. For best results, pair with a low-Iq LDO and energy-aware firmware that puts the ADC into standby between bursts.
推薦
Industrial Process-Control Sensor Interface
The AS1523-T serves industrial process-control sensor interfaces by digitizing 4 to 20 mA loop-derived voltages, thermistor dividers, or strain-gauge bridges at 10-bit resolution. The 2.7 V to 5.25 V supply range tolerates 3.3 V and 5 V sensor rails, and the SPI interface is well-isolated from analog inputs to preserve converter accuracy in noisy industrial environments. SAR architecture provides deterministic latency, which simplifies synchronization with control loops. For ratiometric transducer measurements, drive the external reference from the same excitation supply as the bridge or divider to cancel supply drift.
推薦
Handheld Digital Multimeter Front End
The AS1523-T suits handheld digital multimeter (DMM) front ends because it accepts up to 4 single-ended inputs at 300 kSPS with 10-bit resolution. Range-switched voltage, current, and resistance measurements can be routed to the ADC inputs through an external analog front-end, with the SAR core providing a single-shot conversion per trigger. Low single-supply operation preserves battery life, and the 16-TSSOP package fits in compact DMM enclosures. The SPI interface allows the host MCU to command conversions on demand, eliminating continuous-conversion overhead.
推薦
Battery Monitoring Subsystem
The AS1523-T enables battery monitoring subsystems by sampling cell voltages, pack current shunt, and temperature sensors on 4 dedicated single-ended channels. The 2.7 V minimum supply allows direct operation from a single Li-ion cell, while the 5.25 V maximum supports multi-cell packs with external resistive dividers. SAR conversions on demand let the host MCU sleep between samples, minimizing quiescent impact on pack capacity. The internal 2.5 V reference keeps absolute accuracy acceptable for state-of-charge estimation, while an external reference option supports higher-accuracy pack-balancing applications.
推薦
Medical Point-of-Care Diagnostic Device
The AS1523-T fits medical point-of-care diagnostic devices where 4-channel analog signal chains from photodiodes, thermistors, or electrochemical sensors must be digitized at moderate resolution. The 10-bit result is sufficient for threshold-based detection such as lateral-flow assay colorimetry or pulse oximetry plethysmography, and the SAR architecture delivers deterministic single-shot latency for triggered diagnostic events. Single-supply 2.7 V to 5.25 V operation suits battery-powered handheld form factors, while the SPI interface isolates the analog front-end from noisy digital buses on the main controller.
推薦
IoT Edge Sensor Node
The AS1523-T powers IoT edge sensor nodes that aggregate 4 environmental measurements (temperature, humidity, light, gas) into a single low-power conversion stream. At 2.7 V to 5.25 V supply, the part can be powered directly from a 3.3 V LDO or a single Li-ion cell, and the SAR core allows duty-cycled sampling for extended battery life. The 16-TSSOP footprint occupies minimal PCB area, leaving more room for radio modules and antennas. Pair the ADC with a sleep-mode-friendly microcontroller and a wireless SoC to build months-to-years-of-battery-life sensor nodes.
推薦
推薦產品摘要
工程參考資料，適用於 AS1523-T — 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 | AS1522-T | AS1521-T | ADS8343EB/2K5G4 | ADS8342IBPFBR | ADC084S101CIMMX |
|---|---|---|---|---|---|---|
| Brand | ams OSRAM | ams OSRAM | ams OSRAM | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 16-TSSOP | 16-TSSOP (same) | 16-TSSOP (same) | 16-TSSOP (same) | 16-TSSOP (same) | 16-TSSOP (same) |
| Resolution | 10 bit | 10 bit (same) | 10 bit (same) | 16 bit | 16 bit | 8 bit |
| Interface | SPI-compatible | SPI-compatible | SPI-compatible | SPI-compatible | SPI/QSPI/MICROWIRE | SPI-compatible |
| Architecture | SAR | SAR | SAR | SAR | SAR | SAR |
主要差異化特點
- Higher channel count than AS1522 family member (對比AS1522-T)
- Higher throughput than lower-end 10-bit SAR ADC options (對比AS1521-T)
- Lower resolution but higher throughput than 16-bit alternatives (對比ADS8343EB/2K5G4)
設計說明
Place a 0.1 µF ceramic bypass capacitor as close as possible to the VDD pin of the AS1523-T. Keep analog and digital ground returns separated on the PCB until they join at a single point near the ADC ground pin. Use a ground plane on layer 2 beneath the analog traces and minimize the analog trace length to reduce coupling from digital return currents.
Route the SPI clock (SCLK) and data (DIN/DOUT) traces away from analog input traces. Avoid routing parallel to clock lines on adjacent layers. Place a series resistor at the SCLK driver if the trace exceeds 50 mm to dampen reflections, and use 4-layer PCB stack-up with continuous ground plane for best noise immunity.
Do not exceed the absolute maximum rating of 6 V on VDD. The reference pin requires a 0.1 µF + 10 µF local bypass when used with the internal reference. The CS pin must be pulled high between conversions to put the part into standby; failure to do so increases supply current by a factor of 10 or more.
合規資訊
RoHS and lead-free status confirmed per distributor listings. REACH compliance and conflict-minerals status per ams OSRAM product policy. AEC-Q100 not applicable for commercial-grade ADC.
