AS1520-T - 10-Bit 8-Ch 400ksps SAR ADC | ams OSRAM | 20-TSSOP
부품 번호: AS1520-T ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $2.85 | $2.85 |
| 10 | $2.55 | $25.50 |
| 100 | $2.18 | $218.00 |
| 500 | $1.84 | $920.00 |
| 1,000 | $1.52 | $1,520.00 |
| 2,500 | $1.32 | $3,300.00 |
AS1520-T 개요
A SAR ADC is a successive-approximation-register analog-to-digital converter that converts an analog input into a 10-bit (or higher) digital code using a binary-search technique against a precision reference. SAR ADCs are valued for deterministic latency, low power, and excellent DC accuracy with no pipeline delay. The AS1520/AS1521 family fits the hierarchy: SAR ADC -> data converter -> data acquisition IC -> mixed-signal semiconductor -> analog IC, and serves battery-powered and remote-sensor designs where low quiescent current and small package matter most.
Key features include 400 ksps throughput (AS1520, 8 channels) versus 300 ksps for the 4-channel AS1521, single 2.7 V to 5.25 V supply, integrated 8-channel analog input mux, and shutdown mode that drops supply current to a few microamps. Successive-approximation architecture delivers ±1 LSB INL and ±1 LSB DNL over the full operating range. The serial interface reduces pin count and simplifies isolated or low-EMI signal-chain layouts.
Typical applications include battery-powered remote sensor nodes, multi-channel data-acquisition front ends, portable instrumentation, industrial process-control analog inputs, and handheld meter analog boards. The wide supply range and shutdown mode make it particularly useful for solar or energy-harvested sensor nodes that must minimize quiescent draw between conversions.
When designing with the AS1520-T, ensure the reference voltage is stable and well-bypassed: SAR accuracy is set by reference noise and ADC reference-drive impedance. Use a 10 nF plus 1 uF decoupling pair on REF, keep analog and digital grounds joined at a single point, and place the RC anti-alias filter immediately at each analog input to limit wideband noise fold-back.
This page synthesizes distributor pricing, parametric same-package alternatives drawn from the Site MPN list, and practical design notes - information engineers cannot find by reading the manufacturer datasheet alone.
드롭인 대체품: AS1520-T — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: AS1520-T (동일 폼 팩터 및 풋프린트) — 차이점: Architecture, Input Type, Operating Temperature, Package, Reference Type.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
AS1521-T
✅ 드롭인✓ 재고 있음
$2.34 / 개
데이터시트 보기 →AS1520-T 최대 정격 & 전기적 특성
| 분해능 | 10 bit |
| Architecture | SAR (Successive Approximation) |
| Number of Analog Inputs | 8 (single-ended) |
| 샘플링 속도 | 400 ksps |
| 공급 전압 | 2.7 V to 5.25 V (single) |
| 셧다운 전류 | typically <1 uA |
| INL (max) | ±1 LSB |
| DNL (max) | ±1 LSB |
| Input Type | Single-ended, 8:1 mux |
| Data Interface | Serial (SPI-compatible) |
| Reference Type | External |
| 동작 온도 | -40 C to +85 C |
| 패키지 | 20-TSSOP (4.40 mm body width) |
| 실장 유형 | Surface Mount |
| MSL 레벨 | 1 |
| RoHS 상태 | Compliant |
AS1520-T 핀 구성
| 핀 1 | IN0 — Analog input channel 0 |
| 핀 2 | IN1 — Analog input channel 1 |
| 핀 3 | IN2 — Analog input channel 2 |
| 핀 4 | IN3 — Analog input channel 3 |
| 핀 5 | IN4 — Analog input channel 4 |
| 핀 6 | IN5 — Analog input channel 5 |
| 핀 7 | IN6 — Analog input channel 6 |
| 핀 8 | IN7 — Analog input channel 7 |
| 핀 9 | GND — Ground |
| 핀 10 | REF — External reference voltage input |
| 핀 11 | VDD — Analog supply (2.7 V to 5.25 V) |
| 핀 12 | SHDN — Shutdown input (active low) |
| 핀 13 | NC — Not connected (per datasheet) |
| 핀 14 | CS — Chip select (active low) |
| 핀 15 | SCLK — Serial clock input |
| 핀 16 | DOUT — Serial data output |
| 핀 17 | NC — Not connected (per datasheet) |
| 핀 18 | NC — Not connected (per datasheet) |
| 핀 19 | NC — Not connected (per datasheet) |
| 핀 20 | NC — Not connected (per datasheet) |
일반적인 애플리케이션
AS1520-T 적합 용도: 6 애플리케이션s: Battery-Powered Remote Sensor Nodes, Multi-Channel Data Acquisition Front Ends, Portable Instrumentation and Handheld Meters, Industrial Process-Control Analog Inputs, Energy-Harvested Sensor Boards, Automotive Sensor Interface Modules.
Battery-Powered Remote Sensor Nodes
The AS1520-T suits battery-powered remote sensor nodes because it integrates an 8-to-1 mux on a single IC and shuts down to under 1 uA between conversions, dramatically extending cell life. With 400 ksps throughput and a 2.7 V to 5.25 V supply, it runs directly from a Li-ion cell or two AA batteries without an extra regulator. The 20-TSSOP footprint occupies only 4.40 mm of board width, leaving room for radios or BLE modules. Reference design: pair AS1520-T with an external 2.5 V reference and four thermistor bridges for a sub-1 mA active-mode 8-zone thermal monitor.
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Multi-Channel Data Acquisition Front Ends
For multi-channel data acquisition front ends, the AS1520-T integrates the mux, sample-and-hold, and SAR core in one 20-TSSOP device, eliminating the need for an external analog switch. The 400 ksps sampling rate aggregates to roughly 50 ksps per channel when scanning 8 inputs, which suits process-control analog boards and bench-top DAQs. The serial SPI-compatible interface keeps the digital pin count low and simplifies isolation with a digital isolator. Use the 10 nF plus 1 uF decoupling pair on REF and route analog/digital grounds with a star at the AGND pin.
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Portable Instrumentation and Handheld Meters
Portable instrumentation and handheld meters need small footprints, low standby current, and deterministic conversion time, all of which the AS1520-T delivers. The 10-bit resolution and 400 ksps throughput cover typical sensor signal bandwidths such as strain gauges, thermocouples through front-end amplifiers, and photo-diode currents. The 20-TSSOP package fits handheld enclosures with less than 5 mm of board width. The shutdown pin can be toggled between scans to drop consumption to under 1 uA, doubling battery life between charges.
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Industrial Process-Control Analog Inputs
Industrial process-control analog input modules benefit from the AS1520-T's 8 single-ended inputs that handle 4-20 mA loop sensors through burden resistors, plus 0-10 V process signals through dividers. The -40 C to +85 C operating range matches most factory-floor enclosures. The SAR architecture's deterministic conversion latency simplifies PLC synchronization compared to delta-sigma ADCs with output post-processing delay. Industrial designers should add TVS diodes and an RC anti-alias filter at each input for IEC 61000-4-2/4 ESD and EFT immunity.
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Energy-Harvested Sensor Boards
Energy-harvested sensor boards running from small solar cells or thermal harvesters demand ADCs with sub-mA active current and uA-range shutdown current. The AS1520-T's under-1-uA shutdown mode plus fast wake-up lets the host MCU burst-sample 8 channels, then power down between energy-collection cycles. Its 2.7 V minimum supply lets it operate directly from a supercap buffer at 3.3 V without a boost converter, reducing BOM cost and quiescent draw. Reference: use a 2.048 V external reference to maximize input range below the supply rail.
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Automotive Sensor Interface Modules
For non-safety automotive sensor interface applications such as seat-comfort sensors, cabin climate monitoring, and battery-pack cell monitoring, the AS1520-T provides 8 multiplexed inputs at 400 ksps in a compact 20-TSSOP. The -40 C to +85 C range covers cabin environments, and the wide 2.7 V to 5.25 V supply tolerates load-dump events when paired with a TVS and pre-regulator. For safety-critical ADCs, AEC-Q100-qualified alternatives should be selected; AS1520-T is not automotive-grade.
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추천 제품 요약
엔지니어링 참조 데이터: AS1520-T — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | AS1521-T | ADS7822PG4 | ADS7825UE4 |
|---|---|---|---|---|
| Package | 20-TSSOP | 20-TSSOP | 16-TSSOP | 28-TSSOP |
| Brand | ams OSRAM | ams OSRAM | Texas Instruments | Texas Instruments |
| Resolution | 10 bit | 10 bit | 12 bit | 16 bit |
| Number of Channels | 8 single-ended | 4 single-ended | 4 single-ended or 2 differential | 8 single-ended |
| Sampling Rate | 400 ksps | 300 ksps | 200 ksps | 250 ksps |
| Supply Voltage | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 4.75 V to 5.25 V |
| INL (max) | ±1 LSB | ±1 LSB | ±1 LSB | ±2 LSB |
| Shutdown Current | <1 uA | <1 uA | 10 uA (typ) | 100 uA (typ) |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
주요 차별점
- Lower shutdown current than TI alternatives (vs ADS7822PG4)
- Highest sampling rate among 10-bit 8-channel 20-TSSOP SAR ADCs (vs ADS7822PG4)
- Wider supply range than 16-bit ADS7825UE4 (vs ADS7825UE4)
설계 노트
Decouple VDD with a 10 uF tantalum in parallel with a 100 nF ceramic placed within 5 mm of the VDD pin; this pairing suppresses low-frequency supply ripple from upstream switching regulators and high-frequency digital hash from the serial interface. The AS1520-T draws the bulk of its active supply current during conversion, so a stiff local decoupling prevents reference droop that would otherwise degrade INL. Estimated: at 400 ksps continuous conversion and 5 V supply, decoupling should hold VDD ripple below 10 mV peak-to-peak to preserve ±1 LSB accuracy.
Use a single-point star ground tying AGND and DGND at the AS1520-T GND pin (pin 9); route analog input traces as differential pairs or guard-ring them, and keep digital traces (CS, SCLK, DOUT) on the opposite side of the board. Place the REF bypass pair (10 nF plus 1 uF) within 2 mm of the REF pin and route REF on its own analog trace - reference impedance and trace inductance directly set noise pickup into conversions. Keep CS, SCLK, DOUT traces short and series-terminated if they exceed 50 mm to avoid ringing into the ADC sample window.
Three pitfalls to avoid: (1) using a reference source with output impedance above 10 ohm without an op-amp buffer - SAR ADCs draw transient current during bit trials; (2) leaving SHDN floating - it must be tied high for normal operation; (3) scanning channels without allowing at least one conversion settling time after MUX switch - the first sample after a channel change can read the previous channel's settled voltage. Always discard the first conversion after a channel change for full accuracy.
규정 준수 정보
RoHS compliant per ams OSRAM product page; not AEC-Q100 qualified (consumer/industrial grade only).
