AS1520-T - 10-Bit 8-Ch 400ksps SAR ADC | ams OSRAM | 20-TSSOP
N.º da peça: AS1520-T ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 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 Visão geral
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.
Alternativas drop-in para AS1520-T — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com AS1520-T (mesmo formato e footprint) — diferindo em Architecture, Input Type, Operating Temperature, Package, Reference Type.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
AS1521-T
✅ Drop-In✓ Em estoque
$2.34 / unidade
Ver ficha técnica →AS1520-T Classificações máximas e características elétricas
| Resolução | 10 bit |
| Architecture | SAR (Successive Approximation) |
| Number of Analog Inputs | 8 (single-ended) |
| Taxa de amostragem | 400 ksps |
| Tensão de alimentação | 2.7 V to 5.25 V (single) |
| Corrente de desligamento | 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 |
| Temperatura de operação | -40 C to +85 C |
| Encapsulamento | 20-TSSOP (4.40 mm body width) |
| Tipo de montagem | Surface Mount |
| Nível MSL | 1 |
| Status RoHS | Compliant |
Configuração de pinos do AS1520-T
| Pino 1 | IN0 — Analog input channel 0 |
| Pino 2 | IN1 — Analog input channel 1 |
| Pino 3 | IN2 — Analog input channel 2 |
| Pino 4 | IN3 — Analog input channel 3 |
| Pino 5 | IN4 — Analog input channel 4 |
| Pino 6 | IN5 — Analog input channel 5 |
| Pino 7 | IN6 — Analog input channel 6 |
| Pino 8 | IN7 — Analog input channel 7 |
| Pino 9 | GND — Ground |
| Pino 10 | REF — External reference voltage input |
| Pino 11 | VDD — Analog supply (2.7 V to 5.25 V) |
| Pino 12 | SHDN — Shutdown input (active low) |
| Pino 13 | NC — Not connected (per datasheet) |
| Pino 14 | CS — Chip select (active low) |
| Pino 15 | SCLK — Serial clock input |
| Pino 16 | DOUT — Serial data output |
| Pino 17 | NC — Not connected (per datasheet) |
| Pino 18 | NC — Not connected (per datasheet) |
| Pino 19 | NC — Not connected (per datasheet) |
| Pino 20 | NC — Not connected (per datasheet) |
Aplicações típicas
AS1520-T é adequado para 6 aplicaçãos: 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.
Recomendado
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.
Recomendado
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.
Recomendado
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.
Recomendado
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.
Recomendado
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.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para AS1520-T — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | 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 |
Principais diferenciais
- 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)
Notas de projeto
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.
Informações de conformidade
RoHS compliant per ams OSRAM product page; not AEC-Q100 qualified (consumer/industrial grade only).
