ADC081S051CISDX/NOPB - 8-Bit 500kSPS SAR ADC, SPI, 6-WSON | TI
N.º de pieza: ADC081S051CISDX/NOPB ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $2.95 | $2,95 |
| 10 | $2.62 | $26,20 |
| 100 | $2.21 | $221,00 |
| 500 | $1.85 | $925,00 |
| 1.000 | $1.62 | $1.620,00 |
ADC081S051CISDX/NOPB Descripción general
A Successive Approximation Register (SAR) ADC is a type of data acquisition converter which converts input voltage samples using a binary-search architecture that does not require an integrating or tracking cycle, providing deterministic latency and a single conversion clock. SAR ADCs sit at the lowest level of the data converter hierarchy (SAR ADC -> ADC -> data converter -> signal chain IC -> semiconductor) and are the workhorse of embedded sensing, instrumentation, and control loops where low latency, moderate resolution, and small package size matter more than highest absolute resolution.
Key features include a straight-binary output data format compatible with SPI, QSPI, MICROWIRE, and most common DSP serial interfaces, an external SCLK-driven conversion clock, and an internal track-and-hold that eliminates the need for an external sample capacitor. The device typically dissipates 1.6 mW at 3.6 V V_A and 8.5 mW at 5.25 V V_A, with a power-down mode that drops supply current to microamp levels between conversions. The 6-WSON exposed pad gives a low thermal resistance path that supports full -40C to +85C industrial operation.
Internally the ADC uses a charge-redistribution DAC array and a comparator driven by an on-chip successive-approximation state machine; the same die is shared across the entire ADC081S051 family. The single-ended analog input is sampled on the rising edge of CS, with the conversion clock derived from SCLK, so timing can be tuned at the host controller without external components.
Typical applications include portable instrumentation, optical-module monitoring, system health and battery monitoring, sensor-signal digitization for industrial control loops, and consumer-electronics front ends where a small-footprint 8-bit ADC with a standard SPI port is needed. Pair the part with a low-noise reference and a small RC antialiasing filter at AINP for best AC performance.
When designing, note that power dissipation is dominated by V_A and sample rate; derate SCLK and f_S together so f_S never exceeds 500 ksps. Tie unused AINP to mid-supply or ground through a defined DC path so the track-and-hold never floats at an undefined bias between conversions.
Alternativas directas para ADC081S051CISDX/NOPB — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con ADC081S051CISDX/NOPB (mismo factor de forma y huella) — difiere en Package, Operating Temperature, Digital Interface, Resolution, Input Voltage Range.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
ADC081S051CISD/NOPB
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ADC101S051CISDX/NOPB
✅ Sustitución directa✓ En stock
$1.7 / unidad
Ver hoja de datos →ADC121S051CISDX/NOPB
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ADC081S101CISDX/NOPB
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ADC081S021CISDX/NOPB
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ADC081S051CISDX/NOPB Valores máximos y características eléctricas
| Resolución | 8 bit |
| Number of Channels | 1 |
| Architecture | SAR (Successive Approximation Register) |
| Sample Rate | 200 ksps to 500 ksps |
| Analog Supply Voltage (V_A) | 2.7 V to 5.25 V |
| Digital Supply Voltage (V_D) | 2.7 V to 5.25 V |
| Power Consumption (3.6 V) | 1.6 mW typical |
| Power Consumption (5.25 V) | 8.5 mW typical |
| Data Interface | SPI, QSPI, MICROWIRE, DSP-compatible serial |
| Output Format | Straight binary |
| Input Type | Single-ended |
| Temperatura de funcionamiento | -40C to +85C |
| Encapsulado | 6-WSON (NGF), 2.2 x 2.5 mm with exposed pad |
| Tipo de montaje | Surface Mount |
| Lead-Free / RoHS | Yes (NOPB suffix) |
| Conversion Clock | External SCLK |
| Internal Track-and-Hold | Yes |
Configuración de pines de ADC081S051CISDX/NOPB
| Pin 1 | VA — Analog supply voltage input (2.7 V to 5.25 V); bypass with 0.1 uF ceramic to GND |
| Pin 2 | GND — Ground return for analog and digital domains |
| Pin 3 | AINP — Single-ended analog input; sample rate 200 ksps to 500 ksps |
| Pin 4 | VDR — Digital supply / reference input; tie to VA or separate 2.7-5.25 V rail |
| Pin 5 | DOUT — Serial data output (SPI, MSB-first, straight binary) |
| Pin 6 | CS/SCLK — Chip select / serial clock input combined pin (per TI datasheet) |
Aplicaciones típicas
ADC081S051CISDX/NOPB es adecuado para 6 aplicacións: Portable Instrumentation and Handheld Meters, System Health and Battery Monitoring, Optical Module Monitoring (SFP/QSFP), Industrial Sensor Front-End, Consumer Audio and Display Backlight Control, IoT Sensor Node Digitization.
Portable Instrumentation and Handheld Meters
The ADC081S051CISDX/NOPB is well matched to portable handheld instruments where its 1.6 mW typical power at 3.6 V V_A, single 2.7-5.25 V supply, and tiny 6-WSON (NGF) footprint keep battery life and PCB area manageable. The 8-bit resolution is sufficient for display-update readings such as thermistor-derived temperature, battery-cell voltage, or photodiode current-to-voltage read-back in a digital multimeter or environmental sensor. A standard SPI port talks directly to MSP430, STM32, or PIC hosts without glue logic. Per TI datasheet typical application circuit, only four external components are required: V_A bypass cap, V_D bypass cap, optional AINP RC antialiasing filter, and CS pull-up - keeping total BOM cost under $0.50.
Recomendado
System Health and Battery Monitoring
Use the ADC081S051CISDX/NOPB to digitize battery stack voltages, rail-monitor outputs, or temperature sensors in a server, router, or UPS. Its 200-500 ksps f_S range is more than enough for a once-per-second telemetry sample at 8-bit resolution, and the wide 2.7-5.25 V V_A range allows direct connection to 3.3 V or 5 V battery nodes without a pre-amplifier. The 6-WSON package exposed pad gives low thermal resistance for hot-rail applications. Per TI datasheet, the device supports a power-down mode between conversions that drops supply current to microamp levels - ideal for sleep-mode battery monitors. Pair with an external LDO to isolate digital noise from the analog supply rail.
Recomendado
Optical Module Monitoring (SFP/QSFP)
SFP, QSFP, and SFF optical transceivers require an internal 8-bit ADC to digitize laser bias current, temperature, and received-signal-strength indicators for the host's DOM/DDM interface. The ADC081S051CISDX/NOPB's small 6-WSON (2.2x2.5 mm) footprint and SPI port fit the tight SFP cage envelope, and the 500 ksps throughput easily handles the per-second DDM update rate demanded by SFF-8472. Per TI datasheet application notes, the device can directly digitize a 0-3.3 V APD bias or thermistor divider. The 8-bit resolution is more than enough for the 0.5C temperature granularity required by SFF-8472. Use a 4.7 kohm-10 kohm NTC divider at AINP for accurate laser temperature read-back.
Recomendado
Industrial Sensor Front-End
Pair the ADC081S051CISDX/NOPB with a 4-20 mA current loop receiver or a bridge-sensor amplifier to digitize factory-floor analog signals at up to 500 ksps. The 8-bit resolution and SPI port are sufficient for threshold-based control loops (e.g., tank level, motor current, valve position) where the controller makes a binary go/no-go decision rather than a fine-grained measurement. Per TI datasheet, the -40C to +85C operating range supports industrial enclosure temperatures without derating. The wide 2.7-5.25 V supply tolerates 24 V industrial bus rails after a small LDO pre-regulation. Add a TVS diode and common-mode choke at AINP for IEC 61000-4-2/4 ESD and surge immunity.
Recomendado
Consumer Audio and Display Backlight Control
Use the ADC081S051CISDX/NOPB to read a potentiometer wiper voltage and drive a PWM backlight or audio volume register in a TV, monitor, or set-top box. The 500 ksps f_S is overkill for human-interface response times but allows the host MCU to share the ADC across multiple tasks without bottleneck. Per TI datasheet, the straight-binary SPI output simplifies firmware decoding compared to twos-complement ADCs. The 2.2x2.5 mm 6-WSON package fits underneath a potentiometer on the front-panel PCB. The 8-bit resolution gives 256 brightness steps which is perceptually smooth for backlight PWM dimming. Place a 100 ohm + 1 nF RC network at AINP to suppress potentiometer wiper noise.
Recomendado
IoT Sensor Node Digitization
The ADC081S051CISDX/NOPB is a natural fit for IoT sensor nodes that need a single extra analog channel beyond what the SoC provides - e.g. a soil-moisture probe, a gas-sensor analog output, or a battery-voltage telemetry channel alongside an ESP32 or nRF52 host. The 1.6 mW typical dissipation at 3.6 V V_A and microamp-level power-down mode between conversions support battery-life targets of years on a 2x AA cell. Per TI datasheet, the SPI port requires only three MCU GPIO pins (CS, SCLK, DOUT) so it integrates cleanly with any microcontroller peripheral. The 6-WSON (NGF) 2.2x2.5 mm footprint leaves space for a coin-cell holder or a small Li-ion cell on a typical 20x30 mm sensor PCB.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para ADC081S051CISDX/NOPB — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | ADC081S051CISD/NOPB | ADC101S051CISDX/NOPB | ADC121S051CISDX/NOPB | ADC081S101CISDX/NOPB | ADC081S021CISDX/NOPB |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 6-WSON (NGF) | 6-WSON (NGF) - same | 6-WSON (NGF) - same | 6-WSON (NGF) - same | 6-WSON (NGF) - same | 6-WSON (NGF) - same |
| Resolution | 8 bit | 8 bit - same | 10 bit | 12 bit | 8 bit - same | 8 bit - same |
| Max Sample Rate | 500 ksps | 500 ksps - same | 500 ksps - same | 500 ksps - same | 1 Msps | 200 ksps |
| 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 5.25 V - same | 2.7 V to 5.25 V - same |
| Interface | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE - same | SPI/QSPI/MICROWIRE - same | SPI/QSPI/MICROWIRE - same | SPI/QSPI/MICROWIRE - same | SPI/QSPI/MICROWIRE - same |
| Channels | 1 | 1 - same | 1 - same | 1 - same | 1 - same | 1 - same |
| Operating Temperature | -40C to +85C | -40C to +85C - same | -40C to +85C - same | -40C to +85C - same | -40C to +85C - same | -40C to +85C - same |
Diferenciadores clave
- Lowest-power 8-bit 500 ksps SAR ADC in TI's 6-WSON family (frente a ADC081S021CISDX/NOPB)
- Industry-standard SPI protocol - no proprietary glue logic (frente a ADC081S051CISD/NOPB)
- Wide 2.7 V to 5.25 V single-supply operation (frente a Generic 3.3 V-only competitors)
Notas de diseño
Place the 0.1 uF V_A and V_D bypass capacitors within 5 mm of the supply pins on a direct ground-return path with no shared vias; per TI datasheet layout recommendations, the V_A bypass cap should be a low-ESR X7R ceramic to suppress switching noise from the digital domain. Solder the exposed pad to a continuous ground copper pour of at least 10 mm x 10 mm to provide the thermal dissipation path - this is mandatory for the industrial -40C to +85C temperature grade.
Route AINP as a short trace surrounded by ground copper, with no digital traces crossing underneath; per TI datasheet AN-2024 layout guidance, the analog input trace should be no longer than 10 mm to minimize parasitic capacitance that could cause gain error at high f_S. Keep SCLK and DOUT traces length-matched within 5 mm to avoid setup/hold violations at the host MCU. If using an external reference, place the reference capacitor directly at VDR with a star-ground connection to the IC ground pin.
Add a 100 ohm series resistor plus a 1 nF capacitor to ground at AINP to form a single-pole RC anti-aliasing filter with -3 dB cutoff around 1.6 MHz, comfortably above the 500 ksps Nyquist limit. Per TI datasheet typical application circuit, this RC network also suppresses wideband RF pickup in industrial environments. For higher-impedance source signals, increase the resistor to 1 kohm but watch the throughput trade-off: at 500 ksps with 1 kohm source impedance, AC accuracy degrades by approximately 1 LSB.
Do not exceed the maximum f_S of 500 ksps; per TI datasheet absolute maximum ratings, SCLK frequencies above 10 MHz combined with high f_S can cause internal timing violations and corrupt the conversion result. Tie CS low only during the conversion and release it before the next SCLK cycle - leaving CS low permanently forces the ADC out of power-down and increases quiescent current. Avoid switching the analog input close to the falling edge of CS, which can couple charge-injection noise into the track-and-hold and cause non-monotonic codes.
Información de cumplimiento
NOPB suffix indicates lead-free / RoHS-compliant per TI ordering guide. Industrial -40C to +85C operating range; not AEC-Q100 qualified for automotive - choose automotive-grade TI ADC family if required.
