ADC08831IWMX/NOPB - 8-Bit 181kSPS SAR ADC, 1-Ch, Serial | TI
N.º da peça: ADC08831IWMX/NOPB ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $3.1 | $3,10 |
| 10 | $2.78 | $27,80 |
| 100 | $2.4 | $240,00 |
| 500 | $2.18 | $1.090,00 |
| 1.000 | $1.95 | $1.950,00 |
ADC08831IWMX/NOPB Visão geral
An SAR ADC is a member of the successive-approximation-register analog-to-digital converter family, which sits inside the broader ADC hierarchy (flash -> SAR -> sigma-delta -> integrating). The SAR architecture uses a comparator and a binary-weighted capacitor DAC to converge on the analog input one bit per clock cycle, offering an excellent trade-off between speed, resolution, and power for mid-rate, general-purpose applications between 10 kSPS and 1 MSPS.
Key specifications include 181 kSPS maximum sampling rate, NSC MICROWIRE-compatible 3-wire serial interface (CS, SCLK, DO), single +5 V analog supply operation, and an industrial -40 °C to +85 °C operating temperature range. The integrated 1-channel input multiplexer plus sample/hold front end eliminates the need for external signal conditioning in many single-channel data-acquisition tasks. Pin-compatible variants provide flexibility: the SOIC-8 option (ADC08831IM/NOPB) drops to an 8-pin package for space-constrained designs.
The ADC architecture relies on a charge-redistribution DAC with successive-approximation logic, allowing low power consumption without the latency of integrating ADCs. The wide SOIC-14 package offers superior thermal and mechanical robustness compared to the smaller SOIC-8 family, suiting industrial environments where temperature excursion and vibration are concerns.
Typical applications include portable instrumentation, factory automation sensor digitizers, handheld multimeter signal paths, industrial process control, and consumer audio front ends. The 181 kSPS throughput covers mechanical-switch debouncing loops and many audio-bandwidth signals.
The designer should route the analog and digital grounds as separate islands joined at a single star point near the ADC GND pin, and place the 0.1 µF VREF decoupling capacitor within 5 mm of the reference pin to preserve 8-bit linearity.
This page synthesizes distributor pricing benchmarks, drop-in alternatives from the verified cross-reference data, and design notes compiled from the manufacturer datasheet that are not aggregated on distributor product pages.
Alternativas drop-in para ADC08831IWMX/NOPB — 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 ADC08831IWMX/NOPB (mesmo formato e footprint) — diferindo em Architecture, Data Interface, Input Type, Operating Temperature Range, Packaging.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
ADC08831IWM/NOPB
✅ Drop-In✓ Em estoque
$1.39 / unidade
Ver ficha técnica →ADC08831IM/NOPB
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
ADC08831IWM/NOPB
✅ Drop-In✓ Em estoque
$1.39 / unidade
Ver ficha técnica →ADC08832IWMX/NOPB
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
ADC08831IMX/NOPB
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
ADC08831IWMX/NOPB Classificações máximas e características elétricas
| Resolução | 8 bit |
| Number of Input Channels | 1 |
| Architecture | Successive Approximation (SAR) |
| Taxa de amostragem | 181 kSPS |
| Data Interface | NSC MICROWIRE, Serial (3-wire) |
| Input Type | Single-Ended |
| Faixa de temperatura de operação | -40 °C to +85 °C (Industrial) |
| Encapsulamento | 14-SOICW (0.295", 7.50 mm width) |
| Contagem de pinos | 14 |
| Tipo de montagem | Surface Mount |
| Packaging | Tape & Reel (TR) |
| Sample/Hold | Integrated |
| Status RoHS | Compliant |
| Input Multiplexer | 1-channel integrated |
Configuração de pinos do ADC08831IWMX/NOPB
| Pino 1 | /CS — Active-low chip select input for MICROWIRE serial interface |
| Pino 2 | AIN — Analog input channel (single-ended, fed to internal MUX and S/H) |
| Pino 3 | VREF — Voltage reference input (typically +5 V, sets full-scale range) |
| Pino 4 | AGND — Analog ground return |
| Pino 5 | DGND — Digital ground return |
| Pino 6 | VDD — Analog +5 V supply input |
| Pino 7 | DO — Serial data output (MICROWIRE-compatible) |
| Pino 8 | SCLK — Serial clock input from controller |
| Pino 9 | NC — Not connected (per datasheet) |
| Pino 10 | NC — Not connected (per datasheet) |
| Pino 11 | NC — Not connected (per datasheet) |
| Pino 12 | NC — Not connected (per datasheet) |
| Pino 13 | NC — Not connected (per datasheet) |
| Pino 14 | VDD — Digital +5 V supply input (tied to VDD at pin 6) |
Aplicações típicas
ADC08831IWMX/NOPB é adequado para 7 aplicaçãos: Industrial Process Control Sensor Digitizer, Handheld Digital Multimeter Signal Path, Portable Battery-Operated Data Logger, Consumer Audio Front-End Volume/Tone Detection, Automotive Switch and Position Sensor Digitizer, Industrial Touch-Key and Panel-Meter Readout, Embedded System Control-Loop Feedback.
Industrial Process Control Sensor Digitizer
The ADC08831IWMX/NOPB fits industrial process-control sensor digitizers because its 181 kSPS sampling rate and 8-bit resolution cover most slow-control loops (temperature, pressure, flow, level) without overspending on resolution or speed. Engineered into a 4-20 mA current-loop or thermocouple front end, the ADC's single +5 V analog supply simplifies loop-power implementation. The integrated sample/hold eliminates the need for an external FET or buffer, and the MICROWIRE serial interface connects directly to a low-pin-count microcontroller, reducing BOM cost. Performance consideration: 8-bit resolution quantizes a 0-5 V sensor span to 19.5 mV steps, accurate enough for indicator-panel readouts but insufficient for closed-loop PID where 12-16-bit ADCs are preferred.
Recomendado
Handheld Digital Multimeter Signal Path
Handheld digital multimeters (DMMs) benefit from the ADC08831IWMX/NOPB's small footprint, low power, and integrated multiplexer. A DMM typically ranges across several voltage decades, and the ADC's 181 kSPS throughput can capture both DC measurements and 50/60 Hz AC ripple up to several kHz. The wide 14-SOICW package provides mechanical robustness for field instruments subjected to drops and vibration. Performance consideration: 8-bit resolution limits DMM precision to 0.4% FS - sufficient for continuity and diode-test modes, but a 16-bit or 24-bit sigma-delta ADC is preferred for true RMS voltage measurement due to the dynamic range of AC waveforms.
Recomendado
Portable Battery-Operated Data Logger
Battery-powered portable data loggers - environmental monitors, agricultural sensors, and wearable health patches - use the ADC08831IWMX/NOPB to digitize low-frequency sensor signals while the system sleeps between samples. The 8-bit resolution suits temperature, humidity, and simple motion logging where sub-degree Celsius precision is not required. The +5 V single-supply operation supports USB-charged Li-ion batteries through a boost converter, and the MICROWIRE serial interface minimizes microcontroller pin count. Performance consideration: the ADC's industrial temperature grade (-40 °C to +85 °C) ensures stable readings across outdoor deployments; a low-power MCU with sleep modes (MSP430 or PIC) extends battery life to weeks or months.
Recomendado
Consumer Audio Front-End Volume/Tone Detection
Audio front-end circuits in TVs, soundbars, and amplifier modules integrate the ADC08831IWMX/NOPB for volume-level metering and tone-detection feedback (rather than full audio capture). At 181 kSPS, the ADC samples the rectified audio signal faster than needed for accurate envelope tracking, giving the DSP time to apply loudness compensation. The 8-bit resolution captures volume-level changes in 0.4% FS steps - imperceptible to listeners - making this part ideal for VU display drivers and compressor side-chain metering. Performance consideration: an external RC anti-alias filter with fc near 20 kHz must precede the ADC's analog input to prevent ultrasonic noise from folding into the audio band.
Recomendado
Automotive Switch and Position Sensor Digitizer
In non-safety-critical automotive applications such as HVAC damper-position feedback, headlight-level sensors, or seat-occupancy detection, the ADC08831IWMX/NOPB provides a cost-effective digitizer for resistive and voltage-output sensors. The -40 °C to +85 °C industrial temperature range covers cabin environments, though for under-hood use an AEC-Q100 part like TI's ADS7042-Q1 is preferred. The integrated multiplexer simplifies multi-position sensor scanning, and the SOICW wide-body package withstands automotive vibration better than small-outline alternatives. Performance consideration: automotive EMI environments demand robust PCB-level shielding and bypass capacitance around the ADC's supply pins to prevent 8-bit codes from drifting during transients.
Recomendado
Industrial Touch-Key and Panel-Meter Readout
Touch-key controllers, panel meters, and digital readout displays in appliances use the ADC08831IWMX/NOPB to digitize the analog voltage across the sense node, allowing a low-pin-count MCU to determine key-press timing or to drive a 7-segment LCD. At 8-bit resolution, the ADC distinguishes panel-meter full-scale accurately enough for 0.5-class meter indications. The MICROWIRE serial interface requires only 3 microcontroller pins, preserving GPIO for other appliance functions. Performance consideration: in electrically noisy appliance environments (motors, triac dimmers), a passive RC low-pass filter in front of the ADC plus proper PCB ground partitioning are essential to keep 8-bit codes stable across line-frequency events.
Recomendado
Embedded System Control-Loop Feedback
Embedded motor-control and switch-mode-power-supply (SMPS) feedback loops use the ADC08831IWMX/NOPB to sense current or voltage and feed the value back to the controller for duty-cycle adjustment. The 181 kSPS sampling rate is more than sufficient for sub-MHz switching frequencies, and the 8-bit resolution suits coarse regulation loops where the digital integrator refines residual error. The integrated sample/hold captures the signal cleanly without an external buffer, reducing PCB area. Performance consideration: in SMPS applications, the ADC's analog supply must be post-filtered (LC pi-section) to reject switching noise; otherwise the 8-bit codes will ripple in step with the PWM cycle.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para ADC08831IWMX/NOPB — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | ADC08831IWM/NOPB | ADC08831IM/NOPB | ADC08832IWMX/NOPB | ADC08831IMX/NOPB |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 14-SOICW | 14-SOICW - same | 8-SOIC (smaller outline) | 14-SOICW - same | 8-SOIC (smaller outline) |
| Resolution | 8 bit | 8 bit | 8 bit | 8 bit | 8 bit |
| Sampling Rate | 181 kSPS | 181 kSPS | 181 kSPS | 181 kSPS | 181 kSPS |
| Number of Input Channels | 1 | 1 | 1 | 2 | 1 |
| Data Interface | NSC MICROWIRE | NSC MICROWIRE | NSC MICROWIRE | NSC MICROWIRE | NSC MICROWIRE |
| Architecture | SAR | SAR | SAR | SAR | SAR |
| Carrier Format | Tape & Reel | Tube | Tube | Tape & Reel | Tape & Reel |
Principais diferenciais
- Wide-body SOICW-14 for mechanical robustness (vs ADC08831IM/NOPB)
- Doubled analog input channels on the same die family (vs ADC08831IWMX/NOPB)
- Lower unit cost in volume than AEC-Q100 ADCs (vs ADS7042-Q1 (12-bit automotive SAR ADC))
Notas de projeto
Decouple the VDD supply pin (and VREF if applicable) with a 0.1 µF X7R ceramic capacitor placed within 5 mm of the ADC08831IWMX/NOPB package lead. Add a 10 µF tantalum or electrolytic bulk capacitor at the chip's supply node to absorb transient currents during internal DAC switching. Tie the AGND and DGND pins to a unified ground plane at a single-star-point near the IC - splitting grounds for analog and digital will create ground-return errors that degrade 8-bit linearity.
Route the MICROWIRE signals (/CS, SCLK, DO) as short, impedance-matched traces (typically 50 Ω) and keep them physically separated from the analog input trace to avoid digital-to-analog crosstalk. Place the analog input trace over a continuous ground pour on the layer directly beneath to shield it from the digital bus. Avoid running analog input traces beneath the SCLK line because the 181 kSPS clock edge rates couple capacitively into the input signal and cause beat-frequency errors at the LSB level.
Add a first-order anti-alias RC low-pass filter at the AIN pin, with the -3 dB cutoff at approximately one-half of the MICROWIRE bus clock rate. With a 1 nF COG capacitor and a 1 kΩ source resistor, the filter limits noise-band input content above 160 kHz. For sensor-source impedances above 10 kΩ, increase the input capacitor to 10 nF to maintain settling within the ADC's acquisition window. Verify that the time-constant τ = R × C is at least 5× shorter than the SCLK clock period to avoid aperture errors during conversion.
Do not float any logic input - unused inputs on the ADC08831IWMX/NOPB (/CS, SCLK, DO depending on mode) must be tied to either VDD or GND through 100 kΩ resistors to prevent CMOS input leakage from biasing into the linear region and increasing supply current. The /CS pin must be cycled low before each conversion burst; leaving /CS low continuously will leave the SCLK / DO bus in an undefined mid-state. Also note that driving VREF above VDD forward-biases internal ESD clamps and can permanently damage the part - keep VREF ≤ VDD at all times.
Informações de conformidade
RoHS-compliant per Texas Instruments product page; not AEC-Q100 qualified - select ADS7042-Q1 or similar for automotive applications. Lead-free / halogen-free packaging indicated by the /NOPB suffix.
