ADC08031CIWM - 8-Bit SAR ADC, 1-Ch, Serial I/O | Texas Instruments
Référence : ADC08031CIWM ✗ Fin de vie| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $3.45 | $3,45 |
| 10 | $3.1 | $31,00 |
| 100 | $2.62 | $262,00 |
| 500 | $2.21 | $1 105,00 |
| 1 000 | $1.94 | $1 940,00 |
ADC08031CIWM Présentation
An SAR (Successive Approximation Register) ADC is a type of analog-to-digital converter that uses a binary-search algorithm against an internal precision DAC to resolve the input voltage in N clock cycles. SAR ADCs sit in the hierarchy: ADC -> data converter -> mixed-signal IC -> semiconductor. They are valued for deterministic latency, low latency per conversion, and DC accuracy without the pipeline delay of higher-speed flash or pipelined architectures, making them ideal for multiplexed sensor reading and motor control feedback.
Key features include 8-bit resolution, single +5V supply operation, on-chip sample-and-hold, internal 2.5V (or 5V) reference option, and a serial data output that reduces pin count versus parallel-output ADCs. The SOIC-14 wide-body package offers improved thermal performance over SOIC-8 in continuous-sampling applications and supports industrial temperature grade (-40C to +85C).
Typical applications include portable instrumentation, process control loops, battery monitoring, and embedded sensor interfaces where board space is at a premium. The serial interface allows direct connection to microcontrollers without bus-sharing glue logic.
When designing with this device, ensure the analog input bandwidth and source impedance are within the track-and-hold acquisition requirements (typically <= 10 kohm source for full accuracy). A 0.1 uF decoupling capacitor placed close to the VCC pin is mandatory; larger bulk capacitance on the analog rail further reduces reference-induced conversion noise.
This page synthesizes distributor pricing, drop-in SOIC-14 alternatives, and practical design notes not found in the bare manufacturer datasheet.
Alternatives de remplacement direct pour ADC08031CIWM — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
ADC0831CIWM
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ADC08032CIWM
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ADC08031CIWM/NOPB
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ADC08034CIWM
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ADC08031CIWM Valeurs maximales et caractéristiques électriques
| Résolution | 8 bit |
| Number of Input Channels | 1 |
| Converter Type | SAR (Successive Approximation) |
| Input Type | Single-Ended |
| Tension d'alimentation | 5 V (single supply) |
| Interface | Serial (Microwire/SPI-compatible) |
| On-Chip Track-and-Hold | Yes |
| On-Chip Voltage Reference | Yes (internal) |
| Boîtier | 14-SOIC Wide (SOIC-14, 7.5 mm body width) |
| Température de fonctionnement | -40C to +85C (industrial grade, 'I' suffix) |
| Type de montage | Surface Mount |
| Terminal Form | Gull Wing |
| Number of Terminals | 14 |
| Package Code | SOP (SOIC Wide) |
Configuration des broches de ADC08031CIWM
| Broche 1 | VREF/REF — Voltage reference input/output (internal 2.5V bandgap, or external reference input) |
| Broche 2 | AIN — Analog input (single-ended, 0 to VREF range) |
| Broche 3 | AGND — Analog ground |
| Broche 4 | DGND — Digital ground |
| Broche 5 | SCLK — Serial clock input (Microwire/SPI-compatible) |
| Broche 6 | DOUT — Serial data output (MSB first) |
| Broche 7 | CS — Chip select (active low) |
| Broche 8 | VDD — +5V analog/digital supply |
| Broche 9 | NC — Not connected (per datasheet) |
| Broche 10 | NC — Not connected (per datasheet) |
| Broche 11 | NC — Not connected (per datasheet) |
| Broche 12 | NC — Not connected (per datasheet) |
| Broche 13 | NC — Not connected (per datasheet) |
| Broche 14 | NC — Not connected (per datasheet) |
Applications typiques
ADC08031CIWM convient pour 6 applications: Portable Battery Monitoring, Industrial Process Control Sensor Interface, Embedded Sensor Reading (Microcontroller Front-End), Test & Measurement Instrumentation, Automotive Sensor Interface (Non-Safety), Audio VU / Level Detection.
Portable Battery Monitoring
The ADC08031CIWM is well suited for portable battery-monitoring applications where board space and component count matter. Its single +5V supply operation, on-chip sample-and-hold, and internal 2.5V reference remove the need for an external reference IC, keeping the BOM to a handful of passives plus the SOIC-14 ADC. The 8-bit resolution is sufficient for state-of-charge estimation where ~0.4% (1 LSB at 2.5V FS = ~9.8 mV) accuracy is adequate, and the serial Microwire/SPI interface consumes only 3 MCU pins, leaving the rest for GPIO. Typical designs use a resistor divider from the battery stack to bring 0-10V into the 0-2.5V ADC input range; source impedance is held under 10 kohm so the internal T/H settles cleanly each conversion.
Recommandé
Industrial Process Control Sensor Interface
In industrial process-control loops reading 4-20 mA or 0-10V sensor outputs, the ADC08031CIWM's single-ended 8-bit SAR core provides deterministic conversion latency critical for PID feedback. The on-chip track-and-hold acquires a snapshot of the sensor signal each cycle, free of pipeline delay, which simplifies loop timing analysis. Industrial temperature grade (-40C to +85C, 'I' suffix) covers most control-panel environments without derating. Place a 100 ohm series resistor and 1 nF cap on the analog input for EMI suppression in factory-floor installations; the ADC08031's serial interface is robust against ground-noise on long PCB traces between the sensor and the MCU.
Recommandé
Embedded Sensor Reading (Microcontroller Front-End)
The ADC08031CIWM is a natural fit as a microcontroller analog front-end when the on-chip ADC channels are exhausted or higher accuracy is needed. The serial Microwire/SPI-compatible interface connects directly to virtually any MCU with three GPIO pins, freeing the MCU's internal ADC for other tasks. Its single 5V supply aligns with 5V-tolerant MCUs common in industrial designs; for 3.3V-only MCUs a level shifter on SCLK/DOUT/CS may be needed. With 8-bit resolution and ~50 ksps throughput, it comfortably handles multiple temperature, pressure, or potentiometer sensors multiplexed in software by external switching ahead of the single input pin.
Recommandé
Test & Measurement Instrumentation
For low-cost bench-top instruments and panel meters, the ADC08031CIWM provides a simple, well-documented analog front-end. The internal reference eliminates drift calibration on the reference path during production, and the SOIC-14 Wide body simplifies hand-soldering for prototype builds. The 8-bit resolution suits digital panel meters displaying 0-99.9% of full-scale or simple data-acquisition front-ends where true 12-16 bit precision is overkill. Designers should add an input protection resistor and clamping diodes when interfacing with external test leads that may carry ESD or over-voltage events.
Recommandé
Automotive Sensor Interface (Non-Safety)
The ADC08031CIWM industrial-grade variant is commonly deployed in non-safety automotive subsystems - body controllers, HVAC blend-door feedback, lighting controls, and accessory sensors - where 8-bit resolution and industrial temp range are acceptable. The SOIC-14 Wide body gives good thermal margin in engine-bay-adjacent enclosures. For safety-critical applications (ABS, airbag, ECU sensor inputs) use AEC-Q100 qualified parts instead; the ADC08031 family is not AEC-Q100 qualified. Add an input RC filter and TVS diode on the analog line for load-dump and ESD immunity required by ISO 7637-2 transient profiles.
Recommandé
Audio VU / Level Detection
Although not a high-fidelity audio ADC, the ADC08031CIWM can digitize rectified audio levels for VU-meter displays, automatic gain-control feedback, or simple peak-detection circuits. Its 8-bit resolution at 0-5V input is more than sufficient for envelope-following of audio signals pre-rectified and low-pass-filtered. The serial output can feed an MCU PWM output driving an LED bar graph, or trigger a compressor/limiter stage. Use an external op-amp rectifier ahead of the ADC input to ensure unipolar 0-5V drive regardless of audio polarity.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour ADC08031CIWM — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | ADC0831CIWM | ADC08032CIWM | ADC08031CIWM/NOPB |
|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 14-SOIC Wide (SOIC-14) | 14-SOIC Wide (SOIC-14) - same | 14-SOIC Wide (SOIC-14) - same | 14-SOIC Wide (SOIC-14) - same |
| Resolution | 8 bit | 8 bit | 8 bit | 8 bit |
| Input Channels | 1 single-ended | 1 single-ended | 2 single-ended (mux) | 1 single-ended |
| On-Chip Reference | Yes (2.5V internal) | No (external required) | Yes (2.5V internal) | Yes (2.5V internal) |
| Interface | Serial (Microwire/SPI) | Serial (Microwire/SPI) | Serial (Microwire/SPI) | Serial (Microwire/SPI) |
| On-Chip Track-and-Hold | Yes | Yes | Yes | Yes |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
Principaux différenciateurs
- On-chip 2.5V voltage reference (vs ADC0831CIWM)
- Single-channel simplicity (vs ADC08032CIWM)
- Industrial temperature range as standard (vs Consumer-grade 8-bit SAR ADCs)
Notes de conception
Place a 0.1 uF ceramic decoupling capacitor as close as possible (within 2-3 mm) to the VDD pin (pin 8) and a 10 uF tantalum or ceramic bulk capacitor on the analog supply rail. The internal 2.5V reference is sensitive to VDD ripple; supply noise above ~50 mVpp will couple into the conversion result. For best performance, derive the analog VDD from a dedicated LDO (e.g. a 5V L7805 or LP2985) separate from the digital logic supply, even if both rails are nominally 5V.
Route the AGND (pin 3) and DGND (pin 4) as a star-ground connection back to the main ground plane, with the AGND pour directly under the SOIC-14 body. Keep the analog input trace short and away from digital lines (SCLK, DOUT, CS) to minimize digital-to-analog crosstalk. Place an input RC low-pass filter (typically 100 ohm + 1 nF) at the AIN pin if the source impedance is above 1 kohm or if the input trace picks up switching noise from nearby digital lines.
Do not leave the CS pin floating - tie it to logic-high via a 10 kohm pull-up to keep the ADC in standby when not in use, preventing spurious conversions. Ensure SCLK idle state matches the manufacturer datasheet (typically CS falling-edge triggers conversion); running SCLK before CS falls can corrupt the first conversion cycle. The internal reference requires a minimum 1 uF bypass cap on the REF pin per the manufacturer datasheet - omitting this degrades reference stability and conversion noise.
Informations de conformité
The 'I' suffix in ADC08031CIWM indicates industrial temperature grade (-40C to +85C). Lead-free / RoHS compliance status was not present in the verified web data and is marked unknown; the /NOPB suffix variant is explicitly Pb-free. The ADC08031 family is not AEC-Q100 qualified - not suitable for automotive safety-critical applications.
