ADC081S021CISDX - 8-Bit 50-200ksps SAR ADC | Texas Instruments
Référence : ADC081S021CISDX ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $2.18 | $2,18 |
| 10 | $1.85 | $18,50 |
| 100 | $1.42 | $142,00 |
| 500 | $1.05 | $525,00 |
| 1 000 | $0.84 | $840,00 |
ADC081S021CISDX Présentation
A successive-approximation register (SAR) ADC is a converter type that approaches the analog input with a binary-weighted DAC, completing each conversion in a fixed number of clock cycles. SAR ADCs are favored for low-latency, deterministic sampling in multiplexed data-acquisition, motor-control, and instrumentation systems. As a member of the wider family of ADCs (SAR -> ADC -> data converter -> mixed-signal IC), the ADC081S021 combines an internal track-and-hold with sub-1 mW operation to fit portable and space-constrained designs.
Key features include a single-ended analog input with input range of 0V to VA (the supply), a serial data output with clock rates up to 4 MHz, and -40C to +85C industrial operating range. The 6-lead LLP/WSON package gives the part an extremely small PCB footprint for point-of-load digitization.
The device integrates a precision reference input (using VA as the reference for full-scale), an internal oscillator, and a wide supply input. The CMOS process ensures low power dissipation while maintaining 8-bit linearity (max INL of 0.1172%) at the rated throughput.
Typical applications include portable instrumentation, handheld meters, position and motor feedback, optical-sensor digitizers, and consumer-audio front-end monitoring. The wide supply range (2.7V to 5.25V) lets one part number work across battery and 5V-rail systems.
When designing with this ADC, decouple VA with a 1uF ceramic capacitor placed within 1 cm of the pin, and route the analog input away from the serial clock to avoid digital coupling. The maximum 200 ksps sample rate requires the SCLK to remain above the minimum frequency of 1 MHz to avoid violating the conversion timing.
This page combines Verified Web Data from TI, Mouser, DigiKey, and Octopart with hand-curated drop-in alternatives and design notes not found in the manufacturer datasheet, helping engineers select and source the ADC081S021CISDX with full context.
Alternatives de remplacement direct pour ADC081S021CISDX — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec ADC081S021CISDX (même facteur de forme et même empreinte) — différant par Package, Resolution, RoHS Status, Operating Temperature, Serial Interface.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
ADC081S021CISD/NOPB
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ADC081S021CISDX
✅ Remplacement direct✓ En stock
$0.84 / unité
Voir la fiche technique →ADC101S021CISDX
✅ Remplacement direct ⚠️ Spécifications non vérifiées✓ En stock
$1.32 / unité
Voir la fiche technique →ADC121S021CISDX
✅ Remplacement direct ⚠️ Spécifications non vérifiées✓ En stock
$1.85 / unité
Voir la fiche technique →ADC081S101CISDX
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ADC101S101CISDX
✅ Remplacement direct ⚠️ Spécifications non vérifiées✓ En stock
$0.72 / unité
Voir la fiche technique →ADC081S021CISDX Valeurs maximales et caractéristiques électriques
| Résolution | 8 bits |
| Architecture | SAR (Successive Approximation Register) |
| Number of Channels | 1 |
| Sample Rate Range | 50 ksps to 200 ksps |
| Supply Voltage (VA, VDD) | 2.7 V to 5.25 V |
| Analog Input Voltage Range | 0 V to VA |
| Conversion Time | 5 us (max) |
| Maximum INL (Linearity Error) | 0.1172 % (max) |
| Power Dissipation (3V, 200 ksps) | 1.5 mW |
| Serial Interface | SPI / SSI-compatible, up to 4 MHz |
| Plage de température de fonctionnement | -40 C to +85 C (Industrial) |
| Boîtier | 6-pin WSON (HVSON) |
| Package Size | 2.2 mm x 2.5 mm |
| Type de montage | Surface Mount |
| Statut RoHS | Compliant |
| Reference | VA (supply-referenced) |
Configuration des broches de ADC081S021CISDX
| Broche 1 | VA — Analog supply voltage (2.7V to 5.25V); also used as the full-scale reference. |
| Broche 2 | GND — Ground - tie to common ground plane. |
| Broche 3 | CH — Analog input channel (0V to VA, single-ended). |
| Broche 4 | SCLK — Serial clock input (up to 4 MHz). Rising edges drive conversions. |
| Broche 5 | DOUT — Serial data output - 8 bits MSB-first, clocked out on SCLK falling edges. |
| Broche 6 | CS — Chip select, active-low. Pull high to put DOUT in high-Z. |
Applications typiques
ADC081S021CISDX convient pour 6 applications: Portable Handheld Multimeters, Industrial Position/Encoder Feedback, Optical Sensor Digitization, Battery Monitoring / Fuel Gauging, Consumer Audio Level Metering, IoT Sensor Node Digitization.
Portable Handheld Multimeters
The ADC081S021CISDX's 8-bit resolution and 50-200 ksps throughput fit battery-powered multimeter digitizers that read voltage, current, and resistance from an analog front-end mux. The 1.5 mW dissipation at 3V preserves battery life, and the wide 2.7V-5.25V range accepts a single Li-ion cell stack. The 6-pin WSON footprint occupies less than 5.5 mm-squared, leaving room for large LCDs and shunt resistors.
Recommandé
Industrial Position/Encoder Feedback
Quadrature encoders and rotary-position sensors output analog signals that the ADC081S021CISDX can digitize at 200 ksps for closed-loop servo control. The 5 us conversion time keeps latency below 5 us, fast enough for 60 kHz motor-control loops. Industrial -40C to +85C operation supports factory automation environments. The exposed-pad WSON provides thermal dissipation for sustained 200 ksps operation.
Recommandé
Optical Sensor Digitization
Photodiodes, color sensors, and IR receivers output microamp-level currents that, after transimpedance amplification, feed the ADC081S021CISDX's 0-3V input for light-intensity reading. The 8-bit resolution gives 256 brightness levels - enough for ambient-light sensing and proximity activation. The 50 ksps minimum sample rate lets designers reduce SCLK to save power in low-speed ambient monitors.
Recommandé
Battery Monitoring / Fuel Gauging
The ADC081S021CISDX digitizes individual cell voltages in 1-4S battery packs at 50-200 ksps. The 2.7V-5.25V analog supply matches directly to 3.3V or 5V rails of common fuel-gauge MCUs. The wide operating temperature range supports both portable and outdoor energy-storage designs. The 6-WSON pad can be tied to a small ground copper pour to simplify cell-board layouts.
Recommandé
Consumer Audio Level Metering
Audio line-level signals rectified and scaled to 0-3V can be sampled by the ADC081S021CISDX at 50-200 ksps to drive LED VU-meter arrays. The 8-bit resolution gives a 1.5 dB step, sufficient for entertainment-level metering. The 1.5 mW dissipation keeps headset-amplifier headphone boards cool. The SCLK interface can share the same pin as a digital potentiometer updater.
Recommandé
IoT Sensor Node Digitization
IoT endpoints with 3V coin cells or 5V USB input use the ADC081S021CISDX to digitize temperature, humidity, and pressure transducer outputs at modest sample rates. The 1.5 mW dissipation at 3V preserves battery life, and the wide supply range supports both battery and USB power. The 6-WSON occupies less PCB area than an SOT-23-8 ADC, freeing room for radios.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour ADC081S021CISDX — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | ADC081S021CISD/NOPB | ADC101S021CISDX | ADC121S021CISDX | ADC081S101CISDX | ADC101S101CISDX |
|---|---|---|---|---|---|---|
| Package | 6-WSON (2.2x2.5 mm) | 6-WSON (2.2x2.5 mm) - same | 6-WSON (2.2x2.5 mm) - same | 6-WSON (2.2x2.5 mm) - same | 6-WSON (2.2x2.5 mm) - same | 6-WSON (2.2x2.5 mm) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Resolution | 8 bits | 8 bits | 10 bits | 12 bits | 8 bits | 10 bits |
| Max Sample Rate | 200 ksps | 200 ksps | 200 ksps | 200 ksps | 1 MSPS | 1 MSPS |
| Min Sample Rate | 50 ksps | 50 ksps | 50 ksps | 50 ksps | 500 ksps | 500 ksps |
| Supply Voltage Range | 2.7V to 5.25V | 2.7V to 5.25V | 2.7V to 5.25V | 2.7V to 5.25V | 2.7V to 5.25V | 2.7V to 5.25V |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| RoHS Compliant | Yes | Yes | Yes | Yes | Yes | Yes |
Principaux différenciateurs
- Lowest power in a 6-pin WSON SAR family (vs ADC121S021CISDX)
- Wider supply range than higher-speed alternatives (vs ADC081S101CISDX)
- Industrial-grade qualified temperature range (vs ADC101S021CISDX / ADC121S021CISDX)
Notes de conception
Place a 1 uF X7R ceramic decoupling capacitor on VA (pin 1) within 10 mm, ideally with a short, wide trace. Place a 0.1 uF capacitor in parallel for high-frequency noise. The exposed thermal pad (WSON) must be soldered to a continuous ground copper pour of at least 10 mm-squared to provide a low-impedance return path. Avoid placing any digital traces (SCLK, DOUT, CS) directly underneath the analog input pin or its trace to minimize ground-bounce coupling.
Do not exceed VA of 5.25V or go below 2.7V - the SAR logic may produce out-of-range codes. Keep SCLK frequency above 1 MHz to avoid timing violations at the rated 200 ksps sample rate. If your microcontroller drives SCLK at exactly 4 MHz at 5V, ensure the SCLK input rises within 25 ns and falls within 25 ns. Floating the CS pin during idle may cause random toggling - tie it high through a 100 kohm pull-up when not in use.
Treat VA as the analog reference and route it in a star from the regulator output. Use a separate analog ground pour beneath CH and the input resistor divider, then stitch to the main digital ground at a single point near the IC's GND pin. Maintain a 2W (2-wire, 2x clearance) gap between CH traces and any digital signal lines. The DOUT signal should be routed as an 8-bit byte stream to avoid setup-time violations at 4 MHz SCLK.
Informations de conformité
RoHS compliant per TI product page. Industrial (-40C to +85C) temperature grade per CISD designator. MSL-1 rating per JEDEC J-STD-020. Not AEC-Q100 qualified - the CISDX variant is industrial, not automotive-grade.
