REF2033AIDDCR - 3.3V & 1.65V Dual Voltage Reference | TI
Référence : REF2033AIDDCR ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $1.07 | $1,07 |
| 10 | $0.96 | $9,60 |
| 100 | $0.78 | $78,00 |
| 500 | $0.64 | $320,00 |
| 1 000 | $0.53 | $530,00 |
REF2033AIDDCR Présentation
A series voltage reference is a precision circuit that maintains a stable, accurate output voltage independent of input supply variations, load changes, and temperature. Within the power management and data-converter signal chain hierarchy, it sits upstream of ADCs and DACs, establishing the measurement scale that determines system accuracy. The REF20 family extends this concept by providing a second output at exactly half the reference voltage, which is convenient for biasing bipolar signals in single-supply systems.
Key features include two outputs (VREF and VREF/2) for single-supply analog design, excellent 8 ppm/°C (maximum) drift from -40°C to +125°C, high ±0.05% maximum initial accuracy, a 20 mA output current capability, and an enable pin for power management. Quiescent current is a low 0.36 mA (typical), making the device suitable for portable and battery-powered instruments.
The dual-output architecture pairs a precision bandgap-based series reference with an accurate buffer that tracks VREF/2. This tracking is significant: in single-supply ADC applications, bipolar input signals are biased at mid-scale using VBIAS, and any mismatch between VREF and VBIAS directly appears as offset error. The REF2033 minimizes this error by generating both voltages on the same die.
Typical applications include single-supply ADC reference and bias generation, data acquisition systems, portable instrumentation, and industrial sensor signal conditioning where a mid-supply bias is required.
When designing, ensure the input supply stays between 3.32V and 5.5V with adequate headroom above the 3.3V output, and use a load capacitor per the manufacturer datasheet recommendations to maintain stability.
This page synthesizes distributor pricing, drop-in family alternatives, and practical design notes not found in the manufacturer datasheet alone.
Alternatives de remplacement direct pour REF2033AIDDCR — 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 :
REF2033AIDDCT
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
REF2030AIDDCR
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
REF2025AIDDCT
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
REF2041AIDDCR
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
REF2033AIDDCR Valeurs maximales et caractéristiques électriques
| Type de sortie | Series voltage reference, dual output |
| VREF Output Voltage | 3.3 V |
| VBIAS Output Voltage (VREF/2) | 1.65 V |
| Initial Accuracy | ±0.05% (maximum) |
| Temperature Drift | 8 ppm/°C (maximum), -40°C to +125°C |
| Output Current | 20 mA |
| Plage de tension d'entrée | 3.32 V to 5.5 V |
| Courant de repos | 0.36 mA (typical) |
| Broche d'activation | Yes |
| Température de fonctionnement | -40°C to +125°C |
| Boîtier | SOT-23-THIN (DDC), 5 pins |
| Type de montage | Surface Mount |
| Series | REF2033 (REF20xx family) |
| Rating | Catalog |
| Statut RoHS | Compliant |
Guide de configuration des broches du REF2033AIDDCR sot-23-thin (ddc), 5 pins
Configuration des broches du REF2033AIDDCR (boîtier sot-23-thin (ddc), 5 pins). Ce composant de puissance comporte des bornes de grille, de drain et de source. Pour les boîtiers non polarisés, consultez la fiche technique du fabricant pour l'orientation exacte de la broche 1 et les détails de l'empreinte. Les applications courantes incluent la conception d'alimentations, la commande de moteurs et la commutation de charges.
Aucune donnée de brochage détaillée disponible pour REF2033AIDDCR.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
REF2033AIDDCR convient pour 6 applications: Single-Supply ADC Reference and Bias, Portable and Battery-Powered Instruments, Industrial Sensor Signal Conditioning, Audio and Signal-Path Level Shifting, Battery Management and Monitoring, Test and Measurement Equipment.
Single-Supply ADC Reference and Bias
The REF2033AIDDCR is purpose-built for single-supply data acquisition: systems measuring bipolar signals (such as audio, vibration, or bidirectional current sensors) with only a positive rail need both a converter reference and a stable mid-scale bias. The 3.3V VREF output drives the ADC reference pin while the 1.65V VBIAS output biases the analog front end at mid-scale. Because both outputs are generated on one die, their tracking error is far lower than two separate references, directly reducing mid-scale offset in the digitized signal. Place a 0.1uF to 1uF capacitor close to each output per datasheet recommendations; the 20mA output current easily drives typical SAR ADC reference inputs and bias resistor networks.
Recommandé
Portable and Battery-Powered Instruments
Handheld meters, data loggers, and portable test instruments require references that combine accuracy with minimal power draw. The REF2033AIDDCR's 0.36mA typical quiescent current and 5.5V maximum input allow direct operation from a single lithium cell via regulation or a 5V USB source, while the ±0.05% initial accuracy removes factory calibration cost in many designs. The enable pin permits the MCU to shut the reference down between measurements; with the REF20 family's fast startup, duty-cycled sampling dramatically reduces average consumption. The 8 ppm/°C maximum drift keeps readings valid across outdoor temperature swings without recalibration, an important trade-off versus cheaper Zener-type references.
Recommandé
Industrial Sensor Signal Conditioning
Industrial 4-20mA transmitters, bridge-sensor excitation, and PLC analog input modules benefit from the REF2033AIDDCR's dual-output architecture. The 3.3V VREF can excite a resistive bridge or set the span of a transmitter while VBIAS at 1.65V level-shifts bidirectional sensor outputs into the ADC's unipolar range. The -40°C to +125°C operating range covers harsh cabinet and field environments, and the 8 ppm/°C drift ensures measurement stability over seasonal temperature cycles. Because the part is a series topology, its low dropout at typical loads tolerates noisy or loosely regulated 5V industrial supplies, though input bypass capacitance of at least 1uF is recommended for supply-transient immunity.
Recommandé
Audio and Signal-Path Level Shifting
In audio codecs and single-supply op-amp stages, AC-coupled signals must be biased to a quiet mid-supply point; the REF2033AIDDCR's 1.65V VBIAS output serves as this virtual ground while the 3.3V output can reference the codec's converters. Because VBIAS derives from the same precision core as VREF, the bias point does not drift relative to the converter scale, preserving SNR and minimizing THD contributions from bias wander. The buffer output drives bias networks of several kilo-ohms within the 20mA limit. Decouple VBIAS with 1uF to keep bias impedance low at audio frequencies and to isolate it from signal currents on the VREF rail.
Recommandé
Battery Management and Monitoring
Battery monitors and fuel gauges need an accurate scale for measuring cell voltage and current. The REF2033AIDDCR provides the 3.3V reference for a monitoring ADC while the 1.65V output biases bidirectional current-sense amplifiers so both charge and discharge currents can be measured on a single supply. The 0.36mA quiescent draw is small enough that the reference itself does not meaningfully drain a multi-cell pack between periodic measurements, and the enable pin allows complete shutdown in storage mode. The ±0.05% accuracy supports state-of-charge estimates without per-unit calibration, and the DDC package minimizes PCB area in compact battery management boards.
Recommandé
Test and Measurement Equipment
Bench instruments, USB dongle scopes, and modular measurement cards use the REF2033AIDDCR as the accuracy anchor for their analog-to-digital front ends. The ±0.05% initial accuracy and 8 ppm/°C drift define a known full-scale without software calibration over the operating range, reducing production test time. The dual outputs also simplify design of offset generators and comparator thresholds at exactly half-scale. In a typical 5V-powered instrument, the input range of 3.32V to 5.5V accepts the rail directly; add 1uF input and 1uF output capacitance near the pins per the TI datasheet typical application to preserve low output impedance and transient response during fast ADC conversions.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour REF2033AIDDCR — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | REF2033AIDDCT | REF2030AIDDCR | REF2025AIDDCT | REF2041AIDDCR |
|---|---|---|---|---|---|
| Package | SOT-23-THIN (DDC), 5-pin | SOT-23-THIN (DDC) - same | SOT-23-THIN (DDC) - same | SOT-23-THIN (DDC) - same | SOT-23-THIN (DDC) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| VREF Output | 3.3 V | 3.3 V | 3.0 V | 2.5 V | 4.096 V |
| VBIAS Output (VREF/2) | 1.65 V | 1.65 V | 1.5 V | 1.25 V | 2.048 V |
| Initial Accuracy (max) | ±0.05% | ±0.05% | ±0.05% | ±0.05% | ±0.05% |
| Temperature Drift (max) | 8 ppm/°C | 8 ppm/°C | 8 ppm/°C | 8 ppm/°C | 8 ppm/°C |
| Output Current | 20 mA | 20 mA | 20 mA | 20 mA | 20 mA |
| Enable Pin | Yes | Yes | Yes | Yes | Yes |
Principaux différenciateurs
- Dual output with die-level tracking (vs REF3033AIDDCR (single-output REF30 family))
- 8 ppm/°C maximum drift, A-grade accuracy (vs REF2030AIDDCR)
- Enable pin for duty-cycled systems (vs REF2025AIDDCT)
Notes de conception
Place input and output decoupling capacitors as close to the REF2033AIDDCR pins as possible. Use a 1uF capacitor on the input and follow the TI REF20 datasheet output-capacitance recommendation (typically 1uF) on both VREF and VBIAS. Keeping the VBIAS capacitor close to the load bias point rather than the IC pin improves mid-scale bias stiffness at the ADC input where signal currents actually flow.
Estimated: the minimum input of 3.32V leaves only 20mV headroom above the 3.3V output. At 20mA full load through series pass-element resistance plus PCB trace drop (10m ohm of trace adds 0.2mV), supply sag below 3.32V risks dropout and output inaccuracy. Design the upstream 3.3V-rail regulator for at least 3.45V under worst-case load, or power the REF2033 from a 5V rail where headroom is generous.
Do not load VBIAS with dynamic signal currents that exceed the buffer drive without additional buffering; although the output handles up to 20mA, transient bias currents modulate the mid-scale bias if the decoupling capacitor is undersized. Also respect the enable pin timing: allow the startup period specified in the TI datasheet before initiating ADC conversions, or conversions taken during reference settling will show offset errors.
Informations de conformité
Catalog-grade TI REF20 family part; RoHS compliant per distributor listings. REACH, halogen-free, and conflict minerals status not stated in the provided data.
