REF2033AIDDCR - 3.3V & 1.65V Dual Voltage Reference | TI
料号： REF2033AIDDCR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 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 概述
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.
直接替换替代料： REF2033AIDDCR ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
REF2033AIDDCT
✅ 直接替换📋 参考替代料（不在目录中）
REF2030AIDDCR
✅ 直接替换📋 参考替代料（不在目录中）
REF2025AIDDCT
✅ 直接替换📋 参考替代料（不在目录中）
REF2041AIDDCR
✅ 直接替换📋 参考替代料（不在目录中）
REF2033AIDDCR 最大额定值与电气特性
| 输出类型 | 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 |
| 输入电压范围 | 3.32 V to 5.5 V |
| 静态电流 | 0.36 mA (typical) |
| 使能引脚 | Yes |
| 工作温度 | -40°C to +125°C |
| 封装 | SOT-23-THIN (DDC), 5 pins |
| 安装类型 | Surface Mount |
| Series | REF2033 (REF20xx family) |
| Rating | Catalog |
| RoHS 状态 | Compliant |
REF2033AIDDCR sot-23-thin (ddc), 5 pins 引脚配置指南
REF2033AIDDCR（sot-23-thin (ddc), 5 pins 封装）的引脚配置。 该功率器件具有栅极、漏极和源极端子。对于无极性封装，请参阅制造商数据手册以了解确切的引脚 1 方向和封装尺寸细节。常见应用包括电源设计、电机驱动和负载开关。
暂无详细引脚数据： REF2033AIDDCR.
请参阅 数据手册 以查看完整引脚配置。
典型应用
REF2033AIDDCR 适用于 6 应用s: 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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
推荐产品汇总
工程参考数据： REF2033AIDDCR ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | 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 |
关键差异点
- Dual output with die-level tracking （对比 REF3033AIDDCR (single-output REF30 family))
- 8 ppm/°C maximum drift, A-grade accuracy （对比 REF2030AIDDCR)
- Enable pin for duty-cycled systems （对比 REF2025AIDDCT)
设计说明
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.
合规信息
Catalog-grade TI REF20 family part; RoHS compliant per distributor listings. REACH, halogen-free, and conflict minerals status not stated in the provided data.
