REF1930 - 3V Dual-Output Voltage Reference | Texas Instruments
N.º da peça: REF1930 ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $1.15 | $1,15 |
| 10 | $1.03 | $10,30 |
| 100 | $0.86 | $86,00 |
| 500 | $0.72 | $360,00 |
| 1.000 | $0.61 | $610,00 |
REF1930 Visão geral
A voltage reference is a precision circuit that produces a stable output voltage independent of supply variation, load changes, and temperature. It is a fundamental building block of analog and mixed-signal systems, providing the conversion reference for ADCs, DACs, and comparators. References are either shunt or series types; the REF1930 is a series reference, operating like a low-dropout regulator that sources current to the load while holding a precise voltage.
Key features include ±0.1% initial accuracy, a dual-output architecture (VREF and VREF/2) that eliminates a separate mid-supply bias divider, low quiescent current suitable for battery-powered portable instruments, and 20 mA sourcing capability for driving ADC reference inputs and op-amp bias networks.
The REF1930 uses a bandgap-based architecture with internal trimming to minimize initial error. The dual-output design is particularly valuable in single-supply systems where bipolar input signals must be biased around a mid-rail common-mode point at an ADC input. The SOT-23-THIN package suits space-constrained portable designs.
Typical applications include ADC input biasing, portable instrumentation, data acquisition systems, battery monitoring, and industrial process control front ends.
Design tip: decouple both outputs adequately with ceramic capacitors, and limit DC loading on the VREF/2 output to preserve its accuracy.
Alternativas drop-in para REF1930 — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
REF1933AIDDCR
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
REF1925AIDDCR
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
REF1941AIDDCR
⚡ Mesmo encapsulamento ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
REF1930AIDDCT
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX6037
⚡ Mesmo encapsulamento📋 Alternativa de referência (fora do catálogo)
LT1461
⚡ Mesmo encapsulamento📋 Alternativa de referência (fora do catálogo)
REF1930 Especificações
| Tipo de saída | Fixed, dual output (VREF and VREF/2) |
| Tensão de referência | 3 V (VREF) and 1.5 V (VREF/2) |
| Initial Accuracy | ±0.1% |
| Output Current | 20 mA (source) |
| Topologia | Series voltage reference |
| Temperatura de operação | -40C to +125C |
| Encapsulamento | SOT-23-THIN (DDC), 5 pins |
| Tipo de montagem | Surface Mount |
| Status RoHS | Compliant |
| Reference Type | Series (bandgap-based) |
| Product Family | REF19xx (SBOS697A) |
Configuração de pinos do REF1930
| Pino 1 | VIN — Input supply voltage |
| Pino 2 | GND — Ground reference |
| Pino 3 | VREF/2 — Half-scale 1.5V output for mid-rail biasing |
| Pino 4 | VREF — 3V precision reference output |
| Pino 5 | NC/EP-related — [DATA_NEEDED: pin 5 function - verify against SBOS697A pin configuration] |
Aplicações típicas
REF1930 é adequado para 6 aplicaçãos: ADC Input Biasing, Portable Instrumentation, Data Acquisition Systems, Battery Monitoring, Industrial Process Control Front Ends, Sensor Signal Conditioning.
ADC Input Biasing
Single-supply ADC systems processing bipolar signals need a stable mid-range voltage to bias inputs around. The REF1930's dedicated VREF/2 (1.5V) output serves this purpose directly, while the 3V VREF output supplies the ADC reference, all at ±0.1% accuracy. Placing the REF1930 ahead of an ADC with 1.5V bias on the input network eliminates the resistor divider and buffer amplifier a single-output reference would require, saving board area and improving bias accuracy since the mid-rail point is trimmed, not set by resistor tolerance. Decouple the VREF/2 pin with a ceramic capacitor for stability.
Recomendado
Portable Instrumentation
Battery-powered handheld instruments demand references with low quiescent current, tiny footprint, and high accuracy to maximize runtime and measurement quality simultaneously. The REF1930's SOT-23-THIN package (about 2.9 mm x 1.6 mm footprint class) fits dense portable PCBs, while its series topology avoids the constant bleed current of shunt references. The dual outputs serve both the measurement ADC reference and analog biasing needs from one IC. With -40C to +125C operation, it also tolerates warm handheld enclosures. Power the part directly from a battery-backed LDO rail for best noise performance.
Recomendado
Data Acquisition Systems
Multi-channel data acquisition boards require a stable conversion reference because any reference error translates directly into gain error at every channel. The REF1930's ±0.1% initial accuracy reduces calibration burden, and its 20 mA source capability drives ADC reference inputs plus reference buffers without droop. The VREF/2 output biases single-supply signal-conditioning op-amps at mid-scale so bipolar sensor signals can be digitized. In industrial DAQ front ends, pair the REF1930 with a precision ADC and low-noise op-amps, and use local 100 nF decoupling at each reference-consuming device.
Recomendado
Battery Monitoring
Battery monitoring circuits measure cell voltage relative to a known reference, so reference drift converts directly into fuel-gauge error. The REF1930 provides a stable 3V conversion reference for monitoring ADCs across the -40C to +125C industrial range, while the VREF/2 output biases comparator or op-amp thresholds at half-scale for window-detection schemes. Its low power draw suits always-on monitoring that must not drain the pack it measures. Combine with a current-sense amplifier to build a complete voltage-plus-current battery supervision front end.
Recomendado
Industrial Process Control Front Ends
Industrial transmitter and process-control front ends digitize 4-20 mA loop signals or bridge sensor outputs against a reference whose accuracy sets the system's absolute measurement limit. The REF1930's ±0.1% accuracy and wide -40C to +125C temperature range suit factory-floor electronics, and the 20 mA output drives ADC references plus RC filter networks robustly. The mid-rail VREF/2 output biases single-supply instrumentation stages. For harsh environments, protect the VIN pin with a series resistor and TVS, and follow the datasheet decoupling guidance for both outputs.
Recomendado
Sensor Signal Conditioning
Bridge sensors such as load cells, RTDs, and pressure sensors need both a precise excitation/reference voltage and a mid-supply bias for their output amplifiers. The REF1930 delivers the 3V VREF to the measurement ADC and the 1.5V VREF/2 to bias the instrumentation amplifier output at mid-scale, so ratiometric measurements remain proportionally accurate. Because both outputs come from the same trimmed bandgap, excitation-to-reference ratiometry is excellent, suppressing common drift. Keep loads on VREF/2 light and symmetric to preserve bias-point accuracy over temperature.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para REF1930 — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | REF1933AIDDCR | REF1925AIDDCR | REF1941AIDDCR | MAX6037 | LT1461 |
|---|---|---|---|---|---|---|
| Package | SOT-23-THIN (DDC) | SOT-23-THIN (DDC) - same | SOT-23-THIN (DDC) - same | SOT-23-THIN (DDC) - same | SOT-23-5 - similar footprint, different pinout | SOT-23-5 - similar footprint, different pinout |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices | Analog Devices |
| Output Voltage | 3 V + 1.5 V (VREF/2) | 3.3 V + 1.65 V (VREF/2) | 2.5 V + 1.25 V (VREF/2) | 4.096 V + 2.048 V (VREF/2) | 3 V (single output) | 3 V (single output variant) |
| Dual Output (VREF/2) | Yes | Yes | Yes | Yes | No | No |
Principais diferenciais
- Integrated VREF/2 mid-rail output (vs MAX6037)
- Family voltage scalability on one footprint (vs REF1933AIDDCR)
- 20 mA source capability (vs LT1461)
Notas de projeto
Decouple both the VIN pin and each output with ceramic capacitors per the datasheet SBOS697A application section. Place a 100 nF capacitor within 2-3 mm of VIN and appropriate output capacitance on VREF and VREF/2. Series references can oscillate if output capacitance is omitted or poorly placed; verify stability with the capacitance range recommended in the datasheet typical application circuits.
Do not apply heavy DC loading to the VREF/2 output. Its accuracy is specified for light loads, and drawing significant current degrades the 1.5V bias point. If a low-impedance mid-rail is needed, buffer VREF/2 with a low-offset op-amp such as the OPA2375. Also ensure VIN stays above the datasheet dropout requirement under worst-case load to maintain regulation.
In a 5-pin SOT-23-THIN package, power dissipation is (VIN - VOUT) x ILOAD. At VIN = 5V with a full 20 mA load, dissipation is about 40 mW, well within package limits, but at higher VIN keep load current modest. The package theta_JA is [DATA_NEEDED: thermal resistance]; for most portable applications no heatsinking or special copper pour is required at typical microamp-to-milliamp loads.
Informações de conformidade
RoHS compliance and lead-free status per DigiKey REF1930AIDDCR listing. REACH, halogen-free, and conflict mineral status not stated in provided data.
