Overview
The LM285D-1.2, produced by Texas Instruments, is a micropower, two-terminal, band-gap voltage reference diode. This device is designed to operate over a wide current range of 10 μA to 20 mA, making it highly versatile for various applications. It features exceptionally low dynamic impedance, low noise, and stable operation over a broad temperature range. The LM285D-1.2 is particularly useful in micropower circuitry due to its very low power consumption, making it ideal for battery-operated systems and other analog circuitry where extended battery life is crucial.
Key Specifications
| Parameter | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Operating Current Range | IZ | 10 μA | - | 20 mA | - |
| Operating Free-Air Temperature Range | TA | -40°C | - | 85°C | - |
| Reference Voltage | VZ | 1.223 V | 1.235 V | 1.247 V | V |
| Average Temperature Coefficient of Reference Voltage | αVZ | - | ±20 ppm/°C | - | - |
| Minimum Reference Current | IZ(min) | 8 μA | - | - | μA |
| Reference Impedance | ZZ | - | 0.6 Ω | 1.5 Ω | Ω |
| Broadband Noise Voltage | Vn | - | 60 μV | - | μV |
| Long-term Change in Reference Voltage | ΔVZ/Δt | - | ±20 ppm/khr | - | - |
Key Features
- Exceptionally low dynamic impedance and good temperature stability.
- Tight voltage tolerance achieved by on-chip trimming.
- Low noise and long-term stability.
- Wide dynamic operating temperature range (-40°C to 85°C for LM285D-1.2).
- Very low power consumption, making it suitable for micropower circuitry.
- Interchangeable with industry-standard voltage references.
- High tolerance to capacitive loading, making it easier to use in most reference applications.
Applications
- Portable meters and test instruments.
- Battery-operated systems.
- Current-loop instrumentation.
- Panel meters.
- General-purpose analog circuitry where extended battery life is required.
Q & A
- What is the operating current range of the LM285D-1.2? The operating current range is from 10 μA to 20 mA.
- What is the typical reference voltage of the LM285D-1.2? The typical reference voltage is 1.235 V.
- What is the temperature range for the LM285D-1.2? The operating temperature range is from -40°C to 85°C.
- How does the LM285D-1.2 handle capacitive loading? The device is exceptionally tolerant of capacitive loading, making it easier to use in most reference applications.
- What are some common applications of the LM285D-1.2? Common applications include portable meters, battery-operated systems, current-loop instrumentation, and general-purpose analog circuitry.
- What is the minimum reference current for the LM285D-1.2? The minimum reference current is 8 μA.
- How does the LM285D-1.2 perform in terms of noise? The device features low noise, with a broadband noise voltage of 60 μV.
- Is the LM285D-1.2 suitable for micropower circuitry? Yes, it is highly suitable due to its very low power consumption.
- What is the long-term stability of the LM285D-1.2? The long-term change in reference voltage is ±20 ppm/khr.
- Can the LM285D-1.2 be used in safety-critical applications? It is important to consult the datasheet and relevant safety guidelines before using the LM285D-1.2 in safety-critical applications.
