Overview
The LM285DR-2.5, produced by Texas Instruments, is a micropower, two-terminal, band-gap voltage reference. This device operates over a wide current range of 20 μA to 20 mA and is known for its exceptionally low dynamic impedance and good temperature stability. The LM285DR-2.5 maintains a nearly constant voltage of 2.5 V between its cathode and anode, making it suitable for various applications requiring stable voltage references. On-chip trimming ensures tight voltage tolerance, and the device features low noise and long-term stability, making it ideal for micropower circuitry and battery-operated systems.
Key Specifications
| Parameter | Test Conditions | MIN | TYP | MAX | UNIT |
|---|---|---|---|---|---|
| Reference Voltage (VZ) | IZ = 20 μA to 20 mA | 2.462 | 2.5 | 2.538 | V |
| Average Temperature Coefficient of Reference Voltage (αVZ) | IZ = 20 μA to 20 mA | - | - | - | ppm/°C |
| Operating Current Range | - | 20 μA | - | 20 mA | A |
| Reference Impedance | - | - | - | 1.5 Ω | Ω |
| Junction Temperature (TJ) | - | - | - | 150 | °C |
| Storage Temperature (Tstg) | - | -65 | - | 150 | °C |
Key Features
- Operating current range of 20 μA to 20 mA
- 1.5% and 3% initial voltage tolerance
- Very low power consumption
- Exceptionally low dynamic impedance and good temperature stability
- On-chip trimming for tight voltage tolerance
- Low noise and long-term stability
- Interchangeable with industry-standard LM285-2.5 and LM385-2.5
Applications
- Portable meter references
- Portable test instruments
- Battery-operated systems
- Current-loop instrumentation
- Panel meters
- Thermocouple cold-junction compensators
Q & A
- What is the reference voltage of the LM285DR-2.5?
The reference voltage of the LM285DR-2.5 is 2.5 V, with a tolerance range of 2.462 V to 2.538 V.
- What is the operating current range of the LM285DR-2.5?
The operating current range is from 20 μA to 20 mA.
- What are the key features of the LM285DR-2.5?
The key features include low dynamic impedance, good temperature stability, low power consumption, and tight voltage tolerance due to on-chip trimming.
- What are some common applications of the LM285DR-2.5?
Common applications include portable meter references, portable test instruments, battery-operated systems, current-loop instrumentation, and panel meters.
- What is the junction temperature limit for the LM285DR-2.5?
The junction temperature limit is 150°C.
- What is the storage temperature range for the LM285DR-2.5?
The storage temperature range is from -65°C to 150°C.
- How does the LM285DR-2.5 handle capacitive loading?
The device is exceptionally tolerant of capacitive loading, making it easier to use in most reference applications.
- Can the LM285DR-2.5 be used in thermocouple cold-junction compensation?
Yes, the LM285DR-2.5 can be used in thermocouple cold-junction compensation circuits.
- What are the available packages for the LM285DR-2.5?
The LM285DR-2.5 is available in SOIC (D), TO-92 (LP), and TSSOP (PW) packages.
- How does the LM285DR-2.5 ensure stable voltage regulation?
The device uses a band-gap voltage reference that controls a high-gain amplifier and shunt pass element to maintain a nearly constant voltage, with internal frequency compensation for stable operation under various capacitive loads.
