Overview
The LT1009IDR, manufactured by Texas Instruments, is a precision-trimmed 2.5-V shunt regulator. This device is characterized by its low dynamic impedance and a wide operating current range, making it suitable for a variety of applications. The LT1009IDR features on-chip trimming, which minimizes the initial voltage tolerance and the temperature coefficient, ensuring high accuracy and stability. It also includes a third terminal (ADJ) that allows the reference voltage to be adjusted ±5% to eliminate system errors.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| Reference Voltage (VZ) | 2.495 | 2.500 | 2.505 | V |
| Reverse Dynamic Impedance (rZ) | 0.2 | 0.4 | 0.6 | Ω |
| Initial Tolerance | ±5 mV (LP package) | ±10 mV (D and PW packages) | mV | |
| Operating Temperature Range | –40°C to 85°C (LT1009I) | 0°C to 70°C (LT1009C) | °C | |
| Package Type | SOIC (D) - 8 pins |
Key Features
- Excellent Temperature Stability
- Initial Tolerance: ±5 mV Max (LP package), ±10 mV Max (D and PW packages)
- Dynamic Impedance: 0.6 Ω Max
- Wide Operating Current Range
- Directly Interchangeable With LM136-2.5
- No Adjustment Needed for Minimum Temperature Coefficient
- Adjustable Reference Voltage ±5% via ADJ Terminal
Applications
- 5-V System References
- 8-bit Analog-to-Digital Converter (ADC) and Digital-to-Analog Converter (DAC) References
- Power-Supply Monitors
- Digital Voltmeters
- Current-Loop Measurement and Control Systems
Q & A
- What is the reference voltage of the LT1009IDR?
The reference voltage of the LT1009IDR is 2.5 V, with an initial tolerance of ±5 mV in the LP package and ±10 mV in the D and PW packages.
- What is the dynamic impedance of the LT1009IDR?
The dynamic impedance of the LT1009IDR is 0.6 Ω Max.
- What are the operating temperature ranges for the LT1009IDR?
The LT1009I operates from –40°C to 85°C, and the LT1009C operates from 0°C to 70°C.
- Can the LT1009IDR be used as a replacement for the LM136-2.5?
Yes, the LT1009IDR can be used as a terminal-for-terminal replacement for the LM136-2.5, eliminating the need for an external trim network.
- Does the LT1009IDR require any adjustments for temperature coefficient?
No, the LT1009IDR does not require any adjustments for the minimum temperature coefficient.
- How can the reference voltage of the LT1009IDR be adjusted?
The reference voltage can be adjusted ±5% via the ADJ terminal.
- What are some common applications of the LT1009IDR?
Common applications include 5-V system references, ADC and DAC references, power-supply monitors, digital voltmeters, and current-loop measurement and control systems.
- What is the package type of the LT1009IDR?
The LT1009IDR is available in an SOIC (D) package with 8 pins.
- How does the LT1009IDR achieve its high accuracy?
The LT1009IDR achieves its high accuracy through on-chip trimming, which minimizes the initial voltage tolerance and the temperature coefficient.
- What is the significance of the adjustable reference voltage in the LT1009IDR?
The adjustable reference voltage allows for the elimination of system errors by adjusting the reference voltage ±5% via the ADJ terminal.
