Overview
The LT1009CDR, produced by Texas Instruments, is a precision-trimmed 2.5-V shunt regulator. It features low dynamic impedance and a wide operating current range, making it highly versatile in various applications. The device is characterized by its excellent temperature stability and initial tolerance of ±5 mV in the LP package and ±10 mV in the D and PW packages. The LT1009CDR is designed to replace the LM136-2.5, offering improved performance without the need for an external trim network. It includes a third terminal (ADJ) that allows the reference voltage to be adjusted ±5% to eliminate system errors.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Conditions |
|---|---|---|---|---|---|
| Reference Voltage (VZ) | 2.495 | 2.500 | 2.505 | V | IZ = 1 mA, LP Package |
| Reference Voltage (VZ) | 2.49 | 2.500 | 2.51 | V | IZ = 1 mA, D/PW Package |
| Dynamic Impedance (rZ) | 0.2 | 0.4 | 0.6 | Ω | IR = 1 mA |
| Temperature Stability | - | - | 15 mV | - | 0°C ≤ TA ≤ 70°C |
| Average Temperature Coefficient (αVZ) | - | - | 25 ppm/°C | - | 0°C ≤ TA ≤ 70°C |
| Operating Temperature Range | 0 | - | 70 | °C | LT1009C |
| Operating Temperature Range | -40 | - | 85 | °C | LT1009I |
Key Features
- Excellent Temperature Stability
- Initial Tolerance: 0.2% Max
- Dynamic Impedance: 0.6 Ω Max
- Wide Operating Current Range
- Directly Interchangeable with LM136 for Improved Performance
- No Adjustments Needed for Minimum Temperature Coefficient
- Adjustable Reference Voltage ±5% via ADJ Terminal
- Available in 8-Lead SO, MSOP, and 3-Lead TO-92 Packages
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 LT1009CDR?
The reference voltage of the LT1009CDR 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 LT1009CDR?
The dynamic impedance of the LT1009CDR is a maximum of 0.6 Ω at IR = 1 mA.
- Can the LT1009CDR be used as a replacement for the LM136-2.5?
- What is the operating temperature range for the LT1009C and LT1009I?
The LT1009C operates from 0°C to 70°C, while the LT1009I operates from –40°C to 85°C.
- Does the LT1009CDR require any adjustments for temperature stability?
No, the LT1009CDR does not require any adjustments for minimum temperature coefficient, but it does have an ADJ terminal to adjust the reference voltage ±5% if needed.
- In what packages is the LT1009CDR available?
The LT1009CDR is available in 8-Lead SO, MSOP, and 3-Lead TO-92 packages.
- What are some common applications of the LT1009CDR?
- How does the LT1009CDR achieve its reference tolerance?
- What is the average temperature coefficient of the LT1009CDR?
- Does the LT1009CDR have any long-term stability issues?
