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LM4140 Precision Voltage Reference: Features, Uses, and Specifications
The LM4140 is a high-precision, low-noise voltage reference
developed by Texas Instruments, designed for applications that demand
exceptional accuracy, low temperature drift, and ultra-low noise performance.
It is widely used in data acquisition systems, high-resolution
analog-to-digital converters (ADCs), digital-to-analog converters (DACs), and
precision instrumentation.
In this article, we’ll explore the key features, technical
specifications, and common uses of the LM4140, and why it’s a trusted choice
for precision analog designs.
What is LM4140?
The LM4140 is a high-precision voltage reference that provides a
stable output voltage regardless of temperature, supply voltage variations, or
load conditions. It features an initial accuracy as tight as ±0.1 mV, ultra-low
temperature coefficient (as low as 3 ppm/°C), and low output noise, making it
ideal for high-performance analog systems.
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Key Features of LM4140
·
Output Voltage Options: 1.024V, 2.048V, 2.5V, 4.096V, 5V
·
Initial Accuracy: ±0.1 mV typical
·
Ultra-Low Temperature Coefficient: As low as 3 ppm/°C
·
Low Noise Output: 8 µVpp (0.1 Hz to 10 Hz)
·
Low Supply Current: Typically 70 µA
·
High Output Drive Capability: Can source up to 10 mA
·
Thermal Shutdown Protection
·
Package Types: TO-92, SOIC-8, and MSOP-8
·
Factory-Trimmed for High Precision
LM4140 Specifications
Parameter
Value
Output Voltage Options 1.024V, 2.048V, 2.5V, 4.096V,
5V
Initial Accuracy ±0.1 mV (typ), ±0.2% (max)
Temperature Coefficient 3 ppm/°C (typ)
Supply Voltage Range 4.5V to 15V
Output Current Up to 10 mA
Output Noise (0.1 Hz to 10 Hz) 8 µVpp
Quiescent Current 70 µA (typ)
Operating Temperature Range –40°C to +125°C
Packages SOIC-8, MSOP-8, TO-92
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Common Applications of LM4140
1. High-Resolution ADCs and DACs
Provides a stable voltage
reference for 16-bit and 24-bit data converters.
2. Precision Instrumentation
Used in scientific
instruments and sensors requiring ultra-low drift and high accuracy.
3. Medical Equipment
Supports reliable
performance in medical devices where data integrity is critical.
4. Calibration and Test Equipment
Serves as a reference
voltage in voltage calibration sources and precision testers.
5. Data Acquisition Systems
Ensures consistent and
accurate analog measurements.
6. Analog Signal Processing
Delivers a reliable
reference voltage in low-noise analog signal chains.
Benefits of Using LM4140
·
High Accuracy: Factory-trimmed for tight output tolerance.
·
Stable Over Temperature: Ideal for environments with fluctuating
conditions.
·
Low Noise: Critical for sensitive analog circuits like audio or
sensor systems.
·
Low Power Consumption: Excellent for portable and battery-operated
systems.
·
Multiple Voltage Options: Flexible integration in a variety of
circuit designs.
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