LDO LT3045/LT3094 ideal for high-precision sensors and analog circuits

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LDO LT3094・LT3045 suitable for high-precision sensors and analog circuits

LDOs (linear regulators) are very simple devices that play an important role in removing ripple from noisy signal sources. In particular, low-noise products are useful for powering small signal sensors, analog circuits, and high-quality audio.

Analog Devices' low noise LDO series LT3045 (positive supply) /LT3094 (negative supply) contributes to the design of precision sensors and analog circuits with the following three features.

- Industry's highest level of low noise and PSRR (power supply voltage fluctuation rejection ratio)
・Distributes heat and noise by connecting in parallel
・Preparation of ±12V power supply reference board for high-precision, low-noise circuits

Industry-leading low noise and PSRR (power supply voltage rejection ratio)

Switching power supplies are often used to configure highly efficient power supply systems. However, since a power supply voltage generated by a switching power supply contains a large amount of noise, PSRR is an important factor when supplying to highly sensitive analog circuits and sensors.

The LT3045/LT3094 each achieve ultralow RMS noise of 0.8µVRMS from 10 Hz to 100 kHz. PSRR is also highly effective, with the LT3045 for positive supply output being 76 dB at1 MHz and the LT3094 for negative supply output being 74 dB at 1 MHz.

product

Input voltage range

Output voltage range

output current

Output Noise

(10hz-100kHz)

Spot Noise (10kHz)

PSRRMore

＠1MHz

Package

LT3045

1.8v to 20V

0v to 15v

500mA

0.8uVRMS

2nV/rtHz

76dB

3x3 DFN-10
MSOP12E (3x5)

LT3094

-1.8v to -20V

0v to -19.5v

500mA

0.8uVRMS

2.2nV/rtHz

74dB

3x3 DFN-10
MSOP12E (3x5)

Main specifications of LT3094/LT3045

LT3094 High Power Supply Rejection (Source: Taken from LT3094 Datasheet)

LT3045 High Power Supply Rejection Ratio (Source: Excerpt from LT3045 Datasheet)

Parallel connection distributes heat and noise

The LT3045 has a wide input voltage range of 1.8V to 20V and theLT3094 from -1.8V to -20V and can output current up to 500mA.In addition, the lower limit of the output voltage range is covered to 0V.

When choosing an LDO, heavy loads require thermal considerations, and the LT3045/LT3094 can each be paralleled with a single resistor to spread heat and noise.

The LT3045/LT3094 have the property of reducing the RMS noise of the output voltage by 1/√N for N identical devices in parallel.

Heat Generation with Paralleling LT3094s (-5V Input, -3V Output, 1A Load)

Parallel connection example of LT3094 (Source: Excerpt from LT3094 data sheet)

Parallel connection example of LT3045 (Source: Excerpt from LT3045 data sheet)

±12V power supply reference board for precision and low noise circuits available

Mpression, Macnica original technology brand that supports customer development, offers ±12V power reference boards for high precision, low noise circuits using the LT3045/LT3094. This reference board allows you to easily evaluate the performance and functionality of the LT3045/LT3094 in a realistic environment.

In addition to this board, Mpression also offers a variety of reference boards that use Analog Devices' high-performance power supply ICs. For more information,please see "Click here for recommended articles/materials."

±12V Power Reference Board and Schematics for Precision, Low Noise Circuits

Key Characteristics of the LT3045/LT3094

●LT3045
・Ultra low RMS noise: 0.8μVRMS (10Hz ~ 100kHz)
・Ultra low spot noise: 2nV/√Hz (at 10kHz)
・Super high PSRR: 76dB (1MHz)
・Output current: 500mA
・Wide input voltage range: 1.8V to 20V

・Output voltage range: 0V to 15V

・Programmable current limit
・12-pin MSOP and 10-pin 3mm × 3mm DFN packages

●LT3094
・Ultra-low RMS noise: 0.8 μVRMS (10 Hz to 100 kHz)
・Ultra-low spot noise: 2.2 nV/√Hz (at 10 kHz)
・Super high PSRR: 74 dB (1MHz)
・Output current: 500 mA
・Wide input voltage range: −1.8 V to −20 V

・Output voltage range: 0 V to −19.5 V

・Programmable current limit
・12-pin MSOP and 3 mm × 3 mm DFN packages