Analog Devices Inc. LT3040 Voltage Output Reference/DAC
Analog Devices Inc. LT3040 Voltage Output Reference/DAC is a buffer that employs a unique architecture that seeks to maintain the precision and accuracy of the Reference or DAC while sourcing up to 200mA. It features ADI’s ultra-low noise and ultra-high PSRR architecture for powering noise-sensitive, high accuracy systems. Designed as an advanced voltage buffer for Voltage Output References/DACs, the LT3040 features extremely low 1/f noise and very low wideband noise. It also offers excellent PSRR over a wide frequency range and low dropout performance – a typical 350mV dropout at 200mA of source current.
The operating quiescent current is nominally 2.5mA and drops to < 1μA in shutdown. The LT3040’s wide output voltage range (0V to 15V) while maintaining unity-gain operation provides virtually constant output noise, PSRR, bandwidth, and load regulation independent of the VIN voltage. The buffer also features a programmable current limit, fast-start capability, and a FAULT flag to indicate faults on the output. The LT3040 is stable with a minimum 4.7μF ceramic output capacitor. Built-in protection includes reverse supply voltage protection, reverse current protection, internal current limit with fold-back, and thermal limit with hysteresis. The LT3040 is available in thermally enhanced 12-Lead MSOP and 10-Lead 3mm×3mm DFN packages.
Features
- 1.2µVRMS (10Hz to100kHz) ultra-low wideband noise
- 0.6µVP-P (0.1Hz to 10Hz) ultra-low 1/f noise
- 4nV/√Hz at 1kHz and above ultra-low spot noise
- 73dB at 1MHz ultra-high PSRR
- 125µV ultra-low input offset
- 200mA output source current
- 1.8V to 20V wide input voltage range
- 0V to 15V rail to rail output voltage range
- Single capacitor improves noise and PSRR
- Fast start-up for VIN pin
- FAULT flag
- 1MHz high bandwidth
- 350mV low dropout voltage
- Programmable current limit
- A precision enable/UVLO
- Parallelable for lower noise and higher current
- Internal current limit with foldback
- 4.7µF ceramic minimum output capacitor
- Reverse supply and reverse current protection
- Thermal limit with hysteresis
- 10-Lead 3mm×3mm DFN and 12-Lead MSOP
Applications
- High-speed/high-precision data converters
- High precision voltage references
- Very low noise instrumentation
Associated Product
Analog Devices Inc. LT304x PSRR Linear Regulators
Regulators with ultralow noise and ultrahigh PSRR for powering noise sensitive applications.
Analog Devices Inc. LT3040 Demo Board DC2783A
Features the LT3040 200mA high performance and robust voltage reference/DAC buffer.
Typical Application
