Datasheet LT3040 (Analog Devices)

LT3040 20V, 200mA, Ultralow Noise, Ultrahigh PSRR Precision DAC/Reference Buffer
FEATURES DESCRIPTION
n
Ultralow Wideband Noise: 1.2µVRMS (10Hz to
The LT®3040 is a high performance, robust Voltage Output
100kHz)
Reference/DAC buffer that employs a unique architecture n
Ultralow 1/f Noise: 0.6µVP-P (0.1Hz to 10Hz)
that seeks to maintain the precision and accuracy of the n
Ultralow Spot Noise: 4nV/√
Hz
at 1kHz and Above
Reference or DAC while sourcing up to 200mA. It fea- n
Ultrahigh PSRR: 73dB at 1MHz
tures ADI’s ultralow noise and ultrahigh PSRR architec- n
Ultralow Input Offset: 125µV
ture for powering noise sensitive, high accuracy systems. n
Output Source Current: 200mA
Designed as an advanced voltage buffer for Voltage Output n
Wide Input Voltage Range: 1.8V to 20V
References/DACs, the LT3040 features extremely low 1/f n
Rail to Rail Output Voltage Range: 0V to 15V
noise, very low wideband noise, excellent PSRR over a n
Single Capacitor Improves Noise and PSRR
wide frequency range and low dropout performance – a n
Fast Start-Up for VIN Pin
typical 350mV dropout at 200mA of source current. n FAULT Flag Operating quiescent current is nominally 2.5mA and drops n High Bandwidth: 1MHz to <1μA in shutdown. The LT3040’s wide output voltage n Low Dropout Voltage: 350mV range (0V to 15V) while maintaining unity-gain operation n Programmable Current Limit provides virtual y constant output noise, PSRR, bandwidth n Precision Enable/UVLO and load regulation independent of the VIN voltage. Ad- n Parallelable for Lower Noise and Higher Current ditionally, the buffer features programmable current limit, n Internal Current Limit with Foldback fast start capability and a FAULT flag to indicate faults on n Minimum Output Capacitor: 4.7µF Ceramic the output. n Reverse Supply and Reverse Current Protection n Thermal Limit with Hysteresis The LT3040 is stable with a minimum 4.7μF ceramic output n 10-Lead 3mm × 3mm DFN and 12-Lead MSOP capacitor. Built-in protection includes reverse supply volt- age protection, reverse current protection, internal current
APPLICATIONS
limit with fold-back and thermal limit with hysteresis. The LT3040 is available in thermally enhanced 12-Lead MSOP n High Speed/High Precision Data Converters and 10-Lead 3mm × 3mm DFN packages. n High Precision Voltage References n Very Low Noise Instrumentation All registered trademarks and trademarks are the property of their respective owners.
TYPICAL APPLICATION Power Supply Ripple Rejection
V+ 120 5V ±5% C LTC6655–2.5 OUTPUT V+ RFAULT 110 4.7µF LT3040 OUTPUT 200k FAULT EN/UV V+ LT3040 100 LTC6655-3.3 IN OUT_F 90 FS SHDN OUT_S CREF RIN 80 2.2µF 5k V QPWR GND IN + 70 OUT QDRV VOUT = 3.3V PSRR (dB) 60 C – I IN OUT(MAX) = 200mA 2.2µF VFB 50 V+ = 4.5V R GND ILIM IN = 5kΩ 40 CIN = 4.7µF C C OUT 30 OUT = 4.7µF RILIM 4.7µF ILOAD = 200mA 499Ω 2010 100 1k 10k 100k 3040 TA01a FREQUENCY (Hz) 3040 TA01b Rev. 0 Document Feedback For more information www.analog.com 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Applications Information Typical Applications Package Description Typical Application Related Parts