LT3040 DAC/Reference Buffer Datasheet

LT3040 Datasheet, PDF, Equivalent


Part Number

LT3040

Description

Ultrahigh PSRR Precision DAC/Reference Buffer

Manufacture

Analog Devices

Total Page 30 Pages
Datasheet
Download LT3040 Datasheet


LT3040
LT3040
20V, 200mA, Ultralow Noise, Ultrahigh PSRR
Precision DAC/Reference Buffer
FEATURES
nn Ultralow Wideband Noise: 1.2µVRMS (10Hz to
100kHz)
nn Ultralow 1/f Noise: 0.6µVP-P (0.1Hz to 10Hz)
nn Ultralow Spot Noise: 4nV/√Hz at 1kHz and Above
nn Ultrahigh PSRR: 73dB at 1MHz
nn Ultralow Input Offset: 125µV
nn Output Source Current: 200mA
nn Wide Input Voltage Range: 1.8V to 20V
nn Rail to Rail Output Voltage Range: 0V to 15V
nn Single Capacitor Improves Noise and PSRR
nn Fast Start-Up for VIN Pin
nn FAULT Flag
nn High Bandwidth: 1MHz
nn Low Dropout Voltage: 350mV
nn Programmable Current Limit
nn Precision Enable/UVLO
nn Parallelable for Lower Noise and Higher Current
nn Internal Current Limit with Foldback
nn Minimum Output Capacitor: 4.7µF Ceramic
nn Reverse Supply and Reverse Current Protection
nn Thermal Limit with Hysteresis
nn 10-Lead 3mm × 3mm DFN and 12-Lead MSOP
APPLICATIONS
nn High Speed/High Precision Data Converters
nn High Precision Voltage References
nn Very Low Noise Instrumentation
DESCRIPTION
The LT®3040 is a high performance, robust Voltage Output
Reference/DAC 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 fea-
tures ADI’s ultralow noise and ultrahigh PSRR architec-
ture 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, very low wideband noise, excellent PSRR over a
wide frequency range and low dropout performance – a
typical 350mV dropout at 200mA of source current.
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. Ad-
ditionally, the buffer features 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 volt-
age 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.
All registered trademarks and trademarks are the property of their respective owners.
TYPICAL APPLICATION
V+
5V ±5%
CV+
4.7µF
LTC6655-3.3
IN OUT_F
SHDN OUT_S
GND
RFAULT
200k
FAULT EN/UV
V+
LT3040
CREF
2.2µF
RIN
5k
FS
VIN +
CIN
2.2µF
QPWR
QDRV OUT
VFB
GND ILIM
VOUT = 3.3V
IOUT(MAX) = 200mA
RILIM
499Ω
COUT
4.7µF
3040 TA01a
Document Feedback
For more information www.analog.com
Power Supply Ripple Rejection
120
110
LTC6655–2.5 OUTPUT
LT3040 OUTPUT
100
90
80
70
60
50 V+ = 4.5V
40
RIN = 5kΩ
CIN = 4.7µF
30
20
COUT = 4.7µF
ILOAD = 200mA
10 100
1k
10k
FREQUENCY (Hz)
100k
3040 TA01b
Rev. 0
1

LT3040
LT3040
ABSOLUTE MAXIMUM RATINGS
(Note 1)
V+ Pin Voltage ........................................................ ±22V
EN/UV Pin Voltage ................................................. ±22V
V+-to-EN/UV Differential Voltage............................ ±22V
FAULT Pin Voltage (Note 10)...........................–0.3V, 22V
ILIM Pin Voltage (Note 10) .............................. –0.3V, 1V
VIN Pin Voltage (Note 10) .............................. –0.3V, 16V
VIN Pin Current (Note 7) ..................................... ±20mA
VFB Pin Voltage (Note 10) ............................. –0.3V, 16V
VFB Pin Current (Note 7) .................................... ±20mA
OUT Pin Voltage (Note 10) ............................ –0.3V, 16V
OV+U-Tto-t-oO-UVTFBDDififfefererenntitaial l...(.N..o..t..e..1..4..)......................................................
±1.2V
±22V
V+-to-VFB Differential ............................................. ±22V
FS Pin Voltage (Note 10) ............................... –0.3V, 16V
Output Short-Circuit Duration ......................... Indefinite
Operating Junction Temperature Range (Note 9)
E-Grade, I-Grade ............................... –40°C to 125°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
MSE Package ................................................... 300°C
PIN CONFIGURATION
V+
V+
EN/UV
FAULT
ILIM
1
2
3
4
5
TOP VIEW
10 OUT
9 VFB
8 GND
7 VIN
6 FS
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 43°C/W, θJC = 5.5°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
V+ 1
V+ 2
V+ 3
EN/UV 4
FAULT 5
ILIM 6
TOP VIEW
12 OUT
11 OUT
10 VFB
9 GND
8 VIN
7 FS
MSE PACKAGE
12-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 28°C/W, θJC = 6°C/W
EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT3040EMSE#PBF
LT3040EMSE#TRPBF 3040
12-Lead Plastic MSOP
–40°C to 125°C
LT3040IMSE#PBF
LT3040IMSE#TRPBF
3040
12-Lead Plastic MSOP
–40°C to 125°C
LT3040EDD#PBF
LT3040EDD#TRPBF
LHGM
10-Lead (3mm × 3mm) Plastic DFN
–40°C to 125°C
LT3040IDD#PBF
LT3040IDD#TRPBF
LHGM
10-Lead (3mm × 3mm) Plastic DFN
–40°C to 125°C
Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.
Rev. 0
2 For more information www.analog.com


Features LT3040 20V, 200mA, Ultralow Noise, Ultra high PSRR Precision DAC/Reference Buffe r FEATURES nn Ultralow Wideband Noise: 1.2µVRMS (10Hz to 100kHz) nn Ultralow 1/f Noise: 0.6µVP-P (0.1Hz to 10Hz) n n Ultralow Spot Noise: 4nV/√Hz at 1kH z and Above nn Ultrahigh PSRR: 73dB at 1MHz nn Ultralow Input Offset: 125µV n n Output Source Current: 200mA nn Wide Input Voltage Range: 1.8V to 20V nn Rai l to Rail Output Voltage Range: 0V to 1 5V nn Single Capacitor Improves Noise a nd PSRR nn Fast Start-Up for VIN Pin nn FAULT Flag nn High Bandwidth: 1MHz nn Low Dropout Voltage: 350mV nn Programma ble Current Limit nn Precision Enable/U VLO nn Parallelable for Lower Noise and Higher Current nn Internal Current Lim it with Foldback nn Minimum Output Capa citor: 4.7µF Ceramic nn Reverse Supply and Reverse Current Protection nn Ther mal Limit with Hysteresis nn 10-Lead 3m m × 3mm DFN and 12-Lead MSOP APPLICATI ONS nn High Speed/High Precision Data C onverters nn High Precision Voltage References nn Very Low Noise Instr.
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