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PDF LT6657 Data sheet ( Hoja de datos )
| Número de pieza | LT6657 | |
| Descripción | Buffered Reference | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Features
nn Low Drift
nn A Grade: 1.5ppm/°C Max
nn B Grade: 3ppm/°C Max
nn Low Noise:
nn 0.5ppmP-P (0.1Hz to 10Hz)
nn 0.8ppmRMS (10Hz to 1kHz)
nn Wide Supply Range to 40V
nn Sources and Sinks 10mA Min
nn Line Regulation: 0.2ppm/V
nn Load Regulation: 0.7ppm/mA
nn Reverse Supply Protection
nn Reverse Output Protection
nn Low Power Shutdown: <4µA Max
nn Thermal Protection
nn Can Operate in Shunt Mode
nn Configurable as a Negative Reference
nn Available Output Voltage Options: 2.5V, 3V, 5V
nn MSOP-8 Package
Applications
nn High Temperature Industrial
nn High Resolution Data Acquisition Systems
nn Instrumentation and Process Control
nn Automotive Control and Monitoring
nn Medical Equipment
nn Shunt and Negative Voltage References
LT6657
1.5ppm/°C Drift, Low Noise,
Buffered Reference
Description
The LT®6657 is a precision voltage reference that combines
robust operating characteristics with extremely low drift
and low noise. With advanced curvature compensation,
this bandgap reference achieves 1.5ppm/°C drift with
predictable temperature behavior, and an initial voltage
accuracy of 0.1%. It also offers 0.5ppmP-P noise and very
low temperature cycling hysteresis.
The LT6657 is a low dropout reference that can be powered
from as little as 50mV above the output voltage, up to 40V.
The buffered output supports ±10mA of output drive with
low output impedance and precise load regulation. The
high sink current capability allows operation as a negative
voltage reference with the same precision as a positive
reference. This part is safe under reverse battery condi-
tions, and includes current protection when the output is
short-circuited and thermal shutdown for overload condi-
tions. A shutdown is included to allow power reduction
while enabling a quick turn-on.
The LT6657 is fully specified over the temperature range of
–40°C to 125°C. It is available in the 8-lead MSOP package.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Typical Application
Basic Connection
(VOUT + 50mV) < VIN < 40V
2 IN
CIN 3 SHDN
0.1µF
LT6657
GND
4
OUT 6
VOUT
COUT
1µF
6657 TA01a
Output Voltage Temperature Drift
200
THREE TYPICAL PARTS
100
1ppm/°C BOX
0
–100
–200
–45 –20
5 30 55 80
TEMPERATURE (°C)
105 130
6657 TA01b
For more information www.linear.com/LT6657
6657fb
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1 page  
LT6657
Typical Performance Characteristics
VIN = VOUT + 0.5V, VSHDN = 1.6V, IOUT = 0, COUT = 1µF, unless otherwise noted.
The test conditions are TA = 25°C,
2.5V Output Voltage
Temperature Drift
2.5008
THREE TYPICAL PARTS
2.5004
2.5V Low Frequency 0.1Hz to
10Hz Noise
2.5V Output Voltage Noise
Spectrum
110
COUT = 1µF Cer
100
COUT = 5µF Cer
COUT = 47µF Tant
90
2.5000
80
2.4996
70
60
2.4992
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
6657 G01
TIME (1s/DIV)
6657 G02
50
0.01
0.1 1 10
FREQUENCY (kHz)
100
6657 G03
2.5V Integrated Noise
10Hz to 10kHz
100 COUT = 1µF
10
1
0.1
0.01
0.1 1
FREQUENCY (kHz)
10
6657 G04
2.5V Supply Current vs
Input Voltage
2.0
VSHDN = VIN
1.5
1.0
0.5
125°C
0.0 25°C
–40°C
–55°C
–0.5
–40 –30 –20 –10 0 10 20 30 40
INPUT VOLTAGE (V)
6657 G05
2.5V Line Regulation
2.5010
PART SELF HEATING
IS INCLUDED
2.5005
125°C
25°C
–40°C
2.5000
2.4995
2.4990
0
10 20 30
INPUT VOLTAGE (V)
40
6657 G06
2.5V Load Regulation (Sourcing)
30
MS8 PACKAGE PART SELF
HEATING IS INCLUDED
20
10
0
–10
–20
–30
0.1
125°C
25°C
–40°C
–55°C
1
OUTPUT CURRENT (mA)
10
6657 G07
2.5V Load Regulation (Sinking)
30
MS8 PACKAGE PART SELF
HEATING IS INCLUDED
20
10
0
–10
–20
–30
0.1
125°C
25°C
–40°C
–55°C
1
OUTPUT CURRENT (mA)
10
6657 G08
2.5V Minimum VIN to VOUT
Differential (Sourcing)
10
1
0.1
0
125°C
25°C
–40°C
–55°C
100 200 300 400 500
INPUT-OUTPUT VOLTAGE (mV)
6657 G09
For more information www.linear.com/LT6657
6657fb
5
5 Page 
LT6657
Applications Information
Figure 6 and 7 shows the load transient response to a
5mA current step both sourcing and sinking.
IOUT
5mA
4mA
IOUT
0mA
5mA
VOUT
10mV/DIV/AC
2.5V/DC
COUT = 1µF
50µs/DIV
6657 F06
Figure 6. Output Response with a 5mA Load Step Sourcing
VOUT
2mV/DIV/AC
2.5VDC
COUT = 1µF
50µs/DIV
6657 F09
Figure 9. Output Response with a 4mA to 5mA Load Step Sinking
Figures 10 and 11 show the load transient response to an
even smaller 0.5mA current step both sourcing and sinking.
IOUT
5mA
0mA
VOUT
10mV/DIV/AC
2.5VDC
COUT = 1µF
50µs/DIV
6657 F07
Figure 7. Output Response with a 5mA Load Step Sinking
Figure 8 and 9 shows the load transient response to a
smaller 4mA to 5mA current step while sourcing and sinking.
IOUT
4mA
5mA
VOUT
2mV/DIV/AC
2.5V/DC
COUT = 1µF
50µs/DIV
6657 F08
Figure 8. Output Response with a 4mA to 5mA Load Step Sourcing
IOUT
0mA
0.5mA
VOUT
2mV/DIV/AC
2.5V/DC
COUT = 1µF
50µs/DIV
6657 F10
Figure 10. Output Response with a 0.5mA Load Step Sourcing
IOUT
0.5mA
0mA
VOUT
2mV/DIV/AC
2.5V/DC
COUT = 1µF
50µs/DIV
6657 F11
Figure 11. Output Response with a 0.5mA Load Step Sinking
For more information www.linear.com/LT6657
6657fb
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11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet LT6657.PDF ] | |
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