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PDF ( 数据手册 , 数据表 ) ADR127

零件编号 ADR127
描述 (ADR121 - ADR127) Micropower LDO Voltage References
制造商 Analog Devices
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ADR127 数据手册, 描述, 功能
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Precision, Micropower LDO Voltage
References in TSOT
ADR121/ADR125/ADR127
FEATURES
Initial accuracy
A grade: ±0.24%
B grade: ±0.12%
Maximum tempco
A grade: 25 ppm/°C
B grade: 9 ppm/°C
Low dropout: 300 mV for ADR121, ADR125
High output current: +5 mA/−2 mA
Low typical operating current: 85 μA
Input range: 2.7 V to 18 V
Temperature range: −40°C to +125°C
Tiny TSOT (UJ-6) package
APPLICATIONS
Battery-powered instrumentation
Portable medical equipment
Data acquisition systems
Automotive
GENERAL DESCRIPTION
The ADR121/ADR125/ADR127 are a family of micropower,
high precision, series mode, band gap references with sink and
source capability. The parts feature high accuracy and low
power consumption in a tiny package. The ADR12x design
includes a patented temperature drift curvature correction
technique that minimizes the nonlinearities in the output
voltage vs. temperature characteristics.
PIN CONFIGURATION
NC1 1
6 NC1
ADR12x
GND 2 TOP VIEW 5 NC1
(Not to Scale)
VIN 3
4 VOUT
NC = NO CONNECT
1 MUST BE LEFT FLOATING
Figure 1.
The ADR12x is a low dropout voltage reference, requiring only
300 mV for ADR121/ADR125 and 1.45 V for ADR127 above
the nominal output voltage on the input to provide a stable
output voltage. This low dropout performance coupled with the
low 85 μA operating current makes the ADR12x ideal for
battery-powered applications.
Available in an extended industrial temperature range of −40°C
to +125°C, the ADR12x is housed in the tiny TSOT (UJ-6)
package.
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2006 Analog Devices, Inc. All rights reserved.







ADR127 pdf, 数据表
ADR121/ADR125/ADR127
TYPICAL PERFORMANCE CHARACTERISTICS
1.256
1.254
1.252
1.250
1.248
1.246
1.244
–40 –25 –10 5 20 35 50 65 80 95
TEMPERATURE (°C)
Figure 2. ADR127 VOUT vs. Temperature
110 125
2.510
2.508
2.506
2.504
2.502
2.500
2.498
2.496
2.494
2.492
2.490
–40 –25 –10 5 20 35 50 65 80 95
TEMPERATURE (°C)
Figure 3. ADR121 VOUT vs. Temperature
110 125
5.020
5.015
5.010
5.005
5.000
4.995
4.990
4.985
4.980
–40 –25 –10 5 20 35 50 65 80 95
TEMPERATURE (°C)
Figure 4. ADR125 VOUT vs. Temperature
110 125
5
4
3
2
1
0
–50 –40 –30 –20 –10 0
10 20 30 40
TEMPERATURE COEFFICIENT (ppm/°C)
Figure 5. ADR127 Temperature Coefficient
50
5
4
3
2
1
0
–50 –40 –30 –20 –10 0
10 20 30 40
TEMPERATURE COEFFICIENT (ppm/°C)
Figure 6. ADR125 Temperature Coefficient
50
5
4
3
2
1
0
–50 –40 –30 –20 –10 0
10 20 30 40
TEMPERATURE COEFFICIENT (ppm/°C)
Figure 7. ADR121 Temperature Coefficient
50
Rev. 0 | Page 8 of 20







ADR127 equivalent, schematic
ADR121/ADR125/ADR127
THEORY OF OPERATION
The ADR12x band gap references are the high performance
solution for low supply voltage and low power applications. The
uniqueness of these products lies in their architecture.
POWER DISSIPATION CONSIDERATIONS
The ADR12x family is capable of delivering load currents to
5 mA with an input range from 3.0 V to 18 V. When this device
is used in applications with large input voltages, care must be
taken to avoid exceeding the specified maximum power
dissipation or junction temperature, because this could result in
premature device failure.
Use the following formula to calculate a device’s maximum
junction temperature or dissipation:
PD
=
TJ TA
θJA
where:
TJ is the junction temperature.
TA is the ambient temperature.
PD is the device power dissipation.
θJA is the device package thermal resistance.
NOTES
Input Capacitor
Input capacitors are not required on the ADR12x. There is no
limit for the value of the capacitor used on the input, but a 1 μF
to 10 μF capacitor on the input improved transient response in
the applications where there is a sudden supply change. An
additional 0.1 μF capacitor in parallel also helps reduce noise
from the supply.
Output Capacitor
The ADR12x requires a small 0.1 μF capacitor for stability.
Additional 0.1 μF to 10 μF capacitance in parallel can improve
load transient response. This acts as a source of stored energy
for a sudden increase in load current. The only parameter
affected with the additional capacitance is turn-on time.
Rev. 0 | Page 16 of 20










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