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PDF ( 数据手册 , 数据表 ) ADR1581

零件编号 ADR1581
描述 Precision Shunt Voltage Reference
制造商 Analog Devices
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ADR1581 数据手册, 描述, 功能
1.25 V Micropower, Precision Shunt
Voltage Reference
ADR1581
FEATURES
Wide operating range: 60 μA to 10 mA
Initial accuracy: ±0.12% maximum
Temperature drift: ±50 ppm/°C maximum
Output impedance: 0.5 Ω maximum
Wideband noise (10 Hz to 10 kHz): 20 μV rms
Operating temperature range: −40°C to +85°C
High ESD rating
4 kV human body model
400 V machine model
Compact, surface-mount SOT-23 package
APPLICATIONS
Portable, battery-powered equipment
Cellular phones, notebook computers, PDAs, GPSs,
and DMMs
Computer workstations
Suitable for use with a wide range of video RAMDACs
Smart industrial transmitters
PCMCIA cards
Automotive
3 V/5 V, 8-bit to 12-bit data converters
GENERAL DESCRIPTION
The ADR15811 is a low cost, 2-terminal (shunt), precision band
gap reference. It provides an accurate 1.250 V output for input
currents between 60 μA and 10 mA.
The superior accuracy and stability of the ADR1581 is made
possible by the precise matching and thermal tracking of on-
chip components. Proprietary curvature correction design
techniques have been used to minimize the nonlinearities in
the voltage output temperature characteristics. The ADR1581
is stable with any value of capacitive load.
The low minimum operating current makes the ADR1581 ideal
for use in battery-powered 3 V or 5 V systems. However, the wide
operating current range means that the ADR1581 is extremely
versatile and suitable for use in a wide variety of high current
applications.
The ADR1581 is available in two grades, A and B, both of which
are provided in the SOT-23 package. Both grades are specified
over the industrial temperature range of −40°C to +85°C.
1 Protected by U.S. Patent No. 5,969,657; other patents pending.
PIN CONFIGURATION
ADR1581
V+ 1
3 NC (OR V–)
V– 2
TOP VIEW
NC = NO CONNECT
Figure 1. SOT-23
20
18
16
14
12
10
8
6
4
2
0
–20 –10
0
10
TEMPERATURE DRIFT (ppm/°C)
20
Figure 2. Reverse Voltage Temperature Drift Distribution
100
90
80
70
60
50
40
30
20
10
0
–5 –4 –3 –2 –1 0 1 2 3 4
OUTPUT ERROR (mV)
Figure 3. Reverse Voltage Error Distribution
5
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
©2007 Analog Devices, Inc. All rights reserved.







ADR1581 pdf, 数据表
ADR1581
OUTPUT IMPEDANCE VS. FREQUENCY
Understanding the effect of the reverse dynamic output impedance
in a practical application is important to successfully applying the
ADR1581. A voltage divider is formed by the ADR1581 output
impedance and the external source impedance. When an external
source resistor of about 30 kΩ (IR = 100 μA) is used, 1% of the
noise from a 100 kHz switching power supply is developed at
the output of the ADR1581. Figure 15 shows how a 1 μF load
capacitor connected directly across the ADR1581 reduces the
effect of power supply noise to less than 0.01%.
1k
100
CL = 0
10
ΔIR = 0.1IR
IR = 100µA
1
IR = 1mA
CL = 1µF
0.1
10
100 1k 10k 100k
FREQUENCY (Hz)
Figure 15. Output Impedance vs. Frequency
1M
NOISE PERFORMANCE AND REDUCTION
The noise generated by the ADR1581 is typically less than
5 μV p-p over the 0.1 Hz to 10 Hz band. Figure 16 shows the
0.1 Hz to 10 Hz noise of a typical ADR1581. Noise in a 10 Hz to
10 kHz bandwidth is approximately 20 μV rms (see Figure 17a).
If further noise reduction is desired, a one-pole low-pass filter
can be added between the output pin and ground. A time constant
of 0.2 ms has a −3 dB point at about 800 Hz and reduces the high
frequency noise to about 6.5 μV rms (see Figure 17b). A time
constant of 960 ms has a −3 dB point at 165 Hz and reduces the
high frequency noise to about 2.9 μV rms (see Figure 17c).
4.48µV p-p
40µV/DIV
21µV rms
(a)
20µV/DIV
6.5µV rms, t = 0.2ms
(b)
10µV/DIV
10ms/DIV
2.90µV rms, t = 960ms
(c)
Figure 17. Total RMS Noise
TURN-ON TIME
Many low power instrument manufacturers are becoming
increasingly concerned with the turn-on characteristics of the
components in their systems. Fast turn-on components often
enable the end user to keep power off when not needed, and yet
those components respond quickly when the power is turned
on for operation. Figure 18 displays the turn-on characteristics
of the ADR1581.
Upon application of power (cold start), the time required for the
output voltage to reach its final value within a specified error is
the turn-on settling time. Two components normally associated
with this are time for active circuits to settle and time for thermal
gradients on the chip to stabilize. This characteristic is generated
from cold start operation and represents the true turn-on wave-
form after power-up. Figure 20 shows both the coarse and fine
turn-on settling characteristics of the device; the total settling
time to within 1.0 mV is about 6 μs, and there is no long thermal
tail when the horizontal scale is expanded to 2 ms/div.
2.4V
0V VIN
CL = 200pF
1µV/DIV
TIME (1s/DIV)
Figure 16. 0.1 Hz to 10 Hz Voltage Noise
250mV/DIV
5µs/DIV
Figure 18. Turn-On Response Time
RS = 11.5k
VIN
RL
+
VR
CL VOUT
Figure 19. Turn-On, Settling, and Transient Test Circuit
Rev. 0 | Page 8 of 12














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