1.25 V Micropower, Precision Shunt
Voltage Reference
ADR1581
PIN CONFIGURATION
FEATURES
Wide operating range: 60 μA to 10 mA
Initial accuracy: ±0.12ꢀ maximum
Temperature drift: ±±0 ppm/°C maximum
Output impedance: 0.± Ω maximum
Wideband noise (10 Hz to 10 kHz): 20 μV rms
Operating temperature range: −40°C to +8±°C
High ESD rating
ADR1581
V+
V–
1
3
NC (OR V–)
2
TOP VIEW
NC = NO CONNECT
Figure 1. SOT-23
4 kV human body model
400 V machine model
Compact, surface-mount SOT-23 package
20
18
16
APPLICATIONS
14
12
Portable, battery-powered equipment
Cellular phones, notebook computers, PDAs, GPSs,
and DMMs
10
8
Computer workstations
6
Suitable for use with a wide range of video RAMDACs
Smart industrial transmitters
PCMCIA cards
4
2
Automotive
3 V/± V, 8-bit to 12-bit data converters
0
–20
–10
0
10
20
TEMPERATURE DRIFT (ppm/°C)
GENERAL DESCRIPTION
Figure 2. Reverse Voltage Temperature Drift Distribution
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.
100
90
80
70
60
50
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.
40
30
20
10
0
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.
–5
–4
–3
–2
–1
0
1
2
3
4
5
OUTPUT ERROR (mV)
Figure 3. Reverse Voltage Error Distribution
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.
Rev. 0
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