High Precision Shunt Mode
Voltage References
ADR520/ADR525/ADR530/ADR540/ADR550
FEATURES
PIN CONFIGURATION
Ultracompact SC70 and SOT-23-3 packages
Temperature coefficient: 40 ppm/°C (maximum)
2× the temperature coefficient improvement over the
LM4040
Pin compatible with the LM4040/LM4050
Initial accuracy: 0.2ꢀ
ADR520/
ADR525/
ADR530/
V+
1
3
TRIM
ADR540/
ADR550
V–
2
Figure 1. 3-Lead SC70 (KS) and 3-Lead SOT-23-3 (RT)
Low output voltage noise: 14 μV p-p @ 2.5 V output
No external capacitor required
Operating current range: 50 μA to 15 mA
Industrial temperature range: −40°C to +85°C
GENERAL DESCRIPTION
Designed for space-critical applications, the ADR520/ADR525/
ADR530/ADR540/ADR550 are high precision shunt voltage
references, housed in ultrasmall SC70 and SOT-23-3 packages.
These references feature low temperature drift of 40 ppm/°C,
an initial accuracy of better than 0.2ꢀ, and ultralow output
noise of 14 μV p-p.
APPLICATIONS
Portable, battery-powered equipment
Automotive
Power supplies
Available in output voltages of 2.048 V, 2.5 V, 3.0 V, 4.096 V,
and 5.0 V, the advanced design of the ADR520/ADR525/
ADR530/ADR540/ADR550 eliminates the need for compensa-
tion by an external capacitor, yet the references are stable with
any capacitive load. The minimum operating current increases
from a mere 50 μA to a maximum of 15 mA. This low operating
current and ease of use make these references ideally suited for
handheld, battery-powered applications.
Data acquisition systems
Instrumentation and process control
Energy measurement
Table 1. Selection Guide
Temperature
Coefficient
(ppm/°C)
Initial
Accuracy (ꢀ)
Part
Voltage (V)
2.048
2.048
2.5
2.5
3.0
ADR520A
ADR520B
ADR525A
ADR525B
ADR530A
ADR530B
ADR540A
ADR540B
ADR550A
ADR550B
0.4
0.2
0.4
0.2
0.4
0.2
0.4
0.2
0.4
0.2
70
40
70
40
70
40
70
40
70
40
A trim terminal is available on the ADR520/ADR525/ADR530/
ADR540/ADR550 to allow adjustment of the output voltage
over a 0.5ꢀ range, without affecting the temperature coefficient
of the device. This feature provides users with the flexibility to
trim out any system errors.
3.0
4.096
4.096
5.0
5.0
Rev. E
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