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High Precision Shunt Mode
Voltage References
ADR520/ADR525/ADR530/ADR540/ADR550
Rev. E
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FEATURES
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: ±0.2%
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
APPLICATIONS
Portable, battery-powered equipment
Automotive
Power supplies
Data acquisition systems
Instrumentation and process control
Energy measurement
Table 1. Selection Guide
Part Voltage (V)
Initial
Accuracy (%)
Temperature
Coefficient
(ppm/°C)
ADR520A 2.048 ±0.4 70
ADR520B 2.048 ±0.2 40
ADR525A 2.5 ±0.4 70
ADR525B 2.5 ±0.2 40
ADR530A 3.0 ±0.4 70
ADR530B 3.0 ±0.2 40
ADR540A 4.096 ±0.4 70
ADR540B 4.096 ±0.2 40
ADR550A 5.0 ±0.4 70
ADR550B 5.0 ±0.2 40
PIN CONFIGURATION
ADR520/
ADR525/
ADR530/
ADR540/
ADR550
V
+
1
V–
2
TRIM
3
04501-001
Figure 1. 3-Lead SC70 (KS) and 3-Lead SOT-23-3 (RT)
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 ±0.2%, and ultralow output
noise of 14 μV p-p.
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.
A trim terminal is available on the ADR520/ADR525/ADR530/
ADR540/ADR550 to allow adjustment of the output voltage
over a ±0.5% range, without affecting the temperature coefficient
of the device. This feature provides users with the flexibility to
trim out any system errors.
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