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Low Noise Micropower 2.5 V
Precision Voltage Reference
ADR291W
Rev. 0
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FEATURES
Qualified for automotive applications
Supply range
2.8 V to 15 V
Supply current: 15 μA maximum
Low noise: 8 μV (0.1 Hz to 10 Hz)
High output current: 5 mA
Temperature range: −40°C to +125°C
Pin compatible with REF02/REF19x
APPLICATIONS
Automotive Li-Ion Battery Measurement
Analog-to-digital and digital-to-analog converter reference
CONNECTION DIAGRAM
NC 1
V
IN
2
NC 3
GND
4
NC8
NC7
V
OUT
6
NC
5
NC = NO CONNECT
ADR291
TOP VIEW
(Not to Scale)
08554-001
Figure 1. 8-Lead SOIC_N (R-8)
GENERAL DESCRIPTION
The ADR291 is a low noise, micropower precision voltage refer-
ence that uses an XFET® reference circuit. The XFET architecture
offers significant performance improvements over traditional
band gap and buried Zener-based references. Improvements
include one quarter of the voltage noise output of band gap refer-
ences operating at the same current, very low and ultralinear
temperature drift, low thermal hysteresis, and excellent long-
term stability.
The ADR291 is a series voltage reference providing a stable and
accurate output voltage from supplies as low as 2.8 V. The
output voltage is 2.5 V.
Quiescent current is only 12 μA, making these devices ideal for
battery-powered instrumentation. Output accuracy is ±8.3 mV
maximum. Temperature coefficient is 15 ppm/°C maximum.
Line regulation and load regulation are typically 30 ppm/V and
30 ppm/mA, maintaining the overall high performance of the
reference. For a device with 5.0 V output, refer to the ADR293
data sheet.
The ADR291 is specified over the automotive temperature
range of −40°C to +125°C. The device is available in the 8-lead
SOIC package.
Table 1. ADR291 Product Details
Part No.
Output
Voltage (V) Accuracy (±%)
Temperature
Coefficient
(ppm/°C) Max
ADR291 2.500 0.332 15
Verzeichnis
