ANALOG DEVICES ADR291W Service Manual

Low Noise Micropower 2.5 V

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

GENERAL DESCRIPTION

The ADR291 is a low noise, micropower precision voltage refer­ence 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 refer­ences operating at the same current, very low and ultralinear
temperature drift, low thermal hysteresis, and excellent long­term 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.

Precision Voltage Reference

ADR291W

CONNECTION DIAGRAM

NC 1

ADR291

V

2

IN

TOP VIEW

NC 3

(Not to Scale)

4

GND

NC = NO CONNECT

Figure 1. 8-Lead SOIC_N (R-8)

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

Output

Part No.

Voltage (V) Accuracy (±%)

ADR291 2.500 0.332 15

NC8
NC7
V

6

OUT

5

NC

08554-001

Temperature
Coefficient
(ppm/°C) Max

Rev. 0

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