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Low Power, Precision Reference
and Op Amp
ADR821/ADR827
Rev. 0
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responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
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Tel: 781.329.4700 www.analog.com
Fax: 781.461.3113 ©2007 Analog Devices, Inc. All rights reserved.
FEATURES
10-lead MSOP
400 μA supply current
−40°C to +125°C temperature range
On-board precision resistors
Reference
ADR821: 2.8 V to 15 V operation
ADR827: 2.7 V to 15 V operation
±0.2% initial accuracy
15 ppm/°C temperature drift maximum
+5 mA/−3 mA output drive
Amplifier
ADR821
±2.8 V to ±15 V operation
2.8 V to 15 V single-supply operation
ADR827
±2.7 V to ±15 V operation
2.7 V to 15 V single-supply operation
Rail-to-rail input and output
500 μV offset voltage maximum
50 nA bias current maximum
Unity gain stable
No phase reversal
APPLICATIONS
Battery-powered instrumentation
Portable medical instrumentation
Data acquisition systems
Industrial process controls
Automotive applications
FUNCTIONAL BLOCK DIAGRAM
V+
R
1
G
ND
NC
V–
AMP_OUT
R
2
+IN
–IN
NC = NO CONNECT
06665-001
1
2
3
4
5
10
9
8
7
6
REF
R
1
R
2
REF_OUT
ADR821/ADR827
Figure 1.
Table 1. Selection Table
Part No.
Reference
V
OUT
Reference
Accuracy
Reference
Temperature
Coefficient
ADR827ARMZ 1.25 V ±0.4% 30 ppm/°C
ADR827BRMZ 1.25 V ±0.2% 15 ppm/°C
ADR821ARMZ 2.50 V ±0.4% 30 ppm/°C
ADR821BRMZ 2.50 V ±0.2% 15 ppm/°C
GENERAL DESCRIPTION
The ADR821/ADR827 combines a precision voltage reference
and an op amp in a 10-lead mini small outline package (MSOP).
The reference and the op amp can be operated independently,
offering the user a range of flexibility when arranging the
combination. Featuring a combined operating current of less
than 400 μA and 15 ppm/°C temperature drift on the reference,
the ADR821/ADR827 are ideally suited for applications requir-
ing precision and low power.
Available with the reference at 1.25 V and at 2.5 V, the
ADR821/ADR827 also come in two grades. The reference on
the A grade offers 30 ppm/°C temperature drift performance
and ±0.4% initial accuracy. The B grade provides a tighter
temperature drift performance of 15 ppm/°C and only ±0.2%
initial accuracy. All versions operate from −40°C to +125°C.
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