
Low Power, Precision Reference
and Op Amp
ADR821/ADR827
Rev. 0
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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+
R1
GND
NC
V–
AMP_OUT
R2
+IN
–IN
NC = NO CONNECT
06
66
5-
00
1
1
2
3
4
5
10
9
8
7
6
REF
R1
R2
REF_OUT
ADR821/ADR827
Figure 1.
Table 1. Selection Table
Part No.
Reference
VOUT
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.