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Low Power, Precision Reference
and Op Amp
ADR821/ADR827
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
FUNCTIONAL BLOCK DIAGRAM
V+
1
R
1 2
GND
3
NC
4
V–
5
NC = NO CONNECT
REF
ADR821/ADR827
R
1
R
2
10
AMP_OUT
9
8
7
6
R
2
–IN
+IN
REF_OUT
Figure 1.
Table 1. Selection Table
Reference
V
OUT
1.25 V
1.25 V
2.50 V
2.50 V
Reference
Accuracy
±0.4%
±0.2%
±0.4%
±0.2%
Reference
Temperature
Coefficient
30 ppm/°C
15 ppm/°C
30 ppm/°C
15 ppm/°C
Part No.
ADR827ARMZ
ADR827BRMZ
ADR821ARMZ
ADR821BRMZ
APPLICATIONS
Battery-powered instrumentation
Portable medical instrumentation
Data acquisition systems
Industrial process controls
Automotive applications
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.
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
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.
Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2007 Analog Devices, Inc. All rights reserved.
06665-001
ADR821/ADR827
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
ADR821 Electrical Characteristics—Reference ....................... 3
ADR821 Electrical Characteristics—Amplifier
(V
S
= ±2.8 V)................................................................................. 4
ADR821 Electrical Characteristics—Amplifier
(V
S
= ±15 V).................................................................................. 5
ADR827 Electrical Characteristics—Reference ....................... 6
ADR827 Electrical Characteristics—Amplifier
(V
S
= ±2.7 V)................................................................................. 7
ADR827 Electrical Characteristics—Amplifier
(V
S
= ±15 V).................................................................................. 8
Absolute Maximum Ratings ............................................................9
Thermal Resistance .......................................................................9
ESD Caution...................................................................................9
Pin Configuration and Function Descriptions........................... 10
Typical Performance Characteristics ........................................... 11
Reference ..................................................................................... 11
Amplifier (AD821/AD827)....................................................... 15
Applications Information .............................................................. 18
+2.5 V and −2.5 V Outputs (ADR821) ................................... 18
2.5 V and 5.0 V Outputs (ADR821)......................................... 18
Multiple 2.5 V Outputs (ADR821)........................................... 18
Outline Dimensions ....................................................................... 19
Ordering Guide .......................................................................... 19
REVISION HISTORY
10/07—Revision 0: Initial
Version
Rev. 0 | Page 2 of 20
ADR821/ADR827
SPECIFICATIONS
ADR821 ELECTRICAL CHARACTERISTICS—REFERENCE
V
IN
= 2.8 V to 15 V, T
A
= 25°C, C
IN
= C
OUT
= 0.1 μF, unless otherwise noted.
Table 2.
Parameter
OUTPUT VOLTAGE
A Grade
B Grade
INITIAL ACCURACY
A Grade
B Grade
TEMPERATURE COEFFICIENT
A Grade
B Grade
DROPOUT (V
OUT
– V
IN
)
LINE REGULATION
LOAD REGULATION
TCV
OUT
−40°C < T
A
< +125°C
30
15
0.3
50
400
200
600
300
ppm/°C
ppm/°C
V
ppm/V
ppm/mA
ppm/mA
ppm/mA
ppm/mA
μV p-p
μV p-p
μs
μA
μA
kΩ
%
ppm/°C
Symbol
V
OUT
Conditions
Min
2.490
2.495
V
OERR
10
0.40
5.00
0.20
mV
%
mV
%
Typ
2.500
2.500
Max
2.510
2.505
Unit
V
V
V
DO
∆V
OUT
/∆V
IN
∆V
OUT
/∆I
LOAD
VOLTAGE NOISE
BROADBAND NOISE
TURN-ON SETTLING TIME
POWER SUPPLY
Positive Supply Current
Negative Supply Current
ON-BOARD RESISTORS
Resistor Tolerance
Resistor Matching
Resistor Temperature Coefficient
e
N p-p
t
R
I
SY+
I
SY−
R
1
, R
2
I
OUT
= 0 mA
V
IN
= 2.8 V to 15 V, −40°C < T
A
< +125°C
I
LOAD
= 0 mA to 5 mA, −40°C < T
A
< +125°C,
V
IN
= 5 V
I
LOAD
= 0 mA to 5 mA, V
IN
= 5 V
I
LOAD
= −3 mA to 0 mA, −40°C < T
A
< +125°C,
V
IN
= 5 V
I
LOAD
= −3 mA to +5 mA, V
IN
= 5 V
0.1 Hz to 10 Hz
10 Hz to 10 kHz
C
IN
= 0 μF
No load, −40°C < T
A
< +125°C
No load, −40°C < T
A
< +125°C
8
20
80
80
16
430
80
400
300
10
0.5
±100
12
TC
Rev. 0 | Page 3 of 20
ADR821/ADR827
ADR821 ELECTRICAL CHARACTERISTICS—AMPLIFIER (V
S
= ±2.8 V)
V
CM
= 0 V, T
A
= 25°C, unless otherwise noted.
Table 3.
Parameter
INPUT CHARACTERISTICS
Input Offset Voltage
Input Offset Voltage Drift
Input Bias Current
Input Offset Bias Current
Large Signal Voltage Gain
Symbol
V
OS
TCV
OS
I
B
I
OS
A
VO
Conditions
−40°C < T
A
< +125°C
−40°C < T
A
< +125°C
−40°C < T
A
< +125°C
−40°C < T
A
< +125°C
V
OUT
= −1.5 V to +1.5 V
R
LOAD
= 10 kΩ, −40°C < T
A
< +125°C
R
LOAD
= 2 kΩ, −40°C < T
A
< +125°C
V
CM
= −1.5 V to +1.5 V, −40°C < T
A
< +125°C
Min
Typ
100
2
15
5
99
94
75
85
2.6
2.55
108
100
100
Max
500
5
50
25
Unit
μV
μV/°C
nA
nA
dB
dB
dB
dB
V
V
V
V
μA
μA
dB
V/μs
MHz
Degrees
μV p-p
nV/√Hz
Common-Mode Rejection Ratio
OUTPUT CHARACTERISTICS
Output Voltage High
Output Voltage Low
POWER SUPPLY
Positive Supply Current
Negative Supply Current
Power Supply Rejection Ratio
DYNAMIC PERFORMANCE
Slew Rate
Gain Bandwidth Product
Phase Margin
NOISE PERFORMANCE
Voltage Noise
Voltage Noise Density
CMRR
V
OH
V
OL
I
LOAD
= 1 mA
I
LOAD
= 1 mA, −40°C < T
A
< +125°C
I
LOAD
= 1 mA
I
LOAD
= 1 mA, −40°C < T
A
< +125°C
No load, −40°C < T
A
< +125°C
No load, −40°C < T
A
< +125°C
V
S
= ±2.8 V to ±15 V
R
LOAD
= 10 kΩ, C
LOAD
= 10 pF, A
V
= +1
C
LOAD
= 14 pF
C
LOAD
= 14 pF
f = 0.1 Hz to 10 Hz
f = 1 kHz
2.7
−2.7
−2.6
−2.55
400
300
I
SY+
I
SY−
PSRR
SR
GBP
φ
M
e
N p-p
e
N
75
100
0.5
1.0
72.5
0.2
16
Rev. 0 | Page 4 of 20
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