ANALOG DEVICES ADR827 Service Manual
Low Power, Precision Reference
G
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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
and Op Amp
ADR821/ADR827
FUNCTIONAL BLOCK DIAGRAM
ADR821/ADR827
1
V+
R
2
1
3
4
5
NC = NO CONNECT
1
REF
Figure 1.
R
ND
NC
V–
Table 1. Selection Table
Reference
Part No.
V
OUT
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
10
R
2
9
8
7
6
Reference
Accuracy
AMP_OUT
R
2
–IN
+IN
REF_OUT
Reference
Temperature
Coefficient
06665-001
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 requiring precision and low power.
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Anal og Devices for its use, nor for any infringements of patents or ot her
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.
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.
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.
ADR821/ADR827
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TABLE OF CONTENTS
Features.............................................................................................. 1
Absolute Maximum Ratings ............................................................9
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
ADR821 Electrical Characteristics—Reference ....................... 3
ADR821 Electrical Characteristics—Amplifier
(V
= ±2.8 V)................................................................................. 4
S
ADR821 Electrical Characteristics—Amplifier
(V
= ±15 V).................................................................................. 5
S
ADR827 Electrical Characteristics—Reference ....................... 6
ADR827 Electrical Characteristics—Amplifier
(V
= ±2.7 V)................................................................................. 7
S
ADR827 Electrical Characteristics—Amplifier
(V
= ±15 V).................................................................................. 8
S
REVISION HISTORY
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
10/07—Revision 0: Initial Version
Rev. 0 | Page 2 of 20
ADR821/ADR827
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SPECIFICATIONS
ADR821 ELECTRICAL CHARACTERISTICS—REFERENCE
VIN = 2.8 V to 15 V, TA = 25°C, C
Table 2.
Parameter Symbol Conditions Min Typ Max Unit
OUTPUT VOLTAGE V
A Grade 2.490 2.500 2.510 V
B Grade 2.495 2.500 2.505 V
INITIAL ACCURACY V
A Grade 10 mV
0.40 %
B Grade 5.00 mV
0.20 %
TEMPERATURE COEFFICIENT TCV
A Grade 30 ppm/°C
B Grade 15 ppm/°C
DROPOUT (V
– VIN) VDO I
OUT
LINE REGULATION ∆V
LOAD REGULATION ∆V
I
I
VOLTAGE NOISE e
BROADBAND NOISE 10 Hz to 10 kHz 430 μV p-p
TURN-ON SETTLING TIME tR C
POWER SUPPLY
Positive Supply Current I
Negative Supply Current I
ON-BOARD RESISTORS R1, R2
Resistor Tolerance 8 10 12 kΩ
Resistor Matching 0.5 %
Resistor Temperature Coefficient TC ±100 ppm/°C
= C
IN
= 0.1 μF, unless otherwise noted.
OUT
OUT
OERR
−40°C < TA < +125°C
OUT
= 0 mA 0.3 V
OUT
/∆VIN VIN = 2.8 V to 15 V, −40°C < TA < +125°C 20 50 ppm/V
OUT
/∆I
= 0 mA to 5 mA, −40°C < TA < +125°C,
LOAD
I
LOAD
V
= 5 V
IN
= 0 mA to 5 mA, VIN = 5 V 80 200 ppm/mA
LOAD
= −3 mA to 0 mA, −40°C < TA < +125°C,
I
LOAD
V
= 5 V
IN
= −3 mA to +5 mA, VIN = 5 V 80 300 ppm/mA
LOAD
= 0 μF 80 μs
IN
OUT
0.1 Hz to 10 Hz 16 μV p-p
N p-p
No load, −40°C < TA < +125°C 400 μA
SY+
No load, −40°C < TA < +125°C 300 μA
SY−
400 ppm/mA
600 ppm/mA
Rev. 0 | Page 3 of 20
ADR821/ADR827
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ADR821 ELECTRICAL CHARACTERISTICS—AMPLIFIER (VS = ±2.8 V)
VCM = 0 V, TA = 25°C, unless otherwise noted.
Table 3.
Parameter Symbol Conditions Min Typ Max Unit
INPUT CHARACTERISTICS
Input Offset Voltage VOS −40°C < TA < +125°C 100 500 μV
Input Offset Voltage Drift TCVOS −40°C < TA < +125°C 2 5 μV/°C
Input Bias Current IB −40°C < TA < +125°C 15 50 nA
Input Offset Bias Current IOS −40°C < TA < +125°C 5 25 nA
Large Signal Voltage Gain AVO V
R
R
Common-Mode Rejection Ratio CMRR VCM = −1.5 V to +1.5 V, −40°C < TA < +125°C 75 100 dB
85 dB
OUTPUT CHARACTERISTICS
Output Voltage High VOH I
I
Output Voltage Low VOL I
I
POWER SUPPLY
Positive Supply Current I
Negative Supply Current I
No load, −40°C < TA < +125°C 400 μA
SY+
No load, −40°C < TA < +125°C 300 μA
SY−
Power Supply Rejection Ratio PSRR VS = ±2.8 V to ±15 V 75 100 dB
DYNAMIC PERFORMANCE
Slew Rate SR R
Gain Bandwidth Product GBP C
Phase Margin φM C
NOISE PERFORMANCE
Voltage Noise e
f = 0.1 Hz to 10 Hz 0.2 μV p-p
N p-p
Voltage Noise Density eN f = 1 kHz 16 nV/√Hz
= −1.5 V to +1.5 V
OUT
= 10 kΩ, −40°C < TA < +125°C 99 108 dB
LOAD
= 2 kΩ, −40°C < TA < +125°C 94 100 dB
LOAD
= 1 mA 2.6 2.7 V
LOAD
= 1 mA, −40°C < TA < +125°C 2.55 V
LOAD
= 1 mA −2.7 −2.6 V
LOAD
= 1 mA, −40°C < TA < +125°C −2.55 V
LOAD
= 10 kΩ, C
LOAD
= 14 pF 1.0 MHz
LOAD
= 14 pF 72.5 Degrees
LOAD
= 10 pF, AV = +1 0.5 V/μs
LOAD
Rev. 0 | Page 4 of 20
ADR821/ADR827
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ADR821 ELECTRICAL CHARACTERISTICS—AMPLIFIER (VS = ±15 V)
VCM= 0 V, TA = 25°C, unless otherwise noted.
Table 4.A
Parameter Symbol Conditions Min Typ Max Unit
INPUT CHARACTERISTICS
Input Offset Voltage VOS −40°C < TA < +125°C 100 500 μV
Input Offset Voltage Drift TCVOS −40°C < TA < +125°C 2 5 μV/oC
Input Bias Current IB −40°C < TA < +125°C 10 50 nA
Input Offset Bias Current IOS −40°C < TA < +125°C 5 25 nA
Large Signal Voltage Gain AVO V
R
R
Common-Mode Rejection Ratio CMRR VCM = −14 V to +14 V, −40°C < TA < +125°C 75 100 dB
85 dB
OUTPUT CHARACTERISTICS
Output Voltage high VOH I
I
Output Voltage Low VOL I
I
Output Current ISC Short-circuit current ±20 mA
POWER SUPPLY
Positive Supply Current I
Negative Supply Current I
No load, −40°C < TA < +125°C 400 μA
SY+
No load, −40°C < TA < +125°C 300 μA
SY−
Power Supply Rejection Ratio PSRR VS = ±2.8 V to ±15 V 75 100 dB
DYNAMIC PERFORMANCE
Slew Rate SR R
Gain Bandwidth Product GBP C
Phase Margin φM C
NOISE PERFORMANCE
Voltage Noise e
f = 0.1 Hz to 10 Hz 0.2 μV p-p
N p-p
Voltage Noise Density eN f = 1 kHz 16 nV/√Hz
= −14 V to +14 V
OUT
= 10 kΩ, −40°C < TA < +125°C 109.5 118 dB
LOAD
= 2 kΩ, −40°C < TA < +125°C 100 111 dB
LOAD
= 1 mA 14.8 14.9 V
LOAD
= 1 mA, −40°C < TA < +125°C 14.75 V
LOAD
= 1 mA −14.9 −14.8 V
LOAD
= 1 mA, −40°C < TA < +125°C −14.75 V
LOAD
= 10 kΩ, C
LOAD
= 14 pF 1.0 MHz
LOAD
= 14 pF 75.4 Degrees
LOAD
= 10 pF, AV = +1 0.5 V/μs
LOAD
Rev. 0 | Page 5 of 20
ADR821/ADR827
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ADR827 ELECTRICAL CHARACTERISTICS—REFERENCE
VIN = 2.7 V to 15 V, TA = 25°C, C
Table 5.
Parameter Symbol Conditions Min Typ Max Unit
OUTPUT VOLTAGE V
A Grade
B Grade 1.2475 1.250 1.2525 V
INITIAL ACCURACY V
A Grade
0.40 %
B Grade 2.50 mV
0.20 %
TEMPERATURE COEFFICIENT TCV
A Grade 30 ppm/°C
B Grade 15 ppm/°C
DROPOUT (V
– VIN) V
OUT
LINE REGULATION ∆V
LOAD REGULATION ∆V
I
I
VOLTAGE NOISE e
BROADBAND NOISE 10 Hz to 10 kHz 260 μV p-p
TURN-ON SETTLING TIME tR C
POWER SUPPLY
Positive Supply Current I
Negative Supply Current I
ON-BOARD RESISTORS R1, R2
Resistor Tolerance 8 10 12 kΩ
Resistor Matching 0.5 %
Resistor Temperature Coefficient TC ±100 ppm/°C
= C
IN
= 0.1 μF, unless otherwise noted.
OUT
OUT
OERR
OUT
DO
/∆VIN VIN = 2.7 V to 15 V, −40°C < TA < +125°C 20 50 ppm/V
OUT
/∆I
OUT
0.1 Hz to 10 Hz 8 μV p-p
N p-p
No load, −40°C < TA < +125°C 400 μA
SY+
No load, −40°C < TA < +125°C 300 μA
SY−
1.245 1.250 1.255 V
5 mV
−40°C < TA < +125°C
I
= 0 mA 1.45 V
OUT
LOAD
= 0 mA to 5 mA, −40°C < TA < +125°C,
I
LOAD
V
= 3 V
IN
= 0 mA to 5 mA, VIN = 3 V 80 200 ppm/mA
LOAD
= −3 mA to 0 mA, −40°C < TA < +125°C,
I
LOAD
V
= 3 V
IN
= −3 mA to +5 mA, VIN = 3 V 80 300 ppm/mA
LOAD
= 0 μF, C
IN
= 0.1 μF 80 μs
OUT
400 ppm/mA
600 ppm/mA
Rev. 0 | Page 6 of 20
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