AD ADR827ARMZ-R21 Low power, precision reference and op amp Datasheet

Low Power, Precision Reference
and Op Amp
ADR821/ADR827
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
R1 2
ADR821/ADR827
R1
R2
GND 3
NC 4
REF
V– 5
10 AMP_OUT
9
R2
8
–IN
7
+IN
6
REF_OUT
NC = NO CONNECT
06665-001
FEATURES
Figure 1.
Table 1. Selection Table
Part No.
ADR827ARMZ
ADR827BRMZ
ADR821ARMZ
ADR821BRMZ
Reference
VOUT
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
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.
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.
ADR821/ADR827
TABLE OF CONTENTS
Features .............................................................................................. 1
Absolute Maximum Ratings ............................................................9
Applications....................................................................................... 1
Thermal Resistance .......................................................................9
Functional Block Diagram .............................................................. 1
ESD Caution...................................................................................9
General Description ......................................................................... 1
Pin Configuration and Function Descriptions........................... 10
Revision History ............................................................................... 2
Typical Performance Characteristics ........................................... 11
Specifications..................................................................................... 3
Reference ..................................................................................... 11
ADR821 Electrical Characteristics—Reference ....................... 3
Amplifier (AD821/AD827)....................................................... 15
ADR821 Electrical Characteristics—Amplifier
(VS = ±2.8 V)................................................................................. 4
Applications Information .............................................................. 18
+2.5 V and −2.5 V Outputs (ADR821) ................................... 18
ADR821 Electrical Characteristics—Amplifier
(VS = ±15 V).................................................................................. 5
2.5 V and 5.0 V Outputs (ADR821)......................................... 18
ADR827 Electrical Characteristics—Reference ....................... 6
Multiple 2.5 V Outputs (ADR821)........................................... 18
ADR827 Electrical Characteristics—Amplifier
(VS = ±2.7 V)................................................................................. 7
Outline Dimensions ....................................................................... 19
Ordering Guide .......................................................................... 19
ADR827 Electrical Characteristics—Amplifier
(VS = ±15 V).................................................................................. 8
REVISION HISTORY
10/07—Revision 0: Initial Version
Rev. 0 | Page 2 of 20
ADR821/ADR827
SPECIFICATIONS
ADR821 ELECTRICAL CHARACTERISTICS—REFERENCE
VIN = 2.8 V to 15 V, TA = 25°C, CIN = COUT = 0.1 μF, unless otherwise noted.
Table 2.
Parameter
OUTPUT VOLTAGE
A Grade
B Grade
INITIAL ACCURACY
A Grade
Symbol
VOUT
Conditions
Min
Typ
Max
Unit
2.490
2.495
2.500
2.500
2.510
2.505
V
V
10
0.40
5.00
0.20
mV
%
mV
%
30
15
0.3
50
400
ppm/°C
ppm/°C
V
ppm/V
ppm/mA
80
200
600
ppm/mA
ppm/mA
80
16
430
80
300
ppm/mA
μV p-p
μV p-p
μs
400
300
μA
μA
12
kΩ
%
ppm/°C
VOERR
B Grade
TEMPERATURE COEFFICIENT
A Grade
B Grade
DROPOUT (VOUT – VIN)
LINE REGULATION
LOAD REGULATION
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
TCVOUT
VDO
∆VOUT/∆VIN
∆VOUT/∆ILOAD
eN p-p
tR
ISY+
ISY−
R1, R2
−40°C < TA < +125°C
IOUT = 0 mA
VIN = 2.8 V to 15 V, −40°C < TA < +125°C
ILOAD = 0 mA to 5 mA, −40°C < TA < +125°C,
VIN = 5 V
ILOAD = 0 mA to 5 mA, VIN = 5 V
ILOAD = −3 mA to 0 mA, −40°C < TA < +125°C,
VIN = 5 V
ILOAD = −3 mA to +5 mA, VIN = 5 V
0.1 Hz to 10 Hz
10 Hz to 10 kHz
CIN = 0 μF
20
No load, −40°C < TA < +125°C
No load, −40°C < TA < +125°C
8
TC
Rev. 0 | Page 3 of 20
10
0.5
±100
ADR821/ADR827
ADR821 ELECTRICAL CHARACTERISTICS—AMPLIFIER (VS = ±2.8 V)
VCM = 0 V, TA = 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
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
Symbol
Conditions
VOS
TCVOS
IB
IOS
AVO
−40°C < TA < +125°C
−40°C < TA < +125°C
−40°C < TA < +125°C
−40°C < TA < +125°C
VOUT = −1.5 V to +1.5 V
RLOAD = 10 kΩ, −40°C < TA < +125°C
RLOAD = 2 kΩ, −40°C < TA < +125°C
VCM = −1.5 V to +1.5 V, −40°C < TA < +125°C
CMRR
VOH
VOL
ILOAD = 1 mA
ILOAD = 1 mA, −40°C < TA < +125°C
ILOAD = 1 mA
ILOAD = 1 mA, −40°C < TA < +125°C
ISY+
ISY−
PSRR
No load, −40°C < TA < +125°C
No load, −40°C < TA < +125°C
VS = ±2.8 V to ±15 V
SR
GBP
φM
eN p-p
eN
Min
Typ
Max
Unit
100
2
15
5
500
5
50
25
μV
μV/°C
nA
nA
99
94
75
85
108
100
100
dB
dB
dB
dB
2.6
2.55
2.7
V
V
V
V
−2.7
−2.6
−2.55
100
μA
μA
dB
RLOAD = 10 kΩ, CLOAD = 10 pF, AV = +1
CLOAD = 14 pF
CLOAD = 14 pF
0.5
1.0
72.5
V/μs
MHz
Degrees
f = 0.1 Hz to 10 Hz
f = 1 kHz
0.2
16
μV p-p
nV/√Hz
Rev. 0 | Page 4 of 20
400
300
75
ADR821/ADR827
ADR821 ELECTRICAL CHARACTERISTICS—AMPLIFIER (VS = ±15 V)
VCM= 0 V, TA = 25°C, unless otherwise noted.
Table 4.A
Parameter
INPUT CHARACTERISTICS
Input Offset Voltage
Input Offset Voltage Drift
Input Bias Current
Input Offset Bias Current
Large Signal Voltage Gain
Common-Mode Rejection Ratio
OUTPUT CHARACTERISTICS
Output Voltage high
Output Voltage Low
Output Current
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
Symbol
Conditions
VOS
TCVOS
IB
IOS
AVO
−40°C < TA < +125°C
−40°C < TA < +125°C
−40°C < TA < +125°C
−40°C < TA < +125°C
VOUT = −14 V to +14 V
RLOAD = 10 kΩ, −40°C < TA < +125°C
RLOAD = 2 kΩ, −40°C < TA < +125°C
VCM = −14 V to +14 V, −40°C < TA < +125°C
CMRR
VOH
ISC
ILOAD = 1 mA
ILOAD = 1 mA, −40°C < TA < +125°C
ILOAD = 1 mA
ILOAD = 1 mA, −40°C < TA < +125°C
Short-circuit current
ISY+
ISY−
PSRR
No load, −40°C < TA < +125°C
No load, −40°C < TA < +125°C
VS = ±2.8 V to ±15 V
SR
GBP
φM
eN p-p
eN
VOL
Min
Typ
Max
Unit
100
2
10
5
500
5
50
25
μV
μV/oC
nA
nA
109.5
100
75
85
118
111
100
dB
dB
dB
dB
14.8
14.75
14.9
V
V
V
V
mA
−14.9
−14.8
−14.75
±20
100
μA
μA
dB
RLOAD = 10 kΩ, CLOAD = 10 pF, AV = +1
CLOAD = 14 pF
CLOAD = 14 pF
0.5
1.0
75.4
V/μs
MHz
Degrees
f = 0.1 Hz to 10 Hz
f = 1 kHz
0.2
16
μV p-p
nV/√Hz
Rev. 0 | Page 5 of 20
400
300
75
ADR821/ADR827
ADR827 ELECTRICAL CHARACTERISTICS—REFERENCE
VIN = 2.7 V to 15 V, TA = 25°C, CIN = COUT = 0.1 μF, unless otherwise noted.
Table 5.
Parameter
OUTPUT VOLTAGE
A Grade
B Grade
INITIAL ACCURACY
A Grade
Symbol
VOUT
Conditions
Min
Typ
Max
Unit
1.245
1.2475
1.250
1.250
1.255
1.2525
V
V
5
0.40
2.50
0.20
mV
%
mV
%
30
15
1.45
50
400
ppm/°C
ppm/°C
V
ppm/V
ppm/mA
80
200
600
ppm/mA
ppm/mA
80
8
260
80
300
ppm/mA
μV p-p
μV p-p
μs
400
300
μA
μA
12
kΩ
%
ppm/°C
VOERR
B Grade
TEMPERATURE COEFFICIENT
A Grade
B Grade
DROPOUT (VOUT – VIN)
LINE REGULATION
LOAD REGULATION
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
TCVOUT
VDO
∆VOUT/∆VIN
∆VOUT/∆ILOAD
eN p-p
tR
ISY+
ISY−
R1, R2
−40°C < TA < +125°C
IOUT = 0 mA
VIN = 2.7 V to 15 V, −40°C < TA < +125°C
ILOAD = 0 mA to 5 mA, −40°C < TA < +125°C,
VIN = 3 V
ILOAD = 0 mA to 5 mA, VIN = 3 V
ILOAD = −3 mA to 0 mA, −40°C < TA < +125°C,
VIN = 3 V
ILOAD = −3 mA to +5 mA, VIN = 3 V
0.1 Hz to 10 Hz
10 Hz to 10 kHz
CIN = 0 μF, COUT = 0.1 μF
20
No load, −40°C < TA < +125°C
No load, −40°C < TA < +125°C
8
TC
Rev. 0 | Page 6 of 20
10
0.5
±100
ADR821/ADR827
ADR827 ELECTRICAL CHARACTERISTICS—AMPLIFIER (VS = ±2.7 V)
VCM = 0 V, TA = 25°C, unless otherwise noted.
Table 6.
Parameter
INPUT CHARACTERISTICS
Input Offset Voltage
Input Offset Voltage Drift
Input Bias Current
Input Offset Bias Current
Large Signal Voltage Gain
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
Symbol
Conditions
VOS
TCVOS
IB
IOS
AVO
−40°C < TA < +125°C
−40°C < TA < +125°C
−40°C < TA < +125°C
−40°C < TA < +125°C
VOUT = −1.5 V to +1.5 V
RLOAD = 10 kΩ, −40°C < TA < +125°C
RLOAD = 2 kΩ, −40°C < TA < +125°C
VCM = −1.5 V to +1.5 V, −40°C < TA < +125°C
CMRR
VOH
VOL
ILOAD = 1 mA
ILOAD = 1 mA, −40°C < TA < +125°C
ILOAD = 1 mA
ILOAD = 1 mA, −40°C < TA < +125°C
ISY+
ISY−
PSRR
No load, −40°C < TA < +125°C
No load, −40°C < TA < +125°C
VS = ±2.7 V to ±15 V
SR
GBP
φM
eN p-p
eN
Min
Typ
Max
Unit
100
2
15
5
500
5
50
25
μV
μV/°C
nA
nA
99
94
75
85
108
100
100
dB
dB
dB
dB
2.5
2.45
2.6
V
V
V
V
−2.6
−2.5
−2.45
100
μA
μA
dB
RLOAD = 10 kΩ, CLOAD = 10 pF, AV = +1
CLOAD = 14 pF
CLOAD = 14 pF
0.5
1.0
71.3
V/μs
MHz
Degrees
f = 0.1 Hz to 10 Hz
f = 1 kHz
0.2
16
μV p-p
nV/√Hz
Rev. 0 | Page 7 of 20
400
300
75
ADR821/ADR827
ADR827 ELECTRICAL CHARACTERISTICS—AMPLIFIER (VS = ±15 V)
VCM = 0 V, TA = 25°C, unless otherwise noted.
Table 7.
Parameter
INPUT CHARACTERISTICS
Input Offset Voltage
Input Offset Voltage Drift
Input Bias Current
Input Offset Bias Current
Large Signal Voltage Gain
Common-Mode Rejection Ratio
OUTPUT CHARACTERISTICS
Output Voltage High
Output Voltage Low
Output Current
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
Symbol
Conditions
VOS
TCVOS
IB
IOS
AVO
−40°C < TA < +125°C
−40°C < TA < +125°C
−40°C < TA < +125°C
−40°C < TA < +125°C
VOUT = −14 V to +14 V
RLOAD = 10 kΩ, −40°C < TA < +125°C
RLOAD = 2 kΩ, −40°C < TA < +125°C
VCM = −14 V to +14 V, −40°C < TA < 125°C
CMRR
VOH
ISC
ILOAD = 1 mA
ILOAD = 1 mA, −40°C < TA < +125°C
ILOAD = 1 mA
ILOAD = 1 mA, −40°C < TA < +125°C
Short-circuit current
ISY+
ISY−
PSRR
No load, −40°C < TA < +125°C
No load, −40°C < TA < +125°C
VS = ±2.7 V to ±15 V
SR
GBP
φM
eN p-p
eN
VOL
Min
Typ
Max
Unit
100
2
10
5
500
5
50
25
μV
μV/°C
nA
nA
109.5
100
75
85
118
111
100
dB
dB
dB
dB
14.8
14.75
14.9
V
V
V
V
mA
−14.9
−14.8
−14.75
±20
100
μA
μA
dB
RLOAD = 10 kΩ, CLOAD = 10 pF, AV = +1
CLOAD = 14 pF
CLOAD = 14 pF
0.5
1.0
75.4
V/μs
MHz
Degrees
f = 0.1 Hz to 10 Hz
f = 1 kHz
0.2
16
μV p-p
nV/√Hz
Rev. 0 | Page 8 of 20
400
300
75
ADR821/ADR827
ABSOLUTE MAXIMUM RATINGS
TA= 25°C, unless otherwise noted.
THERMAL RESISTANCE
Table 8.
θJA is specified for the worst-case conditions, that is, θJA is
specified for device soldered in circuit board for surface-mount
packages.
Parameter
Supply Voltage
Output Short-Circuit Duration to GND
Storage Temperature Range
Operating Temperature Range
Junction Temperature Range
Lead Temperature (Soldering, 60 sec)
Rating
±18 V
Indefinite
–65°C to +125°C
–40°C to +125°C
–65°C to +125°C
300°C
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
Table 9. Thermal Resistance
Package Type
10-Lead MSOP (RM-10)
ESD CAUTION
Rev. 0 | Page 9 of 20
θJA
172
θJC
50
Unit
°C/W
ADR821/ADR827
V+ 1
10
AMP_OUT
R1 2
9
R2
8
–IN
7
+IN
6
REF_OUT
GND 3
NC 4
V– 5
ADR821/
ADR827
TOP VIEW
(Not to Scale)
NC = NO CONNECT
06665-002
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
Figure 2. Pin Configuration
Table 10. Pin Function Descriptions
Pin No.
1
2
3
4
5
6
7
8
9
10
Mnemonic
V+
R1
GND
NC
V−
REF_OUT
+IN
−IN
R2
AMP_OUT
Description
Input Voltage of the Reference/Positive Supply of the Amplifier
Resistance Tied to Positive Input of the Amplifier
Ground
Do Not Connect Any External Components to This Pin
Negative Supply of the Amplifier
Output Voltage of the Reference
Positive Input of the Amplifier
Negative Input of the Amplifier
Resistance Tied to Positive Input of the Amplifier
Output Pin of the Amplifier
Rev. 0 | Page 10 of 20
ADR821/ADR827
TYPICAL PERFORMANCE CHARACTERISTICS
REFERENCE
2.512
2.508
1.260
CIN = 0.1µF
COUT = 0.1µF
VIN = 15V
1.256
1.254
VOUT (V)
2.504
VOUT (V)
CIN = 0.1µF
COUT = 0.1µF
VIN = 15V
1.258
2.500
2.496
1.252
1.250
1.248
1.246
1.244
2.492
–10
5
20
35
50
65
80
95
110
125
TEMPERATURE (°C)
1.240
–40
06665-005
–25
–25
50
65
80
95
110
125
CIN = 0.1µF
COUT = 0.1µF
VIN = 15V
12
2
1
0
–1
10
8
6
4
–10
5
20
35
50
65
80
95
110
125
TEMPERATURE (°C)
0
–40
06665-006
5
20
35
0.40
0.35
ISY+ (mA)
0.25
+25°C
0.20
–40°C
95
110
125
+25°C
0.20
–40°C
0.15
0.15
0.10
0.10
0.05
5.0
7.5
10.0
12.5
SUPPLY VOLTAGE (±V)
15.0
06665-007
0.05
2.5
80
+125°C
+125°C
0.25
65
CIN = 0.1µF
COUT = 0.1µF
0.30
0.30
50
Figure 7. ADR827 Line Regulation vs. Temperature
CIN = 0.1µF
COUT = 0.1µF
0.35
–10
TEMPERATURE (°C)
Figure 4. ADR821 Line Regulation vs. Temperature
0.40
–25
Figure 5. ADR821 Supply Current (+) vs. Supply Voltage
0
2.5
5.0
7.5
10.0
12.5
SUPPLY VOLTAGE (±V)
Figure 8. ADR827 Supply Current (+) vs. Supply Voltage
Rev. 0 | Page 11 of 20
15.0
06665-010
–25
06665-009
2
–2
–40
ISY+ (mA)
35
14
LINE REGULATION (ppm/V)
LINE REGULATION (ppm/V)
20
Figure 6. ADR827 VOUT vs. Temperature
CIN = 0.1µF
COUT = 0.1µF
VIN = 15V
3
5
TEMPERATURE (°C)
Figure 3. ADR821 VOUT vs. Temperature
4
–10
06665-008
1.242
2.488
–40
ADR821/ADR827
0.25
CIN = 0.1µF
COUT = 0.1µF
0.20
+125°C
0.20
0.15
+25°C
0.15
ISY– (mA)
–40°C
0.10
0.05
+125°C
+25°C
–40°C
0.10
0.05
5.0
7.5
10.0
15.0
12.5
SUPPLY VOLTAGE (±V)
0
2.5
06665-011
0
2.5
1.2
5.0
7.5
10.0
15.0
12.5
SUPPLY VOLTAGE (±V)
Figure 9. ADR821 Supply Current (−) vs. Supply Voltage
Figure 12. ADR827 Supply Current (−) vs. Supply Voltage
2.0
CIN = 0.1µF
COUT = 0.1µF
CIN = 0.1µF
1.8 COUT = 0.1µF
1.0
1.6
1.4
0.8
+125°C
DROPOUT (V)
DROPOUT (V)
CIN = 0.1µF
COUT = 0.1µF
06665-014
ISY– (mA)
0.25
0.6
+25°C
0.4
–40°C
–40°C
1.2
+25°C
1.0
0.8
+125°C
0.6
0.4
0.2
0
1
2
3
4
5
6
7
LOAD CURRENT (mA)
0
–3
–2
80
LOAD REGULATION (ppm/mA)
ISINK = 3mA
CIN = COUT = 0.1µF
40
VS = 5V
35
30
25
1
2
3
4
5
6
7
110
125
Figure 13. ADR827 Dropout vs. Load Current
VS = 15V
20
15
ISINK = 3mA
CIN = COUT = 0.1µF
70
60
VS = 15V
50
VS = 3V
40
10
5
–40
–25
–10
5
20
35
50
65
80
95
110
TEMPERATURE (°C)
125
06665-013
LOAD REGULATION (ppm/mA)
45
0
LOAD CURRENT (mA)
Figure 10. ADR821 Dropout vs. Load Current
50
–1
06665-015
–1
06665-012
–2
06665-016
0.2
0
–3
Figure 11. ADR821 Load Regulation vs. Temperature
30
–40
–25
–10
5
20
35
50
65
80
95
TEMPERATURE (°C)
Figure 14. ADR827 Load Regulation vs. Temperature
Rev. 0 | Page 12 of 20
ADR821/ADR827
–20
VS = 5V
–40
–60
–80
VS = 15V
–100
VS = 15V
–60
–80
–100
5
20
35
50
65
80
95
110
125
TEMPERATURE (°C)
–140
–40
–25
–10
5
20
35
50
65
80
95
110
125
TEMPERATURE (°C)
Figure 15. ADR821 Load Regulation vs. Temperature
Figure 18. ADR827 Load Regulation vs. Temperature
CIN = COUT = 0.1µF
15.6µV p-p
2.78µV rms
5µV/DIV
CIN = COUT = 0.1µF
8.3µV p-p
1.33µV rms
TIME (1s/DIV)
1
06665-018
1
TIME (1s/DIV)
Figure 16. ADR821 0.1 Hz to 10 Hz Noise
Figure 19. ADR827 0.1 Hz to 10 Hz Noise
CIN = COUT = 0.1µF
426µV p-p
55.6µV rms
100µV/DIV
CIN = COUT = 0.1µF
258µV p-p
34.6µV rms
TIME (1s/DIV)
06665-019
1
1
TIME (1s/DIV)
Figure 17. ADR821 10 Hz to 10 kHz Noise
Figure 20. ADR827 10 Hz to 10 kHz Noise
Rev. 0 | Page 13 of 20
06665-020
–10
06665-021
–25
06665-017
–140
–40
10µV/DIV
VS = 3V
–40
–120
–120
100µV/DIV
ISOURCE = 5mA
CIN = COUT = 0.1µF
06665-022
LOAD REGULATION (ppm/mA)
–20
0
ISOURCE = 5mA
CIN = COUT = 0.1µF
LOAD REGULATION (ppm/mA)
0
ADR821/ADR827
CHANNEL 2:
VOUT = 500mV/DIV
CHANNEL 2:
VOUT = 1V/DIV
2
1
Figure 21. ADR821 Turn-On Response
CHANNEL 1:
VIN = 2V/DIV
CIN = 0µF
CL = 0.1µF
TIME = 20µs/DIV
Figure 22. ADR827 Turn-On Response
Rev. 0 | Page 14 of 20
06665-024
CHANNEL 1:
VIN = 2V/DIV
CIN = 0µF
CL = 0.1µF
TIME = 20µs/DIV
06665-023
1
2
ADR821/ADR827
AMPLIFIER (AD821/AD827)
120
400
VSY = ±15V
TA = 25°C
300
200
80
VOS (µV)
NUMBER OF SAMPLES
100
500
VSY = ±15V
TA = 25°C
60
40
100
0
–100
–200
–300
20
0
100
200
300
400
500
VOS (µV)
–500
–15
06665-025
0
–500 –400 –300 –200 –100
–12
–9
–6
–3
0
3
6
9
12
15
VCM (V)
Figure 23. Input Offset Voltage Distribution
06665-029
–400
Figure 26. Input Offset Voltage vs. Common-Mode Voltage
160
200
VSY = ±15V
VSY = ±15V
120
100
100
VOS (µV)
NUMBER OF SAMPLES
140
80
0
60
40
–100
–3
–2
–1
0
1
2
3
4
5
TCVOS (µV/°C)
–200
–55 –40 –25 –10
100000
OUTPUT SWING SATURATION VOLTAGE (mV)
VSY = ±15V
TA = 25°C
40
30
10
0
–10
–20
–30
–5
–3
–1
1
3
5
7
9
11
VCM (V)
13
06665-030
IB (nA)
20
–7
35
50
65
80
95 110 125 140 155
Figure 27. Input Offset Voltage vs. Temperature
60
–40
–13 –11 –9
20
TEMPERATURE (°C)
Figure 24. Offset Voltage Drift Distribution
50
5
VSY = ±15V
TA = 25°C
10000
1000
VOL SINKING
100
VSY – VOH SOURCING
10
1
0.1
0.01
0.1
1
10
100
LOAD CURRENT (mA)
Figure 28. Output Swing Saturation Voltage vs. Load Current
Figure 25. Input Bias Current vs. Common-Mode Voltage
Rev. 0 | Page 15 of 20
06665-028
–4
06665-026
0
–5
06665-027
20
ADR821/ADR827
70
VSY = ±15V
TA = 25°C
50
120
75
45
10
30
GAIN
15
–10
0
100
CMRR (dB)
60
PHASE (Degrees)
PHASE
80
60
40
–15
–30
VSY = ±15V
TA = 25°C
105
90
30
–30
20
1k
10k
100k
1M
–60
100M
10M
0
100
06665-031
–50
100
FREQUENCY (Hz)
1k
40
140
10M
100M
VSY = ±15V
TA = 25°C
120
30
20
1M
Figure 32. CMRR vs. Frequency
VSY = ±15V
TA = 25°C
G = 100
100k
FREQUENCY (Hz)
Figure 29. Open-Loop Gain and Phase vs. Frequency
50
10k
06665-034
–45
G = 10
100
0
G=1
PSRR (dB)
ACL (dB)
10
–10
80
60
PSRR+
–20
40
–30
–40
PSRR–
20
1k
10k
100k
1M
10M
100M
FREQUENCY (Hz)
0
100
06665-032
–60
100
10k
100k
1M
10M
100M
FREQUENCY (Hz)
Figure 30. Closed-Loop Gain vs. Frequency
1200
1k
Figure 33. PSRR vs. Frequency
VSY = ±15V
TA = 25°C
RLOAD = 10kΩ
CLOAD = 10pF
VSY = ±15V
1000
VOUT = 2V/DIV
800
600
400
2
200
100
1k
10k
100k
FREQUENCY (Hz)
G=1
1M
10M
Figure 31. ZOUT vs. Frequency
TIME = 10µs/DIV
Figure 34. Large Signal Transient Response
Rev. 0 | Page 16 of 20
06665-036
0
10
G = 10
06665-033
G = 100
06665-035
–50
ZOUT (Ω)
GAIN (dB)
140
120
ADR821/ADR827
1000
VSY = ±15V
TA = 25°C
EN (nV/ Hz)
100
2
TIME = 1µs/DIV
1
1
10
100
1000
FREQUENCY (Hz)
Figure 37. Voltage Noise Density
Figure 35. Small Signal Transient Response, CL = 10 pF
2
TIME = 1µs/DIV
06665-038
VOUT = 50mV/DIV
RL = 10kΩ
CL = 100pF
VSY = ±15V
Figure 36. Small Signal Transient Response, CL = 100 pF
Rev. 0 | Page 17 of 20
10000
06665-039
10
06665-037
VOUT = 50mV/DIV
RL = 10kΩ
CL = 10pF
VSY = ±15V
ADR821/ADR827
APPLICATIONS INFORMATION
fed to the amplifier noninverting input. The op amp is configured as a noninverting amplifier with a gain of +2, which
produces 5 V at the output of the op amp. Using the guaranteed
maximum offset voltage over the temperature, and the typical
TC ratio of the resistors over the full temperature range, the
output is within 15 mV of the calculated value.
+2.5 V AND −2.5 V OUTPUTS (ADR821)
REF
REF_OUT +2.5V
0.1µF
V+
AMP_OUT
V–
R1 10kΩ
10kΩ
–2.5V
MULTIPLE 2.5 V OUTPUTS (ADR821)
06665-003
+IN
R2
Figure 38. +2.5 V and −2.5 V Outputs
REF
REF_OUT
2.5V
0.1µF
2.5 V AND 5.0 V OUTPUTS (ADR821)
REF
REF_OUT
2.5V
0.1µF
V+
AMP_OUT
V–
R1 10kΩ
10kΩ
5.0V
R2
–IN
06665-004
+IN
Figure 39. 2.5 V and 5.0 V Outputs
In many single-supply applications, it is desirable to have
multiple reference voltages. Using the configuration shown in
Figure 39, it is possible to generate 5.0 V with the help of a
2.5 V reference, an internal op amp, and resistors. V+ should
be kept at greater than 5.8 V and V− can be connected either
to ground or to negative supply. The output of the reference is
V+
+IN
R1
AMP_OUT
V–
10kΩ
10kΩ
–IN
2.5V
R2
06665-040
In many dual-supply applications, it is desirable to have ±2.5 V
references. Using the configuration shown in Figure 38, it is
possible to generate −2.5 V with the help of a +2.5 V reference,
an internal op amp, and 10 kΩ resistors. The supply voltages V+
and V− should be greater than +2.8 V and −2.8 V, respectively.
The op amp is configured as an inverting amplifier with a gain
of −1, which produces −2.5 V at the output of the op amp. The
output of the reference is fed to the amplifier inverting input.
Because the op amp has very low input offset voltage (500 μV
over the full temperature range) and the TC ratio of the
resistors is typically ±25 ppm/°C, the −2.5 V output is less than
7 mV away from the theoretical value.
Figure 40. Multiple 2.5 V Outputs
On some boards, sensitive analog circuits, such as a VCO, exist
with noisy digital circuits. If the supply current requirements
are low (less than 3 mA), series references and op amps can be
used. Using the configuration shown in Figure 40, two different
2.5 V supplies can be created using a single ADR821. The supply
voltage V+ should be greater than 2.8 V and V− can be connected to ground or a negative voltage. The op amp is configured
as a voltage follower with a gain of +1, which produces 2.5 V at
the output of the op amp. The output of the reference is fed
to the amplifier noninverting input. Because the op amp has
very low input offset voltage (500 μV maximum over the full
temperature range), the output voltage from the op amp section
tracks the reference voltage within 1 mV. For a dynamic load,
such as the reference input pin on some analog-to-digital
converters, the load should be connected to an op amp output
and the noise sensitive circuitry, such as a VCO, should be
connected to the reference output. If the dynamic load is connected to the reference voltage, any perturbations appear as a
signal to the input of the voltage follower and appear on the
other output.
Rev. 0 | Page 18 of 20
ADR821/ADR827
OUTLINE DIMENSIONS
3.10
3.00
2.90
6
10
3.10
3.00
2.90
1
5.15
4.90
4.65
5
PIN 1
0.50 BSC
0.95
0.85
0.75
1.10 MAX
0.15
0.05
0.33
0.17
SEATING
PLANE
0.23
0.08
0.80
0.60
0.40
8°
0°
COPLANARITY
0.10
COMPLIANT TO JEDEC STANDARDS MO-187-BA
Figure 41. 10-Lead Mini Small Outline Package [MSOP]
(RM-10)
Dimensions shown in millimeters
ORDERING GUIDE
Models
Temperature
Range
Output
Voltage
(VOUT)
ADR821ARMZ-REEL71
ADR821ARMZ-R21
ADR821BRMZ-REEL71
ADR821BRMZ-R21
ADR827ARMZ-REEL71
ADR827ARMZ-R21
ADR827BRMZ-REEL71
ADR827BRMZ-R21
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
2.500
2.500
2.500
2.500
1.250
1.250
1.250
1.250
1
Initial
Accuracy
(mV)
(%)
10.00
±0.40
10.00
±0.40
5.00
±0.20
5.00
±0.20
5.00
±0.40
5.00
±0.40
2.50
±0.20
2.50
±0.20
Temperature
Coefficient
(ppm/°C)
Package
Description
Package
Option
Ordering
Quantity
Branding
30
30
15
15
30
30
15
15
10-Lead MSOP
10-Lead MSOP
10-Lead MSOP
10-Lead MSOP
10-Lead MSOP
10-Lead MSOP
10-Lead MSOP
10-Lead MSOP
RM-10
RM-10
RM-10
RM-10
RM-10
RM-10
RM-10
RM-10
1,000
250
1,000
250
1,000
250
1,000
250
R2G
R2G
R2H
R2H
R0Z
R0Z
R2B
R2B
Z = RoHS Compliant Part.
Rev. 0 | Page 19 of 20
ADR821/ADR827
NOTES
©2007 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D06665-0-10/07(0)
Rev. 0 | Page 20 of 20
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