ADR827BRMZ-R21 [ADI]
Low Power, Precision Reference and Op Amp; 低功耗，精密基准和运算放大器
| 型号： | ADR827BRMZ-R21 |
| 厂家： | 
ADI |
| 描述： | Low Power, Precision Reference and Op Amp |
| 文件： | 总20页 (文件大小：616K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Low Power, Precision Reference
and Op Amp
ADR821/ADR827
FUNCTIONAL BLOCK DIAGRAM
FEATURES
10-lead MSOP
ADR821/ADR827
1
2
3
4
5
10
9
V+
AMP_OUT
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
0.2ꢀ initial accuracy
15 ppm/°C temperature drift maximum
+5 mA/−3 mA output drive
Amplifier
R
R
2
1
R
1
R
2
–IN
GND
8
7
+IN
NC
V–
REF
6
REF_OUT
NC = NO CONNECT
Figure 1.
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
Table 1. Selection Table
Reference Reference
Reference
Temperature
Coefficient
Part No.
VOUT
Accuracy
ADR827ARMZ 1.25 V
ADR827BRMZ 1.25 V
ADR821ARMZ 2.5± V
ADR821BRMZ 2.5± V
±±.ꢀ4
±±.24
±±.ꢀ4
±±.24
3± ppm/°C
15 ppm/°C
3± ppm/°C
15 ppm/°C
No phase reversal
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 registeredtrademarks arethe property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
www.analog.com
©2007 Analog Devices, Inc. All rights reserved.
ADR821/ADR827
TABLE OF CONTENTS
Features .............................................................................................. 1
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
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
ADR821 Electrical Characteristics—Reference ....................... 3
ADR821 Electrical Characteristics—Amplifier
(VS = 2.8 V)................................................................................. 4
ADR821 Electrical Characteristics—Amplifier
(VS = 15 V).................................................................................. 5
ADR827 Electrical Characteristics—Reference ....................... 6
ADR827 Electrical Characteristics—Amplifier
(VS = 2.7 V)................................................................................. 7
ADR827 Electrical Characteristics—Amplifier
(VS = 15 V).................................................................................. 8
REVISION HISTORY
10/07—Revision 0: Initial Version
Rev. ± | Page 2 of 2±
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
Symbol
Conditions
Min
Typ
Max
Unit
VOUT
2.ꢀ9± 2.5±± 2.51±
2.ꢀ95 2.5±± 2.5±5
V
V
B Grade
INITIAL ACCURACY
A Grade
VOERR
1±
mV
4
mV
4
±.ꢀ±
5.±±
±.2±
B Grade
TEMPERATURE COEFFICIENT
A Grade
B Grade
TCVOUT
−ꢀ±°C < TA < +125°C
3±
15
±.3
ppm/°C
ppm/°C
V
DROPOUT (VOUT – VIN)
LINE REGULATION
LOAD REGULATION
VDO
IOUT = ± mA
∆VOUT/∆VIN
VIN = 2.8 V to 15 V, −ꢀ±°C < TA < +125°C
2±
8±
5±
ppm/V
ppm/mA
∆VOUT/∆ILOAD ILOAD = ± mA to 5 mA, −ꢀ±°C < TA < +125°C,
IN = 5 V
ꢀ±±
V
ILOAD = ± mA to 5 mA, VIN = 5 V
ILOAD = −3 mA to ± mA, −ꢀ±°C < TA < +125°C,
2±±
6±±
ppm/mA
ppm/mA
V
IN = 5 V
ILOAD = −3 mA to +5 mA, VIN = 5 V
±.1 Hz to 1± Hz
8±
3±±
ppm/mA
μV p-p
μV p-p
μs
VOLTAGE NOISE
eN p-p
tR
16
BROADBAND NOISE
TURN-ON SETTLING TIME
POWER SUPPLY
1± Hz to 1± kHz
ꢀ3±
8±
CIN = ± μF
Positive Supply Current
Negative Supply Current
ON-BOARD RESISTORS
Resistor Tolerance
ISY+
ISY−
No load, −ꢀ±°C < TA < +125°C
No load, −ꢀ±°C < TA < +125°C
ꢀ±±
3±±
μA
μA
R1, R2
8
1±
12
kΩ
Resistor Matching
±.5
4
Resistor Temperature Coefficient TC
±1±±
ppm/°C
Rev. ± | Page 3 of 2±
ADR821/ADR827
ADR821 ELECTRICAL CHARACTERISTICS—AMPLIFIER (VS = 2.8 Vꢁ
VCM = 0 V, TA = 25°C, unless otherwise noted.
Table 3.
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
INPUT CHARACTERISTICS
Input Offset Voltage
Input Offset Voltage Drift
Input Bias Current
Input Offset Bias Current
Large Signal Voltage Gain
VOS
TCVOS
IB
IOS
AVO
−ꢀ±°C < TA < +125°C
−ꢀ±°C < TA < +125°C
−ꢀ±°C < TA < +125°C
−ꢀ±°C < TA < +125°C
1±±
2
15
5
5±±
5
5±
25
μV
μV/°C
nA
nA
VOUT = −1.5 V to +1.5 V
RLOAD = 1± kΩ, −ꢀ±°C < TA < +125°C
RLOAD = 2 kΩ, −ꢀ±°C < TA < +125°C
VCM = −1.5 V to +1.5 V, −ꢀ±°C < TA < +125°C
99
9ꢀ
75
85
1±8
1±±
1±±
dB
dB
dB
dB
Common-Mode Rejection Ratio
CMRR
OUTPUT CHARACTERISTICS
Output Voltage High
VOH
VOL
ILOAD = 1 mA
ILOAD = 1 mA, −ꢀ±°C < TA < +125°C
ILOAD = 1 mA
2.6
2.55
2.7
V
V
V
V
Output Voltage Low
−2.7
−2.6
−2.55
ILOAD = 1 mA, −ꢀ±°C < TA < +125°C
POWER SUPPLY
Positive Supply Current
Negative Supply Current
Power Supply Rejection Ratio
DYNAMIC PERFORMANCE
Slew Rate
ISY+
ISY−
PSRR
No load, −ꢀ±°C < TA < +125°C
No load, −ꢀ±°C < TA < +125°C
VS = ±2.8 V to ±15 V
ꢀ±±
3±±
μA
μA
dB
75
1±±
SR
GBP
φM
RLOAD = 1± kΩ, CLOAD = 1± pF, AV = +1
CLOAD = 1ꢀ pF
CLOAD = 1ꢀ pF
±.5
1.±
72.5
V/μs
MHz
Degrees
Gain Bandwidth Product
Phase Margin
NOISE PERFORMANCE
Voltage Noise
Voltage Noise Density
eN p-p
eN
f = ±.1 Hz to 1± Hz
f = 1 kHz
±.2
16
μV p-p
nV/√Hz
Rev. ± | Page ꢀ of 2±
ADR821/ADR827
ADR821 ELECTRICAL CHARACTERISTICS—AMPLIFIER (VS = 15 Vꢁ
VCM= 0 V, TA = 25°C, unless otherwise noted.
Table 4.A
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
INPUT CHARACTERISTICS
Input Offset Voltage
Input Offset Voltage Drift
Input Bias Current
Input Offset Bias Current
Large Signal Voltage Gain
VOS
TCVOS
IB
IOS
AVO
−ꢀ±°C < TA < +125°C
−ꢀ±°C < TA < +125°C
−ꢀ±°C < TA < +125°C
−ꢀ±°C < TA < +125°C
1±±
2
1±
5
5±±
5
5±
25
μV
μV/oC
nA
nA
VOUT = −1ꢀ V to +1ꢀ V
RLOAD = 1± kΩ, −ꢀ±°C < TA < +125°C
RLOAD = 2 kΩ, −ꢀ±°C < TA < +125°C
VCM = −1ꢀ V to +1ꢀ V, −ꢀ±°C < TA < +125°C
1±9.5
1±±
75
118
111
1±±
dB
dB
dB
dB
Common-Mode Rejection Ratio
CMRR
85
OUTPUT CHARACTERISTICS
Output Voltage high
VOH
VOL
ISC
ILOAD = 1 mA
ILOAD = 1 mA, −ꢀ±°C < TA < +125°C
ILOAD = 1 mA
ILOAD = 1 mA, −ꢀ±°C < TA < +125°C
Short-circuit current
1ꢀ.8
1ꢀ.75
1ꢀ.9
−1ꢀ.9
±2±
V
V
V
V
Output Voltage Low
−1ꢀ.8
−1ꢀ.75
Output Current
mA
POWER SUPPLY
Positive Supply Current
Negative Supply Current
Power Supply Rejection Ratio
DYNAMIC PERFORMANCE
Slew Rate
ISY+
ISY−
PSRR
No load, −ꢀ±°C < TA < +125°C
No load, −ꢀ±°C < TA < +125°C
VS = ±2.8 V to ±15 V
ꢀ±±
3±±
μA
μA
dB
75
1±±
SR
GBP
φM
RLOAD = 1± kΩ, CLOAD = 1± pF, AV = +1
CLOAD = 1ꢀ pF
CLOAD = 1ꢀ pF
±.5
1.±
75.ꢀ
V/μs
MHz
Degrees
Gain Bandwidth Product
Phase Margin
NOISE PERFORMANCE
Voltage Noise
Voltage Noise Density
eN p-p
eN
f = ±.1 Hz to 1± Hz
f = 1 kHz
±.2
16
μV p-p
nV/√Hz
Rev. ± | Page 5 of 2±
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
Symbol
Conditions
Min
Typ
Max
Unit
VOUT
1.2ꢀ5
1.25± 1.255
V
V
B Grade
1.2ꢀ75 1.25± 1.2525
INITIAL ACCURACY
A Grade
VOERR
5
mV
4
mV
4
±.ꢀ±
2.5±
±.2±
B Grade
TEMPERATURE COEFFICIENT
A Grade
B Grade
TCVOUT
−ꢀ±°C < TA < +125°C
3±
15
ppm/°C
ppm/°C
V
DROPOUT (VOUT – VIN)
LINE REGULATION
LOAD REGULATION
VDO
IOUT = ± mA
1.ꢀ5
∆VOUT/∆VIN
VIN = 2.7 V to 15 V, −ꢀ±°C < TA < +125°C
2±
8±
5±
ppm/V
ppm/mA
∆VOUT/∆ILOAD ILOAD = ± mA to 5 mA, −ꢀ±°C < TA < +125°C,
IN = 3 V
ꢀ±±
V
ILOAD = ± mA to 5 mA, VIN = 3 V
ILOAD = −3 mA to ± mA, −ꢀ±°C < TA < +125°C,
2±±
6±±
ppm/mA
ppm/mA
VIN = 3 V
ILOAD = −3 mA to +5 mA, VIN = 3 V
±.1 Hz to 1± Hz
8±
8
3±±
ppm/mA
μV p-p
μV p-p
μs
VOLTAGE NOISE
eN p-p
tR
BROADBAND NOISE
TURN-ON SETTLING TIME
POWER SUPPLY
1± Hz to 1± kHz
26±
8±
CIN = ± μF, COUT = ±.1 μF
Positive Supply Current
Negative Supply Current
ON-BOARD RESISTORS
Resistor Tolerance
ISY+
ISY−
No load, −ꢀ±°C < TA < +125°C
No load, −ꢀ±°C < TA < +125°C
ꢀ±±
3±±
μA
μA
R1, R2
8
1±
12
kΩ
Resistor Matching
±.5
4
Resistor Temperature Coefficient TC
±1±±
ppm/°C
Rev. ± | Page 6 of 2±
ADR821/ADR827
ADR827 ELECTRICAL CHARACTERISTICS—AMPLIFIER (VS = 2.7 Vꢁ
VCM = 0 V, TA = 25°C, unless otherwise noted.
Table 6.
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
INPUT CHARACTERISTICS
Input Offset Voltage
Input Offset Voltage Drift
Input Bias Current
Input Offset Bias Current
Large Signal Voltage Gain
VOS
TCVOS
IB
IOS
AVO
−ꢀ±°C < TA < +125°C
−ꢀ±°C < TA < +125°C
−ꢀ±°C < TA < +125°C
−ꢀ±°C < TA < +125°C
1±±
2
15
5
5±±
5
5±
25
μV
μV/°C
nA
nA
VOUT = −1.5 V to +1.5 V
RLOAD = 1± kΩ, −ꢀ±°C < TA < +125°C
RLOAD = 2 kΩ, −ꢀ±°C < TA < +125°C
VCM = −1.5 V to +1.5 V, −ꢀ±°C < TA < +125°C
99
9ꢀ
75
85
1±8
1±±
1±±
dB
dB
dB
dB
Common-Mode Rejection Ratio
CMRR
OUTPUT CHARACTERISTICS
Output Voltage High
VOH
VOL
ILOAD = 1 mA
ILOAD = 1 mA, −ꢀ±°C < TA < +125°C
ILOAD = 1 mA
2.5
2.ꢀ5
2.6
V
V
V
V
Output Voltage Low
−2.6
−2.5
−2.ꢀ5
ILOAD = 1 mA, −ꢀ±°C < TA < +125°C
POWER SUPPLY
Positive Supply Current
Negative Supply Current
Power Supply Rejection Ratio
DYNAMIC PERFORMANCE
Slew Rate
ISY+
ISY−
PSRR
No load, −ꢀ±°C < TA < +125°C
No load, −ꢀ±°C < TA < +125°C
VS = ±2.7 V to ±15 V
ꢀ±±
3±±
μA
μA
dB
75
1±±
SR
GBP
φM
RLOAD = 1± kΩ, CLOAD = 1± pF, AV = +1
CLOAD = 1ꢀ pF
CLOAD = 1ꢀ pF
±.5
1.±
71.3
V/μs
MHz
Degrees
Gain Bandwidth Product
Phase Margin
NOISE PERFORMANCE
Voltage Noise
Voltage Noise Density
eN p-p
eN
f = ±.1 Hz to 1± Hz
f = 1 kHz
±.2
16
μV p-p
nV/√Hz
Rev. ± | Page 7 of 2±
ADR821/ADR827
ADR827 ELECTRICAL CHARACTERISTICS—AMPLIFIER (VS = 15 Vꢁ
VCM = 0 V, TA = 25°C, unless otherwise noted.
Table 7.
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
INPUT CHARACTERISTICS
Input Offset Voltage
Input Offset Voltage Drift
Input Bias Current
Input Offset Bias Current
Large Signal Voltage Gain
VOS
TCVOS
IB
IOS
AVO
−ꢀ±°C < TA < +125°C
−ꢀ±°C < TA < +125°C
−ꢀ±°C < TA < +125°C
−ꢀ±°C < TA < +125°C
1±±
2
1±
5
5±±
5
5±
25
μV
μV/°C
nA
nA
VOUT = −1ꢀ V to +1ꢀ V
RLOAD = 1± kΩ, −ꢀ±°C < TA < +125°C
RLOAD = 2 kΩ, −ꢀ±°C < TA < +125°C
VCM = −1ꢀ V to +1ꢀ V, −ꢀ±°C < TA < 125°C
1±9.5 118
dB
dB
dB
dB
1±±
75
111
1±±
Common-Mode Rejection Ratio
CMRR
85
OUTPUT CHARACTERISTICS
Output Voltage High
VOH
VOL
ISC
ILOAD = 1 mA
ILOAD = 1 mA, −ꢀ±°C < TA < +125°C
ILOAD = 1 mA
ILOAD = 1 mA, −ꢀ±°C < TA < +125°C
Short-circuit current
1ꢀ.8
1ꢀ.75
1ꢀ.9
V
V
V
V
Output Voltage Low
−1ꢀ.9 −1ꢀ.8
−1ꢀ.75
±2±
Output Current
mA
POWER SUPPLY
Positive Supply Current
Negative Supply Current
Power Supply Rejection Ratio
DYNAMIC PERFORMANCE
Slew Rate
ISY+
ISY−
PSRR
No load, −ꢀ±°C < TA < +125°C
No load, −ꢀ±°C < TA < +125°C
VS = ±2.7 V to ±15 V
ꢀ±±
3±±
μA
μA
dB
75
1±±
SR
GBP
φM
RLOAD = 1± kΩ, CLOAD = 1± pF, AV = +1
CLOAD = 1ꢀ pF
CLOAD = 1ꢀ pF
±.5
1.±
75.ꢀ
V/μs
MHz
Degrees
Gain Bandwidth Product
Phase Margin
NOISE PERFORMANCE
Voltage Noise
Voltage Noise Density
eN p-p
eN
f = ±.1 Hz to 1± Hz
f = 1 kHz
±.2
16
μV p-p
nV/√Hz
Rev. ± | Page 8 of 2±
ADR821/ADR827
ABSOLUTE MAXIMUM RATINGS
TA= 25°C, unless otherwise noted.
THERMAL RESISTANCE
θJA is specified for the worst-case conditions, that is, θJA is
specified for device soldered in circuit board for surface-mount
packages.
Table 8.
Parameter
Rating
Supply Voltage
±18 V
Output Short-Circuit Duration to GND
Storage Temperature Range
Operating Temperature Range
Junction Temperature Range
Lead Temperature (Soldering, 6± sec)
Indefinite
Table 9. Thermal Resistance
Package Type
–65°C to +125°C
–ꢀ±°C to +125°C
–65°C to +125°C
3±±°C
θJA
θJC
Unit
1±-Lead MSOP (RM-1±)
172
5±
°C/W
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.
ESD CAUTION
Rev. ± | Page 9 of 2±
ADR821/ADR827
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
V+
1
2
3
4
5
10 AMP_OUT
R
9
8
7
6
R
2
1
ADR821/
ADR827
GND
NC
–IN
TOP VIEW
+IN
(Not to Scale)
V–
REF_OUT
NC = NO CONNECT
Figure 2. Pin Configuration
Table 10. Pin Function Descriptions
Pin No.
Mnemonic
Description
1
2
3
ꢀ
V+
R1
GND
NC
V−
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
5
6
7
REF_OUT
+IN
Output Voltage of the Reference
Positive Input of the Amplifier
8
−IN
Negative Input of the Amplifier
9
1±
R2
Resistance Tied to Positive Input of the Amplifier
Output Pin of the Amplifier
AMP_OUT
Rev. ± | Page 1± of 2±
ADR821/ADR827
TYPICAL PERFORMANCE CHARACTERISTICS
REFERENCE
2.512
1.260
1.258
1.256
1.254
1.252
1.250
1.248
1.246
1.244
1.242
1.240
C
C
= 0.1µF
C
C
= 0.1µF
= 0.1µF
IN
OUT
= 15V
IN
OUT
= 15V
= 0.1µF
V
V
IN
IN
2.508
2.504
2.500
2.496
2.492
2.488
–40 –25 –10
5
20
35
50
65
80
95 110 125
–40 –25 –10
5
20
35
50
65
80
95 110 125
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 3. ADR821 VOUT vs. Temperature
Figure 6. ADR827 VOUT vs. Temperature
4
3
14
12
10
8
C
C
V
= 0.1µF
= 0.1µF
OUT
= 15V
C
C
V
= 0.1µF
= 0.1µF
OUT
= 15V
IN
IN
IN
IN
2
1
6
0
4
–1
–2
2
0
–40 –25 –10
5
20
35
50
65
80
95 110 125
–40 –25 –10
5
20
35
50
65
80
95 110 125
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 4. ADR821 Line Regulation vs. Temperature
Figure 7. ADR827 Line Regulation vs. Temperature
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
C
C
= 0.1µF
= 0.1µF
C
C
= 0.1µF
IN
OUT
IN
= 0.1µF
OUT
+125°C
+125°C
+25°C
–40°C
+25°C
–40°C
2.5
5.0
7.5
10.0
12.5
15.0
2.5
5.0
7.5
10.0
12.5
15.0
SUPPLY VOLTAGE (±V)
SUPPLY VOLTAGE (±V)
Figure 5. ADR821 Supply Current (+) vs. Supply Voltage
Figure 8. ADR827 Supply Current (+) vs. Supply Voltage
Rev. ± | Page 11 of 2±
ADR821/ADR827
0.25
0.25
0.20
0.15
0.10
0.05
0
C
C
= 0.1µF
= 0.1µF
C
C
= 0.1µF
= 0.1µF
IN
OUT
IN
OUT
0.20
0.15
0.10
0.05
0
+125°C
+125°C
+25°C
–40°C
+25°C
–40°C
2.5
5.0
7.5
10.0
12.5
15.0
2.5
5.0
7.5
10.0
12.5
15.0
SUPPLY VOLTAGE (±V)
SUPPLY VOLTAGE (±V)
Figure 9. ADR821 Supply Current (−) vs. Supply Voltage
Figure 12. ADR827 Supply Current (−) vs. Supply Voltage
1.2
1.0
0.8
0.6
0.4
0.2
0
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
C
C
= 0.1µF
= 0.1µF
C
C
= 0.1µF
= 0.1µF
IN
OUT
IN
OUT
–40°C
+125°C
+25°C
+25°C
–40°C
+125°C
–3
–2
–1
0
1
2
3
4
5
6
7
–3
–2
–1
0
1
2
3
4
5
6
7
LOAD CURRENT (mA)
LOAD CURRENT (mA)
Figure 10. ADR821 Dropout vs. Load Current
Figure 13. ADR827 Dropout vs. Load Current
50
45
40
35
30
25
20
15
10
5
80
70
60
50
40
30
I
C
= 3mA
I
C
= 3mA
SINK
= C
SINK
= C
= 0.1µF
= 0.1µF
IN
OUT
IN
OUT
V
= 5V
S
V
= 15V
= 3V
S
V
= 15V
S
V
S
–40 –25 –10
5
20
35
50
65
80
95 110 125
–40 –25 –10
5
20
35
50
65
80
95 110 125
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 11. ADR821 Load Regulation vs. Temperature
Figure 14. ADR827 Load Regulation vs. Temperature
Rev. ± | Page 12 of 2±
ADR821/ADR827
0
–20
0
–20
I
C
= 5mA
I
C
= 5mA
SOURCE
= C
SOURCE
= C
= 0.1µF
= 0.1µF
IN
OUT
IN
OUT
V
= 3V
S
V
= 5V
S
–40
–40
V
= 15V
–60
–60
S
–80
–80
V
= 15V
S
–100
–120
–140
–100
–120
–140
–40 –25 –10
5
20
35
50
65
80
95 110 125
–40 –25 –10
5
20
35
50
65
80
95 110 125
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 15. ADR821 Load Regulation vs. Temperature
Figure 18. ADR827 Load Regulation vs. Temperature
C
= C = 0.1µF
OUT
C
= C = 0.1µF
OUT
IN
IN
8.3µV p-p
1.33µV rms
15.6µV p-p
2.78µV rms
1
1
TIME (1s/DIV)
TIME (1s/DIV)
Figure 16. ADR821 0.1 Hz to 10 Hz Noise
Figure 19. ADR827 0.1 Hz to 10 Hz Noise
C
= C = 0.1µF
OUT
C
= C = 0.1µF
OUT
IN
IN
258µV p-p
426µV p-p
34.6µV rms
55.6µV rms
1
1
TIME (1s/DIV)
TIME (1s/DIV)
Figure 17. ADR821 10 Hz to 10 kHz Noise
Figure 20. ADR827 10 Hz to 10 kHz Noise
Rev. ± | Page 13 of 2±
ADR821/ADR827
CHANNEL 2:
= 500mV/DIV
CHANNEL 2:
= 1V/DIV
V
V
OUT
OUT
2
2
CHANNEL 1:
CHANNEL 1:
V
= 2V/DIV
V
= 2V/DIV
IN
IN
C
C
= 0µF
= 0.1µF
C
C
= 0µF
= 0.1µF
IN
IN
1
1
L
L
TIME = 20µs/DIV
TIME = 20µs/DIV
Figure 21. ADR821 Turn-On Response
Figure 22. ADR827 Turn-On Response
Rev. ± | Page 1ꢀ of 2±
ADR821/ADR827
AMPLIFIER (AD821/AD827ꢁ
120
500
400
V
= ±15V
SY
T = 25°C
A
V
= ±15V
SY
= 25°C
T
A
100
80
60
40
20
0
300
200
100
0
–100
–200
–300
–400
–500
–500 –400 –300 –200 –100
0
100 200 300 400 500
–15 –12
–9
–6
–3
0
3
6
9
12
15
V
(µV)
V
(V)
OS
CM
Figure 23. Input Offset Voltage Distribution
Figure 26. Input Offset Voltage vs. Common-Mode Voltage
160
140
120
100
80
200
100
0
V
= ±15V
V
= ±15V
SY
SY
60
40
–100
–200
20
0
–5
–4
–3
–2
–1
0
1
2
3
4
5
–55 –40 –25 –10
5
20 35 50 65 80 95 110 125 140 155
TEMPERATURE (°C)
TCV (µV/°C)
OS
Figure 24. Offset Voltage Drift Distribution
Figure 27. Input Offset Voltage vs. Temperature
100000
10000
1000
100
60
50
V
T
= ±15V
SY
= 25°C
V
= ±15V
= 25°C
SY
A
T
A
40
30
20
V
V
SINKING
OL
10
– V
OH
SOURCING
0
SY
10
–10
–20
–30
–40
1
0.1
0.01
0.1
1
10
100
–13 –11 –9 –7 –5 –3 –1
1
3
5
7
9
11 13
V
(V)
LOAD CURRENT (mA)
CM
Figure 28. Output Swing Saturation Voltage vs. Load Current
Figure 25. Input Bias Current vs. Common-Mode Voltage
Rev. ± | Page 15 of 2±
ADR821/ADR827
70
120
105
90
140
120
100
80
V
T
= ±15V
V
T
= ±15V
SY
= 25°C
SY
= 25°C
A
A
50
75
PHASE
GAIN
30
60
45
10
30
60
15
–10
–30
–50
0
40
–15
–30
–45
–60
20
0
100
100
1k
10k
100k
1M
10M
100M
1k
10k
100k
1M
10M
100M
FREQUENCY (Hz)
FREQUENCY (Hz)
Figure 29. Open-Loop Gain and Phase vs. Frequency
Figure 32. CMRR vs. Frequency
50
40
140
120
100
80
V
T
= ±15V
V
T
= ±15V
SY
= 25°C
SY
= 25°C
G = 100
G = 10
G = 1
A
A
30
20
10
0
–10
–20
–30
–40
–50
–60
60
PSRR+
40
PSRR–
20
0
100
100
1k
10k
100k
1M
10M
100M
1k
10k
100k
1M
10M
100M
FREQUENCY (Hz)
FREQUENCY (Hz)
Figure 30. Closed-Loop Gain vs. Frequency
Figure 33. PSRR vs. Frequency
1200
1000
800
600
400
200
0
V
= ±15V
= 25°C
SY
R
C
= 10kꢀ
= 10pF
= ±15V
LOAD
LOAD
T
A
V
SY
2
G = 100
G = 10
G = 1
10
100
1k
10k
100k
1M
10M
TIME = 10µs/DIV
FREQUENCY (Hz)
Figure 31. ZOUT vs. Frequency
Figure 34. Large Signal Transient Response
Rev. ± | Page 16 of 2±
ADR821/ADR827
1000
100
10
V
T
= ±15V
R
C
= 10kꢀ
= 10pF
= ±15V
SY
= 25°C
L
A
L
V
SY
2
1
1
10
100
1000
10000
TIME = 1µs/DIV
FREQUENCY (Hz)
Figure 35. Small Signal Transient Response, CL = 10 pF
Figure 37. Voltage Noise Density
R
C
= 10kꢀ
= 100pF
L
L
V
= ±15V
SY
2
TIME = 1µs/DIV
Figure 36. Small Signal Transient Response, CL = 100 pF
Rev. ± | Page 17 of 2±
ADR821/ADR827
APPLICATIONS INFORMATION
fed to the amplifier noninverting input. The op amp is config-
ured 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 (ADR821ꢁ
REF_OUT
0.1µF
+2.5V
REF
V+
+IN
AMP_OUT
–2.5V
MULTIPLE 2.5 V OUTPUTS (ADR821ꢁ
V–
R
R
2
1
10kꢀ
10kꢀ
REF_OUT
0.1µF
2.5V
2.5V
Figure 38. +2.5 V and −2.5 V Outputs
REF
V+
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.
+IN
AMP_OUT
V–
10kꢀ
10kꢀ
R
1
R
2
–IN
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 con-
nected 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 con-
nected to the reference voltage, any perturbations appear as a
signal to the input of the voltage follower and appear on the
other output.
2.5 V AND 5.0 V OUTPUTS (ADR821ꢁ
REF_OUT
0.1µF
2.5V
5.0V
REF
V+
+IN
AMP_OUT
V–
R
R
2
1
10kꢀ
10kꢀ
–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
Rev. ± | Page 18 of 2±
ADR821/ADR827
OUTLINE DIMENSIONS
3.10
3.00
2.90
6
10
5.15
4.90
4.65
3.10
3.00
2.90
1
5
PIN 1
0.50 BSC
0.95
0.85
0.75
1.10 MAX
0.80
0.60
0.40
8°
0°
0.15
0.05
0.33
0.17
SEATING
PLANE
0.23
0.08
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
Initial
Accuracy
Output
Voltage
Temperature
Coefficient
(ppm/°C)
Temperature
Package
Description
Package
Ordering
Quantity Branding
Models
Range
(VOUT
)
Option
RM-10
RM-10
RM-10
RM-10
RM-10
RM-10
RM-10
RM-10
(mV)
(%)
0.40
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
10.00
10.00
5.00
5.00
5.00
5.00
2.50
2.50
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
1,000
250
R2G
R2G
R2H
R2H
R0Z
R0Z
R2B
R2B
0.40
0.20
0.20
0.40
0.40
0.20
0.20
1,000
250
1,000
250
1,000
250
1 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(0ꢁ
Rev. ± | Page 2± of 2±
相关型号：
ADR827BRMZ-REEL7
OP-AMP, 500 uV OFFSET-MAX, 1 MHz BAND WIDTH, PDSO10, ROHS COMPLIANT, MO-187-BA, MSOP-10
ROCHESTER
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