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Dual-Channel, Audio Difference Amplifier AD8273
FEATURES
Two gain settings Gain of 1/2 (-6 dB) Gain of 2 (+6 dB) 0.05% maximum gain error 10 ppm maximum gain drift Excellent ac specifications 20 V/s minimum slew rate 800 ns to 0.01% settling time Low distortion: 0.004%, 20 Hz to 20 kHz High accuracy dc performance 77 dB minimum CMRR 700 V maximum offset voltage 14-lead SOIC package Supply current: 2.5 mA maximum per channel Supply range: 2.5 V to 18 V
FUNCTIONAL BLOCK DIAGRAM
+VS
11 2
12k
6k
12
13
3 6
12k 12k
6k 6k
14 10
9
4
-VS
Figure 1.
APPLICATIONS
High performance audio Instrumentation amplifier building blocks Level translators Automatic test equipment Sin/Cos encoders
GENERAL DESCRIPTION
The AD8273 is a low distortion, dual-channel amplifier with internal gain setting resistors. With no external components, it can be configured as a high performance difference amplifier (G = 1/2 or 2), inverting amplifier (G = 1/2 or 2), or noninverting amplifier (G = 11/2 or 3). The AD8273 operates on both single and dual supplies and only requires 2.5 mA maximum supply current for each amplifier. It is specified over the industrial temperature range of -40C to +85C and is fully RoHS compliant.
Table 1. Difference Amplifiers by Category
Low Distortion AD8270 AD8273 AMP03 High Voltage AD628 AD629 Single-Supply Unidirectional AD8202 AD8203 Single-Supply Bidirectional AD8205 AD8206 AD8216
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 (c)2008 Analog Devices, Inc. All rights reserved.
06981-001
5
12k
6k
8
AD8273 TABLE OF CONTENTS
Features .............................................................................................. 1 Applications....................................................................................... 1 General Description ......................................................................... 1 Functional Block Diagram .............................................................. 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 4 Maximum Power Dissipation ..................................................... 4 ESD Caution.................................................................................. 4 Pin Configuration and Function Descriptions..............................5 Typical Performance Characteristics ..............................................6 Theory of Operation ...................................................................... 11 Configurations............................................................................ 11 Power Supplies ............................................................................ 11 Outline Dimensions ....................................................................... 13 Ordering Guide .......................................................................... 13
REVISION HISTORY
1/08--Revision 0: Initial Version
Rev. 0 | Page 2 of 16
AD8273 SPECIFICATIONS
VS = 15 V, VREF = 0 V, TA = 25C, G = 1/2, RL = 2 k, unless otherwise noted. Table 2.
Parameter DYNAMIC PERFORMANCE Bandwidth Slew Rate Settling Time to 0.1% Settling Time to 0.01% Channel Separation NOISE/DISTORTION 1 THD + Noise Noise Floor, RTO 2 Output Voltage Noise (Referred to Output) GAIN Gain Error Gain Drift Gain Nonlinearity INPUT CHARACTERISTICS Offset 3 vs. Temperature vs. Power Supply Common-Mode Rejection Ratio Input Voltage Range 4 Impedance 5 Differential Common Mode 6 OUTPUT CHARACTERISTICS Output Swing Short-Circuit Current Limit Capacitive Load Drive POWER SUPPLY Supply Current (per Amplifier) TEMPERATURE RANGE Specified Performance
1 2
Conditions
Min
Typ 20
Max
Unit MHz V/s ns ns dB % dBu V rms nV/Hz
20 10 V step on output, CL = 100 pF 10 V step on output, CL = 100 pF f = 1 kHz f = 1 kHz, VOUT = 10 V p-p, 600 load 20 kHz BW f = 20 Hz to 20 kHz f = 1 kHz 670 750 130 0.004 -106 3.5 26 0.05 10 750 800
-40C to +85C VOUT = 10 V p-p, 600 load VOUT = 5 V p-p, 600 load Referred to output -40C to +85C VS = 2.5 V to 18 V VCM = 40 V, RS = 0 , referred to input
2 200 50 100 3 2 86
% ppm/C ppm ppm V V/C V/V dB V k k
700 10 +3VS - 4.5
77 -3VS + 4.5
VCM = 0 V
36 9 -VS + 1.5 +VS - 1.5 100 60 200 1200 2.5 -40 +85
Sourcing Sinking G=1/2 G=2
V mA mA pF pF mA C
Includes amplifier voltage and current noise, as well as noise of internal resistors. dBu = 20 log (V rms /0.7746). 3 Includes input bias and offset current errors. 4 May also be limited by absolute maximum input voltage or by the output swing. See the Absolute Maximum Ratings section and Figure 9 through Figure 12 for details. 5 Internal resistors are trimmed to be ratio matched but have 20% absolute accuracy. 6 Common mode is calculated looking into both inputs. Common-mode impedance looking into only one input is 18 k.
Rev. 0 | Page 3 of 16
AD8273 ABSOLUTE MAXIMUM RATINGS
Table 3.
Parameter Supply Voltage Output Short-Circuit Current Voltage at Any Input Pin Differential Input Voltage Current into Any Input Pin Storage Temperature Range Specified Temperature Range Thermal Resistance JA JC Package Glass Transition Temperature (TG) Rating 18 V Observe derating curve 40 V 40 V 3 mA -65C to +130C -40C to +85C 105C/W 36C/W 150C
MAXIMUM POWER DISSIPATION
The maximum safe power dissipation for the AD8273 is limited by the associated rise in junction temperature (TJ) on the die. At approximately 150C, which is the glass transition temperature, the plastic changes its properties. Even temporarily exceeding this temperature limit may change the stresses that the package exerts on the die, permanently shifting the parametric performance of the amplifiers. Exceeding a temperature of 150C for an extended period can result in a loss of functionality. The AD8273 has built-in, short-circuit protection that limits the output current to approximately 100 mA (see Figure 2 for more information). While the short-circuit condition itself does not damage the part, the heat generated by the condition can cause the part to exceed its maximum junction temperature, with corresponding negative effects on reliability.
2.0 TJ MAX = 150C JA = 105C/W
MAXIMUM POWER DISSIPATION (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.
1.6
1.2
0.8
0.4
-25
0
25
50
75
100
125
AMBIENT TEMPERATURE (C)
Figure 2. Maximum Power Dissipation vs. Ambient Temperature
ESD CAUTION
Rev. 0 | Page 4 of 16
06981-043
0 -50
AD8273 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
NC 1 -12A 2 +12A 3 -VS 4
14 13
+6A OUTA -6A
AD8273
12
TOP VIEW 11 +VS (Not to Scale) +12B 5 10 -6B -12B 6 NC 7
9 8
OUTB
06981-020
+6B
NC = NO CONNECT
Figure 3. Pin Configuration
Table 4. Pin Function Descriptions
Pin No. 1, 7 2 3 4 5 6 8 9 10 11 12 13 14 Mnemonic NC -12A +12A -VS +12B -12B +6B OUTB -6B +VS -6A OUTA +6A Description No Connect. The 12 k resistor connects to the negative terminal of Op Amp A. The 12 k resistor connects to the positive terminal of Op Amp A. Negative Supply. The 12 k resistor connects to the positive terminal of Op Amp B. The 12 k resistor connects to the negative terminal of Op Amp B. The 6 k resistor connects to the positive terminal of Op Amp B. Op Amp B Output. The 6 k resistor connects to the negative terminal of Op Amp B. Positive Supply. The 6 k resistor connects to the negative terminal of Op Amp A. Op Amp A Output. The 6 k resistor connects to the positive terminal of Op Amp A.
Rev. 0 | Page 5 of 16
AD8273 TYPICAL PERFORMANCE CHARACTERISTICS
VS = 15 V, TA = 25C, G = 1/2, difference amplifier configuration, unless otherwise noted.
100 N: 1641 MEAN: -9.5 SD: 228.4 500 400 300
SYSTEM OFFSET (V)
80
200 100 0 -100 -200 -300 -400 60 75 90 105 120
06981-030
06981-041
HITS
60
40
20
06981-036
0
-500
-250
0 VOSO 15V (V/V)
250
500
REPRESENTATIVE SAMPLES -500 -45 -30 -15 0 15 30 45
TEMPERATURE (C)
Figure 4. Typical Distribution of System Offset Voltage, G = 1/2, Referred to Output
N: 1649 MEAN: -0.59 SD: 37.3
Figure 7. System Offset vs. Temperature, Normalized at 25C, Referred to Output
150 100 50 0 -50 -100 -150 REPRESENTATIVE SAMPLES -200 -45 -30 -15 0 15 30 45
120 100 80
60 40 20 0 -150
GAIN ERROR (V/V)
HITS
-100
-50
0
50
100
150
60
75
90
105 120
CMRR 15V (V/V)
TEMPERATURE (C)
Figure 5. Typical Distribution of CMRR, G = 1/2, Referred to Input
70 60
INPUT COMMON-MODE VOLTAGE (V)
Figure 8. Gain Error vs. Temperature, Normalized at 25C
50 0, +40 40 30 -13.5, +26.5 20 10 0 -10 -20 -30 -40 0, -40 -13.5, -26.5
+13.5, -26.5
G=1/2
50 40 30 20
+13.5, +26.5
CMRR (V/V)
10 0 -10 -20 -30 -40 -50 -60 -70 -80 -45 -30 -15 REPRESENTATIVE SAMPLES 0 15 30 45 60 75 90 105 120
06981-029
-50 -15
-10
TEMPERATURE (C)
-5 0 5 OUTPUT VOLTAGE (V)
10
15
Figure 6. CMRR vs. Temperature, Normalized at 25C
Figure 9. Input Common-Mode Voltage vs. Output Voltage, Gain = 1/2, 15 V Supplies
Rev. 0 | Page 6 of 16
06981-031
06981-028
AD8273
18 15
INPUT COMMON-MODE VOLTAGE (V)
-3.5, +14 5V SUPPLIES
G=1/2
POWER SUPPLY REJECTION (dB)
140 POSITIVE PSRR 120 100 80 60 40 20 0 NEGATIVE PSRR
12 9 6 3 0 -3 -6 -9 -12 -15 -18 -4 -3 -2 -3.5,-7 -1, -2
+3.5, +7 -1, +4 +1, +2 2.5V SUPPLIES +1, -4
+3.5, -14 -1 0 1 2 3 4
06981-003
OUTPUT VOLTAGE (V)
FREQUENCY (Hz)
Figure 10. Input Common-Mode Voltage vs. Output Voltage, Gain = 1/2, 5 V and 2.5 V Supplies
50 0, +40
INPUT COMMON-MODE VOLTAGE (V)
Figure 13. Power Supply Rejection vs. Frequency, G = 1/2, Referred to Output
32
G=2 +13.5, +36.25
MAXIMUM OUTPUT VOLTAGE (V p-p)
40 30 20 10 0 -10 -20 -30 -40 0, -40 -10 -5 0 5 OUTPUT VOLTAGE (V) 10 15
06981-042
15V SUPPLY 28 24 20 16 12 8 4 0 100 5V SUPPLY
-13.5, +36.25
-13.5, -36.25
+13.5, -36.25
-50 -15
1k
10k
100k
1M
10M
FREQUENCY (Hz)
Figure 11. Input Common-Mode Voltage vs. Output Voltage, Gain = 2, 15 V Supplies
8
INPUT COMMON-MODE VOLTAGE (V) 10
Figure 14. Maximum Output Voltage vs. Frequency
6 4 2 0 -2 -4 -6 -8 -4
-3.5, +6.125 5V SUPPLIES
G=2
5
G=2
+3.5, +4.375 -1, +1.175 +1, +1.25
0
2.5V SUPPLIES -1, -1.25 -3.5, -4.375 +1, -1.175
GAIN (dB)
-5
G=1/2
-10
-15
+3.5, -6.125 -3 -2 -1 0 1 2 3 4
06981-005
-20 100
1k
10k
100k
1M
10M
100M
OUTPUT VOLTAGE (V)
FREQUENCY(Hz)
Figure 12. Input Common-Mode Voltage vs. Output Voltage, Gain = 2, 5 V and 2.5 V Supplies
Figure 15. Gain vs. Frequency
Rev. 0 | Page 7 of 16
06981-007
06981-006
06981-021
1
10
100
1k
10k
100k
1M
AD8273
120
+VS -40C +25C
COMMON-MODE REJECTION (dB)
GAIN = 1/2
OUTPUT VOLTAGE (V)
100
GAIN = 2
+VS - 3
+VS - 6
+125C
+85C
80
-VS + 6
+125C +85C +25C
60
-VS + 3
1k
10k FREQUENCY (Hz)
100k
1M
06981-022
CURRENT (mA)
Figure 16. Common-Mode Rejection vs. Frequency, Referred to Input
120 100 80 60
CURRENT (mA)
Figure 19. Output Voltage vs. IOUT
ISHORT+
CLOAD = 100pF
40
50mV/DIV
20 0 -20 -40 -60 -80 ISHORT-
NO LOAD 600 2k
-120 -40
-20
0
20
40
60
80
100
120
1s/DIV
TEMPERATURE (C)
Figure 17. Short-Circuit Current vs. Temperature
+VS
Figure 20. Small Signal Step Response, Gain = 2
+125C
+85C +25C
CLOAD = 100pF
OUTPUT VOLTAGE SWING (V)
+VS - 2
-40C
+VS - 4
50mV/DIV
0
-VS + 2
+125C
NO LOAD 600 2k
-VS + 4
06981-025
-VS
-40C +25C +85C
200
1k RLOAD ()
10k
06981-009
1s/DIV
Figure 18. Output Voltage Swing vs. RLOAD, VS = 15 V
Figure 21. Small Signal Step Response, Gain = 1/2
Rev. 0 | Page 8 of 16
06981-024
-100
06981-008
06981-023
40 100
-VS
-40C 0 20 40 60 80 100
AD8273
100 90 80 70
2.5V
5V 15V 18V
OVERSHOOT (%)
06981-026
50mV/DIV
60 50 40 30 20 10 0 20 40 60 80 100
1s/DIV
120
140
160
180
200
CAPACITANCE (pF)
Figure 22. Small Signal Pulse Response with 500 pF Capacitor Load, Gain = 2
100 90 80 70
Figure 25. Small Signal Overshoot vs. Capacitive Load, G = 1/2, 600 in Parallel with Capacitive Load
OVERSHOOT (%)
50mV/DIV
60 50
2.5V 5V 18V
15V
40 30 20 10
06981-027
1s/DIV
0
200
400
600
800
1000
1200
CAPACITANCE (pF)
Figure 23. Small Signal Pulse Response for 100 pF Capacitive Load, Gain = 1/2
100 90 80 70 2.5V 5V
Figure 26. Small Signal Overshoot vs. Capacitive Load, G = 2, No Resistive Load
100 90 80 70
OVERSHOOT (%)
OVERSHOOT (%)
15V 18V
60 50 40 30 20 10
60 50 40 30 20 10 18V
2.5V
5V 15V
06981-037
0
20
40
60
80
100
120
140
160
180
200
0
200
400
600
800
1000
1200
CAPACITANCE (pF)
CAPACITANCE (pF)
Figure 24. Small Signal Overshoot vs. Capacitive Load, G = 1/2, No Resistive Load
Figure 27. Small Signal Overshoot vs. Capacitive Load, G = 2, 600 in Parallel with Capacitive Load
Rev. 0 | Page 9 of 16
06981-040
0
0
06981-039
0
06981-038
0
AD8273
0.1
0.01
THD + N (%)
2V/DIV
GAIN = 1/2
GAIN = 2
0.001
06981-032
1s/DIV
20
200 FREQUENCY (Hz)
2k
20k
Figure 28. Large Signal Pulse Response Gain = 1/2
10000
Figure 31. THD+N vs. Frequency, VOUT = 10 V p-p
VOLTAGE NOISE DENSITY (nV/Hz)
1000
2V/DIV
100
GAIN = 2
GAIN = 1/2 10 FREQUENCY (Hz)
06981-034
06981-033
1s/DIV
1
10
100
1k
10k
100k
Figure 29. Large Signal Pulse Response, Gain = 2
40 35 30
Figure 32. Voltage Noise Density vs. Frequency, Referred to Output
G=2
SLEW RATE (V/S)
25 20
-SR 15 10
06981-010
1V/DIV
+SR
G=1/2
5 0 -40
-20
0
20
40
60
80
100
120
TEMPERATURE (C)
1s/DIV
Figure 30.Slew Rate vs. Temperature
Figure 33. 0.1 Hz to 10 Hz Voltage Noise, RTO
Rev. 0 | Page 10 of 16
06981-035
06981-011
0.0001
AD8273 THEORY OF OPERATION
The AD8273 has two channels, each consisting of a high precision, low distortion op amp and four trimmed resistors. Although such a circuit can be built discretely, placing the resistors on the chip offers advantages to board designers that include better dc specifications, better ac specification, and lower production costs. The resistors on the AD8273 are laser trimmed and tightly matched. Specifications that depend on the resistor matching, such as gain drift, common-mode rejection, and gain accuracy, are better than can be achieved with standard discrete resistors. The positive and negative input terminals of the AD8273 op amp are not pinned out intentionally. Keeping these nodes internal means their capacitance is considerably lower than it would be in discrete designs. Lower capacitance at these nodes means better loop stability and improved common-mode rejection vs. frequency. The internal resistors of the AD8273 lower production cost. One part rather than several is placed on the board, which improves both board build time and reliability.
-IN1 12 6k 12k 2 13 OUT1
+IN1
14
6k
12k
3
-IN2
10
6k
12k
6 9 OUT2
+IN2
8
6k
12k
5
06981-016
VOUT = 2 (VIN+ - VIN-)
Figure 35. Difference Amplifier, G = 2
2 12k 6k 12 13 OUT1
IN1
14
6k
3 12k
CONFIGURATIONS
The AD8273 can be configured in several different ways; see Figure 34 to Figure 41. Because these configurations rely on the internal, matched resistors, these configurations have excellent gain accuracy and gain drift.
IN2
6 12k
6k
10 9 OUT2
8
6k
5 12k
06981-013
POWER SUPPLIES
A stable dc voltage should be used to power the AD8273. Noise on the supply pins can adversely affect performance. A bypass capacitor of 0.1 F should be placed between each supply pin and ground, as close to each pin as possible. A tantalum capacitor of 10 F should also be used between each supply and ground. It can be farther away from the AD8273 and typically can be shared by other precision integrated circuits. The AD8273 is specified at 15 V, but it can be used with unbalanced supplies as well, for example, -VS = 0 V, +VS = 20 V. The difference between the two supplies must be kept below 36 V.
-IN1 2 12k 6k 12 13 OUT1
VOUT = -1/2 VIN
Figure 36. Inverting Amplifier, G = 1/2
12 6k 12k 2 13 OUT1
IN1
3 12k 14 6k
IN2
10
6k
12k
6 9 OUT2
5 12k 8 6k
VOUT = -2 VIN
+IN1
3 12k
6k
14
Figure 37. Inverting Amplifier, G = 2
-IN2
6 12k
6k
10 9 OUT2
+IN2
5 12k
6k
8
06981-012
VOUT = 1/2 (VIN+ - VIN-)
Figure 34. Difference Amplifier, G = 1/2
Rev. 0 | Page 11 of 16
06981-017
AD8273
2 12k 6k 12 13 OUT1
2 12k
6k
12 13 OUT1
14
IN1 3 12k 6k 14
6k
IN1
3 12k
6 12k
6k
10 9 OUT2
6 12k
6k
10 9 OUT2
8
IN2 5 12k 6k 8
06981-015
6k
IN2
5 12k
06981-014
VOUT = 1/2 VIN
VOUT = 11/2 VIN
Figure 38. Noninverting Amplifier, G = 1/2
12 6k 12k 2 13 OUT1
Figure 40. Noninverting Amplifier, G = 1.5
12 6k 12k 2 13 3 12k IN1 OUT1
IN1
14
6k
12k
3
14
6k
10
6k
12k
6 9 OUT2
10
6k
12k
6 9 OUT2
5 12k
IN2
8
6k
12k
5
06981-019
IN2
8
6k
06981-018
VOUT = 2 VIN
VOUT = 3 VIN
Figure 39. Noninverting Amplifier, G = 2
Figure 41. Noninverting Amplifier, G = 3
Rev. 0 | Page 12 of 16
AD8273 OUTLINE DIMENSIONS
8.75 (0.3445) 8.55 (0.3366)
14 1 8 7
4.00 (0.1575) 3.80 (0.1496)
6.20 (0.2441) 5.80 (0.2283)
1.27 (0.0500) BSC 0.25 (0.0098) 0.10 (0.0039) COPLANARITY 0.10 0.51 (0.0201) 0.31 (0.0122)
1.75 (0.0689) 1.35 (0.0531) SEATING PLANE
0.50 (0.0197) 0.25 (0.0098) 8 0 0.25 (0.0098) 0.17 (0.0067) 1.27 (0.0500) 0.40 (0.0157)
45
COMPLIANT TO JEDEC STANDARDS MS-012-AB CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN.
Figure 42. 14-Lead Standard Small Outline Package [SOIC_N] Narrow Body (R-14) Dimensions shown in millimeters and (inches)
ORDERING GUIDE
Model AD8273ARZ 1 AD8273ARZ-R71 AD8273ARZ-RL1
1
Temperature Range -40C to +85C -40C to +85C -40C to +85C
Package Description 14-Lead SOIC_N 14-Lead SOIC_N, 7" Tape and Reel 14-Lead SOIC_N, 13" Tape and Reel
060606-A
Package Option R-14 R-14 R-14
Z = RoHS Compliant Part.
Rev. 0 | Page 13 of 16
AD8273 NOTES
Rev. 0 | Page 14 of 16
AD8273 NOTES
Rev. 0 | Page 15 of 16
AD8273 NOTES
(c)2008 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D06981-0-1/08(0)
Rev. 0 | Page 16 of 16

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