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Preliminary Technical Data
FEATURES
Two gain settings: Gain of 1/2 (-6 dB) Gain of 2 (6 dB) 0.03% max gain accuracy 10 ppm max gain drift Excellent AC Specifications 25V/s slew rate 0.9 s to 0.01% settling time Low Distortion 0.003% at 1 kHz High Accuracy DC Performance 90 dB typ CMRR 250 uV max offset voltage 14 lead SOIC Package Supply current: 2.5 mA per channel Supply range: 2.5 V to 18 V
Dual-Channel Audio Difference Amplifier AD8273
FUNCTIONAL BLOCK DIAGRAM
+VS
11
-IN1
2 12k 6k
12
SENSE1
- + +IN1 -IN2
3 6 12k 6k 12k 6k
13
OUT1
14 10
REF1 SENSE2
APPLICATIONS
High Performance Audio Instrumentation Amplifier Building Block Level Translator Automatic Test Equipment Sin/Cos Encoders
- + +IN2
5 12k 4 6k
9
OUT2
8
REF2
-VS
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=0.5 or 2), inverting amplifier (G=0.5 or 2) or non-inverting amplifier (G=1.5 or 3). The AD8273 operates on both single and dual supplies and only requires 2.5 mA maximum supply current for both amplifiers. It is specified over the industrial temperature range of -40C to +85C and is fully RoHS compliant.
Figure 1. AD8273 Dual Difference Amplifier
Table 1. Difference Amplifiers by Category
Low Distortion AD8270 AD8273 AMP03 High Voltage AD628 AD629 AD8212 Single Supply Uni-directional AD8202 AD8203 Single Supply Bi-directional AD8205 AD8206 AD8210
Rev. PrA
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)2007 Analog Devices, Inc. All rights reserved.
AD8273 SPECIFICATIONS
VS = 18 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/DISTORTION1 THD + Noise Noise Floor, RTO Output Voltage Noise (referred to input) GAIN Gain Error Gain Drift Gain Nonlinearity INPUT CHARACTERISTICS Offset3 vs. Temperature vs. Power Supply Common Mode Rejection Ratio Input Voltage Range Impedance Differential Common Mode4 OUTPUT CHARACTERISTICS Output Swing Short circuit current limit Capacitive Load Drive POWER SUPPLY Supply Current (per Amplifier) TEMPERATURE RANGE Specified Performance Conditions Min
Preliminary Technical Data
Typ 12 25 0.7 0.9 130 0.003 -120 3 20
Max
Unit MHz V/s s s dB % dBu2 Vrms nV/Hz
10V Step on output, CL=100 pF 10V Step on output, CL=100 pF f = 1 kHz f = 1 kHz, VIN= 10 Vrms 20 kHz BW f = 20 Hz to 20 kHz f = 1 kHz
1 10 200 2 5 86
0.03 10
% ppm/C ppm V V/C V/V dB V k k
400 20
VCM=18V, RS=0, referred to input
77 -Vs-0.5
+VS+0.5 24 9
-Vs+1.5 60 100
+ VS -1.5
V mA pF mA
2.5 -40 85
1 2
Includes amplifier voltage noise, resistor network voltage noise, and amplifier current noise through resistor network dBu = 20log(Vrms/0.7746) 3 Includes effects of amplifier's input bias and offset currents 4 Calculated looking into both inputs. Common mode impedance looking into only one input is 18 k
Rev. PrA| Page 2 of 4
Preliminary Technical Data ABSOLUTE MAXIMUM RATINGS
Table 3.
Parameter Supply Voltage Output Short-Circuit Current Input Voltage (Common Mode) Differential Input Voltage Storage Temperature Range Specified Temperature Range Thermal Resistance JA Thermal Resistance JC Package Glass Transition Temperature (TG) Rating TBD Indefinite TBD TBD -65C to +130C -40C to +85C 120 C/W 36 C/W 130C
AD8273
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 130C, 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 130C for an extended period can result in a loss of functionality.
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 may affect device reliability.
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although this product features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality.
Rev. PrA| Page 3 of 4
AD8273 OUTLINE DIMENSIONS
Preliminary Technical Data
Figure 2. 14 Lead Narrow Body SOIC package
(c)2007 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. PR06981-0-8/07(PrA)
Rev. PrA| Page 4 of 4

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