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a FEATURES High Common-Mode Rejection DC: 100 dB typ 60 Hz: 100 dB typ 20 kHz: 70 dB typ 40 kHz: 62 dB typ Low Distortion: 0.001% typ Fast Slew Rate: 9.5 V/ s typ Wide Bandwidth: 3 MHz typ Low Cost Complements SSM2142 Differential Line Driver APPLICATIONS Line Receivers Summing Amplifiers Buffer Amplifiers-Drives 600 High Common-Mode Rejection Differential Line Receiver SSM2141 FUNCTIONAL BLOCK DIAGRAM 25k -IN 2 25k 5 SENSE 7 +VCC SSM2141 6 OUTPUT 4 -VEE 25k +IN 3 25k 1 REFERENCE Load PIN CONNECTIONS 8-Pin Plastic Mini-DIP (P Suffix) Narrow Body SO (S Suffix) REFERENCE 1 -IN 2 +IN 3 8 NC GENERAL DESCRIPTION The SSM2141 is an integrated differential amplifier intended to receive balanced line inputs in audio applications requiring a high level of noise immunity and optimum common-mode rejection. The SSM2141 typically achieves 100 dB of commonmode rejection (CMR), whereas implementing an op amp with four off-the-shelf precision resistors will typically achieve only 40 dB of CMR--inadequate for high-performance audio. The SSM2141 achieves low distortion performance by maintaining a large slew rate of 9.5 V/s and high open-loop gain. Distortion is less than 0.002% over the full audio bandwidth. The SSM2141 complements the SSM2142 balanced line driver. Together, these devices comprise a fully integrated solution for equivalent transformer balancing of audio signals without the problems of distortion, EMI fields, and high cost. Additional applications for the SSM2141 include summing signals, differential preamplifiers, and 600 low distortion buffer amplifiers. For similar performance with G = 1/2, see SSM2143. SSM2141 7 V+ 6 OUTPUT TOP VIEW (Not to Scale) 5 SENSE V- 4 NC = NO CONNECT REV. B 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 which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703 SSM2141-SPECIFICATIONS ELECTRICAL CHARACTERISTICS Parameter OFFSET VOLTAGE GAIN ERROR INPUT VOLTAGE RANGE COMMON-MODE REJECTION POWER SUPPLY REJECTION RATIO OUTPUT SWING SHORT-CIRCUIT CURRENT LIMIT SMALL-SIGNAL BANDWIDTH (-3 dB) SLEW RATE TOTAL HARMONIC DISTORTION THD CAPACITIVE LOAD DRIVE CAPABILITY CL SUPPLY CURRENT NOTES 1 Input Voltage Range Guaranteed by CMR test. Specifications subject to change without notice (@ VS = Symbol VOS 18 V, TA = +25 C, unless otherwise noted) Conditions VCM = 0 V No Load, VIN = 10 V, RS = 0 Min -1000 SSM2141 Typ Max 25 1000 Units V % V 100 0.7 13 +45/-15 3 6 9.5 0.001 0.01 300 2.5 3.5 14.7 15 dB V/V V mA MHz V/s % pF mA 0.001 0.01 10 80 IVR CMR PSRR VO ISC BW SR (Note 1) VCM = 10 V VS = 6 V to 18 V RL = 2 k Output Shorted to Ground RL = 2 k RL = 2 k RL = 100 k RL = 600 No Oscillation No Load ISY ELECTRICAL CHARACTERISTICS (@ V = S 18 V, -40 C TA +85 C) Conditions VCM = 0 V No Load, VIN = 10 V, RS = 0 Min -2500 Typ 200 Max 2500 Units V % V 90 1.0 13 14.7 9.5 2.6 4.0 20 dB V/V V V/s mA Parameter OFFSET VOLTAGE GAIN ERROR INPUT VOLTAGE RANGE COMMON-MODE REJECTION POWER SUPPLY REJECTION RATIO OUTPUT SWING SLEW RATE SUPPLY CURRENT NOTES 1 Input Voltage Range Guaranteed by CMR test. Specifications subject to change without notice Symbol VOS 0.002 0.02 10 75 IVR CMR PSRR VO SR ISY (Note 1) VCM = 10 V VS = 6 V to 18 V RL = 2 k RL = 2 k No Load -2- REV. B SSM2141 ABSOLUTE MAXIMUM RATINGS 1 Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 V Input Voltage1 . . . . . . . . . . . . . . . . . . . . . . . . Supply Voltage Output Short-Circuit Duration . . . . . . . . . . . . . . Continuous Storage Temperature Range P Package . . . . . . . . . . . . . . . . . . . . . . . -65C to +150C Lead Temperature (Soldering, 60 sec) . . . . . . . . . . . . +300C Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . +150C Operating Temperature Range . . . . . . . . . . . . -40C to +85C Package Type 8-Pin Plastic DIP (P) JA 2 JC Units C/W 103 43 NOTES 1 For supply voltages less than 18 V, the absolute maximum input voltage is equal to the supply voltage. 2 JA is specified for worst case mounting conditions, i.e., JA is specified for device in socket for P-DIP package. ORDERING GUIDE Operating Temperature Range XIND (-40C TA +85C) XIND (-40C TA +85C) Package Description 8-Pin Plastic DIP 8-Pin Narrow Body SO Package Option N-8 SO-8 Model SSM2141P SSM2141S Typical Performance Characteristics Small Signal Transient Response Large Signal Transient Response Common-Mode Rejection vs. Frequency Power Supply Rejection vs. Frequency Total Harmonic Distortion vs. Frequency Dynamic Intermodulation Distortion vs. Frequency REV. B -3- SSM2141-Typical Performance Characteristics Input Offset Voltage vs. Temperature Closed-Loop Gain vs. Frequency Closed-Loop Output Impedance vs. Frequency Gain Error vs. Temperature Slew Rate vs. Temperature Supply Current vs. Temperature Supply Current vs. Supply Voltage Maximum Output Voltage vs. Output Current (Source) Maximum Output Voltage vs. Output Current (Sink) -4- REV. B SSM2141 5mV 1S +1V 0V -1V 0.1 TO 10Hz PEAK-TO-PEAK NOISE Voltage Noise Density vs. Frequency Low Frequency Voltage Noise 10mV 1mS 10mV 2mS +10V 0V -10V TA = +25C VS = 15V NOTE: EXTERNAL AMPLIFIER GAIN = 1000; THEREFORE, VERTICAL SCALE = 10V/DIV. TA = +25C VS = 15V NOTE: EXTERNAL AMPLIFIER GAIN = 1000; THEREFORE, VERTICAL SCALE = 10V/DIV. +10V 0V -10V Voltage Noise from 0 kHz to 1 kHz Voltage Noise from 0 kHz to 10 kHz APPLICATIONS INFORMATION The SSM2141 represents a versatile analog building block. In order to capitalize on fast settling time, high slew rate, and high CMR, proper decoupling and grounding techniques must be employed. For decoupling, place 0.1 F capacitor located within close proximity from each supply pin to ground. Slew Rate Test Circuit REV. B -5- SSM2141 MAINTAINING COMMON-MODE REJECTION Figure 5. Suitable Instrumentation Amplifier Requirements can be Addressed by Using an Input Stage Consisting of A1, A2, R1 and R2 OUTLINE DIMENSIONS Dimensions shown in inches and (mm). Figure 1. Precision Difference Amplifier. Rejects [E1 +E 2 ] Common-Mode Signal = by 100 dB 2 8-Pin Epoxy Mini-DIP P-Suffix (N-8) 0.430 (10.92) 0.348 (8.84) 8 5 0.280 (7.11) 0.240 (6.10) 1 4 PIN 1 0.210 (5.33) MAX 0.160 (4.06) 0.115 (2.93) 0.060 (1.52) 0.015 (0.38) 0.130 (3.30) MIN SEATING PLANE 0.325 (8.25) 0.300 (7.62) 0.195 (4.95) 0.115 (2.93) Figure 2. Precision Unity Gain Inverting Amplifier 0.022 (0.558) 0.100 0.070 (1.77) 0.014 (0.356) (2.54) 0.045 (1.15) BSC 0.015 (0.381) 0.008 (0.204) 8-Pin Narrow Body SO S-Suffix (SO-8) 0.1968 (5.00) 0.1890 (4.80) Figure 3. Precision Summing Amplifier 0.1574 (4.00) 0.1497 (3.80) 8 1 5 4 0.2440 (6.20) 0.2284 (5.80) PIN 1 0.0098 (0.25) 0.0040 (0.10) 0.0688 (1.75) 0.0532 (1.35) 0.0196 (0.50) x 45 0.0099 (0.25) SEATING PLANE 0.0500 0.0192 (0.49) (1.27) 0.0138 (0.35) BSC 0.0098 (0.25) 0.0075 (0.19) 8 0 0.0500 (1.27) 0.0160 (0.41) Figure 4. Precision Summing Amplifier with Gain -6- REV. B PRINTED IN U.S.A. C1532-2.5-5/91 In order to achieve the full common-mode rejection capability of the SSM2141, the source impedance must be carefully controlled. Slight imbalances of the source resistance will result in a degradation of DC CMR--even a 5 imbalance will degrade CMR by 20 dB. Also, the matching of the reactive source impedance must be matched in order to preserve the CMRR over frequency. |
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