LM1596/LM1496 Balanced Modulator-Demodulator General Description Features The LM1596/LM1496 are doubled balanced modulator-demodulators which produce an output voltage proportional to the product of an input (signal) voltage and a switching (carrier) signal. Typical applications include suppressed carrier modulation, amplitude modulation, synchronous detection, FM or PM detection, broadband frequency doubling and chopping. The LM1596 is specified for operation over the b55§ C to a 125§ C military temperature range. The LM1496 is specified for operation over the 0§ C to a 70§ C temperature range. Y Y Y Y Y Excellent carrier suppression 65 dB typical at 0.5 MHz 50 dB typical at 10 MHz Adjustable gain and signal handling Fully balanced inputs and outputs Low offset and drift Wide frequency response up to 100 MHz Schematic and Connection Diagrams Metal Can Package TL/H/7887 – 2 Top View Note: Pin 10 is connected electrically to the case through the device substrate. Order Number LM1496H or LM1596H See NS Package Number H08C TL/H/7887 – 1 Dual-In-Line and Small Outline Packages Numbers in parentheses show DIP connections. TL/H/7887 – 3 Order Number LM1496M or LM1496N See NS Package Number M14A or N14A C1995 National Semiconductor Corporation TL/H/7887 RRD-B30M115/Printed in U. S. A. LM1596/LM1496 Balanced Modulator-Demodulator February 1995 Absolute Maximum Ratings Soldering Information If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications. Internal Power Dissipation (Note 1) Applied Voltage (Note 2) Differential Input Signal (V7 b V8) # Dual-In-Line Package # Small Outline Package Vapor Phase (60 seconds) 215§ C Infrared (15 seconds) 220§ C See AN-450 ‘‘Surface Mounting Methods and their effects on Product Reliability’’ for other methods of soldering surface mount devices. g 5.0V g (5 a I5R0)V Differential Input Signal (V4 b V1) 5.0V Input Signal (V2 b V1, V3 b V4) 12 mA Bias Current (I5) Operating Temperature Range LM1596 b55§ C to a 125§ C LM1496 0§ C to a 70§ C Storage Temperature Range 260§ C Soldering (10 seconds) 500 mW 30V b 65§ C to a 150§ C Electrical Characteristics (TA e 25§ C, unless otherwise specified, see test circuit) Parameter LM1596 Conditions LM1496 Units Min Typ Max Min Typ Max Carrier Feedthrough Carrier Suppression Transadmittance Bandwidth VC e 60 mVrms sine wave fC e 1.0 kHz, offset adjusted VC e 60 mVrms sine wave fC e 10 kHz, offset adjusted VC e 300 mVpp square wave fC e 1.0 kHz, offset adjusted VC e 300 mVpp square wave fC e 1.0 kHz, not offset adjusted fS e 10 kHz, 300 mVrms fC e 500 kHz, 60 mVrms sine wave offset adjusted fS e 10 kHz, 300 mVrms fC e 10 MHz, 60 mVrms sine wave offset adjusted 50 RL e 50X Carrier Input Port, VC e 60 mVrms sine wave fS e 1.0 kHz, 300 mVrms sine wave Signal Input Port, VS e 300 mVrms sine wave V7 b V8 e 0.5Vdc 40 40 mVrms 140 140 mVrms 0.04 0.2 0.04 0.2 mVrms 20 100 20 150 mVrms 65 50 65 dB 50 50 dB 300 300 MHz 80 80 MHz 3.5 V/V Voltage Gain, Signal Channel VS e 100 mVrms, f e 1.0 kHz V7 b V8 e 0.5 Vdc Input Resistance, Signal Port f e 5.0 MHz V7 b V8 e 0.5 Vdc 200 200 kX Input Capacitance, Signal Port f e 5.0 MHz V7 b V8 e 0.5 Vdc 2.0 2.0 pF Single Ended Output Resistance f e 10 MHz 40 40 kX Single Ended Output Capacitance f e 10 MHz 5.0 5.0 pF Input Bias Current (I1 a I4)/2 12 25 12 30 Input Bias Current (I7 a I8)/2 12 25 12 30 mA Input Offset Current (I1 b I4) 0.7 5.0 0.7 5.0 mA Input Offset Current (I7 b I8) 0.7 5.0 5.0 5.0 Average Temperature Coefficient of Input Offset Current (b55§ C k TA k a 125§ C) (0§ C k TA k a 70§ C) 2.0 Output Offset Current (I6 b I9) 14 Average Temperature Coefficient of Output Offset Current (b55§ C k TA k a 125§ C) (0§ C k TA k a 70§ C) 90 2.5 3.5 2.5 14 90 2 mA nA/§ C nA/§ C 2.0 50 mA 60 mA nA/§ C nA/§ C Electrical Characteristics (TA e 25§ C, unless otherwise specified, see test circuit) (Continued) Parameter LM1596 Conditions Min Signal Port Common Mode Input Voltage Range fS e 1.0 kHz Signal Port Common Mode Rejection Ratio V7 b V8 e 0.5 Vdc Typ LM1496 Max Min Typ Units Max 5.0 5.0 Vp-p b 85 b 85 dB Common Mode Quiescent Output Voltage 8.0 8.0 Vdc Differential Output Swing Capability 8.0 8.0 Vp-p Positive Supply Current Negative Supply Current (I6 a Ig) (I10) Power Dissipation 2.0 3.0 2.0 3.0 mA 3.0 4.0 3.0 4.0 mA 33 33 mW Note 1: LM1596 rating applies to case temperatures to a 125§ C; derate linearly at 6.5 mW/§ C for ambient temperature above 75§ C. LM1496 rating applies to case temperatures to a 70§ C. Note 2: Voltage applied between pins 6-7, 8-1, 9-7, 9-8, 7-4, 7-1, 8-4, 6-8, 2-5, 3-5. Note 3: Refer to rets1596x drawing for specifications of military LM1596H versions. Typical Performance Characteristics Carrier Suppression vs Carrier Input Level Carrier Suppression vs Frequency Carrier Feedthrough vs Frequency Sideband Output vs Carrier Levels Sideband and Signal Port Transadmittances vs Frequency Signal-Port Frequency Response TL/H/7887 – 5 3 Typical Application and Test Circuit Suppressed Carrier Modulator Numbers in parentheses show DIP connections. TL/H/7887 – 4 Note: S1 is closed for ‘‘adjusted’’ measurements. SSB Product Detector Numbers in parentheses show DIP connections. TL/H/7887 – 6 This figure shows the LM1596 used as a single sideband (SSB) suppressed carrier demodulator (product detector). The carrier signal is applied to the carrier input port with sufficient amplitude for switching operation. A carrier input level of 300 mVrms is optimum. The composite SSB signal is applied to the signal input port with an amplitude of 5.0 to 500 mVrms. All output signal components except the desired demodulated audio are filtered out, so that an offset adjustment is not required. This circuit may also be used as an AM detector by applying composite and carrier signals in the same manner as described for product detector operation. 4 Typical Applications (Continued) Broadband Frequency Doubler Numbers in parentheses show DIP connections. TL/H/7887 – 7 The frequency doubler circuit shown will double low-level signals with low distortion. The value of C should be chosen for low reactance at the operating frequency. Signal level at the carrier input must be less than 25 mV peak to maintain operation in the linear region of the switching differential amplifier. Levels to 50 mV peak may be used with some distortion of the output waveform. If a larger input signal is available a resistive divider may be used at the carrier input, with full signal applied to the signal input. 5 6 Physical Dimensions inches (millimeters) Metal Can Package (H) Order Number LM1496H or LM1596H NS Package Number H08C Molded Small Outline Package (M) Order Number LM1496M NS Package Number M14A 7 LM1596/LM1496 Balanced Modulator-Demodulator Physical Dimensions inches (millimeters) (Continued) Molded Dual-In-Line Package (N) Order Number LM1496N NS Package Number N14A LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. 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