Ground Noise Isolation Amplifier GENERAL DESCRIPTION The NJM79 is a ground noise isolation amplifier designed for car audio system. It contains dual channel differential amplifier. It is developed for those car audio applications where long connections between head unit and other components are necessary and ground noise has to be eliminated. PACKAGE OUTLINE NJM79RB MSOP (TVSP) NJM79V (SSOP) FEATURES Dual Channel Differential Amplifier Operating Voltage Operating Current Common mode rejection ratio Maximum Output Voltage Supply Voltage Rejection Ratio Total Harmonic Distortion Noise Output Voltage Bipolar Technology Package Outline BLOCK DIAGRAM. to V ma typ. CMRR=dB typ. Vrms min., @ THD=.% db typ..% typ..µvrms typ. MSOP (TVSP)* SSOP *MEET JEDEC MO-87-DA / THIN TYPE V IN OUT IN IN- IN- OUT GND
PIN CONFIGURATION MSOP(TVSP) No. Symbol Function OUT Output GND Ground Reference Voltage V Power Supply OUT Output IN Input 7 IN- -Input 8 No Connect 9 IN- -Input IN Input SSOP 7 8 No. Symbol Function OUT Output No Connect GND Ground Reference Voltage V Power Supply No Connect 7 OUT Output 8 IN Input 9 No Connect IN- -Input No Connect IN- -Input No Connect IN Input
ABSOLUTE MAXIMUM RANGES (Ta= C) PARAMETER SYMBOL RANGE UNIT Supply Voltage V V Maximum Input Voltage V IM to V ( ) V Power Dissipation P D MSOP(TVSP) : * SSOP : * NOTE: EIA/JEDEC STANDARD Test board (7.x.x.mm, layer, FR-) mounting mw Operating Temperature Topr - to 8 C Storage Temperature Tstg - to C ( ) For the maximum input voltage less than tov ELECTRICAL CHARACTERRISTIC (V =9V,Ta= C) PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT DC CHARACTERRISTIC Operating Voltage V. 9 V Operating Current I CC No Signal - ma Reference Voltage V REF.8..8 V AC CHARACTERRISTIC (Non-inverting circuit, f=khz, Vin=Vrms, R g =Ω, R L =kω unless otherwise specified) Voltage Gain Gv -... db Channel Separation CS f=khz 9 - db Channel Balance BAL - -. db Roll-off High Frequency f RH -db - - khz Input Resistance R IN 8 kω Output Resistance R OUT - 9 - Ω Maximum Output Voltage V OM THD=.%, f = khz. - Vrms Maximum Output Voltage V OM THD=.%, f = khz, V =8V.7. - Vrms Maximum Output Voltage Maximum Output Voltage V OM V OM Inverting, THD=.%, f = khz Inverting, THD=.%, f = khz, V =8V -. - Vrms -. - Vrms Noise Output Voltage V NO Rg=Ω, A-weighted -.. µvrms Total Harmonic Distortion Common Mode Rejection Ratio Common Mode Input Voltage Supply Voltage Rejection Ratio THD f=khz, V O =Vrms, BW=Hz to khz -.. % CMRR - db Vicm CMRR=dB - - Vrms SVR f=hz, V ripple =mvrms - db
TERMINAL DESCRIPTION TVSP PIN NO. SSOP SYMBOL FUTION EQUIVALENT CIRCUIT TERMINAL DC VOLTAGE V V 7 OUT OUT Output Output Ω FB V x.8 [V] 7 9 8 IN IN- IN- IN Input -Input -Input Input Ω kω V x.8 [V] V V V kω Ω Reference Voltage V x.8 [V] kω
APPLICATION CIRCUIT MSOP(TVSP) : NJM79RB OUT.μF OUT IN.μF IN GND IN- IN- 9.μF μf 8 V μf V IN- IN- 7.μF OUT.μF OUT IN.μF IN SSOP : NJM79V OUT.μF OUT IN.μF IN GND IN- IN-.μF μf V μf V IN- IN-.μF 9 OUT OUT.μF 7 8 IN.μF IN
APPLICATION BLOCK DIAGRAM () Non-inverting line input IN OUT NJM79 IC GND V N () Inverting line input IN- IN- OUT IN NJM79 IC GND V N () Non-inverting line output IN OUT NJM79 IC GND V N () Inverting line output IN- IN- OUT IN NJM79 IC GND V N
TYPICAL CHARACTERISTICS Operating Current vs. Ambient Temperature V=9V Operating Current vs. Operating Voltage Operationg Current [ma] Operating Current [ma] o C Ta=8 o C - o C - - 7 Ambient Temperature [ o C] 9 Operating Voltage [V] Reference Voltage vs. Ambient Temperature V=9V Reference Voltage vs. Operating Voltage Reference Voltage [V] 9 Reference Voltage [V] 9 Ta=8,,- o C - - 7 Ambient Temparature [ o C] 9 Operating Voltage [V] Noise Output Voltage vs. Ambient Temperature V=9V, Rg=Ω, A-Weighted Noise Output Voltage vs. Signal Source Resistance V=9V, Ta= o C, A-Weighted Noise Output Voltage [dbv] - - - -8 - - - - - 7 Ambient Temperature [ o C] Noise Output Voltage [dbv] - - - -8 - -.. Signal Source Resistance [kω] 7
TYPICAL CHARACTERISTICS Channel Separation vs. Ambient Temperature V=9V, Rg=Ω, Vin=Vrms, BW=Hz-kHz IN -> OUT Channel Separation vs. Frequency V=9V, Rg=Ω, Vin=Vrms, BW=Hz-kHz Channel Separation [db] - - - -8 - Channel Separation [db] - - - -8 - IN -> OUT - - - 7 Ambient Temperature [ o C] - IN -> OUT THDN vs. Output Voltage V=9V, f=khz, Non-Inverting Circuit THDN vs. Output Voltage V=9V, f=khz, Inverting Circuit.. THDN [%]. Ta=,8 o C THDN [%]. Ta=-,,8 o C Ta=- o C...... THDN vs. Output Voltage V=8V, f=khz, Non-Inverting Circuit THDN vs. Output Voltage V=8V, f=khz, Inverting Circuit.. THDN [%]. Ta=,8 o C THDN [%]. Ta=-,,8 o C Ta=- o C...... 8
TYPICAL CHARACTERISTICS THDN vs. Output Voltage V=9V, Ta= o C, Non-Inverting Circuit THDN vs. Output Voltage V=9V, Ta= o C, Inverting Circuit.. THDN [%]. f=hz, khz THDN [%]. f=hz, khz,khz f=khz...... THDN vs. Output Voltage V=9V, Vin=Vrms, BW=Hz-8kHz, Non-Inverting Circuit THDN vs. Output Voltage V=9V, Vin=Vrms, BW=Hz-8kHz, Inverting Circuit.. THDN [%]. Ta=-,,8 o C THDN [%]. Ta=-,,8 o C.. Maximum Output Voltage vs. Operating Voltage f=khz, THD=.%, Non-Inverting Circuit Maximum Output Voltage vs. Operating Voltage f=khz, THD=.%, Inverting Circuit Maximum Ta=-,,8 o C Maximum Ta=-,,8 o C 9 9 Operating Voltage [V] Operating Voltage [V] 9
TYPICAL CHARACTERISTICS Maximum Maximum Output Voltage vs. Load Resistance V=9V, f=khz, Ta= o C, BW= - khz THD=.% V=V 9V.V. Load Resistance [kω] Voltage Gain [db] Voltage Gain vs. Frequency V=9V, Vin=Vrms, Ta= o C 8 - Non-Inverting Circuit, Inverting Circuit - - -8 - Reference Voltage [V]..... Reference Voltage Turn-on behaviour V=9V, Ta= C ref =.7µF C ref =µf C ref =µf 7 8 9 time [sec] Supply Voltage Rejection Ratio [db] - Supply Voltage Rejection Ratio vs. Frequency V=9V, Vripple=mV, Rg=Ω, Ta= - - - - - - -7-8 -9 C ref =µf C ref =.7µF C ref =µf Supply Voltage Rejection Ratio [db] - - - - - - -7-8 -9 - Supply Voltage Rejection Ratio vs. Signal Source Resistance V=9V, Vrippple=mV, f=hz, Ta= o C. Signal Source Resistance [kω] Supply Voltage Rejection Ratio [db] Supply Voltage Rejection Ratio vs. Operating Voltage Vripple=mV, f=hz, Rg=Ω, Ta= o C - - - - - - -7-8 -9-9 Operating Voltage [V]
TYPICAL CHARACTERISTICS Common Mode Rejection Ratio vs. Frequency V=9V, Vin=Vrms Common Mode Rejection Ratio vs. Input Voltage V=9V, f=khz, Ta= o C, BW= - khz Common Mode Rejection Ratio [db] - - - - - - -7-8 -9 o C Ta=- o C Ta=8 o C Common Mode Rejection Ratio [db] - - - - - - -7-8 -9 Ta=- o C 8 o C o C - -... Input Voltage [Vrms] [CAUTION] The specifications on this databook are only given for information, without any guarantee as regards either mistakes or omissions. The application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights.