NJM D Surround Audio Processor with Dynamic Bass Boost

Transcription

1 3D Surround Audio Processor with Dynamic Bass Boost GENEA DESCIPTION The NJM276 is the 3D surround audio processor with dynamic bass boost, regenerates rich sound field with only small two speakers. The NJM276 performs NJC original surround technology realizing natural surround sound field regarded center orientation and NJC original dynamic bass boost technology provides graceful bass sound with low distortion. It is suitable for minicomponent, CD radiocassette, TV, speaker system and others. PACKAGE OUTINE NJM276VE FEATUES Operating Voltage +4.7V to +3.V Wide Dynamic ange 3.Vrms typ. ow Output Noise 8.9µVrms typ. "" 3D Surround Function (Stereo only) Dynamic Bass Boost Function High Frequency Compensation (f=khz, GV=+3dB) Variable Surround Effect by external resistor Internal Mode Control Switch Bipolar Technology Package Outline SSOP24E BOCK DIAGAM HP H SW Vref K K K 3D FITE H SW SW H: :BYPASS PF VC H SW SW H:_Bass :BYPASS K HP H SW

2 PIN CONFIGUATION PF MIN 4. VEFOUT 3. MOUT. VEFIN 4. Ca 6. SW. Cr 7. SW2 6. BASSFI 8. FI 7. BASSFI2 9. HFFI 8. BASSVIN 2. HFFI 9. BASSVOUT 2. OUT. VIN 22. OUT. VOUT 23. IN 2. GND 24. IN 2

3 ABSOUTE MAXIMUM ATING (Ta=2 C) PAAMETE SYMBO ATINGS UNIT Supply Voltage V + V Power Dissipation P D (SSOP24) 6 mw Operating Temperature ange T opr 4 to +8 C Storage Temperature ange T stg 4 to +2 C OPEATING VOTAGE PAAMETE SYMBO TEST CONDITION MIN TYP MAX UNIT Operating Voltage V V EECTICA CHAACTEISTICS (Ta=2 C, =2V unless otherwise specified) TEST CONDITION PAAMETE SYMBO INPUT OUT Bass MIN TYP MAX UNIT MODE PUT V V Operating Current I CC Bypass No Signal ma Bass MAX eference Voltage Vref No Signal V AC CHAACTEISTICS (Ta=2 C, V + =2V, =2dBV(mVrms) unless otherwise specified) TEST CONDITION PAAMETE SYMBO INPUT OUT PUT MODE V Bass V MIN TYP MAX UNIT Maximum Input Voltage V IM f=khz THD=3% Bypass. (3.2) 2. (4.) f=hz THD=3% * Bass MAX 6. (2.) f=khz THD=3% MAX 7.9 (2.) dbv (Vrms) f=khz THD=3% Bass MAX MAX 7.8 (2.) 9.8 (3.) f=hz THD=3% Bass MAX MAX 3.4 (.).4 (.9) Output Noise V NO g=ω AWeighted Bypass (3) () g=ω AWeighted Bass MAX 98 (3) dbv g=ω AWeighted MAX () (µvrms) g=ω AWeighted Bass MAX MAX 97 (4) 92 (2) Total Harmonic Distortion THD f=khz Bypass.. f=hz f=khz V IIN Bass MAX. MAX. % f=khz Bass MAX MAX.. *:BASSV2OUT 3

4 AC CHAACTEISTICS (Ta=2 C, V + =2V, =2dBV(mVrms) unless otherwise specified) TEST CONDITION PAAMETE SYMBO INPUT OUT PUT MODE V Bass V MIN TYP MAX UNIT Bypass Gain G VBYP f=khz Bypass... db Gain G f=hz Bass MAX f=hz Bass MIN f=khz f=khz MAX MIN db f=hz Bass MAX MAX f=khz Bass MAX MAX CONTO CHAACTEISTICS (Ta=2 C, V + =2V, unless otherwise specified) PAAMETE SYMBO TEST CONDITION MIN TYP MAX UNIT MODE Select Control Voltage V MODE =High evel 2. V + V =ow evel..7 SWITCH FUNCTION MODE SW2 SW NOTES Bypass Input Through H 3D Surround mode Bass H Bass Enhanced mode Bass H H 3D Surround and Bass Enhanced mode 4

5 !TEMINA DESCIPTION No. SYMBO FUNCTION EQUIVAENT CICUIT VOTAGE PF Capacitor terminal for PF /2 6k 2 MIN Monaural Amplifier Input /2 2k 6k k 3 MOUT Monaural Amplifier Output /2 4 Ca Cr Capacitor Terminal for Attack Time Constant Capacitor Terminal for elease Time Constant k V VCA 6 BASSFI BASS Filter Terminal V k 82k

6 !TEMINA DESCIPTION No. SYMBO FUNCTION EQUIVAENT CICUIT VOTAGE BASSFI2 OUT OUT BASS Filter Terminal 2 ch Output ch Output /2 8 BASSVIN BASS Effect Adjust Terminal /2 9 BASSVOUT BASS Effect Adjust Terminal 2k /2 VIN Effect Adjust Terminal 2k /2 VOUT Effect Adjust Terminal /2 2k k 6

7 !TEMINA DESCIPTION No. SYMBO FUNCTION EQUIVAENT CICUIT VOTAGE 2 GND GND Terminal V 3 Power Supply Terminal 4 VEFOUT eference Voltage Output /2 4 VEFIN eference Voltage Input /2 k k SW SW2 Mode Switch Mode Switch 2 V k 7

8 !TEMINA DESCIPTION No. SYMBO FUNCTION EQUIVAENT CICUIT VOTAGE 8 FI Filter Terminal /2 32k k 9 2 HFFI HFFI High Frequency Filter for ch High Frequency Filter for ch k 4 / IN IN ch Input ch Input /2 k VEF 8

9 APPICATION CICUIT ch Input ch Input ch Output ch Output C 6pF C 6pF C6 µf C µf C3 µf C2 µf 6 3K 3K.47 µf 4 BassSW K SW 3 C9 C8 µf C7 K µf C6 µf C µf 2V C7 4 3 PF IN MIN IN µf MOUT OUT Ca OUT Cr HFFI BASSFI HFFI BASSFI2 FI BASSVIN C SW2 BASSVOUT SW VIN VEFIN VOUT VEFOUT GND µF 2K C2 µf C3 µf C4.8µF 2 2K Min Max 2KB Min Max 2KB BassV V 9

10 APPICATION NOTE. FineTuning the BASS The NJM276 has quite sophisticated NJC s original dynamic bassboost technology. Both of the level and the frequency for bassboost moves automatically corresponding to the input signal level. This dynamic filtering action prevents the signals over boosted, and provides less distortion and wide dynamic range bassboost processing. In addition, if you want to finetune the bassboost effect for your system, you can modify the bassboost effect by changing the external parts value as described below.. Modify the Boost Center Frequency This plot shows the frequency response for NJM276 BASS. Frequency Characteristics ( Bass) =2V Vin=2dBVch Vout=ch =4.7k Ω g=2ω C4=.µF C4=.µF Gain [db] C4=.8µF 4 Frequency [Hz] The Boost Center Frequency can be adjusted by changing the value for the external capacitor, C4. If your speaker system has more than Hz of f (= ower Frequency esponse ange), or, if you would like to get more powerful bassboost effect than the typical settings shown on the page 9, increasing the Boost Center Frequency higher could be a good idea. We strongly recommend you to determine the actual capacitance value by testing and examinations on your actual application. 2. Modification for the PF Cutoff Frequency f C This picture shows the equivalent circuit for NJM276 s PF. ch ch 2k 2k 2k 2pin 3pin 6k PF MONO Amp. C.µ pin The PF Cutoff Frequency f C is given by the following equation: f C = 2πC = 2πC 6k Set the f C as same as the Boost Center Frequency, which is determined as above (The Boost Center Frequency = the frequency of which the gain is +3dB). In the typical application circuit shown on the page 9, the PF Cutoff Frequency f C is set to Hz.

11 EFEENCE VAUE Speaker Size arge(f=hz) *) Medium(f=Hz) Small(f=2Hz) C[µF] C4[µF].8.. *) default value 3. Adjusting the Summing evel for BASS effect to / Output Signal Changing the resistance value connected between the terminal 8 and 9 can modify the Summing evel for the BASS effect to the / Output Signal. 2. Adjusting the High Frequency Compensation Filter The NJM276 has High Frequency Compensation Filter, which can produce well balance between boosted bass frequency range and treble frequency range. This picture shows the equivalent circuit for the High Frequency Compensation Filter. k 2pin HFFI 6 3k C 6p The Cutoff Frequency f CH and the Voltage Gain G VH are defined as below: f CH = 2πC = 2π C 6 G VH = 2log 6+k 6 In the typical application circuit shown on the page 9, the High Frequency Compensation Filter Cutoff Frequency f CH is set to khz and Voltage Gain G VH is set to 3.dB.

12 3. FineTuning (surround) Changing the external parts value modifies the surround effect as described below. 3.Adjust the Cutoff frequency Plot below Shows Voltage gain vs. Frequency. effect depends on C9 value. Changing C9 value controls filter cutoff frequency f C.. Initial fcl is khz. After trial listening, decide appropriate C9 value. Surround frequency becomes higher by smaller value. 電圧利得 Gain vs. 対 Frequency 周波数特性 =2V,Vin=dB,Vout=ch,Ta=2 =2V,Vin=dBV,Vout=ch,Ta=2 o C 4 ch ch 2k 2k 2k 2k 32k C9.47µ PF FIpin 2 8 Gain [db] 6 電圧利得 [db] C9=. 82µF C9=. 47µF C9=. 27µF f C(Cutoff Frequency) = 2πC PF circuit = 2πC 32k 4 2 周波数 [Hz] Frequency [Hz] 32Adjust gain Surround V value (pin) controls gain. Typical value is 2kΩ. Surround effect becomes stronger by larger value. Gain [db] Gain vs Frequency =2V, Vin=dBV, Vout=ch Output, Ta=2 C Surround V=kΩ Surround V=2kΩ Surround V=kΩ Surround V=kΩ Surround V=Ω Frequency [Hz] 2

13 TYPICA CHAACTEISTICS Supply Current vs. Supply Voltage =3V, Ta=2 o C Supply Current vs. Temperature =2V 2 6 BASS BASS Bypass Supply Current [ma] BASS Bypass Supply Current [ma] Supply Voltage [V] Temperature [ o C] Maximum Input Voltage vs. Supply Voltage (Bypass) Vin=ch, Vout=ch, f=khz, =4.7k Ω, g=2ω, Ta=2 o C 2 Maximum Input Voltage vs. Supply Voltage (BASS) Vin=ch+ch, Vout=BASSVOUT, f=hz, =4.7k Ω, g=2ω, Ta=2 o C 2 Maxmum Input Voltage [dbv] Maximum Input Voltage [dbv] Supply Voltage [V] Supply Voltagte [V] Maximum Input Voltage vs. Supply Voltage () Vin=ch, Vout=ch, f=khz, =4.7k Ω, g=2ω, Ta=2 o C Maximum Input Voltage ( BASS) Vin=ch, Vout=ch, f=khz, =4.7k Ω, g=2ω, Ta=2 o C Maximum Input Voltage [dbv] Maximum Input Voltage [dbv] Supply Voltage [V] Supply Voltage [V] 3

14 TYPICA CHAACTEISTICS Maximum Input Voltage vs. Supply Voltage ( BASS) Vin=ch+ch, Vout=ch, f=hz, =4.7k Ω, g=2ω Ta=2 o C 9 Output Noise vs. Temperature =2V, Vin=GND, Vout=ch 9 BASS BASS Maximum Input Voltage [dbv] Output Noise [dbv] Bypass Supply Voltage [V] 2 Temperature [ o C] THD+N vs. Input Voltage (Bypass) =2V, Vin=ch, Vout=ch, f=hz, =4.7k Ω, g=2ω, BW=8kHz THD+N vs. Input Voltage (Bypass) =2V, Vin=ch, Vout=ch, f=khz, =4.7k Ω, g=2ω, BW=8KHz Ta=8 o C Ta=8 o C THD+N [%].. Ta=2 o C Ta=4 o C THD+N [%].. Ta=2 o C Ta=4 o C Input Voltage [dbv] Input Voltage [dbv] THD+N vs. Input Voltage (Bypass) =2V, Vin=ch, Vout=ch, f=khz, =4.7k Ω, g=2ω, BW=8kHz THD+N vs. Input Voltage () =2V, Vin=ch, Vout=ch, f=khz, =4.7k Ω, g=2ω, BW=8kHz Ta=4 o C THD+N [%]. Ta=8 o C Ta=2 o C THD+N [%] Ta=2 o C Ta=8 o C Ta=4 o C Input Voltage [dbv] Input Voltage [dbv] 4

15 TYPICA CHAACTEISTICS THD+N vs. Input Voltage ( BASS) =2V, Vin=ch, Vout=ch, f=hz, =4.7k Ω, g=2ω, BW=8kHz THD+N vs. Input Voltage ( BASS) =2V, Vin=ch, Vout=ch, f=khz, =4.7k Ω, g=2ω, BW=8kHz THD+N [%]. Ta=8 o C Ta=2 o C Ta=4 o C THD+N [%]. Ta=4 o C Ta=2 o C Ta=8 o C Input Voltage [dbv] Input Voltage [dbv] THD+N vs. Input Voltage ( BASS) =2V, Vin=ch, Vout=ch, f=2khz, =4.7k Ω, g=2ω, BW=8kHz 3 Gain vs. Frequency (Bypass) =2V, Vin=2dBV ch, Vout=ch, =4.7k Ω, g=2ω 2 Ta=8 o C Ta=2 o C Ta=4 o C THD+N [%] Ta=4 o C Ta=2 o C Gain [db]. Ta=8 o C Input Voltage [dbv] 3 4 Frequency [Hz] 2 Gain vs. Frequency (BASS) =2V, Vin=2dBV ch+ch, Vout=ch, =4.7k Ω, g=2ω 2 Gain vs. Frequency () =2V, Vin=2dBV ch, Vout=ch, =4.7k Ω, g=2ω 8 Ta=8 o C 8 Ta=8 o C Gain [db] 6 4 Ta=2 o C Ta=4 o C Gain [db] 6 4 Ta=2 o C Ta=4 o C Frequency [Hz] 2 4 Frequency [Hz]

16 TYPICA CHAACTEISTICS 2 Gain vs. Frequency ( BASS) =2V, Vin=2dBV ch, Vout=ch, =4.7k Ω, g=2ω 2 Gain vs. Frequency ( BASS) Ta=8 o C 8 Ta=2 o C 4dBPUT Gain [db] 6 4 Ta=4 o C Gain [db] 3dBPUT 2dBPUT dbput dbput Frequency [Hz] 4 Frequency [Hz] [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. 6

17 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & ifecycle Information: NJ: NJM276 NJM276VETE2 NJM276E2TE