NJU8790 Pushbutton Interface EVR with Class D Stereo Power Amplifier GENERAL DESCRIPTION The NJU8790 is a pushbutton interface electronic volume with class D stereo power amplifier. It includes input selector, electronic volume, and limiter. The NJU8790 can control the volume and the mode select without the micro-controller by the pushbutton interface. The NJU8790 is suitable for low power consumption and simple control application such as mobile audio player, active speaker and cradle speaker. FEATURES OOperating Voltage OLow operating current PACKAGE OUTLINE NJU8790V +2.7 to +5.5V 10mA typ. (Active mode) 1µA max. (Stand-by mode) 2.7W+2.7W (V+= 5V, 4ohm, BTL) OOutput power OOutput filter-less OPop-noise reduction circuit OShort-circuit protection circuit OSupply voltage monitoring circuit O2-Input 1-Output selector (Single-end / Differential) OPushbutton interface EVR 0 to -68dB, MUTE OActive filter, limiter OCMOS Technology OPackage Outline SSOP44 (11 x 7.6 x 1.15mm, 0.5mm pitch) BLOCK DIAGRAM V+ V+ V+ V+ Mid Max V+ V+ V+ Volume indicator Power indicator Pow Active filter Power Button TEST SWMODE PWSW SELOUTL VOLINL PWIND VOLIND2 VOLIND1 OUTL EQ1L EQ2L NJU8790 IREF VDD VREF GND VDDL VDDR UVLO IN1L OUTLP 2.7W(4ohm) 1.5W(8ohm) Stereo Class‐D Amp IN1G IN1R Input Selector IN2L Electric Volume Limiter OUTLN OUTRP +12dB typ. OUTRN IN2R VSS Short Protection SELSW TEST1 SELOUTR VOLINR VOLADJ ATTADJ V+ ATT UP EQ1R EQ2R INT SENSE VSSL VSSR Active filter Up Dn V+ NJU8790 Ver.6.1 E OUTR V+ Att Input1/Input2 DOWN Initial Vol adjuster ‐12, ‐16, ‐20, ‐24 dB V+ Att. Level adjuster ‐10, ‐15, ‐20, Mute -1- NJU8790 PIN CONFIGURATION 44 23 1 22 No. Symbol Function No. Symbol Function 1 IN1L Lch Input 1 23 VDD Power Supply 2 IN1G Common Input 1 24 VOLIND2 Volume Indicator 2 3 IN1R Rch Input 1 25 VOLIND1 Volume Indicator 1 4 IREF Reference Current 26 PWIND Power Indicator 5 SWMODE Control Mode Setting 27 TEST Test 6 ATT ATT Select Switch 28 VDDL Lch Output Power Supply 7 TEST1 Test 29 OUTLN Lch Inverted Output 8 SELOUTR Selector Output R 30 VSSL Lch Output GND 9 VOLINR Volume Input R 31 OUTLP Lch Non-inverted Output 10 OUTR Volume Output Rch 32 VDDL Lch Output Power Supply 11 EQ1R Active Filter1 Rch 33 EQ2L Active Filter2 Lch 12 EQ2R Active Filter2 Rch 34 EQ1L Active Filter1 Lch 13 VDDR Rch Output Power Supply 35 OUTL Volume Output L 14 OUTRP Rch Non-inverted Output 36 VOLINL Volume Input L 15 VSSR Rch Output GND 37 SELOUTL Selector Output L 16 OUTRN Rch Inverted Output 38 SENSE Limiter Sensitivity Setting 17 VDDR Rch Output Power Supply 39 INT Recovery Time Setting 18 SELSW Input Selector 40 ATTADJ Attenuator Adjustor 19 PWSW Power ON/OFF 41 VOLADJ Volume Initialization 20 UP Volume Up Button 42 IN2L Lch Input 2 21 DOWN Volume Down Button 43 VREF Reference voltage 22 VSS GND 44 IN2R Rch Input 2 *)The relations of ”VSS= VSSL= VSSR=0V” and “VDD= VDDL=VDDR” must be maintained. -2- NJU8790 ABSOLUTE MAXIMUM RATING (Ta=25°C) PARAMETER Power Supply Voltage Power Dissipation*1) SYMBOL RATING UNIT V +7 V PD2 1200 mW PD4 1700 mW + + 2) Maximum Input Voltage VIMAX 0 to V * V Operating Temperature Range Topr -40 to +85 °C Storage Temperature Range Tstg -40 to +125 °C Load Impedance RLMIN >3.6 Ω *1) Power Dissipation EIA/JEDEC STANDARD Test board (2layer or 4layer) mounting. The class-D amplifiers operate with high power efficiency and low dissipation power compared to general analog-amplifiers. In theory, the NJU8790 actualize quite high output-power such as 2.7W/channel at 5V operation into 4 ohms load, and total power is supposed to be 5.4W. For this reason, it looks as if the NJU8790 exceeds the absolute maximum rating of the power dissipation. However, in practice, the effective output-power of usual music sound is only about 1/5 to 1/10 of its maximum output power, thus it may never exceed the absolute maximum rating. *2) Don’t apply the input voltage that exceeds supply voltage. ELECTRICAL RECOMMENDED OPERATING CONDITION (Ta=25°C) PARAMETER Operating Voltage SYMBOL V TEST CONDITION + MIN. TYP. MAX. UNIT 2.7 5.0 5.5 V MIN. TYP. MAX. UNIT ELECTRICAL CHARACTERISTICS ♦DC CHARACTERISTICS1 (Ta=25°C, V+=5.0V, unless otherwise specified) PARAMETER Operating Current Reference Voltage UVLO Detecting Voltage SYMBOL TEST CONDITION IDD1 No Signal, Active - 10.0 15.0 mA IDD2 No Signal, Standby - 0.1 1.0 µA VREF No signal 1.47 1.67 1.87 V 2.0 2.2 2.4 V VDDDET -3- NJU8790 ♦DC CHARACTERISTICS2 (Ta=25°C, V+=5.0V, unless otherwise specified) PARAMETER Low Side Output Transistor Resistance High Side Output Transistor Resistance Input Resistance Class-D Amplifier Switching Frequency Class-D Amplifier Turn-On Time Class-D Amplifier Turn-Off Time High Output Voltage Low Output Voltage SYMBOL RDSL RDSH RIN MIN. TYP. MAX. UNIT - 0.4 - Ω - 0.4 - Ω - 100 - kΩ 245 320 395 kHz OUTLP=0.01V, OUTLN=0.01V OUTRP=0.01V, OUTRN=0.01V OUTLP=VDDL-0.01V, OUTLN=VDDL-0.01V OUTRP=VDDR-0.01V, OUTRN =VDDR-0.01V IN1L, IN1R, IN2L, IN2R FOSC TON PWSW :Toggle SW mode 180 244 300 ms TOFF PWSW :Toggle SW mode 180 244 300 ms VOH ISOURCE=1mA (pin 23,24,25) V+*0.8 - V+ V VOL High Input Voltage VIH Low Input Voltage VIL Pull-Down Resistance TEST CONDITION RPULLDWN ISINK=1mA (pin 23,24,25)) pin 5, pin 6, pin 7, pin 18, pin 19, pin 20,pin 21, pin 27 pin 5, pin 6, pin 7, pin 18, pin 19, pin 20,pin 21, pin 27 0 + - + V *0.8 + V V *0.8 - V V 0 - V+*0.2 V pin 19, pin 20,pin 21 - 100 - kΩ Mode Resistance range 1/4 RMODE1 pin 40, pin 41 0 - 20 kΩ Mode Resistance range 2/4 RMODE2 pin 40, pin 41 40 - 60 kΩ Mode Resistance range 3/4 RMODE3 pin 40, pin 41 90 - 110 kΩ Mode Resistance range 4/4 RMODE4 pin 40, pin 41 150 - ∞ kΩ Pulse Distinction Time TJDGPLS pin 19, pin 20,pin 21 15 20 25 ms Auto Increment Distinction Time TJDGINC pin 19, pin 20,pin 21 0.7 1 1.3 s TAINC pin 19, pin 20,pin 21 117 167 217 ms Auto Increment cycle -4- NJU8790 ♦AC CHARACTERISTICS1 + (Ta=25°C, V =5.0V, VIN=500mVrms, f=1kHz, BW=20Hz to 20kHz, RL=8Ω, VOL: 0dB, unless otherwise specified) Measurement pin: OUTR(pin10), OUTL(pin35) PARAMETER Maximum Input Voltage SYMBOL VIM TEST CONDITION VOL=-12dB THD=1% MIN. TYP. MAX. UNIT 1.5 1.7 - Vrms -1.0 0 1.0 dB Maximum Gain GVMAX Initial Volume 1 GVINIT1 RINIT= 0Ω -14 -12 -10 dB GVINIT2 RINIT= 47kΩ -18 -16 -14 dB Initial Volume 3 GVINIT3 RINIT= 100kΩ -22 -20 -18 dB Initial Volume 4 GVINIT4 RINIT= OPEN -26 -24 -22 dB Maximum Attenuate level GVOL-68 VOL= -68dB -70 -68 -66 dB Mute Level Mute VOL= Mute - -90 -84 dB ATT Level 1 GVATT1 RATT=0Ω -12.0 -10.0 -8.0 dB ATT Level 2 GVATT2 RATT=47kΩ -17.0 -15.0 -13.0 dB ATT Level 3 GVATT3 RATT=100kΩ -22.0 -20.0 -18.0 dB ATT Mute Level GVATT4 RATT=OPEN - -90 -84 dB Initial Volume 2 Channel Balance GCB Cross Talk CT Selected Input: No Signal, Rg=0Ω Channel Separation CS Rg=0Ω -1.0 0.0 1.0 dB 70 80 - dB 70 80 - dB ♦AC CHARACTERISTICS2 + (Ta=25°C, V =5.0V, VIN=500mVrms, f=1kHz, BW=20Hz to 20kHz, RL=8Ω, VOL: 0dB, unless otherwise specified) Measurement pin: OUTRP-OUTRN (PIN 14-PIN16), OUTLP-OUTLN (PIN 31-PIN29) PARAMETER Output Power Efficiency THD+N SYMBOL EEFF THD+N TEST CONDITION MIN. TYP. MAX. UNIT THD=10% - 85 - % PO=1W - 0.03 - % Output Power1 Po THD+N=10%, RL=8Ω - 1.5 - W/ch Output Power2 Po - 2.7 - W/ch Limit Level VLIM THD+N=10%, RL=4Ω VIN=0.7Vrms,RSENSE=56kΩ No-load No-load 1.5 2.0 2.5 Vrms - 12.0 - dB Power Amplifier Gain Av Output Noise Voltage 1 VNO1 Rg=0Ω, A-weighted - Output Noise Voltage 2 VNO2 Rg=0Ω, A-weighted VOL=-68dB - -80 (100) -80 (100) dBV - (µVrms) dBV - (µVrms) THD+N Measurement Circuit NJU8790 AUX‐0025 Evaluation Board LPF Filters 20kHz(AES17) THD METER Audio Analyzer -5- NJU8790 PIN DESCRIPTION ♦SWMODE (pin 5) and PWSW (pin 19) SWMODE (pin 5) L Momentary SW mode setting H Toggle SW mode setting PWSW(pin 19) FUNCTION L→H System status is changed to active mode and standby mode alternately. H→L No change. H Active mode L Standby Mode. Momentary SW mode data format High Mode Change [Active] Mode Change [Standby] Mode Change [Active] Low Toggle SW mode data format High Mode Change [Active] Mode Change [Standby] Mode Change [Active] Low ♦ATT (pin 6) Toggle SW Mode PIN CONDITION FUNCTION L Attenuator: OFF H Attenuator: ON . ♦SELSW (pin 18) Toggle SW Mode PIN CONDITION -6- FUNCTION L IN1R, IN1L signals are selected. H IN2R, IN2L signals are selected. NJU8790 ♦UP (pin 20) PIN CONDITION FUNCTION OPEN(L)→H Volume setting is increased 1 step. In the cace that “H” signal inputs more than Auto Increment Distinction Time, volume setting is increased continuously. H→OPEN(L) No change. * The “Toggle SW mode” does not support. ♦DOWN (pin 21) PIN CONDITION FUNCTION OPEN(L)→H Volume setting is decreased 1 step. In the cace that “H” signal inputs more than Auto Increment Distinction Time, volume setting is decreased continuously. H→OPEN(L) No change. * The “Toggle SW mode” does not support. ♦TEST (pin 27) PIN CONDITION FUNCTION L Normal operation mode H Test mode. Do not use for normal operation. ♦TEST1 (pin 7) PIN CONDITION FUNCTION L Normal operation mode H Test mode. Do not use for normal operation. ♦VOLADJ (pin 41) CONNECTED RESISTANCE FUNCTION 0Ω to 20kΩ Volume initial value: -12dB 40Ω to 60kΩ Volume initial value: -16dB 90kΩ to 110kΩ Volume initial value: -20dB 150kΩ to OPEN Volume initial value: -24dB ♦ATTADJ (pin 40) CONNECTED RESISTANCE FUNCTION 0Ω to 20kΩ Attenuator initial value: -10dB 40Ω to 60kΩ Attenuator initial value: -15dB 90kΩ to 110kΩ Attenuator initial value: -20dB 150kΩ to OPEN Mute -7- NJU8790 CONTROL DATA ♦INITIAL CONDITION (POWER ON) FUNCTION TERMINAL Power Pin 19 Volume Pin 20, Pin 21 CONDITION Standby -12dB, -16dB, -20dB, -24dB ♦Volume gain step setting Step No. Volume [dB] 0 MUTE 1 -68 2 -64 3 -60 4 -56 5 -52 6 -48 7 -45 8 -42 9 -39 10 -36 11 -34 12 -32 13 -30 14 -28 15 -26 16 -24(*) 17 -22 18 -20(*) 19 -18 20 -16(*) 21 -14 22 -12(*) 23 -10 24 -8 25 -6 26 -5 27 -4 28 -3 29 -2 30 -1 31 0 (*) -8- Initial Setting NJU8790 INDICATOR FUNCTION ♦PWIND (pin 26) CONDITION PIN VOLTAGE Class-D Amplifier Standby L Class-D Amplifier Active H ♦VOLIND1 (pin 25) CONDITION PIN VOLTAGE Volume setting is not 0dB L Volume setting is 0dB (Max.) H ♦VOLIND2 (pin 24) CONDITION PIN VOLTAGE Volume setting is –26dB or lower L Volume setting is –24dB or higher H -9- NJU8790 TIMING CHART ♦PWSW Momentary SW mode Standby release (Standby mode Æ Active mode) High PWSW (pin19) Low 20ms (Pulse Distinction Time) High PWIND (pin26) Low 244ms OUTR, OUTL (pin10, 35) 32ms + V /2 0V OUTRP OUTRN (pin14, 16) OUTLN, OUTLP (pin29, 31) V + 0V Standby (Active mode Æ Standby mode) PWSW (pin19) High Low 20ms (Pulse Distinction Time) High PWIND (pin26) Low 32ms + OUTR, OUTL (pin10, 35) V /2 0V + V OUTRP OUTRN (pin14, 16) OUTLN, OUTLP (pin29, 31) 0V - 10 - 244ms 32ms NJU8790 ♦PWSW Toggle SW mode Standby release (Standby mode Æ Active mode) High PWSW (pin19) Low 20ms (Pulse Distinction Time) High PWIND (pin26) Low 32ms OUTR, OUTL (pin10, 35) + V /2 0V OUTRP OUTRN (pin14, 16) OUTLN, OUTLP (pin29, 31) V + 0V 244ms (Class-D Amplifier Turn-On Time) Standby (Active mode Æ Standby mode) PWSW (pin19) High Low 20ms (Pulse Distinction Time) High PWIND (pin26) Low 32ms 32ms + OUTR, OUTL (pin10, 35) V /2 0V + V OUTRP OUTRN (pin14, 16) OUTLN, OUTLP (pin29, 31) 0V 244ms (Class-D Amplifier Turn-Off Time) - 11 - NJU8790 ♦Input Selector Input 1 Æ Input 2 High SELSW (pin18) Low 20ms OUTR(pin10) OUTL(pin35) + V /2 0V - 12 - 32ms 64ms 32ms NJU8790 Volume UP/DOWN control 1. Recognition condition of Volume UP/DOWN push button I/F 1-a.) The Volume UP/(DOWN) recognizes the data-command to the case that the DOWN(UP) button has not been pushed, besides that the UP(DOWN) button is pushed for the longer time than the “Pulse Distinction Time: 20ms". 1-b.) The Volume UP/(DOWN) recognizes the data-command to the case that the UP(DOWN) button has pushed earlier than the DOWN(UP) button, besides the UP(DOWN) button is pushed for the longer time than the “Pulse Distinction Time: 20ms". > Pulse Distinction Time (20ms typ.) Recognition > Pulse Distinction Time (20ms typ.) Recognition UP UP DOWN DOWN 1-a 1-b 2. Invalidity condition of Volume UP/DOWN push button I/F 2-a.) The Volume UP/(DOWN) does NOT recognize the data-command to the case that the UP(DOWN) button has pushed for the shorter time than the “Pulse Distinction Time: 20ms". (The Chattering prevention function operates.) 2-b.) The Volume UP/(DOWN) does NOT recognize the data-command to the case that the UP(DOWN) button has pushed for the shorter time than the “Pulse Distinction Time: 20ms" after released button. (The Chattering prevention function operates.) 2-c.) The Volume UP/(DOWN) does NOT recognize the data-command to the case that the UP(DOWN) button has pushed before releasing DOWN(UP) button. < Pulse Distinction Time (20ms typ.) < Pulse Distinction Time (20ms typ.) UP UP UP DOWN DOWN DOWN 2-a 2-b 2-c - 13 - NJU8790 3. Start condition of Volume UP/DOWN Auto increment function 3-a.) The Auto increment of volume UP(DOWN) is started to the case that the DOWN(UP) button has not been pushed, besides that the UP(DOWN) button is pushed for the longer time than the “Auto increment Distinction Time: 1s". > Auto increment Distinction Time (1s typ.) Auto increment starts UP DOWN OUTR(pin10) OUTL(pin35) Auto Increment cycle 3‐a 4. Stop condition of Volume UP/DOWN Auto increment function 4-a.) The Auto increment of volume UP(DOWN) is stopped to the case that the UP(DOWN) button has released for the longer time than the “Pulse Distinction Time: 20ms" for the Auto increment period. 4-b.) The Auto increment of volume UP(DOWN) is stopped to the case that the DOWN(UP) button has pushed for the Auto increment period. Auto increment Distinction Time (1s typ.) Increment start UP DOWN Auto increment Distinction Time (1s typ.) Increment start UP Increment stop 4-a - 14 - Pulse Distinction Time (20ms typ.) DOWN Increment stop 4-b NJU8790 APPLICATION CIRCUIT V+ V+ V+ V+ Mid Max V+ V+ C8=4.7μF R4=10kΩ Power indicator R11 Pow Power Button R15 Q1 R3=9.1kΩ R10 Volume indicator R13 Q3 R14 C7=0.1μF C18=0.1μF R2=100kΩ V+ C6=100pF Q2 C10=1μF R12 C17=4.7μF C16=0.1μF C4=4.7μF C5=0.47μF TEST SWMODE PWSW SELOUTL VOLINL PWIND VOLIND2 VOLIND1 OUTL EQ1L EQ2L NJU8790 C1=0.47μF C2=1μF C3=0.47μF SOUND IC C11=0.47μF C9=0.47μF IREF VDD VREF GND VDDL VDDR UVLO IN1L OUTLP IN1G 2.7W(4ohm) 1.5W(8ohm) Stereo Class‐D Amp IN1R Input Selector IN2L Electric Volume Limiter OUTLN OUTRP +12dB typ. OUTRN IN2R VSS Short Protection TEST1 SELSW SELOUTR VOLINR VOLADJ ATTADJ ATT UP DOWN OUTR EQ1R EQ2R INT SENSE VSSL VSSR C13=4.7μF C14 =0.47μF V+ R9=10kΩ V+ R6=0Ω to OPEN R8=9.1kΩ R5=0Ω to OPEN C15=100pF Att Up V+ C12=1μF R7=56kΩ Dn V+ Input1/Input2 [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. - 15 -