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| NJU8710 PRELIMINARY 2V Operation Clock-less Switching Driver for Class D Amplifier GENERAL DESCRIPTION The NJU8710 is a 2V operation clock-less switching driver for a class D Amplifier with separated power supply between Input and Output. The NJU8710 provides powerful drivability in both of sink and source without flow-through current. Therefore, it can be used to the buffer or the switch as a driver IC. Furthermore it converts 1bit digital signal input, such as PWM or PDM signal, to analog signal output of the hi-fi audio level through a simple external LC low-pass filter. The NJU8710 realizes very high power-efficiency because of the class D operation and low voltage operation. Therefore, it is suitable for battery powered applications and others. PACKAGE OUTLINE NJU8710R FEATURES 2-channel 1bit Digital Signal Input Standby(Hi-Z) Control function Operating Voltage : 1.7V to 2.7V Driving Voltage : 1.7V to VDD CMOS Technology Package Outline : VSP10 PIN CONFIGURATION STBYB IN1 VSS OUTX1 VDDO 1 2 3 4 5 10 9 8 7 6 VDD IN2 VSS OUTX2 VDDO BLOCK DIAGRAM VDD VDDO VSS IN1 Dead Time Generator OUTX1 IN2 OUTX2 STBY VDDO VSS Ver.2004-06-02 -1- NJU8710 TERMINAL DESCRIPTION No. 10 5 6 3 8 2 9 4 7 SYMBOL VDD VDDO VSS IN1 IN2 OUTX1 OUTX2 I/O - - - I O Function Power Supply: VDD=2V Output Power Supply: VDDO=2V Power GND and Output GND terminal: VSS=0V 1-bit Data Input Terminal Output Terminal OUTX1 terminal outputs the inverted signal of IN1 terminal, OUTX2 terminal outputs the inverted signal of IN2 terminal. 1 STBYB I Standby Control Terminal (L:Standby) *VSS(Terminal No.3,8) should be connected at a nearest point to the IC. *VDDO(Terminal No.5,6) should be connected at a nearest point to the IC. *STBYB(Terminal No.1) must be connected to VDD, when this function is not used. INPUT TERMINAL STRUCTURE VDD Input Terminal VSS IC Circuit FUNCTIONAL DESCRIPTION (1) Signal Output (OUTX1, OUTX2 Terminal) Output signal becomes a inverted input signal. A flow-through current at the signal polarity transition doesn't generate by optimized dead time control circuit. Output signal is converted to analog signal via external 2nd-order or higher LC filter. A switching regulator with a high response against a voltage fluctuation is the best selection for the VDDO, which is the power supply for output drivers. To obtain better T.H.D. performance, the stabilization of the power is required. (2) Standby Control Function By setting the STBYB terminal to "L", the NJU8710 becomes standby condition. OUTX1 and OUTX2 are in Hi-Z. During standby condition, -2-2- Ver.2004-06-02 NJU8710 NJU3555 ABSOLUTE MAXIMUM RATINGS PARAMETER Supply Voltage Input Voltage Operating Temperature Storage Temperature Power Dissipation VSP10 Power Supply Voltage Condition SYMBOL VDD VDDO Vin Topr Tstg PD RATING -0.3 to +4.0 -0.3 to +2.7 -0.3 to VDD+0.3 -40 to +85 -40 to +125 450* VDD VDDO (Ta=25C) UNIT V V V C C mW V * : Mounted on two-layer board of based on the JEDEC. Note 1) All voltage values are specified as VSS=0V. Note 2) If the LSI is used on condition beyond the absolute maximum rating, the LSI may be destroyed. Using LSI within electrical characteristics is strongly recommended for normal operation. Use beyond the electrical characteristics conditions will cause malfunction and poor reliability. Note 3) De-coupling capacitors should be connected between VDD-VSS and VDDO-VSS due to the stabilized operation. ELECTRICAL CHARACTERISTICS PARAMETER VDD Supply Voltage VDDO Supply Voltage Output Driver High side Resistance Output Driver Low side Resistance Operating Current at Hi-Z Output Operating Current at no input signal SYMBOL VDD VDDO RH VOUT=VDDO-0.1V (Ta=25C, VDD=VDDO=2.0V, VSS=0.0V, unless otherwise noted) CONDITIONS MIN. TYP. MAX. UNIT 1.7 1.7 2.0 2.0 1.5 2.7 VDD 2 V V RL IST IDD IDDO VIH VOUT=0.1V IN1, IN2, STBYB="L" No-load operating, IN1=IN2=1.4MHz 0.7VDD 0 - 1.5 0.05 0.6 2 1 T.B.D T.B.D VDD A mA V V A Input Voltage VIL Input Leakage Current ILK 0.3VDD 1 Ver.2004-06-02 -3- NJU8710 TIMING CHARACTERISTICS * Signal Spread Characteristics IN1, IN2 0.7VDD 0.3VDD tPDL OUTX1, OUTX2 tPDH 0.7VDD 0.3VDD PARAMETER Maximum Operating Frequency Signal Spread Time (H L) Signal Spread Time (L H) SYMBOL fMax tPDL tPDH (Ta=25C, VDD=VDDO=2.0V, VSS=0.0V unless otherwise noted) CONDITIONS MIN. TYP. MAX. UNIT 25 20 20 MHz ns ns * Output Control Signal Input (STBYB) STBYB 0.7VDD 0.3VDD 0.7VDD 0.3VDD tUP tDN PARAMETER Rise Time Fall Time SYMBOL tUP tDN (Ta=25C, VDD=VDDO=2.0V, VSS=0.0V unless otherwise noted) CONDITIONS MIN. TYP. MAX. UNIT 50 50 ns ns -4-4- Ver.2004-06-02 NJU8710 NJU3555 APPLICATION CIRCUIT (Analog Signal Output) * Stereo OTL application example * A914BY-101M is manufactured by TOKO, INC. For further information, please refer to its technical papers. 220F A914BY-101M 0.22F 2 Audio Signal IN1 100H 1k OUTX1 4 32 Headphone 9 IN2 NJU8710 220F A914BY-101M 0.22F OUTX2 7 100H 0.1F Standby Control 1 STBYB VDDO VSS 5 0.1F 47F 3 0.1F Switching Regulator Logic Power 10F 0.1F 10 VDD VDDO VSS 6 8 * Monaural BTL application example * A914BY-101M is manufactured by TOKO, INC. For further information, please refer to its technical papers. A914BY-101M Audio Signal 2 100H 0.22F IN1 OUTX1 4 1k 32 Speaker 9 NJU8710 IN2 100H OUTX2 7 A914BY-101M Standby Control 1 STBYB VDDO VSS 0.1F 5 0.1F 47F 0.22F 3 0.1F Switching Regulator 10F 0.1F 10 Logic Power VDD VDDO VSS 6 8 Note 4) De-coupling capacitors must be connected between each power supply terminal and GND terminal. Note 5) The power supply for VDDO requires fast driving response performance such as a switching regulator for T.H.D.. Note 6) The bigger capacitor value of external AC-coupling capacitors realize better low frequency response characteristics. In addition, ESR(Equivalent Series Resistance) should be low. Note 7) The above circuit shows only application example and does not guarantee the any electrical characteristics. Therefore, please consider and check the circuit carefully to fit your application. Ver.2004-06-02 -5- NJU8710 [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. -6-6- Ver.2004-06-02 |
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