NJU8725 CLASS D AMPLIFIER FOR DIGITAL AUDIO GENERAL DESCRIPTION PACKAGE OUTLINE The NJU8725 is an 800mW-output class D th Amplifier featuring 6 modulation. It includes Digital Attenuator, Mute, and De-emphasis circuits. It converts digital source input to PWM signal output which is converted to analog signal with simple external LC low-pass filter. The NJU8725 realizes very high power-efficiency by class D operation. Therefore, it is suitable for battery-powered NJU8725V applications and others. FEATURES Stereo BTL Power Amplifier NJU8725KN1 Sixth-order 32f Over Sampling & PWM S Internal 8f Over Sampling Digital Filter S Sampling Frequency : 96kHz (Max.) De-Emphasis : 32kHz, 44.1kHz, 48kHz System Clock : 256f S Digital Processing : Attenuator 107step, LOG Curve : Mute Digital Audio Interface : 16bit, 18bit 2 : I S, LSB Justified, MSB Justified Short Circuit Protection Operating Voltage : 2.4 to 3.6V Driving Voltage : V to 5.25V DD C-MOS Technology Package Outline : SSOP24 / QFN28 PIN CONFIGURATION V 1 24 F0/DATA DD STBY 23 2 F1/REQ 28 TEST 3 22 F2/SCK 1 21 MUTE 4 DIN MUTE DIN V 5 DDL 20 V DDR V V DDL DDR OUT 6 OUT 19 LP RP OUT OUT LP RP V 7 V 18 SSL SSR V V SSL SSR 8 17 OUT V V OUT SSL SSR RN LN OUT OUT LN RN 9 V V 16 DDL DDR V V DDL DDR MODE LRCK10 15 RST 11 BCK 14 V 12 MCK 13 SS SSOP24 QFN28 Ver.2005-02-15 -1- MODE TEST RST STBY V V SS DD MCK F0/DATA BCK F1/REQ LRCK F2/SCK NC NC NJU8725 BLOCK DIAGRAM V DD Short Circuit Power On Protection Reset Circuit V SS V DDL Synchronization RST OUT LP Circuit V SSL MCK V DDL th 32f 6 S LRCK Serial 8f OUT S LN & Audio Data Over Sampling BCK PWM V SSL Interface Digital Filter DIN V DDR OUT MUTE RP STBY V SSR System MODE V DDR Control F0/DATA OUT F1/REQ RN F2/SCK V SSR Ver.2005-02-15 - 2 -
