Audio ICs Low power consumption headphone driver for digital audio BA3577FS The BA3577FS is a headphone driver developed for portable digital audio equipment that supports a voltage of 1.5V. Applications Portable MD players and others Features 1) 1.5V supported. 2) Low current consumption (At PO = 0.5mW / ch, VCC inflow current = 3.3mA, and B inflow current = 6.8mA (Typ.)). 3) Output coupling capacitor of 100F produces fC = 45Hz (RL = 16). Absolute maximum ratings (Ta = 25C) Recommended operating conditions (Ta = 25C) 818 4) Internal muting switch. 5) Internal ripple filter. 6) Internal BEEP circuit. Audio ICs BA3577FS Block diagram 819 Audio ICs Pin descriptions 820 BA3577FS Audio ICs BA3577FS 821 Audio ICs BA3577FS Electrical characteristics (unless otherwise noted, Ta = 25C, VCC = 2.8V, B = 1.2V, PWSTB = 2.8V, MUTE = 0V, RL = 16, f = 1kHz, DIN AUDIO) 822 Audio ICs BA3577FS Measurement circuit 823 Audio ICs Measurement conditions 824 BA3577FS Audio ICs BA3577FS Circuit operation (1) The BA3577FS operates at the timing chart shown below, which prevents popping noises in the headphone output. (2) The ripple filters (pins 1 and 2) and bias amplifiers (pins 3 and 4) of the BA3577FS cannot be used as external power supplies or reference voltages. (3) The BA3577FS outputs a BEEP signal only when the PWSTB pin (pin 7) and the MUTE pin (pin 9) are HIGH. Also, input a rectangular waveform of 500Hz to 5kHz with an amplitude from the GND to VCC to the BEEP IN pin (pin 11). 825 Audio ICs Application example Electrical characteristic curves 826 BA3577FS Audio ICs BA3577FS External dimensions (Units: mm) 827 Appendix Notes No technical content pages of this document may be reproduced in any form or transmitted by any means without prior permission of ROHM CO.,LTD. The contents described herein are subject to change without notice. The specifications for the product described in this document are for reference only. Upon actual use, therefore, please request that specifications to be separately delivered. Application circuit diagrams and circuit constants contained herein are shown as examples of standard use and operation. Please pay careful attention to the peripheral conditions when designing circuits and deciding upon circuit constants in the set. Any data, including, but not limited to application circuit diagrams information, described herein are intended only as illustrations of such devices and not as the specifications for such devices. ROHM CO.,LTD. disclaims any warranty that any use of such devices shall be free from infringement of any third party's intellectual property rights or other proprietary rights, and further, assumes no liability of whatsoever nature in the event of any such infringement, or arising from or connected with or related to the use of such devices. Upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or otherwise dispose of the same, no express or implied right or license to practice or commercially exploit any intellectual property rights or other proprietary rights owned or controlled by ROHM CO., LTD. is granted to any such buyer. Products listed in this document use silicon as a basic material. Products listed in this document are no antiradiation design. The products listed in this document are designed to be used with ordinary electronic equipment or devices (such as audio visual equipment, office-automation equipment, communications devices, electrical appliances and electronic toys). Should you intend to use these products with equipment or devices which require an extremely high level of reliability and the malfunction of with would directly endanger human life (such as medical instruments, transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers and other safety devices), please be sure to consult with our sales representative in advance. About Export Control Order in Japan Products described herein are the objects of controlled goods in Annex 1 (Item 16) of Export Trade Control Order in Japan. In case of export from Japan, please confirm if it applies to "objective" criteria or an "informed" (by MITI clause) on the basis of "catch all controls for Non-Proliferation of Weapons of Mass Destruction. Appendix1-Rev1.0