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 Product Designation Page 1 of 2 ROHM-logo Product Designation l l l When ordering, specify the part number. Check each code against the tables shown below. Fill in from the left, leaving any extra boxes empty on the right. Product Designation Ordering information Packing and forming information only required for SOP, and QFP parts that are required in tape and reel containers. For example, to order part BA4558F on paper tape type E2, order number is BA4558F-E2, when required in tube container, order number is BA4558F. Quick reference of packaging specifications Package Container type DIP/SDIP Tube container SIP/HSIP/ZIP/SZIP/RSIP-A3 Tube container SOP/SSOP/HSOP/WSOP-10/WSOPL10 Packaging specification code Tube container Embossed E1, E2 tape file://F:\export\projects\bitting1\imaging\BITTING\cpl\20010105\01042001\ROHM...\7form.htm 1/5/01 Product Designation SSOP-A54 Page 2 of 2 Embossed E2 tape Tray Tray (dry QFP/SQFP/VQFP/UQFP/TQFP/PBGA pack) VP Embossed E1, E2 tape Bulk TO220FP Tube container SMP5 Embossed TL, TR tape TO252 Embossed E1, E2 tape RSLP8 Embossed E2(Sprocket 1pin, tape Horizontal) RSIP13 E2(Sprocket 1pin, Embossed Horizontal), E4 tape (Sprocket 1pin, Vertical) Note: SOP type can be delivered in tube, paper tape, or embossed tape. BGA/CSP package | SIP/ZIP package QFP package | Photo package SOP package | Product Designation DIP package | Packaging Specification [LSI Package Assemblies] [HOME | Selection Guide] file://F:\export\projects\bitting1\imaging\BITTING\cpl\20010105\01042001\ROHM...\7form.htm 1/5/01