Datasheet 80-mW Coupling Capacitorless Stereo Headphone Amplifiers BD88400FJ General Description Package W(Typ) x D(Typ) x H(Max) BD88400FJ is an output coupling capacitorless headphone amplifier. This IC has a built-in regulated negative voltage generator type that generates the direct regulated negative voltage from the supply voltage. It is possible to drive headphones in a ground standard with both voltage of the positive voltage (+2.4V) and the negative voltage (-2.4V). Therefore a large capacitance output coupling capacitor becomes needless and can reduce cost, board area and height of the part. In addition, there is no signal degradation at the low range caused by the output coupling capacitor and output load impedance, thus a rich low tone can be outputted. SOP-J14 8.65mm x 6.00mm x 1.65mm Features No Bulky DC-Blocking Capacitors Required No Degradation of Low-Frequency Response Due to Output Capacitors Ground- Referenced Outputs Gain setting: Vari able Gain with External Resistors Low THD+N Low Supply Current Integrated Negative Power Supply Integrated Short-Circuit and Thermal-Overload Protection Applications Home Audio, TVs, Portable Audio Players, PCs, Digital Cameras, Electronic Dictionaries, Voice Recorders, Bluetooth Headsets, etc. Key Specifications and Lineup Supply Voltage V +2.4 to +5.5 Supply Current mA 2.0 (No Signal) Gain V/V Variable Gain with External Resistor 80 Maximum Output Power mW (V =3.3V,R =16, THD+N1%,f=1kHz) DD L 0.006 THD+N % (V =3.3V,R =16,Po=10mW,f=1kHz) DD L Noise Voltage Vrms 10 -80 PSRR dB (f=217Hz) Product structureSilicon monolithic integrated circuit This product has no designed protection against radioactive rays . www.rohm.com TSZ02201-0C1C0EA00160-1-2 2014 ROHM Co., Ltd. All rights reserved. 1/27 TSZ2211114001 07.Aug.2014 Rev.002DatasheetDatasheet BD88400FJ Typical Application Circuit SHUTDOWN Lch Input Control Cil 1.0F Ri 10k Rf 10k 3.3V 1 4 14 SVDD SVDD 12 3.3V Csvdd 1.0F PVDD 5 SVDD Part Function Value Remarks 14k Cpvdd OUTL - 1.0F 11 Flying Temp. Characteristic C1P + CF 2.2F 6 Capacitor Class-B SVSS SVDD SGND SHDNRB Hold Temp. Characteristic PGND CH 2.2F SVDD CF CHARGE UVLO/ Capacitor 7 SHORT PUMP Class-B 2.2F SHUTDOWN TSD PROTECTION CONTROL CH Bypass Temp. Characteristic 2.2F CPVDD 1.0F C1N SGND Capacitor PVDD SVDD 8 SVSS Class-B CHARGE OUTR + CLOCK PUMP Bypass Temp. Characteristic GENERATOR 13 CONTROL 14k CSVDD 1.0F PVSS - Capacitor 9 Class-B SVDD Coupling Temp. Characteristic SVSS Cil 1.0F SVSS Capacitor SGND 10 Class-B 3 2 Coupling Temp. Characteristic Rf Cir 1.0F Ri 10k Capacitor 10k Class-B Cir Input MCR006YZPJ103 1.0F Ri 10k Resistor (ROHM) Rch Input Feedback MCR006YZPJ103 Rf 10k Resistor (ROHM) In BD88400FJ, the Pass Gain follows formula (4). The Pass Gain and the resistor Rf is limited by table.1. R f Gain = (4) R i Table 1. Pass Gain and Resistor Limit Item Min Typ Max Unit Pass Gain 0.5 1.0 2.0 V/V Rf 1.0 10 - k Ri - 10 - k Ri is not limited. But, if this resistor Ri is very small, the signal degradation happens at the low frequency (Refer to formula (2)). www.rohm.com TSZ02201-0C1C0EA00160-1-2 2014 ROHM Co., Ltd. All rights reserved. 2/27 TSZ2211115001 07.Aug.2014 Rev.002 SGND SHDNRB SHDNLB INR INL