Optical disc ICs Pulse width controller for portable CD players BA3890F The BA3890F is an interface IC that provides gain for the PWM signal pulses used in digital servo systems, and allows gain adjustment to eliminate the dependence on battery voltage. FApplications Portable CD players CD-ROM, and MD players FFeatures 1) Amplifies the pulse width in accordance with the battery voltage. 2) Gain switching is possible via the control pin. FAbsolute maximum ratings (Ta = 25_C) FRecommended operating conditions 649 Optical disc ICs FBlock deagram FElectrical characteristics (Unless otherwise noted, Ta = 25_C and VCC = 3.0V) 650 BA3890F Optical disc ICs BA3890F Measurement circuit Application example 651 Optical disc ICs Electrical characteristic curves External dimensions (Units: mm) 652 BA3890F