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| Audio ICs Fluorescent display tube level meter driver, 12-point, VU scale, bar display BA6146 The BA6146 is a monolithic fluorescent-display tube driver IC. It can drive a 12-point VU-scale bar-level meter over an input range of *20dB to 8dB. The IC has a low-offset rectifier amplifier, and does not require offset adjustment. It also has built-in on / off muting function. FApplications Tape deck and amplifier VU meters. FFeatures 1) Built-in low-offset rectifier amplifier. No offset adjustment required. 2) Built-in power supply muting function. 3) The input rectifier amplifier can handle both AC and DC input. FBlock diagram 4) Wide operating power supply voltage range (operates from VCC = 7.5V). 5) Low current dissipation (4mA Typ.). 672 Audio ICs FAbsolute maximum ratings (Ta = 25_C) BA6146 FElectrical characteristics (unless otherwise noted, Ta = 25_C and VCC = 18V) FMeasurement circuit 673 Audio ICs FApplication example BA6146 FAttached components (1) Input bias resistor: R1 This resistor is the input impedance. If the value of the resistor is large, the DC bias voltage will be large, and the input offset will be large and influence the comparator level. The recommended value for this resistor is 10k. (2) Time constant setting components for fluorescent tube lighting: C2 and R2 C2 and R2 approximately determine the recovery time (TR) according to the following formula. FPCB artwork for the application example circuit TR = 2.3 C2 R2 The attack time is related to the discharge capacity of the IC and the size of C2. When C2 is 10F, the attack time is approximately 3ms, and when C2 is 22F, the attack time is approximately 7ms. If the value of R2 is significantly larger than 10k, the comparator level will shift at low levels. The recommended range is 10k to 25k. 674 Audio ICs FElectrical characteristics curves BA6146 FOperation notes The maximum output current (IOUT Max.) is approximately 2mA. FExternal dimensions (Units: mm) 675 |
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