BA6800AS

Audio ICs Fluorescent display tube level meter driver, 16-point 2 channel, VU scale, bar display BA6800AS The BA6800AS is a two-channel, 16-point fluorescent display tube driver for VU-scale bar-level meters. It uses a dynamic-drive system and has both AC and DC inputs. The AC input mode has a peak hold circuit. The IC features a power-on mute, and the output block can directly drive fluorescent display tubes, so few external components are required. The grid output duty cycle is 1 / 8. FApplications Level meters for all types of AV equipment FFeatures 1) Uses dynamic-drive system to display two 16-point channels. 30-pin SDIP package. 2) AC and DC inputs provided. Switching function allows two-mode display. 3) Upper 12 points have peak hold function in AC mode (two seconds). FAbsolute maximum ratings (Ta = 25_C) 4) Power-on mute function. 5) Dynamic-drive system reduces the power dissipation of the fluorescent display tube power supply. 6) Square root compression amplifier built in. 797 Audio ICs FElectrical characteristics (unless otherwise noted, Ta = 25_C) BA6800AS FBlock diagram 798 Audio ICs FElectrical characteristics (unless otherwise noted, Ta = 25_C) BA6800AS 799 Audio ICs FMeasurement circuit BA6800AS FApplication example 800 Audio ICs FCircuit operation (1) Input block The AC input pins are pins 1 and 3, and the DC input pins are pins 6 and 7. Pin 8 is used to switch between the AC and DC inputs. When the input to pin 8 is “H”, AC input is selected (...