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| Audio ICs LED level meter driver, 5-point, VU scale BA6154 The BA6154 is a driver IC for LED VU level meters in stereo equipment and other display applications. The IC displays the input level (range: *10dB to ) 6dB) on a 5-point, bar-type LED display. The BA6137 includes a rectifier amplifier allowing direct AC input, and has constant-current outputs, so it can directly drive the LEDs without variations in LED current due to supply voltage fluctuations. FApplications VU meters, signal meters, and other display devices. FFeatures 1) Rectifier amplifier allows either AC or DC input. 2) Rectifier amplifier has high gain (26dB), so operation at low input level is possible. 3) Constant-current outputs for constant LED current when the power supply voltage fluctuates. 4) Built-in reference voltage means that power supply voltage fluctuations do not effect the display. 5) Wide operating power supply voltage range (3.5V to 16V) for a wide range of applications. 6) Low PCB space requirements. Comes in a compact 9-pin SIP package and requires few external components. FAbsolute maximum ratings (Ta = 25_C) 637 Audio ICs FBlock diagram BA6154 FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 6.0V, and Vf = 1kHz) FMeasurement circuit 638 Audio ICs FApplication example BA6154 The response time (attack and release time) can be changed by varying the values of C1 and R1. C2 is a coupling capacitor, and the potentiometer VR varies the input level. Input a fixed voltage level and adjust the potentiometer so that the LED lights at 0dB. To reduce the LED current, connect a resistor either in parallel FExternal dimensions (Units: mm) (Fig. 3 (1)) or in series (Fig. 3 (2)) with the LED. If a resister is connected in series with the LED, the LED current will change if the supply voltage fluctuates. Note: If the power supply voltage exceeds 9V, insert a resistor in series with the LED current supply line, or connect a heat sink so that the maximum power dissipation Pd Max. is not exceeded (see Fig. 4). 639 |
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