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| Audio ICs LED level meter driver, 5-point, VU scale BA6137 The BA6137 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 power supply voltage fluctuations. FApplications VU meters, signal meters, and other display devices. FFeatures 1) Rectifier amplifier allows either AC or DC input. 2) Constant-current outputs for constant LED current when the power supply voltage fluctuates. 3) Current output is optimized for red LEDs, for low power dissipation. 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 attached components. FAbsolute maximum ratings (Ta = 25_C) FBlock diagram 738 Audio ICs FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 6.0V, and f = 1kHz) BA6137 FMeasurement circuit 739 Audio ICs FApplication example BA6137 The response time (attack and release time) can be changed by varying the values of C1 and R1 to change the time constant. C2 is a coupling capacitor, and VR varies the input level. Input the desired fixed voltage and adjust VR so that the LED lights at 0dB. To reduce the LED current, connect a resistor either in FExternal dimensions (Units: mm) parallel (Fig. 3 (1)) or in series (Fig. 3 (2)) with the LED. If a resistor 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). 740 |
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