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LB1412 Datasheet(PDF) 4 Page - Sanyo Semicon Device |
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LB1412 Datasheet(HTML) 4 Page - Sanyo Semicon Device |
4 / 5 page Sample Application Circuit Note : Input signal of approximately 110 mVrms causes D8 (0 dB display) to light. Unit (resistance: Ω, capacitance: F) For sample application circuit: 1. The LB1412 consists of the following blocks. . Input amp 1 : Amplification of input signal, variable with external constants . Input amp 2 : Amplification of signal (fixed, double), detection of signal . Reference voltage : Reference voltage of comparator, constant-current drive of LED . Comparator : Comparison of input voltage . LED driver : LED drive, D1 to D7 : Constant-current drive . Peak hold circuit : Hold of highest-order point of high-order 5 points (D8 to D12) . Oscillator for peak hold reset : Peak hold circuit reset 2. Description of constants of each block 2-1 R3, R4 (R11, R12) The gain of amp 1 depends on R3, R4. Gain of amp 1 = R3/R4 times. The gain of amp 1 must not exceed 4 times (12 dB). R3+R4 6 100 kΩ (C4 = 4.7 µF) 2-2 C2, C3 (C5, C6) C3 is for coupling amp 1 with amp 2 and its value is 1 µF. C2 is for controlling the time to turn off LED. 2-3 R2 (R10) The current of LEDs connected to D1 to D7 depends on R2. The current is stabilized to be approximately 17 mA at R2 =3k Ω and approximately 11 mA at R2 = 4.7 kΩ. 2-4 R5 to R9 (R13 to R17) The current of LEDs connected to D8 to D12 depends on these resistors. D8 to D12 pins are collectors of Darlington transistors. ID8 to D12 = VCC –Vsat D8 to D12 –VFLED R5 to 9 6 VCC – 3.5 V R5 to 9 ID8 to D12 is approximately 4 mA at R5 to 9 = 2.2 kΩ R5 2.2 k R6 2.2 k R7 2.2 k R8 2.2 k R9 2.2 k LB1412 No.1218-4/5 |
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