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 Ordering number: EN1593B
Monolithic Digital IC
LB1412M Level Meter for 12 LEDs
Functions and Features
Package Dimensions
unit : mm
. Bar-shaped display of input level by means of 12 LEDs. . High-order 5 dots with peak hold. . Built-in oscillator for peak hold reset. Requires 1pce each of . . . . .
external C, R. Uses either oscillator at the time of stereo operation. Also capable of resetting manually. Capable of constant-current driving low-order 7 dots (green LED). Constant-current value variable with an external resistor. Lower current drain available by connecting green LEDs in series. Built-in input amplifier. Requires no other light-up level adjustment than adjustment for 0 dB. D1 error: Within 3 dB of 20 dB Supply voltage range: 10 to 16 V
3045B-MFP24
[LB1412M]
SANYO : MFP24
Specifications
Absolute Maximum Ratings at Ta = 25C
Parameter Maximum supply voltage Output current Allowable power dissipation Operating temperature Storage temperature Symbol VCC max IOL Pd max Topr Tstg Pin 16 Pins 2 to 6: D8 to D12, output on Ta = 60C Conditions Ratings -0.3 to +18 30 380 -30 to +75 -40 to +125 Unit V mA mW C C
Allowable Operating Range at Ta = 25C
Parameter Supply voltage Symbol VCC Conditions Ratings 10 to 16 Unit V
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
53096HA(II)/9087KI/9134KI,TS No.1593-1/5
LB1412M
Electrical Characteristics at Ta = 25C, VCC = 12 V
Parameter Input bias current Output saturation voltage Voltage gain Input resistance Load resistance Output current Voltage gain Output current Amp (1) Amp (1) Amp (1) Amp (1) Amp (2) Amp (2) Amp (2) Amp (2) Symbol IBIN1 VOH01 VOL01 VGA1 RIN2 R02 IOL02 VGA2 IOL Vsat Vsat Output leak current Ioff Ioff D8 D1 D2 D3 D4 Comparator level D5 D6 D7 D9 D10 D11 D12 Reference voltage R pin flow-out current R pin voltage Oscillation frequency Current drain VTHD8 GD1 GD2 GD3 GD4 GD5 GD6 GD7 GD9 GD10 GD11 GD12 VZ IOLR VR fOSC ICC 17, 21 D1, D5: 3 k across VZ and ILED 18, 19, D2 to D4, D6 to D7: output 20, 22, transistor on across VZ and ILED 23 2 to 6 17, 21 2 to 6 2 17 18 19 20 21 22 23 3 4 5 6 13 12 12 14 16 D8 to D12: IOLD1 to D5 = 30 mA D1, D5: output transistor off D8 to D12: output transistor off D8: Voltage to turn on D8 by applying DC voltage across VZ and IN2 D8 light-up level: 0 dB D8 light-up level: 0 dB D8 light-up level: 0 dB D8 light-up level: 0 dB D8 light-up level: 0 dB D8 light-up level: 0 dB D8 light-up level: 0 dB D8 light-up level: 0 dB D8 light-up level: 0 dB D8 light-up level: 0 dB D8 light-up level: 0 dB 3 k across VZ and ILED VR = 0 V, OSC pin open OSC pin open 1 M, 2.2 F across VCC and VZ 3 k across VZ and ILED, all D outputs off 0 0 -0.625 -23 -17 -12 -8 -6 -4 -1.5 0.5 2 4 7 5.6 -0.6 0.4 1.5 -0.55 -20 -15 -10 -7 -5 -3 -1 1 3 5 8 6.3 -0.3 0.7 2 9 10 11 11 Pin No. 8 9 9 Pins 9, 10 short Pins 9, 10 short Conditions min -3 10.5 1.0 30 8 35 3 1.8 13 typ -0.2 11.2 1.5 100 12 50 6 2.0 17 1.0 1.5 16 65 12 2.2 20 1.3 2.0 30 30 -0.465 -17 -13 -8 -6 -4 -2 -0.5 1.5 4 6 9 6.8 -0.1 0.9 2.5 15 max 0 11.6 2.0 Unit A V V dB k k mA times mA V V A A V dB dB dB dB dB dB dB dB dB dB dB V mA V s mA
Output saturation voltage
Allowable power dissipation, Pd max - mW
Pd max - Ta
Ambient temperature, Ta - C
No.1593-2/5
LB1412M
Pin Assignment
Equivalent Circuit Block Diagram
Oscillator
Constantcurrent driver
Constantcurrent driver
VCC 10 to 16 V
Unit (resistance: , capacitance: F) No.1593-3/5
LB1412M
Sample Application Circuit
R5 2.2 k R6 2.2 k R7 2.2 k R8 2.2 k R9 2.2 k
Unit (resistance: , capacitance: F) Note : Input signal of approximately 110 mVrms causes D8 (0 dB display) to light. For sample application circuit : 1. The LB1412M 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
10 to 16 V
. . . . . . .
2.
Description of constants of each block 2-1 R3, R4 (R11, R12) The gain of amp1 depends on R3, R4. Gain of amp 1 = R3/R4 times. The gain of amp1 must not exceed 4 times (12 dB). R3 + R4 6 100 k (C4 = 4.7 F). 2-2 C2, C3 (C5, C6) C3 is for coupling amp 1 with amp 2 and its value is 1 F. 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 = 3 k and approximately 11 mA at R2 = 4.7 k. 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. VCC - 3.5 V VCC - Vsat D8 to D12 - VFLED ID8 to D12 = 6 R5 to 9 R5 to 9 ID8
to D12
is approximately 4 mA at R5 to 9 = 2.2 k.
No.1593-4/5
LB1412M
2-5 Reset pin (Pin 12) When the reset pin is open, peak hold of D8 to D12 occurs. When the reset pin is connected to GND, reset occurs. Connecting the reset pin to GND causes no peak hold. 2-6 C1, R1 The oscillation cycle of oscillator depends on the product of C1 and R1. The oscillation cycle at C1 = 2.2 F, R1 = 1 M is approximately 2 seconds. However, if an electrolytic capacitor is used for C1, the actual capacitance differs from the marked value. 2-7 Reduction in number of parts R3, R4, VR1 are substituted by one VR.
Unit (resistance: , capacitance: F)
No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or indirectly cause injury, death or property loss. Anyone purchasing any products described or contained herein for an above-mentioned use shall: 1 Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and expenses associated with such use: 2 Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally. Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties. This catalog provides information as of May, 1996. Specifications and information herein are subject to change without notice.
No.1593-5/5


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