Datasheet LB1412M Datasheet (SANYO)

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Ordering number: EN1593B

Monolithic Digital IC

LB1412M

Level Meter for 12 LEDs

Functions and Features

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 ±3dBof20dB

Supply voltage range: 10 to 16 V

Package Dimensions

unit : mm

3045B-MFP24

[LB1412M]

SANYO : MFP24

Specifications

Absolute Maximum Ratings at Ta = 25°C

Parameter Symbol Conditions Ratings Unit Maximum supply voltage V Output current I Allowable power dissipation Pd max Ta = 60°C 380 mW Operating temperature Topr –30 to +75 °C Storage temperature Tstg –40 to +125 °C

max Pin 16 –0.3 to+18 V

Pins 2 to 6: D8 to D12, output on 30 mA

Allowable Operating Range at Ta = 25°C

Parameter Symbol Conditions Ratings Unit Supply voltage V

10 to 16 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

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LB1412M

Electrical Characteristics at Ta = 25°C, VCC=12V

Parameter Symbol Pin No. Conditions min typ max Unit

Input bias current Amp (1) I Output saturation

voltage

Amp (1) V

Amp (1) V Voltage gain Amp (1) V Input resistance Amp (2) R Load resistance Amp (2) R Output current Amp (2) I Voltage gain Amp (2) V Output current I

Output saturation voltage

Output leak current

D8 V

D1 G D2 G D3 G D4 G

Comparator level

D5 G D6 G D7 G

D9 G D10 G D11 G D12 G

Reference voltage V R pin flow-out current I R pin voltage V Oscillation frequency f

Current drain I

BIN1 OH01

OL01

GA1

IN2

OL02

GA2

sat

off

THD8

D1 D2 D3 D4 D5 D6 D7

D9 D10 D11 D12

OLR

OSC

8 –3 –0.2 0 µA 9 Pins 9, 10 short 10.5 11.2 11.6 V 9 Pins 9, 10 short 1.0 1.5 2.0 V

10 8 12 16 kΩ 11 35 50 65 kΩ 11 3 6 12 mA

17, 21 D1, D5: 3 kΩ across VZand I

18, 19, 20, 22,

D2 to D4, D6 to D7: output transistor on across V

2 to 6 D8 to D12: I

17, 21 D1, D5: output transistor off 0 30 µA

2 to 6 D8 to D12: output transistor off 0 30 µA

D8: Voltage to turn on D8 by

applying DC voltage across VZand

IN2 17 D8 light-up level: 0 dB –23 –20 –17 dB 18 D8 light-up level: 0 dB –17 –15 –13 dB 19 D8 light-up level: 0 dB –12 –10 –8 dB 20 D8 light-up level: 0 dB –8 –7 –6 dB 21 D8 light-up level: 0 dB –6 –5 –4 dB 22 D8 light-up level: 0 dB –4 –3 –2 dB 23 D8 light-up level: 0 dB –1.5 –1 –0.5 dB

3 D8 light-up level: 0 dB 0.5 1 1.5 dB 4 D8 light-up level: 0 dB 2 3 4 dB 5 D8 light-up level: 0 dB 4 5 6 dB

6 D8 light-up level: 0 dB 7 8 9 dB 13 3 kΩ across VZand I 12 VR= 0 V, OSC pin open –0.6 –0.3 –0.1 mA 12 OSC pin open 0.4 0.7 0.9 V 14 1 MΩ, 2.2 µF across VCCand V

3kΩacross V

outputs off

30 100 dB

1.8 2.0 2.2 times

LED

and I

LED

to D5 = 30 mA 1.5 2.0 V

OLD1

13 17 20 mA

1.0 1.3 V

–0.625 –0.55 –0.465 V

5.6 6.3 6.8 V

1.5 2 2.5 s 915mA

and I

LED

, all D

Allowable power dissipation, Pd max – mW

Pd max – Ta

Ambient temperature, Ta – °C

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Pin Assignment

Equivalent Circuit Block Diagram

LB1412M

10 to 16 V

Oscillator

Constantcurrent driver

Unit (resistance: Ω, capacitance: F)

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Sample Application Circuit

LB1412M

R5 2.2 k R6 2.2 k

R7 2.2 k

R8 2.2 k

R9 2.2 k

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

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 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=3kΩand 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.

D8 to D12

CC–Vsat D8 to D12–VFLED

R5 to 9

– 3.5 V

R5 to 9

10 to 16 V

Unit (resistance: Ω, capacitance: F)

D8 to D12

is approximately 4 mA at R5 to 9 = 2.2 kΩ.

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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 µF, R1=1MΩis 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: Ω, 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 andreliable, but no guarantees are made or impliedregarding 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.

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