Page 1
Ordering number: EN683D
Monolithic Digital IC
LB1409
Level Meter Driver for 9 LEDs
Applications
.
AC level meters such as VU meters.
.
DC level meters such as signal meters.
Functions
.
Display
Nine red or green LEDs display the input level in the shape
of a bar.
.
Input amplifier
Wide application is available owing to built-in DC amplifier
whose gain is variable with external resistors.
.
Comparator level
Setting is made by steps of 3 dB as follows.
–18 dB, –15 dB, –12 dB, –9 dB, –6 dB, –3 dB, 0 dB,
+3 dB, +6 dB
.
Supply voltage
The recommended supply voltage range is so wide as 5.5 V
to 16 V.
(If pin Vref 2 is used, 7 V to 16 V.)
.
Reference voltage
Constant voltage output is available with external transistor
owing to pin Vref2=5V.
Package Dimensions
unit : mm
3064-DIP16
[LB1409]
SANYO : DIP16
Specifications
Comparator Level OUT Pin Voltage at Ta = 25°C, VCC=12V,Vref1=3V
Comparator level Pin No. min typ max Unit
D1 7 0.11 0.18* 0.25 V
D2 8 0.20 0.27* 0.34 V
D3 9 0.30 0.38* 0.46 V
D4 10 0.45 0.53* 0.61 V
D5 11 0.66 0.75 0.84 V
D6 12 0.97 1.06 1.15 V
D7 13 1.40 1.50 1.60 V
D8 14 2.02 2.12 2.22 V
D9 15 2.90 3.00 3.10 V
*: No overlap occurs in each individual IC.
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
53096HA(II)/8237KI/8205MW/7140KI,TS No.683-1/4
Page 2
LB1409
Absolute Maximum Ratings at Ta = 25°C
Parameter Symbol Conditions Ratings Unit
Maximum supply voltage V
Input voltage V
D1 to D9 output voltage V
D1 to D9 output current I
First reference flow-out current Iref (1) Pin 2 −1 to 0 mA
Second reference flow-out current Iref (2) Pin 16 −6 to 0 mA
V
supply voltage V
OUT
Allowable power dissipation Pd max Ta = 55°C 500 mW
Operating temperature Topr −10 to +60 °C
Storage temperature Tstg −40 to +125 °C
Allowable Operating Ranges at Ta = 25°C
Parameter Symbol Conditions Ratings Unit
Supply voltage V
Input voltage V
Output pin load resistance R
max Pin 1 −0.3 to +18 V
CC
IN
(D) D1 to D9 off −0.3 to +18 V
OUT
(D) Pin 7 to 15, D1 to D9 on +30 mA
OL
OUT
CC
+
or V
IN
IN
L
Pin 3, 4 −0.3 to V
Pin 5 −0.3 to +6 V
Pin 1,
( ): Using Vref 2
–
Pin 3 or Pin 4 –0.3 to +V
+5.5 to +16 V
(+7 to +16) V
Between pin 5 OUT and pin 6 GND. 15 k to 20 k Ω
CC
CC
V
V
Electrical Characteristics at Ta = 25°C, VCC=12V
Parameter Symbol Conditions min typ max Unit
Input bias current (Amplifier)
Input bias current (Comparator)
+ Output leakage current
Offset voltage (1) Voffset (1)
Offset voltage (2) Voffset (2)
First reference voltage Vref (1) Pin 2, Iref=0to1mA 2.6 3.0 V
Second reference voltage Vref (2) Pin 16, Iref=0to6mA 4.2 4.7 5.2 V
Current drain I
Amplifier gain VG Open loop 30 dB
Output flow-out current I
D pin output ON voltage V
D pin output leak current I
Output voltage (Amplifier) V
+
I
(A) Pin 3, V
IN
−
I
(A) Pin 4, V
IN
+
+
(C)
I
IN
IOL(A)
CC
OH
(D)
OL
(D)
OH
OH
+
=0V,V
IN
+
=3V,V
IN
+
–
=0V
IN
CC
IN
IN
IN
+
+
+
=0V,V
=6V,V
=V
=3V,V
=3V,V
Pin 5, V
GND=0V
Pin 5, V
GAIN=20dB
Pin 5, V
GAIN=20dB
Pin 1, V
Pin 5, V
Pin 7 to 15, D1 to D9, I
V
IN
–
IN
–
IN
–
IN
+
IN
–
=0V,GND=0V,
IN
–
IN
–
IN
Pin 7 to 15, D1 to D9, V
V
D1 to D9
Pin 5, VCC= 5.5 V, V
R
L
Pin 5, V
R
L
=15kΩ
CC
=15 kΩ
=12V
=12V,V
IN
IN
=3V,GND=0V –2 0 µA
=0V,GND=0V –2 0 µA
=3V,OUT=0V,
–
=V
=0V,GND=–6V,
IN
–10 0 µA
–180 +180 mV
0 +180 mV
= 0 V 10 20 mA
=0V,V
= 20 mA, V
OL
+
=0V,V
IN
+
=3V,V
+
=3V,V
= 0 V –10 mA
OUT
IN
IN
IN
–
=0V,
–
=0V,
+
IN
–
=3V,
=3V,
4V
9.5 V
1.2 V
10 µA
No.683-2/4
Page 3
LB1409
Pd max – Ta
Pin Assignment
Equivalent Circuit
Allowable power dissipation, Pd max – mW
Ambient temperature, Ta – °C
Unit (resistance: Ω)
Internal resistance: R7 (2.34 kΩ), R6 (1.66 kΩ), R5 (1.17 kΩ),
R4 (830 Ω), R3 (586 Ω), R2 (414 Ω)
No.683-3/4
Page 4
Sample Application Circuits
(All with offset adjustment)
.
Circuit not using Vref 2
LB1409
Adjusting procedures
1. Turn the center of 10 kΩ VR largely to 4.7 µF
capacitor side.
2. Input AC signal of 50/u2 mV from AC IN.
3. Adjust 1 kΩ VR so that the output at OUT becomes
500 mV DC.
Equation used in the calculation of R to be inserted
in series with LED.
Gain:20dB
R (red) = (V
R (green) = (V
–2.5)/6kΩ
CC
–2.8)/18kΩ
CC
Unit (resistance: Ω, capacitance: F)
.
Circuit using Vref 2
Adjusting procedures
.
R to be inserted in series with LED is as follows
irrespective of V
R (red) = 360 Ω (Approx. 6 mA)
R (green) = 100 Ω (Approx. 18 mA)
.
TR1 should be chosen with PCconsidered; and the
following transistors are recommended.
Red LED drive 2SD400
Green LED drive 2SD325
Unit (resistance: Ω, capacitance: F)
No products described or contained herein areintendedforuse 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.
CC
.
This catalog provides information as of May, 1996. Specifications and information herein are subject to change without notice.
No.683-4/4
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