KA2284/KA2285 LINEAR INTEGRATED CIRCUIT 5-DOT DUAL LED LEVEL METER DRIVER The KA2284/KA2285 are a monolithic integrated circuits designed for 5-dot LED level meter drivers with a built-in rectifying ampli- fier; it is suitable for AC/DC level meters such as VU meters or signal meters. FEATURES * High gain rectifying amplifier included (Gy = 26dB). Low radiation noise when LED turns on. Logarithmic indicator for 5-dot LED of bar type. (-10, 5, 0, 3, 6dB) Constant current output. KA2284: 1, =15mA Typ. KA2285: |, =7mA Typ. Wide operating supply voltage range: Vcc = 3.5V ~ 16V Minimum number of external parts required. 9 SIP | ORDERING INFORMATION BLOCK DIAGRAM Device | Package | Operating Temperature | Ip KA2284 9 SIP 15 mA ~20C ~ KA2285 20C ~ + 80C 7mA REFERENCE VOLTAGE LED DRIVER D1 | D2 | D3 D4 et) D1 02 b3 D4 GND D5 OUTPUT INPUT Vec Capacitor to be omitted when used as a DC input signal meter Fig. 1 264 & SAMSUNG KA2284/KA2285 LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATINGS (Ta =25C) | ; Characteristic Symbol Value Unit Supply Voltage Voc 18 Vv Amp Input Voltage Vies | -05~Vec Vv . Pin 7 Voltage Vi5 6 Vv ' D Terminal Output Voltage Vp 18 v Circuit Current Iec 12 mA ! D Terminal Output Current Ip 20 mA , Power Dissipation Pp ! 1100 mW ' Operating Temperature Tora | -20 ~ +80 C ' Storage Temperature | Tere 40 ~ +125 | C 11mW/C is decreased at higher temperature than T, =25C. ELECTRICAL CHARACTERISTICS (Ta =25C, Vcc =6V, f=1KHz, unless otherwise specified) Characteristic Symbol | Test Conditions Min | Typ | Max Unit | | Circuit Current loco Vie OV i 6 85 mA TK A2284 | 11 15 18.5 D Output Current +}4_ lo V,=0.15V - mA : KA2285 5 7 9.5 ! Input Bias Current lavas -1 | / O | BA ' Amp Gain Gy Vi=0.1V 24 | 26 28 ~~) dB | Veuony / -12 | -10 -8 Vevonye -6 5 | -4 | Comparator ON Level Veron | Veuoma Oo | dB | | Veuona 2.5 3 | 35 ay rr | I Vevons | 6 5 7, * Definition of OdB: input voltage level when Vci jon 3 turn ON. (50mV) & SAMSUNG 286 Electronics KA2284/KA2285 LINEAR INTEGRATED CIRCUIT TEST CIRCUIT KA2284/KA2285 rO Vcc Ca: AC in, 2.2, is used. Fig. 2 DC in, 2.2 is shorted The recommended value of R at T, (max)=60C. Vec (V) 8~12 10~14 12~16 R (a) 47 68 91 By changing the time constant C, and C2, the response, attack and release time, may be varied. In the above ap- plication conditions, power dissipation may be operated at higher levels than the absolute maximum ratings. The wattage of R is to be determined by the total LED current and R value recommended by the R table. SAMSUNG 206