THIS DOCUMENT IS FOR MAINTENANCE PURPOSES ONLY AND IS NOT RECOMMENDED FOR NEW DESIGNS DS 3302 -1 SL6310C 500mW SWITCHABLE AUDIO AMPLIFIER/OP AMP The SL6310C is a low power audio amplifier which can be switched off by applying a mute signal to the appropriate pin. Despite the low quiescent current consumption of 5mA (only 0.6mA when muted) a minimum output power of 400mW is available into an 8Ω load from a 9V supply. NON INV. INPUT 1 8 MUTE "B" INV. INPUT 2 7 MUTE "A" EARTH 3 6 NC OUTPUT 4 5 VCC SL6310 FEATURES MP8 DG8 DP8 Can be Muted with High or Low State inputs Operational Amplifier Configuration Works Over Wide Voltage Range Fig. 1 Pin connections, SL6310 - (top view) APPLICATIONS V Audio Amplifier for Portable Receivers Power Op. Amp High Level Active Filter CC 100µ MUTE B MUTE A 8 7 R1 220k QUICK REFERENCE DATA 100n 6 5 + 1 2 3 4 INPUT Supply Voltage: 4.5V to 13.6V Voltage Gain: 70dB Output into 8Ω on 9V Supply : 400mW (min.) OUTPUT R4 120k R2 220k 100µ 1µ ABSOLUTE MAXIMUM RATINGS Supply voltage: 15V Storage temperature: —55°C to + 125°C 8 LOAD 220n R3 4.7k Fig. 2 SL6310 Test Circuit EARTH SL6310C ELECTRICAL CHARACTERISTICS Test conditions (unless otherwise stated): Supply voltage Vcc: 7V Ambient temperature: -30°C to +85°C Mute facility : Pins 7 and 8 open circuit frequency = 1kHz Value Characteristics Units Min. Conditions Typ. Max. Supply current 5.0 7.5 mA Supply current mute (A) 0.55 1 mA Pin 7 via 470k to earth 0.6 0.9 mA Pin 8 = VCC RS ≤ 10k Supply current mute (B) 2 20 mV Input offset current 50 500 nA Input bias current (Note 1) 0.2 1 µA Input offset voltage 40 Voltage gain Input voltage range CMRR 40 Output power 400 THD 70 dB 2.1 V VCC = 4.5V 10.6 V VCC = 13V 60 dB RS ≤10K 500 mW RL = 8Ω 0.4 3 % POUT = 400mW, Gain = 28dB NOTE 1. The input bias current flows out of pins 1 and 2 due to PNP input stage Fig. 3 SL6310 lamp driver Fig. 4 SL6310 servo amplifier OPERATING NOTES Mute facility The SL6310 has two mute control pins to allow easy interfacing to inputs of high or low levels. Mute control ‘A’, pin 7, is left open circuit or connected to a voltage within 0.65 volt of Vcc (via a 100kΩ resistor) for normal operation. When the voltage on pin 7 is reduced to within 1 volt of earth (via a 100kΩ resistor) the SL6310 is muted Audio amplifier AstheSL6310 is an operational amplifier it is easy to obtain the voltage gain and frequency response required. To keep the input impedance high it is wise to feed the signal to the noninverting input as shown in Fig.2. In this example the input impedance is approximately 100kΩ. The voltage gain is determined by the ratio (R3 + R4)/R3 and should be between 3 and 30 for best results. The capacitor in series with R3, together with the input and output coupling capacitors, determines the low frequency rolloff point. The upper frequency limit is set by the device but can be restricted by connecting a capacitor across R4. Operational amplifier It is impossible to list all the application possibilities in a single data sheet but the SL6310 offers considerable advantages over conventional devices in high output current applications such as lamp drivers (Fig.3) and servo amplifiers (Fig.4) . Buffer and output stages for signal generators are another possibility together with active filter sections requiring high output current. SL6310C 80 74 72 60 GAIN (dB) GAIN (dB) 70 40 68 66 64 20 100 1k 10k 62 100k 4 8 FREQUENCY (Hz) Fig. 5 Gain v. frequency 4 MUTE B MUTE A MUTE B : PIN 8 TO SUPPLY MUTE A : PIN 7 TO EARTH BY 100k RESISTOR 0 4 8 2 0 12 VOLTAGE (V) Fig. 7 Supply current v. supply voltage 4 OUTPUT POWER (W) 1000 CURRENT IN NON - MUTED STATE (mA) NON - MUTED CURRENT IN MUTED STATE (µA) 1.2 6 0 10 Fig. 6 Gain v. supply voltage 1500 500 12 VOLTAGE (V) LOAD 0.8 8 LOAD 0.4 16 LOAD 0 0 4 8 12 VOLTAGE (V) Fig. 8 Output power v. supply voltage at 5% (max) distortion