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4 / 12 page MC33304 4 MOTOROLA ANALOG IC DEVICE DATA AC ELECTRICAL CHARACTERISTICS (continued) (VCC = +6.0 V, VEE = –6.0 V, RL = 600 Ω, TA = 25°C, unless otherwise noted.) Characteristic Unit Max Typ Min Symbol Power Bandwidth (VO = 4.0 Vpp, RL = 2.0 kΩ, THD ≤ 1.0%) Awakemode BWp – 28 – kHz Distortion (VO = 2.0 Vpp, AV = +1.0) Awakemode (f = 10 kHz ) Sleepmode (f = 1.0 kHz, RL = Infinite) THD – – 0.009 0.007 – – % Open Loop Output Impedance (VO = 0 V, f = 2.0 MHz, AV = +10, IQ = 10 µA) Awakemode Sleepmode |ZO| – – 100 1000 – – Ω Differential Input Impedance (VCM = 0 V) Awakemode Sleepmode RIN – – 200 1300 – – k Ω Differential Input Capacitance (VCM = 0 V) Awakemode Sleepmode CIN – – 8.0 0.4 – – pF Equivalent Input Noise Voltage (RS = 100 Ω, f = 1.0 kHz) Awakemode Sleepmode en – – 15 60 – – nV Hz Equivalent Input Noise Current (f = 1.0 kHz) Awakemode Sleepmode in – – 0.22 0.20 – – pA Hz NOTES: 1. The differential input voltage of each amplifier is limited by two internal diodes. The diodes are connected across the inputs in parallel and opposite to each other. For more differential input voltage range, use current limiting resistors in series with the input pins. 2. The common–mode input voltage range of each amplifier is limited by diodes connected from the inputs to both power supply rails. Therefore, the voltage on either input must not exceed supply rail by more than ±500 mV. 3. Simultaneous short circuits of two or more amplifiers to the positive or negative rail can exceed the power dissipation ratings and cause eventual failure of the device. 4. Rail–to–rail performance is achieved at the input of the amplifier by using parallel NPN–PNP differential stages. When the inputs are near the negative rail (VEE < VCM < 800 mV), the PNP stage is on. When the inputs are above 800 mV (i.e. 800 mV < VCM < VCC), the NPN stage is on. This switching of the input pairs will cause a reversal of input bias current. Slight changes in the input offset voltage will be noted between the NPN and PNP pairs. Cross–coupling techniques have been used to keep this change to a minimum. 5. Power dissipation must be considered to ensure maximum junction (TJ) is not exceeded. (See Figure 2) 6. When connected as a voltage follower and used in transient conditions, a current limiting resistor may be needed between the output and the inverting input. This is because of the back to back diodes clamped across the inputs. The value of this resistor should be between 1.0 k Ω and 10 k Ω. If the amplifier does not become slew rate limited and is processing low frequency waveforms, then no resistor would be necessary. (The output could be tied directly to the negative input.) |
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