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CA3094AE Datasheet(PDF) 4 Page - Intersil Corporation |
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CA3094AE Datasheet(HTML) 4 Page - Intersil Corporation |
4 / 14 page 3-4 Operating Considerations The “Sink” Output (Terminal 8) and the “Drive” Output (Terminal 6) of the CA3094 are not inherently current (or power) limited. Therefore, if a load is connected between Terminal 6 and Terminal 4 (V- or Ground), it is important to connect a current limiting resistor between Terminal 8 and Terminal 7 (V+) to protect transistor Q13 under shorted load conditions. Similarly, if a load is connected between Terminal 8 and Terminal 7 (V+), the current limiting resistor should be connected between Terminal 6 and Terminal 4 or ground. In circuit applications where the emitter of the output transistor is not connected to the most negative potential in the system, it is recommended that a 100 Ω current limiting resistor be inserted between Terminal 7 and the V+ supply. 1/F Noise Measurement Circuit When using the CA3094, A, or B audio amplifier circuits, it is frequently necessary to consider the noise performance of the device. Noise measurements are made in the circuit shown in Figure 20. This circuit is a 30dB, non-inverting amplifier with emitter follower output and phase compensation from Terminal 2 to ground. Source resistors (RS) are set to 0Ω or 1M Ω for E noise and I noise measurements, respectively. These measurements are made at frequencies of 10Hz, 100Hz and 1kHz with a 1Hz measurement bandwidth. Typical values for 1/f noise at 10Hz and 50 µA IABC are: and . E N 18nV Hz ⁄ = I N 1.8pA Hz ⁄ = Test Circuits FIGURE 1. INPUT OFFSET VOLTAGE AND POWER SUPPLY REJECTION TEST CIRCUIT FIGURE 2. INPUT OFFSET CURRENT TEST CIRCUIT FIGURE 3. INPUT BIAS CURRENT TEST CIRCUIT CA3094 2 3 1 4 8 6 5 7 EOUT 30V 15V 100 Ω 100 Ω 1k Ω 100pF 10k Ω 9.9k Ω 300k Ω 30V NOTES: 3. Input Offset Voltage: . 4. For Power Supply Rejection Test: (1) vary V+ by -2V; then (2) vary V- by +2V. 5. Equations: 6. Power Supply Rejection: . † Maximum Reading of Step 1 or Step 2 V IO E OU T 100 ----------------- = V+ Rejection E 0 OUT E 1 OUT – 200 ------------------------------------------------- = V- Rejection E 0 OU T E 2 OUT – 200 ------------------------------------------------- = (1) (2) dB () 20 1 V REJECTIO N † --------------------------------------------- log = CA3094 2 1 4 6 8 7 EOUT 15V 1M Ω 220 Ω 0.001 µF 150k Ω 1M Ω 30V 3 5 RABC NOTES: 7. PDISSIPATION = (V+)(I) 8. I OS E OU T 106 VOLTS AMPS --------------------- -------------------------------- = CA3094A 2 3 4 5 7 300k Ω 30V - + NOTE: I I I 2 --- = 15V CA3094, CA3094A, CA3094B |
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