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CA3078M датащи(PDF) 5 Page - Intersil Corporation |
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CA3078M датащи(HTML) 5 Page - Intersil Corporation |
5 / 12 page 5 Application Information Compensation Techniques The CA3078A and CA3078 can be phase compensated with one or two external components depending upon the closed loop gain, power consumption, and speed desired. The recommended compensation is a resistor in series with a capacitor connected from Terminal 1 to Terminal 8. Values of the resistor and capacitor required for compensation as a function of closed loop gain are shown in Figures 25 and 26. These curves represent the compensation necessary at quiescent currents of 100 µA and 20µA, respectively, for a transient response with 10% overshoot. Figures 23 and 24 show the slew rates that can be obtained with the two different compensation techniques. Higher speeds can be achieved with input compensation, but this increases noise output. Compensation can also be accomplished with a single capacitor connected from Terminal 1 to Terminal 8, with speed being sacrificed for simplicity. Table 1 gives an indication of slew rates that can be obtained with various compensation techniques at quiescent currents of 100 µA and 20µA. Single Supply Operation The CA3078A and CA3078 can operate from a single supply with a minimum total supply voltage of 1.5V. Figures 4 and 5 show the CA3078A or CA3078 in inverting and non-inverting 20dB amplifier configurations utilizing a 1.5V type “AA” cell for a supply. The total consumption for either circuit is approximately 675nW. The output voltage swing in this configuration is 300mVP-P with a 20kΩ load. TABLE 1. UNITY GAIN SLEW RATE vs COMPENSATION - CA3078 AND CA3078A VSUPPLY = ±6V, Output Voltage (VO)= ±5V, Load Resistance (RL) = 10kΩ, Transient Response: 10% overshoot for an output voltage of 100mV, Ambient Temperature (TA) = 25 oC COMPENSATION TECHNIQUE UNITY GAIN (INVERTING) FIGURE 1 UNITY GAIN (NON-INVERTING) FIGURE 2 R1 C1 R2 C2 SLEW RATE R1 C1 R2 C2 SLEW RATE k Ω pF k ΩµFV/µskΩ pF k ΩµFV/µs CA3078 - IQ = 100µA Single Capacitor 0 750 ∞ 0 0.0085 0 1500 ∞ 0 0.0095 Resistor and Capacitor 3.5 350 ∞ 0 0.04 5.3 500 ∞ 0 0.024 Input ∞ 0 0.25 0.306 0.67 ∞ 0 0.311 0.45 0.67 CA3078A - IQ = 20µA Single Capacitor 0 300 ∞ 0 0.0095 0 800 ∞ 0 0.003 Resistor and Capacitor 14 100 ∞ 0 0.027 34 125 ∞ 0 0.02 Input ∞ 0 0.644 0.156 0.29 ∞ 0 0.77 0.4 0.4 Typical Performance Curves FIGURE 6. INPUT OFFSET VOLTAGE vs TOTAL QUIESCENT CURRENT FIGURE 7. INPUT OFFSET CURRENT vs TOTAL QUIESCENT CURRENT 1 10 100 TOTAL QUIESCENT CURRENT (µA) 3.0 2.4 1.8 1.2 0.6 0 1000 VS = ±6 TA = 25 oC RS ≤ 10kΩ CA3078A CA3078 CA3078A CA3078 1 10 1000 TOTAL QUIESCENT CURRENT (µA) 0.01 10000 TA = 25 oC 100 0.1 1 10 VS = ±6 CA3078, CA3078A |
Аналогичный номер детали - CA3078M |
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Аналогичное описание - CA3078M |
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