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CA3160 データシート(PDF) 9 Page - Intersil Corporation |
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CA3160 データシート(HTML) 9 Page - Intersil Corporation |
9 / 18 page 9 Error-Amplifier in Regulated Power Supplies The CA3160 is an ideal choice for error-amplifier service in regulated power supplies since it can function as an error- amplifier when the regulated output voltage is required to approach zero. The circuit shown in Figure 6 uses a CA3160 as an error amplifier in a continuously adjustable 1A power supply. One of the key features of this circuit is its ability to regulate down to the vicinity of 0V with only one DC power supply input. An RC network, connected between the base of the output drive transistor and the input voltage, prevents “turn-on overshoot”, a condition typical of many operational amplifier regulator circuits. As the amplifier becomes operational, this RC network ceases to have any influence on the regulator performance. Precision Voltage-Controlled Oscillator The circuit diagram of a precision voltage-controlled oscillator is shown in Figure 7. The oscillator operates with a tracking error in the order of 0.02% and a temperature coefficient of 0.01%/oC. A multivibrator (A1) generates pulses of constant amplitude (V) and width (T2). Since the output (Terminal 6) of A1 (a CA3130) can swing within about 10mV of either supply- rail, the output pulse amplitude (V) is essentially equal to V+. The average output voltage (EAVG = V T2/T1) is applied to the non-inverting Input terminal of comparator A2 via an integrating network R3, C2. Comparator A2 operates to establish circuit conditions such that EAVG = V1. This circuit condition is accomplished by feeding an output signal from Terminal 6 of A2 through R4, D4 to the inverting terminal (Terminal 2) of A1, thereby adjusting the multivibrator interval, T3. Voltmeter With High Input Resistance The voltmeter circuit shown in Figure 8 illustrates an application in which a number of the CA3160 characteristics are exploited. Range-switch SW1 is ganged between input and output circuitry to permit selection of the proper output voltage for feedback to Terminal 2 via 10k Ω current-limiting resistor. The circuit is powered by a single 8.4V mercury battery. With zero input signal, the circuit consumes somewhat less than 500 µA plus the meter current required to indicate a given voltage. Thus, at full scale input, the total supply current rises to slightly more than 1500 µA. Function Generator A function generator having a wide tuning range is shown in Figure 9. The adjustment range, in excess of 1,000,000/1, is accomplished by a single potentiometer. Three operational amplifiers are utilized: a CA3160 as a voltage follower, a CA3080 as a high speed comparator, and a second CA3080A as a programmable current source. Three variable capacitors C1, C2, and C3 shape the triangular signal between 500kHz and 1MHz. Capacitors C4, C5, and the trimmer potentiometer in series with C5 maintain essentially constant (+10%) amplitude up to 1MHz. CA3085 1 2 6 3 0.001 µF 4 7 6 13 8 1 5 12 CD4007A “SWITCHES” 10 3 14 11 2 9 4 7 806K 1% 402K 1% 200K 1% 806K 1% 6 13 8 1 12 CD4007A “SWITCHES” 10 3 100K 1% (2) 806K 6 13 8 12 CD4007A “SWITCHES” 10 3 806K 1% 806K 1% 1% (4) 806K 1% (8) 806K 1% 1 5 806K 1% 750K 1% 10V LOGIC INPUTS PARALLELED RESISTORS +10.010V LSB MSB 98 7 6 5 4 32 1 8 +10.010V 22.1K 1% 1K 3.83K 1% 2 µF 25V + - +15V 62 VOLTAGE REGULATOR REGULATED VOLTAGE ADJUST CA3160 3 4 2 0.1 µF + - 1 5 6 2K +15V 100K VOLTAGE FOLLOWER 7 OFFSET NULL OUTPUT LOAD 10K BIT REQUIRED RATIO-MATCH 1 Standard 2 ±0.1% 3 ±0.2% 4 ±0.4% 5 ±0.8% 6 - 9 ±1% ABS. FIGURE 5. 9-BIT DAC USING CMOS DIGITAL SWITCHES AND CA3160 806K 1% 5 CA3160 |
同様の部品番号 - CA3160 |
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同様の説明 - CA3160 |
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