Datenblatt-Suchmaschine für elektronische Bauteile |
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CS3001 Datenblatt(PDF) 10 Page - Cirrus Logic |
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CS3001 Datenblatt(HTML) 10 Page - Cirrus Logic |
10 / 16 page CS3001 CS3002 10 The loop gainplotshownin Figure 12 illustrates the unity gain configuration, and indicates how this is modified when using the amplifier in a higher gain configuration with compensation. If it is con- figured for higher gain, for example, 60 dB, the x–axis will move up by 60 dB (line B). Capacitor C2 adds a zero and a pole. The modified plot indi- cates the effects of introducing the pole and zero due to capacitor C2. The pole can be located at any frequency higher than the hand-over frequency, the zero has to be at a frequency lower than the hand- over frequency so as to provide adequate gain mar- gin. The separation between the pole and the zero is governed by the closed loop gain. The zero (z1) occurs at the intersection of the –100 dB/decade and –80 dB/decade slopes. The point X in the fig- ure should be at closed loop gain plus 20 dB gain margin. The value for C2 = 1/(2 πR1p1). Using p1 = 1 MHz works very well and is independent of gain. As the closed loop gain is changed, the zero location is also modified if R1 remains fixed. Capacitor C2 can be increased in value to limit the amplifier’s rising noise above 2 kHz. 3.3 Powerdown ( PDWN) The CS3001 single amplifier provides a power- down function on pin 1. If this pin is left open the amplifier will operate normally. If the powerdown is asserted low, the amplifier will go into a low power state. There is a pull-up resistor (approxi- mately 800 k ohm) inside the amplifier from pin 1 to the V+ supply. The current through this pull-up resistor is the main source of current drain in the powerdown state. 3.4 Applications The CS3001 and CS3002 amplifiers are optimum for applications that require high gain and low drift. Figure 13 illustrates a thermopile amplifier with a gain of 650 V/V. The thermopile outputs only a few millivolts when subjected to infrared radiation. The amplifier is compensated and bandlimited by C1 in combination with R2. -100 dB/dec -80 dB/dec z 1 p 1 Margin -20 dB/dec 50kHz 1MHz 5MHz Desired Closed Loop Gain X FREQUENCY B Figure 12. Loop Gain Plot: Unity Gain and with Pole-Zero Compensation |
Ähnliche Teilenummer - CS3001 |
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Ähnliche Beschreibung - CS3001 |
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