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CS3002-IS Datasheet(PDF) 7 Page - Cirrus Logic |
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CS3002-IS Datasheet(HTML) 7 Page - Cirrus Logic |
7 / 16 page CS3001 CS3002 7 3. CS3001/CS3002 OVERVIEW The CS3001/CS3002 amplifiers are designed for precision measurement of signals from DC to 2 kHz when operating from a supply voltage of +2.7 V to +6.7 V ( ± 1.35 to ± 3.35 V). The ampli- fiers are designed with a patented architecture that utilizes multiple amplifier stages to yield very high open loop gain at frequencies of 10 kHz and below. The amplifiers yield low noise and low offset drift while consuming relatively low supply current. An increase in noise floor above 2 kHz is the result of intermediate stages of the amplifier being operated at very low currents. The amplifiers are intended for amplifying small signals with large gains in ap- plications where the output of the amplifier can be band-limited to frequencies below 2 kHz. 3.1 Open Loop Gain and Phase Response Figure 9 illustrates the open loop gain and phase re- sponse of the CS3001/CS3002. The gain slope of the amplifier is about –100 dB/decade between 500 Hz and 60 kHz and transitions to –20 dB/de- cade between 60 kHz and its unity gain crossover frequency at about 4.8 MHz. Phase margin at unity gain is about 70 degrees; gain margin is about 20 dB. -360 -315 -270 -225 -180 -135 -90 -45 10K 100K 1M 10M 0 20 40 60 80 100 -100 dB/ dec -20 dB/ dec Figure 9. CS3001/CS3002 Open Loop Gain and Phase Response |
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