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MAX473CUA Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX473CUA Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 12 page The MAX473/MAX474/MAX475 have excellent phase margin (the difference between 180° and the unity-gain phase angle). It is typically 63° with a load of 10k Ω in parallel with 20pF. Generally, higher phase margins indicate greater stability. Capacitive loads form an RC network with the op amp’s output resistance, causing additional phase shift that reduces the phase margin. Figure 3 shows the MAX473/MAX474/MAX475 output response when dri- ving a 390pF load in parallel with 10k Ω. When driving large capacitive loads, add an output iso- lation resistor, as shown in Figure 4. This resistor improves the phase margin by isolating the load capacitance from the amplifier output. Figure 5 shows the MAX473/MAX474/MAX475 driving a capacitive load of 1000pF using the circuit of Figure 4. Feedback Resistors The feedback resistors appear as a resistance network to the op amp’s feedback input (Figure 2). This resis- tance, combined with the op amp’s input and stray capacitance (total input capacitance), forms a pole that adds unwanted phase shift when either the total input capacitance or feedback resistance is too large. For example, using the noninverting configuration with a gain of 10, if the total capacitance at the negative input is 10pF and the effective resistance (R1 || R2) is 9kΩ, this RC network introduces a pole at fo = 1.8MHz. At input frequencies above fo, the pole introduces addi- tional phase shift, which reduces the overall bandwidth and adversely affects stability. Choose feedback resis- tors small enough so they do not adversely affect the op amp’s operation at the frequencies of interest. Overdriving the Outputs The output voltage swing for specified operation is from (VEE + 0.3V) to (VCC - 0.5V) (see Electrical Characteristics). Exercising the outputs beyond these limits drives the out- put transistors toward saturation, resulting in bandwidth degradation, response-time increase, and gain decrease (which affects linearity). Operation in this region causes a slight distortion in the output waveform, but does not adversely affect the op amp. Single/Dual/Quad, 10MHz Single-Supply Op Amps 10 ______________________________________________________________________________________ MAX473 VEE NULL 2k NULL 1 4 8 VIN VOUT R1 R2 R3 R3 = R2 R1 VIN VOUT R3 R2 R1 R3 = R2 R1 Figure 1. Offset Null Circuit Figure 2a. Reducing Offset Error Due to Bias Current: Inverting Configuration Figure 2b. Reducing Offset Error Due to Bias Current: Noninverting Configuration |
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