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VN=23VV VOUT (2) Connecting a capacitor, CNR, from the Noise Reduction (NR) pin to ground (as shown in Figure 3) forms a low-pass filter for the voltage reference. For CNR = 10nF, the total noise in the 10Hz t0 100kHz bandwidth is reduced by approximately a factor of 2.8 for VOUT = 3.3V. This noise reduction effect is shown in Figure 4, and as RMS Noise Voltage vs CNR in the Typical Characteristics section. Noise can be further reduced by carefully choosing an output capacitor, COUT. Best overall noise performance is achieved with very low 0.22 F) or very high (> 2.2ccF) values of COUT (see the RMS Noise Voltage vs COUT typical characteristic). The REG113 uses an internal charge pump to develop an internal supply voltage sufficient to drive the gate of the DMOS pass element above VIN. The charge-pump switching noise (nominal switching frequency = 2MHz) is not measur- able at the output of the regulator over most values of IOUT and COUT.