Thursday, September 2, 2010

RC Oscillator

For timing insensitive applications, the RC device option offers additional cost savings. The RC oscillator frequency is a function of the supply voltage, the resistor (REXT) values, capacitor (CEXT) values, and the operating temperature. In addition to this, the oscillator frequency will vary from unit to unit due to normal process parameter variation.

Furthermore, the difference in lead frame capacitance between package types also affects the oscillation frequency, especially for low CEXT values. The user needs to take intoaccount variation, due to tolerance of the external R and C components.