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MC9S12KG128CFU

MC9S12KG128CFU资料
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File Size : 116 KB Manufacturer:FREESCALE Description:Third, and this is important, use two separate resistors for RA and RB rather than one resistor with pins 4 and 5 connected together. This is because transistors Q2 and Q3 form a differ- ential amplifier whose gain is determined by the impedance between pins 4 and 5 as well as the quiescent current. There are a number of implications in the differential amplifier con- nection (pins 4 and 5 shorted). The most obvious is that the gain determines the way the currents split between Q2 and Q3. Therefore, any small offset or differential voltage will cause a marked imbalance in the charge and discharge cur- rents and hence the duty cycle. A more subtle result of this connection is the effective capacitance at pin 10. With pins 4 and 5 connected together, the Miller Effect as well as the compound transistor connection of Q3 and Q5 can produce several hundred picofarads at pin 10, seriously limiting the highest frequency of oscillation. The effective capacitance would have to be considered important in determining what value of external C would result in a particular frequency of oscillation. The single resistor connection is fine for very sim- ple circuits, but where performance is critical, the two sepa- rate resistors for RA and RB are recommended.

	1PCS	100PCS	1K	10K
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型号：MC9S12KG128CFU 厂家：FREESCALE 封装：4200 批号：07+ 数量：QFP80 说明：


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