msm9802 Oki Semiconductor, msm9802 Datasheet - Page 40

• Manufacturer Part Number: msm9802
• Description: Voice Synthesis Ic With Built-in Mask Rom
• Manufacturer: Oki Semiconductor

FEDL9802-03-05-05
OKI Semiconductor
MSM9802/03/05-xxx
Determining CR constants
The CR oscillation frequency characteristics are shown in Figure 5.2. If f
is set to 256 kHz, use the following
osc
values as a guide (see Figure 5.2) to set the C and R2 that fit the printed-circuit board type used.
R1 = 100 kΩ, R2 = 30 kΩ, C = 30 pF
When choosing CR oscillation, the CR oscillation frequency varies according to the fluctuation of the external C
and R2.
Fluctuation of CR oscillation frequencies
When choosing CR oscillation, the error of CR oscillation frequency due to process variations of the IC is ± 4%
maximum, and the fluctuation of the CR oscillation frequency when using a capacitor (C) of ± 1% accuracy and a
resistor (R2) of ± 2% accuracy is a maximum of ± 7% approximately.
Ceramic Oscillation
Figure 6.1 shows an external circuit using a ceramic oscillator.
OSC1
OSC2
C1
C2
Figure 6.1 Ceramic Oscillation Diagram
40/53