ml2215 Oki Semiconductor, ml2215 Datasheet - Page 22

• Manufacturer Part Number: ml2215
• Description: Speech Synthesizer Plus Music Lsi With On-chip 3 Mbit Mask Rom
• Manufacturer: Oki Semiconductor

10. Low Pass Filter
ML2213’s analog output goes through the built-in Low Pass Filter. The Figure 10.1 below shows Frequency
Characteristics and Table 10.1 shows Cut-off Frequency of the LPF.
No analog output passing through the LPF is available on this chip.
11. AOUT Connecting Circuit
It is recommended to connect a capacitor of 0.01 to 0.033 F to the AOUT pin.
The circuit diaram is as shown below.
The capacitor is used for improving a voice quality. Check the voice quality before determining the capacitor
value. If the voice quality is excellent without connecting a capacitor, no capacitor is required.
1 Semiconductor
Sampling Frequency (kHz)
Figure 10.1 LPF Frequency Characteristics (f
AOUT
[dB] 20
(f
10.6
12.8
16.0
4.0
5.3
6.4
8.0
SAM
–10
–20
–30
–40
–50
–60
–70
–80
10
)
0
Table 10.1 LPF Cut-off Frequency
10
0.01 to 0.033 F
100
1 k
10 k
[Hz]
Cut-off Frequency (kHz)
SAM
= 8 kHz)
(f
1.2
1.6
2.0
2.5
3.2
4.0
5.0
CUT
)
FEDL2215-01
ML2215
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