ml2216 Oki Semiconductor, ml2216 Datasheet - Page 40

• Manufacturer Part Number: ml2216
• Description: Oki Adpcm2 Algorithm-based Speech Synthesis Lsi
• Manufacturer: Oki Semiconductor

The external circuit composition method of speaker amplifier
As shown in the following figure, external resistance and a speaker are connected.
The speaker amplifier voltage gain from output pins SPM and SPP is given by the following equation.
The cutoff frequency fc1 at the lower frequency is given by the following equation.
The cutoff frequency fc2 at the higher frequency is given by the following equation.
When mixing with an external voice signal, an external circuit is provided as shown in the following figure.
OKI Semiconductor
External voice
fc1=
fc2=
AV1=
signal
AOUT
AOUT
12bit DAC
12bit DAC
2 x π x C2 x R2
R2
R1
2 x π x C1 x R1
x 2
1
1
C1
C1
C3
[Times]
SPIN
R1
SPIN
R1
R3
[Hz]
[Hz]
R2
C2
R2
C2
SPM
SPM
20k
20k
SPP
SPP
20k
20k
SG
SG
ML2216/ML22P16
FEDL2216FULL-03
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