ISD14B20
8. TYPICAL APPLICATION CIRCUIT
The following typical application examples on ISD14B20 series are for references only. They make
no representation or warranty that such applications shall be suitable for the use specified. It’s
customer’s obligation to verify the design in its own system for the functionalities, voice quality,
current consumption, and etc.
In addition, the below notes apply to the following application examples:
*
The suggested values are for references only. Depending on system requirements, they can
be adjusted for functionalities, voice quality and degree of performance.
It is important to have a separate path for each ground and power back to the related terminals to
minimize the noise. Besides, the power supplies should be decoupled as close to the device as
possible.
Also, it is crucial to follow good audio design practices in layout and power supply decoupling. See
recommendations in Application Notes from our websites.
Example #1: Operations via start and end addresses under address trigger mode (NORM )
REC
NORM
D1
1 KΩ
PLAYE
Vcc
Gnd
LED
PLAYL
XCLK
VCCA
VCCD
VCCP
S3
S2
S1
VCCD
VCCD
VSSD
μ
μ
0.1 F
10 F*
To switches or
address I/Os
VCC
S0
E3
E2
E1
E0
VCCA
VCCA
VSSA
ISD1916
μ
μ
0.1 F
10 F*
4.7 kΩ∗
VCCP
μ
4.7 F*
VCCP
μ
0.1 F
4.7 kΩ∗
μ
FT
10 F*
VSSP1
μ
10 F*
μ
0.1 F*
Mic+_AnaIn
μ
0.1 F
VSSP2
μ
0.1 F*
Mic-
AGC
Rosc
4.7μF*
SP+
SP-
Speaker
4.7 k
Ω∗
Rosc*
Publication Release Date: October 9, 2007
Revision 0
- 19 -
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