Rainbow Electronics ISD18B12 - Manual (Page 14)

ISD18B12
- 14 -
8. TYPICAL APPLICATION CIRCUIT
The following typical application examples on ISD18B12 series are for references only. They make
no representation or warranty that such applications shall be suitable for the use specified. Each
design has to be optimized in its own system for the best performance on voice quality, current
consumption, functionalities and etc. It’s customer’s obligation to confirm the design on all the
functionalities of their end-products.
In addition, the below notes apply to the following application examples:
* The suggested values are for references only. Depending on system requirements, they must
be fine tuned for best 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: Typical Recording and Playback operations
Speaker
I18B12
V
CCD
V
CCA
V
SSD
V
SSA
SP-
MICOUT
MICIN
PLAYL
RECL
0.1 F µ
0.1 F µ
Ω∗
500k Ω∗
0.1 F*
µ
10 F*
µ
SP+
10k
LEDP
PLAYL
PLAYE
RECL
RECE
RECE
PLAYE
1 K Ω
1 K Ω
SE
R
OSC
Beeping
(Optional)
TryMe
10 F*
µ 10k Ω∗
ELECTRET
MICROPHONE
Vcc
1k Ω∗
80 K Ω∗
LEDR
LEDR
FT
Or