ISD1700 SERIES
10 TYPICAL APPLICATION CIRCUITS
The following typical applications examples on ISD1700 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.
The below notes apply to the following applications examples:
*
These capacitors may be needed in order to optimize for the best voice quality, which is also dependent
upon the layout of the PCB. Depending on system requirements, they can be 10 μF, 4.7 μF or other values.
Please refer to the applications notes or consult Winbond for layout advice.
** It is important to have a separate path for each ground and power back to the related terminals to minimize
the noise. Also, the power supplies should be decoupled as close to the device as possible.
Example #1: Recording using microphone input via push-button controls
Reset
3
24
REC
RESET
LED
23
25
0.1μF
PLAY
ERASE
D1
vAlert
1 KΩ
2
26
Gnd
Vcc
FWD
**
VCCD
**
VCCA
VCCD
VCCP
19
22
1
VOL
FT
VCCD
VSSD
0.1μF
*
28
VCCA
21
8
VCCA
VSSA
VCC
*
μ
0.1
F
7
6
SS
VCCP
14
16
VCCP
SCLK
MOSI
MISO
4.7 KΩ
*
5
4
*
VSSP1
μ
0.1 F
ISD1700
μ
0.1
F
12
VSSP2
μ
4.7
F
4.7 KΩ
15
13
Speaker
or Buzzer
10
11
VCC
SP+
SP-
MIC+
MIC -
μ
0.1
F
Speaker
μ
0.1
F
17
27
AUD
AUX
AUD/AUX
INT/RDY
8050C
9
4.7 K
Ω
AnaIn
VCCD
100 KΩ
Optional
390Ω
Rosc ***
20
18
0.1μ F
ROSC
AGC
Optional: based upon the applications
μ
4.7
F
*** At 8kHz sampling freq, Rosc = 80 K
: Digital ground;
: Analog ground;
: Ground for SP+;
: Ground for SP-
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