Isd1700 series, 10 typical application circuits, Isd1700 – Rainbow Electronics ISD1700 User Manual
Page 16
ISD1700 SERIES
- 16 -
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
Vcc
ISD1700
R
OSC
V
CCA
SP+
AUD/AUX
ERASE
PLAY
REC
AGC
V
SSD
V
CCD
AnaIn
MIC -
MIC+
MISO
MOSI
SCLK
SS
FWD
VOL
V
CCA
0.1 F
μ
V
CCD
*
24
23
25
26
19
10
11
20
18
1
28
17
22
9
V
CCA
V
CCD
V
CCP
V
SSA
V
CCP
V
SSP1
SP-
V
SSP2
V
CCP
0.1 F
μ
0.1 F
μ
*
*
21
8
14
16
12
0.1 F
μ
*
INT/RDY
27
7
6
5
4
V
CC
4.7 F
μ
Ω
4.7 K
0.1 F
μ
4.7 K
Ω
0.1 F
μ
4.7 K
Ω
**
**
*** At 8kHz sampling freq, Rosc = 80 K
Rosc ***
4.7 F
μ
FT
15
13
Speaker
or Buzzer
V
CCD
Optional
Ω
100 K
Optional: based upon the applications
390
Ω
0.1 F
μ
V
CC
8050C
Speaker
AUX
AUD
Gnd
LED
1 K
Ω
D1
2
vAlert
3
RESET
0.1 F
μ
Reset
: Digital ground; : Analog ground; : Ground for SP+; : Ground for SP-