ISD1700A Datasheet, PDF (26/31 Pages) Winbond – Multi-Message Single-Chip Voice Record&Playback Devices

ISD1700A SERIES
11 TYPICAL APPLICATION CIRCUITS
Two example circuits illustrate recording via MIC and AnaIn inputs, respectively. These examples
show typical implementations of ISD1740A/50A/60A devices. .
Example #1:
V_CC
4.7 K Ω
4.7 K Ω
Vcc
4.7µ F
0.1 µF
0.1 µF
4.7 KΩ
24 _REC
23 _PLAY
25 _ERASE
26 _FWD
19 _VOL
3
RESET
22 _FT
7 _TE3
6 _TE2
5 _TE1
4 _NC
ISD1740A
ISD1750A
ISD1760A
10
MIC+
11
MIC -
9 _{ANA IN}
**
Sample Freq [kHz]: 12 8 6.4 4
Rosc [KΩ]
60 80 100 160
Rosc **
20 _ROSC
18 _AGC
4.7 µF
vAlert
LED ^{2 1 KΩ}
D1
V_CC
V_CCD
V_CCD 1
V_SSD ²⁸
0.1 µF
*
***
V_CCA
V_CCD
V_CCP
***
V_CCA 21
V_CCA
V_SSA 8
0.1µ F
*
V_CCP 14
V_CCP
V_SSP1 16 0.1µF
*
0.1
µ
F
*
V_SSP2 12
SP+ ¹⁵
SP- ¹³
Speaker
or Buzzer
V_CC
Speaker
AUD ¹⁷
RDY ²⁷
R6
390 Ω
Q1
8050C
C5
0.1µ F
Optional: based upon the applications
Recording via MIC input
Notes:
* 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 ChipCorder Applications section or consult Winbond for layout advice.
** For Sampling Freq at 8 kHz, Rosc = 80 KΩ
*** It is important to have a separate path for each ground and power back to each terminal to minimize the
noise. Also, the power supplies should be decoupled as close to the device as possible.
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