isd1740a Winbond Electronics Corp America, isd1740a Datasheet - Page 27

• Manufacturer Part Number: isd1740a
• Description: Multi-message Single-chip Voice Record&playback Devices
• Manufacturer: Winbond Electronics Corp America

To ensure the highest quality of voice reproduction, it is important to follow good audio design
practices in layout and power supply decoupling. See Application Information or links below for
details.
Good Audio Design Practices
Single-Chip Board Layout Diagrams
Confidential
* These
Notes:
**
***
http://www.winbond-usa.com/products/isd_products/chipcorder/applicationinfo/apin11.pdf
http://www.winbond-usa.com/products/isd_products/chipcorder/applicationinfo/apin12.pdf
11.1 G
upon the layout of the PCB. Depending on system requirement, they can be 10 PF, 4.7 PF or other values.
Please refer to ChipCorder Applications section or consult Winbond for layout advice.
the noise. Also, the power supplies should be decoupled as close to the device as possible.
For Sampling Freq at 8 kHz, R2 = 80 K:
It is important to have a separate path for each ground and power back to the related terminal to minimize
Example #2:
OOD
capacitors may be needed in order to optimize for the best voice quality, which is also dependent
S2
S3
S4
S5
S6
S7
S1
A
UDIO
D
Vcc
R2 **
ESIGN
0.1 F
C2
Recording via AnaIn input
4.7 F
P
C1
P
24
23
25
26
19
22
3
7
6
5
4
20
18
10
11
P
9
RACTICES
REC
PLAY
ERASE
RESET
FT
MIC -
ANA IN
R
AGC
FWD
TE3
TE2
TE1
NC
MIC+
VOL
OSC
ISD1740A
ISD1750A
ISD1760A
- 27 -
V
V
SP-
AUD
RDY
V
SP+
V
V
V
V
LED
SSP1
SSP2
CCA
SSA
CCP
CCD
SSD
28
21
14
16
12
15
13
17
27
2
1
8
1 K :
0.1 F
R1
C6
0.1 F
C4
P
P
V
CCP
Optional: based upon the applications
C10 *
or Buzzer
Speaker
V
D1
Publication Release Date: March 28, 2005
CCD
0.1 F
vAlert
C5
0.1 F
ISD1700A SERIES
C7
P
P
C8 *
390 :
V
CC
V
CCA
Speaker
C11 *
C9 *
***
V
V
V
0.1 F
CCA
CCD
CCP
V
P
CC
8050C
Vcc
Q1
***
Gnd
Revision A0