Single-chip Voice Recording Playback Device Single Second Message

Aplus Integrated circuits Inc.

find APR9301-V2 datasheet
APR9301-V2 circuit
APLUS
Figure 4 shows the same application using external
microphone biasing instead of the microphone amplifier on
the APR9301 -V2 , thus bypassing the preamplifier portion
of the chip function.
APR9301-V2
Figure 4 Sample Application Using External Microphone Biasing
V CC ( 6 V D C )
NC
NC
NC
NC
NC
/CE
O SCR
52K
NC
NC
NC
NU1
V
SS
SP+
SP-
1
2
3
28
27
26
V
/R ecL
V
SSD
NC
/P layE
NC
NC
A naIn
NC
NC
NC
VccA_R
VccA_L
0.1 µ F
47 µ F
0.1uF
T1
Electret
M icrophone
R2
22µF
0.1µ F
10 K
1K
2K
VCC
VCC
V CC
APR9301-V2
4
5
6
7
8
9
10
11
12
13
14
25
24
23
22
21
20
19
18
17
16
15
8 Ohm Speaker
Notes:
NC = No Connect (must be floating).
Pins 23 and 27 have internal pull-up Resistors
The typical sampling frequency is 6.4 kHz with OscR = 52 kW.
NPN bipolar Transistor T1 model #MPS3904 or equivalent.
R1 and R2 are recommended to be 30 kW and 10 kW, respectively, for typical applications.
Substrate should be connected to GND.
Electrical Characteristics
Tables 2 through 4 list Absolute Maximum Ratings,
Recommended DC Characteristics, and recommended
Analog Characteristics for the
APR9301
-V2 device.
Absolute Maximum Ratings
Stresses greater than those listed in Table 2 may cause
permanent damage to the device
.
These specifications
represent a stress rating only. Operation of the device at
these or any other conditions above those specified in the
recommended DC Characteristics or recommended Analog
Characteristics of this specification is not implied. Operation
of the device at maximum conditions for extended periods
may affect reliability.
Page 4