g

Page 3

Figure 3

Sample Application for the APR9301-V2

Table 1

Typical Dependence of Sampling Frequency and Total Voice Duration on OscR Resistor Value

Pin 7 - OscR

Typical Sampling Frequency

Cutoff Frequency (3 dB Point)

Typical Total Voice Duration

38 k

W

8 kHz

3.4 kHz

16 seconds

52 k

W

6.4 kHz

2.7 kHz

20 seconds

67 k

W

5.3 kHz

2.3 kHz

24 seconds

89 k

W

4.0 kHz

1.7 kHz

32 seconds

NC

NC

NC

NC

NC

/C E

O scR

NC

NC

NC

NU1

SP+

SP-

/LED

NC

/P la yE

NC

Ana O ut

Ana In

AGC

MicR e f

MicIn

VccA_R

VccA_L

28

27

26

25

24

23

22

21

20

19

18

17

16

15

1

2

3

4

5

6

7

8

9

10

11

12

13

14

/R e cL

52K

8 Ohm Speaker

1K

0.1 µF

47u

0.1uF

4.7 µ F

22 0K

4.7K

22µF

4.7K

0.1µ F

Electre t

M icrophone

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 k

W.

Substrate should be connected to GND.

150K

VC C

0.1µ F

1K

VC C(6VDC)

VC C

VC C

For low power applications

use double pole switch.

APLUS

APR9301-V2