W523A008 Datasheet, PDF (17/19 Pages) Winbond – HIGH FIDELITY POWER SPEECH

W523AXXX
8. TYPICAL APPLICATION CIRCUIT
8.1 DAC Output
VDD (2.4V ~ 5.5V)
Rosc
VDD VDD1
OSC
LED1
TEST
STPA/BUSY
STPB
TG1
LED2/STPC
TG2
STPD
W523Axxx
TG5
STPE
TG6
AUD/SPK+
SPK-
/RESET VSS VSS1
LED 100 ohm
LED 100 ohm
Speaker
8 ohm
¼ watt
NPN T’x
Cs
Rs
Notes:
1. In principle, the playing speed determined by Rosc should correspond to the sampling rate during the coding phase. The
playing speed may be adjusted by varing Rosc, however.
2. Rs is an optional current-dividing resistor. If Rs is added, the resistance should be between 390 and 820 ohm.
3. The typical Rosc = 750 Kohm for 3 MHz Fosc; and Rosc = 1.6 Mohm for 1.5 MHz Fosc.
4. Cs is optional.
5. The DC current gain of the NPN transistor ranges from 120 to 200.
6. All unused trigger pins can be left open because of their internal pull-high resistance.
7. The OSC layout in customer’s PCB should be as closed as the OSC pad to avoid noise coupling.
8. The chip’s substrate must be wired to Vss.
9. W523A008~A010’s trigger pins are TG1, TG2, TG3, TG4; W523A012~W523A120’s trigger pins are TG1, TG2, TG5, TG6.
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Publication Release Date: May 20, 2003
Revision A3