TEA2025D Просмотр технического описания (PDF) - Unisonic Technologies
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TEA2025D Datasheet PDF : 8 Pages
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TEA2025D
LINEAR INTEGRATED CIRCUIT
■ APPLICATION INFORMATION
Input Capacitor
Input capacitor is PNP type allowing source to be referenced to ground.
In this way no input coupling capacitor is required. However, a series capacitor(0.22µF) to the input side can be
useful in case of noise due to variable resistor contact.
Bootstrap
The bootstrap connection allows to increase the output swing.
The suggested value for the bootstrap capacitors (100µF) avoids a reduction of the output signal also at low
frequencies and low supply voltage.
Voltage Gain Adjust
STEREO MODE
The voltage gain is determined by on-chip resistors R1 and R2 together with the external RfC1 series connected
between pin 8(13) and ground. The frequency response is given approximated by:
VOUT
R1
VIN
=
Rf +R2+
1
JW C1
With Rf=0,C1=100µF, the gain results 46dB with pole at f=32Hz
The purpose of RfI is to reduce the gain. It is recommended to not reduce it under 36dB.
BRIDGE MODE
Figure 7
8(13) R2
2(19)
50
Rf
R1
C1
10K
The bridge configuration is realized very easily thanks to an internal voltage divider which provides (at pin 1)the CH1
output signal after reduction. It is enough to connect pin8(inverting input of CH 2 )with a capacitor to pin 1 and to
connect to ground the pin 9.
The total gain of the bridge is given by:
VOUT
VIN
=
Rf
+R2R+1 JW1C1 (1+
R3
R4
R1
R2+R4+
1
JW C1
)
and with the suggested values (C1=C2=100µF,Rf=0)means:
Gv=52dB
Figure 8
IN
OUT
R1
10K
R2
R1
10K
R2
OUT
R3
5K
R4
50
With first pole at f=32Hz
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
5 of 8
QW-R107-017,B
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