參數(shù)資料
型號(hào)： TPA741DR
廠商： TEXAS INSTRUMENTS INC
元件分類： 音頻／視頻放大
英文描述： 0.35 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8
封裝： GREEN, PLASTIC, MS-012AA, SOIC-8
文件頁(yè)數(shù)： 6/27頁(yè)
文件大?。?/td> 760K
代理商： TPA741DR
www.ti.com
APPLICATION SCHEMATICS
Audio
Input
Bias
Control
VDD
700 mW
6
5
7
VO+
VDD
1
2
4
BYPASS
IN–
VDD/2
CI
CS
1
F
CB
2.2
F
SHUTDOWN
VO– 8
GND
From System Control
3
IN+
RI
10 k
RF
50 k
–
+
–
+
Audio
Input–
Bias
Control
VDD
700 mW
6
5
7
VO+
VDD
1
2
4
BYPASS
IN–
VDD/2
CI
CS
1
F
CB
2.2
F
SHUTDOWN
VO– 8
GND
From System Control
3
IN+
RI
10 k
RF
50 k
–
+
–
+
RI
10 k
Audio
Input+
CI
RF
50 k
TPA741
SLOS316C – JUNE 2000 – REVISED JUNE 2004
Figure 26 is a schematic diagram of a typical handheld audio application circuit, configured for a gain of –10 V/V.
Figure 26. TPA741 Application Circuit
Figure 27 is a schematic diagram of a typical handheld audio application circuit, configured for a gain of –10 V/V
with a differential input.
Figure 27. TPA741 Application Circuit With Differential Input
It is important to note that using the additional RF resistor connected between IN+ and BYPASS will cause VDD/2
to shift slightly, which could influence the THD+N performance of the amplifier. Although an additional external
operational amplifier could be used to buffer BYPASS from RF, tests in the laboratory have shown that the
THD+N performance is only minimally affected by operating in the fully differential mode as shown in Figure 27.
The following sections discuss the selection of the components used in Figure 26 and Figure 27.
14
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