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參數(shù)資料
| 型號： | TPA6203AIDRB |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1.25 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| 封裝： | 3 X 3 MM, GREEN, PLASTIC, SON-8 |
| 文件頁數(shù)： | 22/22頁 |
| 文件大?。?/td> | 1054K |
| 代理商： | TPA6203AIDRB |
www.ti.com
APPLICATION INFORMATION
Advantages of Fully Differential Amplifiers
APPLICATION SCHEMATICS
_
+
VDD
VO+
VO-
GND
To Battery
Cs
Bias
Circuitry
IN-
IN+
+
-
In From
DAC
SHUTDOWN
RI
C(
)
BYPASS
(Optional)
RF
TPA6203A1
SLOS364D – MARCH 2002 – REVISED JULY 2005
shift in the mid-supply affects both positive and
negative channels equally and cancels at the
FULLY DIFFERENTIAL AMPLIFIER
differential output. However, removing the bypass
The TPA6203A1 is a fully differential amplifier with
capacitor slightly worsens power supply rejection
differential inputs and outputs. The fully differential
ratio (kSVR), but a slight decrease of kSVR may be
amplifier consists of a differential amplifier and a
acceptable when an additional component can be
common- mode amplifier. The differential amplifier
eliminated (see Figure 17).
ensures that the amplifier outputs a differential volt-
Better RF-immunity: GSM handsets save power
age that is equal to the differential input times the
by turning on and shutting off the RF transmitter
gain. The common-mode feedback ensures that the
at a rate of 217 Hz. The transmitted signal is
common-mode voltage at the output is biased around
picked-up on input and output traces. The fully
VDD/2 regardless of the common- mode voltage at the
differential amplifier cancels the signal much
input.
better than the typical audio amplifier.
Input coupling capacitors not required: A fully
Figure 28 through Figure 30 show application sche-
differential amplifier with good CMRR, like the
matics for differential and single-ended inputs. Typical
TPA6203A1, allows the inputs to be biased at
values are shown in Table 1.
voltage other than mid-supply. For example, if a
DAC has mid-supply lower than the mid-supply of
Table 1. Typical Component Values
the TPA6203A1, the common-mode feedback
circuit adjusts for that, and the TPA6203A1 out-
COMPONENT
VALUE
puts
are
still
biased
at
mid-supply
of
the
RI
10 k
TPA6203A1. The inputs of the TPA6203A1 can
RF
10 k
be biased from 0.5 V to VDD - 0.8 V. If the inputs
C(BYPASS)(1)
0.22
F
are biased outside of that range, input coupling
capacitors are required.
CS
1
F
Mid-supply bypass capacitor, C(BYPASS), not re-
CI
0.22
F
quired: The fully differential amplifier does not
(1) C(BYPASS) is optional
require a bypass capacitor. This is because any
Figure 28. Typical Differential Input Application Schematic
9
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| TPA6204A1 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:1.7W MONO FULLY DIFFERENTIAL AUDIO POWER AMPLIFIER |
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| TPA6204A1DRB | 功能描述:音頻放大器 1.7-W Mono Full Diff Aud Power Amplifier RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TPA6204A1DRB | 制造商:Texas Instruments 功能描述:AUDIO POWER AMPLIFIER IC 制造商:Texas Instruments 功能描述:IC, AUDIO PWR AMP, CLASS AB, 1.7W, SON-8 |
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