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| 型號： | TPA6204A1DGN |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1.7 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| 封裝： | MSOP-8 |
| 文件頁數(shù)： | 19/20頁 |
| 文件大?。?/td> | 647K |
| 代理商： | TPA6204A1DGN |
TPA6204A1
SLOS429 MAY 2004
www.ti.com
8
APPLICATION INFORMATION
FULLY DIFFERENTIAL AMPLIFIER
The TPA6204A1 is a fully differential amplifier with
differential inputs and outputs. The fully differential
amplifier consists of a differential amplifier and a common-
mode amplifier. The differential amplifier ensures that the
amplifier outputs a differential voltage that is equal to the
differential input times the gain. The common-mode
feedback ensures that the common-mode voltage at the
output is biased around VDD/2 regardless of the common-
mode voltage at the input.
Advantages of Fully Differential Amplifiers
D Input coupling capacitors not required: A fully
differential amplifier with good CMRR, like the
TPA6204A1, allows the inputs to be biased at voltage
other than mid-supply. For example, if a DAC has
mid-supply
lower
than
the mid-supply of the
TPA6204A1, the common-mode feedback circuit
adjusts for that, and the TPA6204A1 outputs are still
biased at mid-supply of the TPA6204A1. The inputs of
the TPA6204A1 can be biased from 0.5 V to VDD
0.8 V. If the inputs are biased outside of that range,
input coupling capacitors are required.
D Mid-supply bypass capacitor, C
(BYPASS),
not
required: The fully differential amplifier does not
require a bypass capacitor. This is because any shift
in the mid- supply affects both positive and negative
channels equally and cancels at the differential
output. However, removing the bypass capacitor
slightly worsens power supply rejection ratio (kSVR),
but a slight decrease of kSVR may be acceptable when
an additional component can be eliminated.
D Better RF-immunity: GSM handsets save power by
turning on and shutting off the RF transmitter at a rate
of 217 Hz. The transmitted signal is picked-up on input
and output traces. The fully differential amplifier
cancels the signal much better than the typical audio
amplifier.
APPLICATION SCHEMATICS
Figure 15 through Figure 17 show application schematics
for differential and single-ended inputs. Typical values are
shown in Table 1.
Table 1. Typical Component Values
COMPONENT
VALUE
RI
40 k
C(BYPASS)(1)
0.22
F
CS
1
F
CI
0.22
F
(1) C(BYPASS) is optional
_
+
VDD
VO+
VO
GND
6
5
8
7
To Battery
Cs
Bias
Circuitry
IN
IN+
4
3
2
+
In From
DAC
SHUTDOWN
RI
1
C(BYPASS)(1)
100 k
40 k
40 k
(1) C(BYPASS) is optional
Figure 15. Typical Differential Input Application Schematic
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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 |
| TPA6204A1DRBG4 | 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 |
| TPA6204A1DRBR | 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 |
| TPA6204A1DRBRG4 | 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 |
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