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参数资料
| 型号： | TPA6203A1GQV |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 1.25 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA8 |
| 封装： | PLASTIC, BGA-8 |
| 文件页数： | 2/19页 |
| 文件大小： | 214K |
| 代理商： | TPA6203A1GQV |
TPA6203A1
SLOS364 – MARCH 2002
www.ti.com
10
APPLICATION INFORMATION
FULLY DIFFERENTIAL AMPLIFIER
The TPA6203A1 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
TPA6203A1, 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
TPA6203A1, the common-mode feedback circuit
adjusts for that, and the TPA6203A1 outputs are still
biased at mid-supply of the TPA6203A1. The inputs of
the TPA6203A1 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 (see
Figure 17).
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 28 through Figure 31 show application schematics
for differential and single-ended inputs. Typical values are
shown in Table 1.
Table 1. Typical Component Values
COMPONENT
VALUE
RI
10 k
RF
10 k
C(BYPASS)(1)
0.22
F
CS
1
F
CI
0.22
F
(1) C(BYPASS) is optional
C(BYPASS) is optional
_
+
VDD
VO+
VO–
GND
A3
B3
A1
B2
To Battery
Cs
Bias
Circuitry
IN–
IN+
C3
C2
B1
+
–
In From
DAC
SHUTDOWN
RI
C1
C(BYPASS)
RF
Figure 28. Typical Differential Input Application Schematic
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPA6203A1GQVR | 功能描述:音频放大器 Mono Fully Diff Class-AB RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TPA6203A1ZQVR | 功能描述:音频放大器 Mono Fully Diff Class-AB RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TPA6203A1ZQVRG1 | 功能描述:音频放大器 1.25W Mon,Fully Diff Class-AB Audio Amp RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TPA6204A1 | 制造商:TI 制造商全称:Texas Instruments 功能描述:1.7W MONO FULLY DIFFERENTIAL AUDIO POWER AMPLIFIER |
| TPA6204A1_07 | 制造商:TI 制造商全称:Texas Instruments 功能描述:1.7W MONO FULLY DIFFERENTIAL AUDIO POWER AMPLIFIER |
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