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參數(shù)資料
| 型號(hào)： | OPA1632DGNG4 |
| 英文描述： | High-Performance, Fully-Differential AUDIO OP AMP |
| 中文描述： | 高性能，全差分音頻運(yùn)算放大器 |
| 文件頁數(shù)： | 6/16頁 |
| 文件大?。?/td> | 489K |
| 代理商： | OPA1632DGNG4 |
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SBOS286A DECEMBER 2003 REVISED SEPTEMBER 2006
www.ti.com
6
APPLICATIONS INFORMATION
Figure 1 shows the OPA1632 used as a differential-output
driver for the PCM1804 high-performance audio ADC.
Supply voltages of
±
15V are commonly used for the
OPA1632. The relatively low input voltage swing required
by the ADC allows use of lower power-supply voltage, if
desired. Power supplies as low as
±
8V can be used in this
application with excellent performance. This reduces
power dissipation and heat rise. Power supplies should be
bypassed with 10
μ
F tantalum capacitors in parallel with
0.1
μ
F ceramic capacitors to avoid possible oscillations
and instability.
The V
COM
reference voltage output on the PCM1804 ADC
provides the proper input common-mode reference
voltage (2.5V). This V
COM
voltage is buffered with op amp
A
2
and drives the output common-mode voltage pin of the
OPA1632. This biases the average output voltage of the
OPA1632 to 2.5V.
The signal gain of the circuit is generally set to
approximately 0.25 to be compatible with commonly-used
audio line levels. Gain can be adjusted, if necessary, by
changing the values of R
1
and R
2
. The feedback resistor
values (R
3
and R
4
) should be kept relatively low, as
indicated, for best noise performance.
R
5
, R
6
, and C
3
provide an input filter and charge glitch
reservoir for the ADC. The values shown are generally
satisfactory. Some adjustment of the values may help
optimize performance with different ADCs.
It is important to maintain accurate resistor matching on
R
1
/R
2
and R
3
/R
4
to achieve good differential signal
balance. Use 1% resistors for highest performance. When
connected for single-ended inputs (inverting input
grounded, as shown in Figure 1), the source impedance
must be low. Differential input sources must have
well-balanced or low source impedance.
Capacitors C
1
, C
2
, and C
3
should be chosen carefully for
good distortion performance. Polystyrene, polypropylene,
NPO ceramic, and mica types are generally excellent.
Polyester and high-K ceramic types such as Z5U can
create distortion.
R
5
40
R
1
1k
R
2
1k
1k
R
4
270
R
3
270
R
6
40
C
2
1nF
C
1
1nF
0.1
μ
F
0.1
μ
F
10
μ
F
+
V+
+8V to +16V
8V to
16V
V
1/2
PCM1804
V
OCM
3
5
4
6
7
1
2
8
C
2.7nF
V
(2.5V)
Enable
(1)
Balanced or
SingleEnded
Input
OPA1632
OPA134
10
μ
F
0.1
μ
F
+
+
NOTE: (1) Leave
open
to enable.
Logic signals referenced to V
supply.
See the
Shutdown Function
section.
Figure 1. ADC Driver for Professional Audio
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參數(shù)描述 |
|---|---|
| OPA1632DGNR | 功能描述:音頻放大器 Fully DiffI/O Audio Amp 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 |
| OPA1632DGNRG4 | 功能描述:音頻放大器 Fully DiffI/O Audio Amp 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 |
| OPA1632DR | 功能描述:音頻放大器 Fully DiffI/O Audio Amp 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 |
| OPA1632DRG4 | 功能描述:音頻放大器 Fully DiffI/O Audio Amp 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 |
| OPA1641 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:High-Performance, JFET-Input AUDIO OPERATIONAL AMPLIFIERS |
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