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參數(shù)資料
| 型號： | AS1706-T |
| 廠商： | AUSTRIAMICROSYSTEMS AG |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1.6W Audio Power Amplifiers; Package Type: MSOP-8; Shutdown: Active Low |
| 中文描述： | 1.6 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| 封裝： | MSOP-8 |
| 文件頁數(shù)： | 13/18頁 |
| 文件大?。?/td> | 433K |
| 代理商： | AS1706-T |
13 - 18
AS1701, AS1706
Datasheet - Application Information
Select the value for R
IN
as specified in
Gain-Setting Resistors on page 12
. Choose the value for C
IN
such that f
-3dB
is well below the lowest fre-
quency of interest. Setting f
-3dB
too high can affect the low-frequency response of the device. Capacitors with dielectrics that have low-voltage
coefficients such as tantalumor alumnumelectrolytic should be used, since capacitors with high-voltage coefficients, such as ceramcs, can
increase distortion at low frequencies.
Note:
Other considerations when designing the input filter include the overall constraints of the system the frequency band of interest, and
click-and-pop suppression. Although hi-fi audio specifies a flat gain response between 20Hz and 20kHz, portable voice reproduction
devices such as mobile phones and two-way radios only need address the frequency range of the human voice (~ 300Hz to 3.5kHz).
Additionally, speakers used in portable devices typically have poor response below 150Hz. In practice, the input filter may not need to
be designed for the 20Hz to 20kHz range, which could save PCB space and design costs since only small capacitors would be
required.
Bias Bypass Capacitor
The bias bypass capacitor, C
BIAS
, improves PSRR and THD+N by reducing power supply noise at the common-mode bias node, and serves as
the primary click- and pop-suppression component. C
BIAS
is fed froman internal 25k
Ω
source, and controls the rate at which the common-mode
bias voltage rises at power-up and falls during shutdown. For optimal click- and pop-suppression, ensure that the input capacitor (C
IN
) is fully
charged (ten time constants) before C
BIAS
.
The value of C
BIAS
for best click- and pop-suppression is given by:
Note:
A larger C
BIAS
value yields higher PSRR.
Click- and Pop-Less Operation
AC-coupling capacitors (C
IN
) along with C
BIAS
facilitate click- and pop-less power-up and shutdown. The value of C
BIAS
determnes the rate at
which the md-rail bias voltage rises on power-up and falls when entering shutdown.
On power-up, C
IN
is charged to its quiescent DC voltage through the R
F
fromthe output. The current generated creates a voltage transient at
the amplifier output, which can result in an audible pop. Mnimzing the value of C
IN
reduces this effect, optimzing click-and-pop suppression.
For more information see
Bias on page 10
and
Bias Bypass Capacitor on page 13
.
Supply Bypassing
Proper power supply bypassing – connect a 0.1μF ceramc capacitor in parallel with a 10μF ceramc capacitor fromV
DD
to GND – will ensure
low-noise, low-distortion performance of the device. Additional bulk capacitance can be added as required.
Note:
Place the capacitors as close to the device as possible.
Volume Control
The addition of a digital potentiometer (AS1500 famly) used as an input attenuator, can provide simple volume control for the AS1701/AS1706.
Connect the high termnal of the AS150x to the audio input, the low termnal to ground and the AS150x wiper to C
IN
(as shown in
Figure31
). Set-
ting the wiper to the top position passes the audio signal unattenuated; setting the wiper to the lowest position fully attenuates the input.
C
BIAS
≤
10
25k
Ω
(EQ 13)
C
IN
R
IN
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