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參數(shù)資料
| 型號(hào)： | ADAU1592ASVZ-RL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | Class-D Audio Power Amplifier |
| 中文描述： | 24 W, 2 CHANNEL, AUDIO AMPLIFIER, PQFP48 |
| 封裝： | ROHS COMPLIANT, MS-026ABC, TQFP-48 |
| 文件頁(yè)數(shù)： | 20/24頁(yè) |
| 文件大?。?/td> | 457K |
| 代理商： | ADAU1592ASVZ-RL7 |
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ADAU1592
must be placed very close to the respective pins with direct
connection. This is important for reliable and safe operation
of the device. One additional 1 μF capacitor in parallel to the
100 nF capacitor is also recommended. A bulk bypass capacitor
of 470 μF is also recommended to remove the low frequency
ripple due to load current.
Similarly, one 100 nF capacitor is recommended between each
DVDD/DGND and AVDD/AGND. These capacitors also must
be placed close to their respective pins with direct connection.
EXTERNAL PROTECTION FOR PVDD > 15 V
As the PVDD supply voltage approaches 15 V and above, the
available headroom with maximum PVDD reduces. As with any
switching amplifier, the outputs swing to full rail and the amount
of overshoots due to parasitic elements of the package/board
would be significant. Therefore, for reliable and safe operation it
is recommended to add external protection circuits for applica-
tions requiring supply voltages >15 V. The use of an RC snubber
or a Schottky diode on the outputs should be considered.
The RC snubber should be connected between the OUTx+ and
OUTx pins for each channel. The typical recommended values
are 10 Ω and 680 pF. Also, both of these components must be
placed close to the output pins. For two channels, two resistors
and two capacitors are needed.
If Schottky diodes are preferred, the diodes must be from each
OUTx/OUTx+ pin to PVDD/PGND. So in total eight diodes
are needed for two channels. The Schottky diodes need to be
placed close to the output pins to be effective.
Rev. 0 | Page 20 of 24
CLOCK
The ADAU1592 uses 24.576 MHz for the master clock, which is
512 × f
S
(
f
S
= 48 kHz). There are several options for providing
the clock.
Option 1: Using a Quartz Crystal
A quartz crystal of 24.576 MHz frequency can be connected
between the XTI and XTO pins using two load capacitors
suitable for the crystal oscillation mode.
Option 2: Using a Ceramic Resonator
The ADAU1592 can also be used with ceramic resonators
similar to crystal by using the XTI and XTO pins.
Option 3: Using an External Clock
The ADAU1592 can be provided with an external clock of
24.576 MHz at the XTI pin. The logic level for the clock input
should be in the range of 3.3 V and 50% typical duty cycle.
For systems using multiple ADAU1592s, it is recommended to
use only one clock source if the ADAU1592s share the same
power supply to prevent the beat frequencies of asynchronous
clocks from appearing in the audio band.
Multiple ADAU1592s can be connected in a daisy chain by
providing or generating a master clock from one ADAU1592
and subsequently connecting its XTO output to the XTI input
of the next ADAU1592, and so on. However, using a simple logic
buffer between the XTO pin of one ADAU1592 to the XTI pin of
the next ADAU1592 is recommended. Because the clock output
is now buffered, it can be connected to the XTI inputs of the
remaining ADAU1592s, depending on the fanout capability of
the logic buffer used.
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