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參數(shù)資料
| 型號： | TS4657IQT |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 2 CHANNEL, AUDIO AMPLIFIER, QCC20 |
| 封裝： | 4 X 4 MM, ROHS COMPLIANT, QFN-20 |
| 文件頁數(shù)： | 14/26頁 |
| 文件大?。?/td> | 1412K |
| 代理商： | TS4657IQT |
TS4657
Application information
21/26
4.3
Recommended power-up and power-down sequences
4.3.1
Power-up
It is recommended to power-up the TS4657 prior to applying logical data in order to ensure
correct ESD protection biasing.
When the STDBY pin is in a low state (VIL,) the circuit is in standby; when the pin is in a high
state (VIH), the circuit is enabled. An internal pull-down resistor will force the STDBY pin to
ground if no signal is applied to this pin.
The standby signal can be delayed from the power-up phase but simultaneous stimuli are
possible, as shown in Figure 51.
Figure 51.
Standby signal delayed from power-up phase
The wake-up time (Twu) of the TS4657 is defined as the time between the settlement of the
digital input signals STDBY, MCLK, BCLK, LRCLK, SDAT and 80% of the VOUTR/VOUTL
amplitude. The Twu of the circuit is typically 4.5 ms.
If all digital input signals are settled and an ON/OFF sequence is applied quickly on the
STDBY pin, the internal capacitors remain charged and the Twu is around 1 ms.
4.3.2
Power-down
As described in Section 4.2, the MCLK is internally used to supply some blocks. It is
therefore recommended not to switch off the MCLK during normal operation.
To properly power-down the device, MCLK, BCLK and LRCLK should be switched off after
the STDBY signal.
The power-down time is very short and can be considered as zero.
VCCA VCCD
STDBY
MCLK BCLK
LRCLK
t=0s min
Twu
80%
SDAT
VOUTR VOUTL
t=0s min
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