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參數(shù)資料
| 型號(hào)： | TS4975EIJT |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻控制 |
| 英文描述： | 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PBGA12 |
| 封裝： | LEAD FREE, FLIP CHIP, 12 PIN |
| 文件頁數(shù)： | 25/36頁 |
| 文件大小： | 870K |
| 代理商： | TS4975EIJT |
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TS4975
Application Information
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4.8
Startup time
When the TS4975 is controlled to switch from full standby (output mode 0) to another output
mode, a delay is necessary to stabilize the DC bias.This length of this delay depends on the Cb
and VCC values. A typical value can be calculated by following formula:
This formula assumes that Cb voltage is equal to 0 V. If the Cb voltage is not equal 0 V, the
startup time will be always lower.
In
Figure 63 you could easily establish typical startup time for given supply voltage and bypass
capacitor Cb.
Figure 63. Typical startup time versus bypass capacitance
4.9
Pop and click performance
The TS4975 has internal pop and click reduction circuitry which eliminates the output
transients, for example during switch-on or switch-off phases, during a switch from an output
mode to another or during change in volume. The performance of this circuitry is closely linked
to the values of the input capacitor Cin, the output capacitor Cout (for Single-Ended
configuration) and the bias voltage bypass capacitor Cb.
The value of Cin and Cout is determined by the lower cut-off frequency value requested. The
value of Cb will affect the THD+N and PSRR values in lower frequencies.
The TS4975 is optimized to have a low pop and click in the typical schematic configuration (see
Figure 1 on page 3 and Figure 2 on page 4).
During the device start-up period when the pop and click reduction is active, the value $Fxh
(1111xxxx binary) can be read from the internal device registry.
Once the device is fully operational and the pop and click is inactive, the last value of control
register can be read.
t
wu
C
b
V
CC
V
CC
1.2
–
-------------------------
×
50000
0.008 s
()
+
×
=
0.4
0.8
1.2
1.6
2.0
2.4
2.8
3.2
3.6
4.0
0
50
100
150
200
250
300
350
400
Vcc=2.5V
Vcc=3.3V
S
ta
rtu
p
t
im
e
(m
s
)
Bypass capacitor Cb (
F)
Vcc=5V
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TS4982IQT | 功能描述:音頻放大器 2W Stereo Audio Amp 125 mW 16 ohm 3 lvl 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 |
| TS4984 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:2 x 1W Stereo audio power amplifier with active low standby mode |
| TS4984EIJT | 功能描述:音頻放大器 2x1.2W stereo audio 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 |
| TS4984EIKJT | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:1.2W Stereo Audio Power Amplifier with Active Low Standby Mode |
| TS4984FC | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:1.2W Stereo Audio Power Amplifier with Active Low Standby Mode |
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