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參數資料
| 型號： | TFA9812HN |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 15 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC48 |
| 封裝： | 7 X 7 MM, 0.85 MM HEIGHT, PLASTIC, MO-220, SOT619-8, HVQFN-48 |
| 文件頁數： | 14/66頁 |
| 文件大小： | 386K |
| 代理商： | TFA9812HN |
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TFA9812_2
NXP B.V. 2009. All rights reserved.
Preliminary data sheet
Rev. 02 — 22 January 2009
21 of 66
NXP Semiconductors
TFA9812
BTL stereo Class-D audio amplier with I2S input
In Legacy mode the pin AVOL (32) can be used to control the volume.
Voltage levels of 0.8 V to 2.8 V correspond linearly to control values of 00h (0 dB) to F9h
(mute). See Table 16.
An external pull-up resistor connected to the VDDD(3V3) can be applied to provide a default
volume of 0 dB. Pin AVOL has no function in I2C mode.
8.5.3 Soft mute and mute
Soft mute is available in I2C and in Legacy control modes: hard mute can be enabled only
in I2C control mode.
In I2C control mode the soft mute function smoothly reduces the gain setting for both
channels to mute level over a duration of 128/fs seconds. The smooth shape is
implemented as a raised cosine function. Soft demute results in a similar gain increase.
This implementation avoids audible plops.
A different soft mute and soft demute function is implemented in Legacy mode. This works
via the analog gain control under the control of pin AVOL. The analog volume control input
signal is rst-order low-pass ltered with a time constant of 10 ms in the digital domain.
Suddenly switching on or switching off volume by setting the control voltage to
> 2.8 V or < 0.8 V respectively will result in a fading which lasts approximately 15 ms
(switching between 0 V and 3.3 V at AVOL).
In Legacy mode the soft demute function that is part of the automatic power-up sequence
is similar to the I2C mode soft demute function described above. The I2C control for the
soft and hard mute functions can be found In Section 9.
8.5.4 Output signal and word-select polarity control
In I2C control mode the TFA9812 can switch the polarity of the stereo output signal. The
effect is a 180 degree phase shift of both output signals.
The TFA9812 also has the option of switching the polarity of the WS signal. Without
polarity inversion the left audio signal is connected to channel 1 and the right audio signal
is connected to channel 2.
8.5.5 Gain boost and clip level control
An additional gain boost of +24 dB can be selected in the TFA9812. In Legacy mode this
feature can be selected with the GAIN pin, see Table 17.
Table 16.
Volume control channel suppression table
[7:0] control value (hexadecimal)
Gain (dB)
00
0
01
0.5
...
steps of 0.5 dB
F7
123.5
F8
124
F9
mute
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| TFA9812HN/N1,518 | 功能描述:IC AMP AUDIO 15W STER D 48HVQFN RoHS:是 類別:集成電路 (IC) >> 線性 - 音頻放大器 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:DirectDrive® 類型:H 類 輸出類型:耳機，2-通道（立體聲） 在某負載時最大輸出功率 x 通道數量:35mW x 2 @ 16 歐姆 電源電壓:1.62 V ~ 1.98 V 特點:I²C，麥克風，靜音，短路保護，音量控制 安裝類型:表面貼裝 供應商設備封裝:25-WLP（2.09x2.09） 封裝/外殼:25-WFBGA，WLCSP 包裝:帶卷 (TR) |
| TFA9812HN/N1,557 | 功能描述:IC AMP AUDIO 15W STER D 48HVQFN RoHS:是 類別:集成電路 (IC) >> 線性 - 音頻放大器 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:DirectDrive® 類型:H 類 輸出類型:耳機，2-通道（立體聲） 在某負載時最大輸出功率 x 通道數量:35mW x 2 @ 16 歐姆 電源電壓:1.62 V ~ 1.98 V 特點:I²C，麥克風，靜音，短路保護，音量控制 安裝類型:表面貼裝 供應商設備封裝:25-WLP（2.09x2.09） 封裝/外殼:25-WFBGA，WLCSP 包裝:帶卷 (TR) |
| TFA9815 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Stereo full-bridge audio amplifier 2 x 17 W |
| TFA9815T | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Stereo full-bridge audio amplifier 2 x 17 W |
| TFA9815T/N1 | 制造商:NXP Semiconductors 功能描述:Tube |
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