參數(shù)資料
型號(hào)： TDA7445D
廠商： STMICROELECTRONICS
元件分類： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PDSO28
封裝： SO-28
文件頁(yè)數(shù)： 3/14頁(yè)
文件大小： 194K
代理商： TDA7445D
Figure 4 outlines how TDA7445 macro-functions
can be combined depending on the PROCESS
register settings: channels (Left, Right, Centre,
Surround) processed by each function can be 2
(L, R), 3 (L, R, C) or 4.
Two input signals are originated from analog
or digital source at 32KHz, 44.1KHz or 48KHz.
The first function selection is operated on the
PROCESS register, switching values can acti-
vate the following functions:
- ProLogic (PRO_ONLY)
- none (NO_PROCESS)
After the Loudness and Volume Control func-
tions, signals are available to four output chan-
nels.
By default, the input source is analog, the Dolby
ProLogic is enabled, the volume control is set to
0dB, the loudness is off and the equaliser is flat.
TDA7445 application functions (figs. 5-8) are
briefly described, specifying related input/output
signals and I2C registers settings; all of them
read the AUDIO_FREQ register to select the cor-
rect filter coefficients.
ProLogic (fig.5)
Input channels: L, R
Output channels: L, R, C, S
The ProLogic algorithm is a Dolby decoder which
derives four output channels from two input chan-
nels. It monitors the codified signal to detect the
presence of a dominant sound, and intensifies
the cue in this direction, in proportion to the
sound intensity. After the balance and level con-
trol, L and R signals are processed by the Adap-
tive Matrix; outputs L, R, C and S are then trans-
ferred to the master level control (S through a
dedicated filter chain).
Following I
2C registers affect the algorithm be-
haviour:
- MODE sets, through a bit mask, following stand-
ard modes:
PHANTOM_CENTER: the C channel reduced
to half power, is addressed on L and R;
NO-SURROUND: the S channel is muted;
SPLIT_SURROUND: the S channel is reduced
to half power.
- AUTOBALANCE enables or disables (AUTO-
BALANCE_ON/AUTOBALANCE_OFF) the bal-
ance of input channels;
-
PINK_NOISE
enables
or
disables
(PINK_NOISE_ON/PINK_NOISE_OFF)
the
noise generation for calibration;
-
WIDE_SURROUND
disables
or
enables
(WIDE_SURR_ON/WIDE_SURR_OFF)the
S
processing through low pass and modified
Dolby B filters;
- DELAY specifies the delay value in ms for S
channel.
Loudness (fig. 5)
Input channels: L, R, C
Output chanels: L, R, C
The Loudness filter compensates for the ear fre-
quency response, boosting low and high frequen-
cies. The LOUDNESS register value (LOUD-
NESS_ON/LOUDNESS_OFF)
enables
or
disables this algorithm.
Volume Control (fig. 5)
Input channels: L, R, C, S
Output chanels: L, R, C, S
On each channel the volume attenuation value is
applied (register VOLUME_L, VOLUME_R, VOL-
UME_C, VOLUME_S). Moreover, the signals val-
ues are rounded to the bits number specified by
bits 0-3 of AUDIO_MODE register (16, 18, 20).
TDA7445 - TDA7445D
11/14
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TDA7448 功能描述:音頻放大器 6 Ch Volume CNTRL 0 to -79dB 1.0dB CNT 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
TDA7448_04 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:6 CHANNEL VOLUME CONTROLLER
TDA744813TR 功能描述:音頻放大器 6 Ch Volume CNTRL 0 to -79dB 1.0dB CNT 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
TDA7448-EVB 功能描述:音頻 IC 開(kāi)發(fā)工具 Eval Brd for TDA7448 RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評(píng)估:TAS5614L 工作電源電壓:12 V to 38 V
TDA7449 功能描述:音頻 DSP Tone Control Digital RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風(fēng)格: 封裝 / 箱體: 封裝:Tube
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