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参数资料
| 型号： | TDA7445 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDIP28 |
| 封装： | DIP-28 |
| 文件页数： | 3/14页 |
| 文件大小： | 194K |
| 代理商： | TDA7445 |
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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| TDA7448 | 6 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO20 |
| TDA744813TR | 6 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO20 |
| TDA7449L | 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDIP20 |
| TDA7449 | 2 CHANNEL(S), TONE CONTROL CIRCUIT, PDIP20 |
| TDA7449D | 2 CHANNEL(S), TONE CONTROL CIRCUIT, PDSO20 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TDA7448 | 功能描述:音频放大器 6 Ch Volume CNTRL 0 to -79dB 1.0dB CNT RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TDA7448_04 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:6 CHANNEL VOLUME CONTROLLER |
| TDA744813TR | 功能描述:音频放大器 6 Ch Volume CNTRL 0 to -79dB 1.0dB CNT RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TDA7448-EVB | 功能描述:音频 IC 开发工具 Eval Brd for TDA7448 RoHS:否 制造商:Texas Instruments 产品:Evaluation Kits 类型:Audio Amplifiers 工具用于评估:TAS5614L 工作电源电压:12 V to 38 V |
| TDA7449 | 功能描述:音频 DSP Tone Control Digital RoHS:否 制造商:Texas Instruments 工作电源电压: 电源电流: 工作温度范围: 安装风格: 封装 / 箱体: 封装:Tube |
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