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參數資料
| 型號： | TPA3004D2PHPG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻控制 |
| 英文描述： | 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PQFP48 |
| 封裝： | GREEN, PLASTIC, HTQFP-48 |
| 文件頁數： | 21/46頁 |
| 文件大小： | 838K |
| 代理商： | TPA3004D2PHPG4 |
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SD = 0V
GND
SLOS407E – FEBRUARY 2003 – REVISED JANUARY 2011
www.ti.com
FADE OPERATION
The FADE terminal is a logic input that controls the operation of the volume control circuitry during transitions to
and from the shutdown state and during power-up.
A logic low on this terminal, places the amplifier in the fade mode. During power-up or recovering from the
shutdown state (a logic high is applied to the SD terminal), the volume is smoothly ramped up from the mute
state, –75 dB, to the desired volume setting determined by the voltage on the volume control terminals.
Conversely, the volume is smoothly ramped down from the current state to the mute state when a logic low is
applied to the SD terminal. The timing of the volume control circuitry is controlled by an internal 60-Hz clock. This
clock determines the rate at which the gain changes when adjusting the voltage on the external volume control
pins. The gain updates every 4 clock cycles (nominally 67 ms based on a 60 Hz clock) to the next step until the
final desired gain is reached. For example, if the TPA3004D2 is currently in the +0.53 db class-D gain step and
the VOLUME pin is adjusted for maximum gain at +36 dB, the time required for the gain to reach 36dB is 14
steps x 67 ms/step = 0.938 seconds. Referencing Table 1, there are 14 steps between the +0.53 dB gain step
and the maximum gain step of +36 dB.
Figure 44 shows a scope capture of the differential output (measured across OUT+ and OUT–) with the amplifier
in the fade mode. A 1 Vpp dc voltage was applied across the differential inputs and a logic low was applied to the
SD terminal at the time defined in the figure. The figure depicts the outputs transitioning from one gain step to
the next lower step at approximately 67 ms/step.
A logic high on this pin disables the volume fade effect during transitions to and from the shutdown state and
during power-up. During power-up or recovering from the shutdown state (a logic high is applied to the SD
terminal), the transition from the mute state, –75 dB, to the desired volume setting is less than 1 ms. Conversely,
the volume ramps down from current state to the mute state within 1 ms when a logic low is applied to the SD
terminal. For the best pop performance, the fade mode should be enabled (a logic low is applied to the FADE
terminal).
Figure 44. Differential Output With FADE (Terminal 30) Held Low
Figure 45 shows a scope capture of the differential output with the fade effect disabled. The outputs transition to
the lowest gain state within 1ms of applying a logic low to the SD terminal.
28
Copyright 2003–2011, Texas Instruments Incorporated
Product Folder Link(s): TPA3004D2
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPA3004D2PHPR | 功能描述:音頻放大器 Stereo Hi-Pwr Filter-Free Class-D RoHS:否 制造商:STMicroelectronics 產品: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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TPA3004D2PHPR | 制造商:Texas Instruments 功能描述:AUDIO POWER AMPLIFIER IC |
| TPA3004D2PHPRG4 | 功能描述:音頻放大器 Stereo Hi-Pwr Filter-Free Class-D RoHS:否 制造商:STMicroelectronics 產品: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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TPA3005D2 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:6-W STEREO CLASS-D AUDIO POWER AMPLIFIER |
| TPA3005D2EVM | 功能描述:音頻 IC 開發工具 TPA3005D2 Eval Mod RoHS:否 制造商:Texas Instruments 產品:Evaluation Kits 類型:Audio Amplifiers 工具用于評估:TAS5614L 工作電源電壓:12 V to 38 V |
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