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參數(shù)資料
| 型號： | TDA8944AJ |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 7 W, 2 CHANNEL, AUDIO AMPLIFIER, PZIP17 |
| 封裝： | PLASTIC, DIL-BENT-SIL, 17 PIN |
| 文件頁數(shù)： | 17/20頁 |
| 文件大?。?/td> | 376K |
| 代理商： | TDA8944AJ |
Philips Semiconductors
TDA8944AJ
2 x 7 W BTL audio amplier with DC gain control
Product data
Rev. 01 — 01 March 2002
6 of 20
9397 750 09433
Koninklijke Philips Electronics N.V. 2002. All rights reserved.
For the average listening level a power dissipation of 4 W can be used for a heatsink
calculation.
8.3 Mode selection
The TDA8944AJ has three functional modes, which can be selected by applying the
proper DC voltage to pin MODE.
Standby — In this mode the current consumption is very low and the outputs are
oating. The device is in standby mode when VMODE >(VCC 0.5 V), or when the
MODE pin is left oating.
Mute — In this mode the amplier is DC-biased but not operational (no audio output).
This allows the input coupling capacitors to be charged to avoid pop-noise. The
device is in mute mode when 3.5V<VMODE <(VCC 1.5 V).
Operating — In this mode the amplier is operating normally. The operating mode is
activated at VMODE < 1.0 V.
8.3.1
Switch-on and switch-off
To avoid audible plops during supply voltage switch-on or switch-off, the device is set
to standby mode before the supply voltage is applied (switch-on) or removed
(switch-off).
The switch-on and switch-off time can be inuenced by an RC-circuit on the MODE
pin. Rapid on/off switching of the device or the rapid switching of the MODE pin may
cause ‘click-and pop-noise’. This can be prevented by proper timing of the RC-circuit
on the MODE pin.
8.4 DC gain control
The gain of both ampliers can be adjusted (logarithmic) by applying an external DC
voltage source on pin GC (see Figure 6). The DC voltage source range is
0.5 to 4.0 V. This feature can be used for volume control or a preset gain.
The maximum voltage gain is set at +30 dB and the control range is more than 80 dB,
so the minimal gain is less than
50 dB. When pin GC is not connected, the gain is
set at +24 dB.
8.5 Supply Voltage Ripple Rejection (SVRR)
The SVRR is measured with an electrolytic capacitor of 10
F on pin SVR at a
bandwidth of 10 Hz to 80 kHz. Figure 14 illustrates the SVRR as function of the
frequency. A larger capacitor value on the SVR pin improves the ripple rejection
behavior at the lower frequencies.
Table 4:
Power rating as function of headroom
Headroom
Power output (THD = 0.2%)
Power dissipation
0 dB
Po = 4 W
P = 7.8 W
12 dB
Po(ALL) = 252.4 mW
P = 4.0 W
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TDA8944AJ/N2,112 | 功能描述:音頻放大器 2X6W AUDIO AMP. + VOL. CONTROL 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 |
| TDA8944J | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:2 x 7 W stereo Bridge Tied Load BTL audio amplifier |
| TDA8944J/N1 | 制造商:NXP Semiconductors 功能描述:AMP AUDIO PWR 7W STER 17SIL |
| TDA8944J/N1,112 | 功能描述:音頻放大器 7 WATT STEREO AMP 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 |
| TDA8944J/N1112 | 制造商:NXP Semiconductors 功能描述:IC AUDIO AMP AB 7W SIP-17 |
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