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參數資料
| 型號： | TS4982IQT |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 2 W, 2 CHANNEL, AUDIO AMPLIFIER, QCC32 |
| 封裝： | 5 X 5 MM, ROHS COMPLIANT, QFN-32 |
| 文件頁數： | 13/31頁 |
| 文件大小： | 537K |
| 代理商： | TS4982IQT |
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Application information
TS4982
20/31
Doc ID 14527 Rev 2
In this case we can consider that Rin equals Zin. So, for a desired cut-off frequency FCL, Cin
is calculated as follows:
The input impedance Zin is for the whole power supply voltage range, typically 30 k
Ω . There
is also a tolerance around the typical value (see Table 6 on page 7) and it must be taken into
account.
In the typical application, Cin =1
μ F, then FCL = 5.3 Hz. If FCL is required higher to limit low
frequencies, it must be taken account that the speaker’s PSRR performance for the low
frequency region is decreased. The headphone PSRR remains the same.
Figure 41.
PSRR vs. frequency
4.6
Gain settings
In the flat region of the frequency-response curve (no input coupling capacitor or internal
feedback loop + load effect) the gain of the loudspeaker amplifier can be set in four discrete
levels thanks to the two digital inputs G1 and G0.
The headphone amplifier gain does not depend on the loudspeaker gain setting and is kept
equal to 3.5 dB.
Cin
1
2
π Zin F
CL
----------------------------------------
=
100
1k
10k
-120
-100
-80
-60
-40
-20
0
Cb = 100nF
Cb = 220nF
Cb = 1
μF
Cb = 470nF
20k
20
PSR
R
(dB)
Frequency (Hz)
SPEAKER
V
CC
= PV
CCL,R
= 5V, Vripple = 200mV
PP
R
L ≥
4
Ω, Cb = 1μF, T
AMB
= 25
°C, Gain = 9dB
Inputs AC grounded
Table 13.
Gain settings
G1
G0
VG1
VG0
Loudspeaker
amplifier gain
(dB)
Headphone
amplifier gain
(dB)
00
VIL
93.5
01
VIL
VIH
10.5
3.5
10
VIH
VIL
12
3.5
11
VIH
13.5
3.5
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相關代理商/技術參數 |
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|---|---|
| TS4984 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:2 x 1W Stereo audio power amplifier with active low standby mode |
| TS4984EIJT | 功能描述:音頻放大器 2x1.2W stereo audio 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 |
| TS4984EIKJT | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:1.2W Stereo Audio Power Amplifier with Active Low Standby Mode |
| TS4984FC | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:1.2W Stereo Audio Power Amplifier with Active Low Standby Mode |
| TS4984IQT | 功能描述:音頻放大器 2x1W stereo audio Pwr amp 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 |
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