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參數(shù)資料
| 型號(hào)： | TPA6138A2PW |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 0.04 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO14 |
| 封裝： | GREEN, PLASTIC, TSSOP-14 |
| 文件頁數(shù)： | 18/18頁 |
| 文件大小： | 436K |
| 代理商： | TPA6138A2PW |
SLOS704A
– JANUARY 2011 – REVISED MAY 2011
CHARGE-PUMP FLYING CAPACITOR AND VSS CAPACITOR
The charge-pump flying capacitor serves to transfer charge during the generation of the negative supply voltage.
The VSS capacitor must be at least equal to the charge-pump capacitor in order to allow maximum charge
transfer. Low-ESR capacitors are an ideal selection, and a value of 1
μF is typical. Capacitor values that are
smaller than 1
μF can be used, but the maximum output voltage may be reduced, and the device may not
operate to specifications. If the TPA6138A2 is used in highly noise-sensitive circuits, it is recommended to add a
small LC filter on the VDD connection.
DECOUPLING CAPACITORS
The TPA6138A2 is a DirectPath headphone amplifier that requires adequate power-supply decoupling to ensure
that the noise and total harmonic distortion (THD) are low. A good low equivalent-series-resistance (ESR)
ceramic capacitor, typically 1
μF, placed as close as possible to the device VDD lead works best. Placing this
decoupling capacitor close to the TPA6138A2 is important for the performance of the amplifier. For filtering
lower-frequency noise signals, a 10-
μF or greater capacitor placed near the audio power amplifier would also
help, but it is not required in most applications because of the high PSRR of this device.
GAIN-SETTING RESISTOR RANGES
The gain-setting resistors, RIN and Rfb, must be chosen so that noise, stability, and input capacitor size of the
TPA6138A2 are kept within acceptable limits. Voltage gain is defined as Rfb divided by RIN.
Selecting values that are too low demands a large input ac-coupling capacitor, CIN. Selecting values that are too
high increases the noise of the amplifier. Table 1 lists the recommended resistor values for different
inverting-input gain settings.
Table 1. Recommended Resistor Values
INPUT RESISTOR VALUE, RIN
FEEDBACK RESISTOR VALUE,
GAIN
Rfb
–1 V/V
10 k
10 k
–1.5 V/V
8.2 k
12 k
–2 V/V
15 k
30 k
–10 V/V
4.7 k
47 k
USING THE TPA6138A2 AS A SECOND-ORDER FILTER
Several audio DACs used today require an external low-pass filter to remove out-of-band noise. This is possible
with the TPA6138A2, as it can be used like a standard OPAMP. Several filter topologies can be implemented,
both single-ended and differential. In Figure 8, a multi-feedback (MFB) topology with differential input and
single-ended input is shown.
An ac-coupling capacitor to remove dc content from the source is shown; it serves to block any dc content from
the source and lowers the dc gain to 1, helping to reduce the output dc offset to a minimum.
The component values can be calculated with the help of the TI FilterPro
program available on the TI Web site
at:
Copyright
2011, Texas Instruments Incorporated
9
Product Folder Link(s): TPA6138A2
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPA6138A2PW | 制造商:Texas Instruments 功能描述:DIRECTPATH HEADPHONE DRIVER IC STEREO |
| TPA6138A2PWR | 功能描述:音頻放大器 Headphone Driver w/ Adj Gain 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 |
| TPA6139A2 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:DirectPatha?￠ 25-mW Headphone Amplifier With Programmable-Fixed Gain |
| TPA6139A2EVM | 功能描述:音頻 IC 開發(fā)工具 TPA6139A2EVM Eval Mod 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 |
| TPA6139A2PW | 功能描述:音頻放大器 25mW Headphone 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 |
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