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參數資料
| 型號： | TPA6139A2PW |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 0.025 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO14 |
| 封裝： | GREEN, PLASTIC, TSSOP-14 |
| 文件頁數： | 2/19頁 |
| 文件大小： | 467K |
| 代理商： | TPA6139A2PW |
10
VDD
Internal VDD
AMP Enable
1.25 V
Bandgap
Comparator
SLOS700A
– JANUARY 2011 – REVISED MAY 2011
COMPONENT SELECTION
Charge Pump
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 cannot be recommended as it limits the negative voltage swing in low impedance loads.
Decoupling Capacitors
The TPA6139A2 is a DirectPath
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 leads works best. Placing this decoupling
capacitor close to the TPA6139A2 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 also helps, but it is not required
in most applications because of the high PSRR of this device.
Gain-Setting
The gain setting is programmed with the GAIN pin individually for line driver and headphone section. Gain setting
is latched when the MUTE pin is set high. Table 1 lists the gain settings. The default gain with the gain-set pin
left open is
–2x.
Table 1. Gain Settings
Gain_set RESISTOR
GAIN
GAIN (dB)
INPUT RESISTANCE
No connect
–2.0x
6.0
37k
82k0
–1.0x
0.0
55k
49k2
–1.5x
3.5
44k
35k1
–2.3x
7.2
33k
27k3
–2.5x
8.0
31k
20k5
–3.0x
9.5
28k
15k4
–3.5x
10.9
24k
11k5
–4.0x
12.0
22k
9k09
–5.0x
14.0
18k
7k50
–5.6x
15.0
17k
6k19
–6.4x
16.1
15k
5k11
–8.3x
18.4
12k
3k90
–10x
20.0
10k
Internal Under Voltage Detection
The TPA6139A2 contains an internal precision band gap reference voltage and a comparator used to monitor the
supply voltage, VDD. The internal VDD monitor is set at 2.8V with 200mV hysteresis.
10
Copyright
2011, Texas Instruments Incorporated
Product Folder Link(s) :TPA6139A2
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPA6139A2PW | 制造商:Texas Instruments 功能描述:HEADPHONE AMPLFIER IC STEREO 32OHM 25 |
| TPA6139A2PWR | 功能描述:音頻放大器 25mW Headphone 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 |
| TPA6139A2RGTR | 功能描述:音頻放大器 DirectPath 25mW Headphone 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 |
| TPA6139A2RGTT | 功能描述:音頻放大器 DirectPath 25mW Headphone 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 |
| TPA6140A2 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:CLASS-G DIRECTPATH? STEREO HEADPHONE AMPLIFIER WITH I2C VOLUME CONTROL |
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