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參數(shù)資料
| 型號(hào)： | TPA6204A1DGN |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1.7 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| 封裝： | MSOP-8 |
| 文件頁(yè)數(shù)： | 2/20頁(yè) |
| 文件大小： | 647K |
| 代理商： | TPA6204A1DGN |
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TPA6204A1
SLOS429 MAY 2004
www.ti.com
10
SELECTING COMPONENTS
Resistors (RI)
The input resistor (RI) can be selected to set the gain of the
amplifier according to equation 1.
Gain = RF/RI
The internal feedback resistors (RF) are trimmed to 40 k.
Resistor matching is very important in fully differential
amplifiers. The balance of the output on the reference
voltage depends on matched ratios of the resistors.
CMRR, PSRR, and the cancellation of the second
harmonic distortion diminishes if resistor mismatch
occurs. Therefore, it is recommended to use 1% tolerance
resistors or better to keep the performance optimized.
USING LOW-ESR CAPACITORS
Low-ESR capacitors are recommended throughout this
applications section. A real (as opposed to ideal) capacitor
can be modeled simply as a resistor in series with an ideal
capacitor. The voltage drop across this resistor minimizes
the beneficial effects of the capacitor in the circuit. The
lower the equivalent value of this resistance the more the
real capacitor behaves like an ideal capacitor.
Bypass Capacitor (CBYPASS) and Start-Up Time
The internal voltage divider at the BYPASS pin of this
device sets a mid-supply voltage for internal references
and sets the output common mode voltage to VDD/2.
Adding a capacitor to this pin filters any noise into this pin
and increases kSVR. C(BYPASS) also determines the rise
time of VO+ and VO when the device is taken out of
shutdown. The larger the capacitor, the slower the rise
time. NO TAGNO TAGNO TAGNO TAGNO TAG show
the relationship of C(BYPASS) to start-up time.
Input Capacitor (CI)
The TPA6204A1 does not require input coupling
capacitors if using a differential input source that is biased
from 0.5 V to VDD 0.8 V. Use 1% tolerance or better
gain-setting resistors if not using input coupling capacitors.
In the single-ended input application an input capacitor, CI,
is required to allow the amplifier to bias the input signal to
the proper dc level. In this case, CI and RI form a high-pass
filter with the corner frequency determined in equation 2.
fc +
1
2
pR
I
C
I
3 dB
fc
The value of CI is important to consider as it directly affects
the bass (low frequency) performance of the circuit.
Consider the example where RI is 10 k and the
specification calls for a flat bass response down to 100 Hz.
Equation 2 is reconfigured as equation 3.
C
I +
1
2
pR
I
fc
In this example, CI is 0.16 F, so one would likely choose
a value in the range of 0.22
F to 0.47 F. Ceramic
capacitors should be used when possible, as they are the
best choice in preventing leakage current. When polarized
capacitors are used, the positive side of the capacitor
should face the amplifier input in most applications, as the
dc level there is held at VDD/2, which is likely higher than
the source dc level. It is important to confirm the capacitor
polarity in the application.
Decoupling Capacitor (CS)
The TPA6204A1 is a high-performance CMOS audio
amplifier that requires adequate power supply decoupling
to ensure the output total harmonic distortion (THD) is as
low as possible. Power supply decoupling also prevents
oscillations for long lead lengths between the amplifier and
the speaker. For higher frequency transients, spikes, or
digital hash on the line, a good low equivalent-series-
resistance (ESR) ceramic capacitor, typically 0.1
F to
1
F, placed as close as possible to the device VDD lead
works best. For filtering lower frequency noise signals, a
10-
F or greater capacitor placed near the audio power
amplifier also helps, but is not required in most
applications because of the high PSRR of this device.
(1)
(2)
(3)
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| TPA6204A1DRB | 功能描述:音頻放大器 1.7-W Mono Full Diff Aud Power Amplifier 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 |
| TPA6204A1DRB | 制造商:Texas Instruments 功能描述:AUDIO POWER AMPLIFIER IC 制造商:Texas Instruments 功能描述:IC, AUDIO PWR AMP, CLASS AB, 1.7W, SON-8 |
| TPA6204A1DRBG4 | 功能描述:音頻放大器 1.7-W Mono Full Diff Aud Power Amplifier 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 |
| TPA6204A1DRBR | 功能描述:音頻放大器 1.7-W Mono Full Diff Aud Power Amplifier 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 |
| TPA6204A1DRBRG4 | 功能描述:音頻放大器 1.7-W Mono Full Diff Aud Power Amplifier 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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