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参数资料
| 型号： | TPA2036D1YZFT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 2.5 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA9 |
| 封装： | 1.45 X 1.45 MM, LEAD FREE, BGA-9 |
| 文件页数： | 4/24页 |
| 文件大小： | 743K |
| 代理商： | TPA2036D1YZFT |
SUMMING INPUT SIGNALS WITH THE TPA2036D1
Summing Two Differential Input Signals
Gain 1 +
V
O
V
I1
+
2 x 150 kW
R
I1
V
(4)
Gain 2 +
V
O
V
I2
+
2 x 150 kW
R
I2
V
(5)
_
+
IN-
IN+
PWM
H-
Bridge
VO+
VO-
Internal
Oscillator
CS
To Battery
VDD
GND
Bias
Circuitry
RI2
+
-
Differential
Input 1
SHUTDOWN
RI1
+
-
Differential
Input 2
Filter-Free Class D
Summing a Differential Input Signal and a Single-Ended Input Signal
SLOS589 – OCTOBER 2008.............................................................................................................................................................................................. www.ti.com
Most wireless phones or PDAs need to sum signals at the audio power amplifier or just have two signal sources
that need separate gain. The TPA2036D1 makes it easy to sum signals or use separate signal sources with
different gains. Many phones now use the same speaker for the earpiece and ringer, where the wireless phone
would require a much lower gain for the phone earpiece than for the ringer. PDAs and phones that have stereo
headphones require summing of the right and left channels to output the stereo signal to the mono speaker.
Two extra resistors are needed for summing differential signals (a total of 5 components). The gain for each input
If summing left and right inputs with a gain of 1 V/V, use RI1 = RI2 = 300 k.
If summing a ring tone and a phone signal, set the ring-tone gain to Gain 2 = 2 V/V, and the phone gain to gain 1
= 0.1 V/V. The resistor values would be. . .
RI1 = 3 M, and = RI2 = 150 k.
Figure 30. Application Schematic With TPA2036D1 Summing Two Differential Inputs
Figure 31 shows how to sum a differential input signal and a single-ended input signal. Ground noise can couple
in through IN+ with this method. It is better to use differential inputs. The corner frequency of the single-ended
input is set by CI2, shown in Equation 8. To assure that each input is balanced, the single-ended input must be
driven by a low-impedance source even if the input is not in use.
12
Copyright 2008, Texas Instruments Incorporated
Product Folder Link(s): TPA2036D1
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| TPA2037D1YFFT | 功能描述:音频放大器 Fixed Gain 3.2 W Mono Class-D RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
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