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參數資料
| 型號： | TLV1018-25YDCR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1 CHANNEL, AUDIO AMPLIFIER, PBGA4 |
| 封裝： | GREEN, DSBGA-4 |
| 文件頁數： | 9/12頁 |
| 文件大小： | 615K |
| 代理商： | TLV1018-25YDCR |
APPLICATION INFORMATION
Low Current
Built-In Gain
Airgap
Diaphragm
Electret
Connector
Backplate
V
CC
OUTPUT
GND
A-Weighted Filter
-70
-60
-50
-40
-30
-20
-10
0
10
100
1000
10000
100000
Frequency – Hz
F
il
te
r
–
d
B
V
SLVS664A – OCTOBER 2008 – REVISED NOVEMBER 2008 .......................................................................................................................................... www.ti.com
The TLV1018 has a low supply current, which allows for a longer battery life. The low supply current of 70
A
makes this amplifier optimal for microphone applications that need to be always on.
The TLV1018 is offered in the space-saving YDC package, which fits perfectly into the metal can of a
microphone. This allows the TLV1018 to be placed on the PCB inside the microphone.
The bottom side of the PCB has pins that connect the supply voltage to the amplifier and make the output
available. The input of the amplifier is connected to the microphone via the PCB.
Figure 1. Built-In Gain
The human ear has a frequency range from 20 Hz to about 20 kHz. Within this range the sensitivity of the human
ear is not equal for each frequency. To approach the hearing response, weighting filters are introduced. One of
those filters is the A-weighted filter.
The A-weighted filter is usually used in signal-to-noise ratio measurements, where sound is compared to device
noise. It improves the correlation of the measured data to the signal-to-noise ratio perceived by the human ear.
Figure 2. A-Weighted Filter
6
Copyright 2008, Texas Instruments Incorporated
Product Folder Link(s): TLV1018
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