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參數(shù)資料
| 型號： | TPS9104Y |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | CELLULAR SUBSCRIBER TERMINAL POWER SUPPLY/AUDIO SYSTEM |
| 中文描述： | 移動用戶終端電源/音頻系統(tǒng) |
| 文件頁數(shù)： | 31/33頁 |
| 文件大?。?/td> | 557K |
| 代理商： | TPS9104Y |
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TPS9104
CELLULAR SUBSCRIBER TERMINAL
POWER SUPPLY/AUDIO SYSTEM
SLVS133A – AUGUST 1996 – REVISED APRIL 1998
31
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
amplifier design (continued)
The speaker and ringer amplifiers are capable of driving either dynamic or piezoelectric speakers. The gain is
set with two external resistors connected as shown. There is an inverting stage and a noninverting stage, both
of which can drive a speaker differentially. When the speaker is connected in the differential mode, the gain is
doubled. The gain equation is
G
R2
R1
2
Typically R2 is in the range of 10 k
to 100 k
and the gain can be as high as 10. The noninverting amplifier
input is connected to the internal reference and should be bypassed with a 0.1-
μ
F capacitor. The audio input
signal must be capacitor-coupled (refer to C1 in Figure 47). R1 and C1 determine the low-frequency pole (f
p
)
location. The frequency response of the input RC is:
fp
1
2
R1
C1
For a 0.22-
μ
F capacitor and a 1-k
resistor, the 3-dB point is
fp
1
2
1K
0.22
F
750 Hz
Both V
CC
and VL
supply power to the speaker and ringer amplifiers. The output of VL is used to power the
high-gain input stage, and V
CC
is used to power the low-gain high-current output stage. When driving a highly
capacitive load, series resistance should be added to minimize signal distortion.
_
+
TPS9104
Microphone
C1
R1
R2
MIC_IN–
MIC_IN+
MIC_OUT
Figure 47. Microphone Amplifier
This is a high-gain amplifier capable of driving a 10 k
load at 3 V. The gain is set using two external resistors,
R1 and R2. A low noise reference must be connected to MIC_IN+. The gain equation is: G
R2 can be in the range of 10 k
to 100 k
and the gain can be up to 100. The microphone must be either
capacitor-coupled (C1) or tied to the reference. The closed-loop –3 dB point for this amplifier is a minimum of
4 kHz. The location of the low-frequency pole can be calculated using
R2
R1
.
Typically
fp
1
2
R1
C1
.
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