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參數(shù)資料
| 型號(hào)： | U4080B |
| 英文描述： | Voice-Switched Circuit for Handsfree Operation |
| 中文描述： | 語音電路交換的免提操作 |
| 文件頁數(shù)： | 10/15頁 |
| 文件大?。?/td> | 169K |
| 代理商： | U4080B |
U4080B
TELEFUNKEN Semiconductors
Rev. A1, 20-May-96
Preliminary Information
10 (15)
Input Signal MIC
Non inverting
input of transmit
detector comp
CP 2 ( Pin 12 )
V
1
TDO ( Pin 23 )
2.7 x V
1
200 mV
4 V
36 mV
t
94 7828 e
Slope
CP 1 ( Pin 11 )
0.5 V/sec
dV
dt
10
A
C
2 V sec
Figure 11. Transmit detector operation
Microphone Amplifier
The microphone amplifier is non-inverting, has an inter-
nal gain of 34 dB and a nominal input impedance of
10 k
. The output impedance is typically
maximum voltage swing available is approximately 2 V
less than V
CC
, which is substantially more than what is
required in most applications. The input at Pin 9 (MIC)
should be ac coupled to the microphone so as not to upset
the bias voltage. Generally, microphone sensitivity may
be adjusted by varying the two microphone bias resistors
rather than an attempting to vary the gain of the amplifier.
15
. The
Power Supply (V+)
The voltage for the supply at Pin 16 should be in the range
of 6.0 to 11V, although the circuit will operate down to
4.0 V. The voltage can be supplied either from Tip and
Ring or from a separate supply. The required supply cur-
rent, with no signal to the speaker, is shown in figure 12
The upper curve indicates the normal operating current
when Chip Select (Pin 18) is a logic O. Figure 13 indicates
the average dc current required when supplying various
power levels to a 25
speaker. Figure 13 also shows the
minimum supply voltage required to provide the indi-
cated power levels. The peak in the power supply current
at 5.0 to 5.4 V occurs as the V
CC
circuit comes into regula-
tion.
For stability reasons, supply should be grounded properly
against ac noise. If this pin is not well filtered (by a
1000
μ
F capacitor), any variation at V+ caused by the re-
quired speaker current flowing through this pin can cause
a low frequency oscillation. The result is usually that the
circuit will cut the speaker signal on and off at the rate of
a few hertz. Experiments have shown that only a few in-
ches of wire between the supply and the IC can cause the
problem if the filter capacitor is not physically adjacent
to the IC. It is equally imperative that both ground pins
(Pins 14 and 22) have a loss connection to the power
supply ground.
I
1
V
16
( V )
4
6
8
10
0
2
4
6
8
12
CS = 0
CS = 1
94 7877 e
Select input
T
amb
= 25
°
C
Figure 12.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| U4083 | Low-Power Audio Amplifier for Telephone Applications |
| U4083B | Low-Power Audio Amplifier for Telephone Applications |
| U4083B-AFP | Low-Power Audio Amplifier for Telephone Applications |
| U4083B-AFPG3 | Low-Power Audio Amplifier for Telephone Applications |
| U4084B-FL | LOW POWER QUAD VOLTAGE COMPARATOR |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| U4082B | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Low-voltage Voice-switched IC for Hands-free Operation |
| U4082B-DEV-BOARD | 功能描述:射頻開發(fā)工具 Voice Switched Circuit RoHS:否 制造商:Taiyo Yuden 產(chǎn)品:Wireless Modules 類型:Wireless Audio 工具用于評(píng)估:WYSAAVDX7 頻率: 工作電源電壓:3.4 V to 5.5 V |
| U4082B-MFLG | 功能描述:射頻無線雜項(xiàng) COM.CORDED - VOICE SWITCHED CIRCUIT RoHS:否 制造商:Texas Instruments 工作頻率:112 kHz to 205 kHz 電源電壓-最大:3.6 V 電源電壓-最小:3 V 電源電流:8 mA 最大功率耗散: 工作溫度范圍:- 40 C to + 110 C 封裝 / 箱體:VQFN-48 封裝:Reel |
| U4082B-MFLG3G | 功能描述:射頻無線雜項(xiàng) COM.CORDED - VOICE SWITCHED CIRCUIT RoHS:否 制造商:Texas Instruments 工作頻率:112 kHz to 205 kHz 電源電壓-最大:3.6 V 電源電壓-最小:3 V 電源電流:8 mA 最大功率耗散: 工作溫度范圍:- 40 C to + 110 C 封裝 / 箱體:VQFN-48 封裝:Reel |
| U4083 | 制造商:TEMIC 制造商全稱:TEMIC Semiconductors 功能描述:Low-Power Audio Amplifier for Telephone Applications |
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