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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(yǔ)音電路交換的免提操作 |
| 文件頁(yè)數(shù)： | 12/15頁(yè) |
| 文件大小： | 169K |
| 代理商： | U4080B |
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U4080B
TELEFUNKEN Semiconductors
Rev. A1, 20-May-96
Preliminary Information
12 (15)
Switching time
The switching times of the speakerphone circuit depend
not only on the various external components, but also on
the operating condition of the circuit at the same time a
change is to take effect. For example, the switching time
from idle to transmit is generally quicker than the
switching time from receive to transmit (or transmit to
receive).
The components which most significantly affect the
timing between the transmit and receive modes are those
at Pin 5 (transmit turn-on), Pin 6 (transmit turn-off), Pin
7 (receive turn-on), and Pin 8 (receive turn-off). These
four timing functions are not independent, but interact
since the T-R comparator operates on a relative T-R com-
parison, rather than on absolute values. The components
at Pins 11, 12, 13 and 23 affect the timing from the trans-
mit to the idle mode. Timing from the idle mode to
transmit mode is relatively quick (due to the quick
charging of the various capacitors), and is not greatly
affected by the component values. Pins 5–8 do not affect
the idle-to-transmit timing since the T-R comparator must
already be in the transmit mode for this to occur.
Additionally, the following should be noted:
1.
The RC circuits at Pins 5 and 7 have dual function in
that they affect the sensitivity of the respective log
amplifiers or in other words, how loud the speech
must be in order to gain control of the speakerphone
circuit.
2.
The RC circuit at Pin 13 also has a dual function in
that it determines the sensitivity of the transmit detec-
tor circuit.
3.
The volume control affects the switching speed and
the relative response to transmit signals in the follow-
ing manner:
When the circuit is in the receive mode, reducing the
volume control setting increases the signal at TO, and
consequently the signal to the TLI pin. Therefore, a
given signal at TI will switch the circuit into the trans-
mit mode quicker at low volume settings.
相關(guān)PDF資料 |
PDF描述 |
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| 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(wú)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(wú)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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