參數(shù)資料
型號(hào)： 935264403005
廠商： NXP SEMICONDUCTORS
元件分類(lèi)： 無(wú)繩電話(huà)/電話(huà)
英文描述： TELEPHONE SPEECH CKT, UUC17
封裝： DIE-17
文件頁(yè)數(shù)： 2/30頁(yè)
文件大?。?/td> 178K
代理商： 935264403005
2000 Feb 18
10
Philips Semiconductors
Product specication
Speech circuit with dialler interface, regulated
supply and earpiece volume control
TEA1111A
The output voltage of the earpiece amplifier is specified for
continuous wave drive. The maximum output swing
depends on the DC line voltage, the RCC resistor, the ICC
current consumption of the circuit, the IP current
consumption of the peripheral circuits and the load
impedance.
Automatic gain control is provided on this amplifier for line
loss compensation.
VOLUME CONTROL (PIN VCI)
A positive DC voltage applied to pin VCI allows the gain of
the earpiece amplifier to be increased in steps of 4.85 dB.
The volume control range is 27.4 to 41.9 dB (14.5 dB
typical). A proportional voltage decoder at pin VCI defines
a gain of 27.4 dB when VVCI equals VEE and a gain of
41.9 dB when VVCI equals VDD.
The intermediate steps correspond to:
and
.
Automatic gain control (pin AGC)
The TEA1111A performs automatic line loss
compensation. The automatic gain control varies the gain
of the microphone amplifier and the gain of the receive
amplifier in accordance with the DC line current.
The control range is 6.0 dB (which corresponds
approximately to a line length of 5 km for a 0.5 mm
diameter twisted-pair copper cable with a DC resistance of
176
/km and an average attenuation of 1.2 dB/km).
The IC can be used with different configurations of feeding
bridge (supply voltage and bridge resistance) by
connecting an external resistor RAGC between pins AGC
and VEE. This resistor enables the Istart and Istop line
currents to be increased (the ratio between Istart and Istop is
not affected by the resistor). The AGC function is disabled
when pin AGC is left open circuit.
Mute function (pin MUTE)
The mute function performs the switching between the
speech mode and the dialling mode.
When MUTE is LOW, the DTMF input is enabled and the
microphone and receive amplifier inputs are disabled.
In this mode, the DTMF tones are sent to the receive
output at a low level (confidence tone).
When MUTE is HIGH, the microphone and receiving
amplifiers inputs are enabled while the DTMF input is
disabled. The MUTE input is provided with an internal
pull-up current source to VDD.
Sidetone suppression
The TEA1111A anti-sidetone network comprising
RCC // Zline,Rast1,Rast2,Rast3,RSLPE and Zbal (see Fig.10)
suppresses the transmitted signal in the earpiece.
Maximum compensation is obtained when the following
conditions are fulfilled:
The scale factor k is chosen to meet the compatibility with
a standard capacitor from the E6 or E12 range for Zbal.
In practice, Zline varies considerably with the line type and
the line length. Therefore, the value of Zbal should be for an
average line length, which gives satisfactory sidetone
suppression with short and long lines. The suppression
also depends on the accuracy of the match between Zbal
and the impedance of the average line.
The anti-sidetone network for the TEA1111A attenuates
the receive signal from the line by 32 dB before it enters
the receive stage. The attenuation is almost constant over
the whole audio frequency range.
A Wheatstone bridge configuration (see Fig.11) may also
be used.
More information on the balancing of an anti-sidetone
bridge can be obtained in our publication
“Semiconductors
for Wired Telecom Systems; Applications Handbook
IC03b”.
For ordering information, please contact the Philips
Semiconductors sales office.
V
VCI
1
3
--- VDD
=
V
VCI
2
3
--- VDD
=
R
SLPE
R
ast1
×
R
CC
R
ast2
(
R
ast3 )
+
×
=
k
R
ast2
R
ast3
R
SLPE
+
()
×
R
ast1
R
SLPE
×
------------------------------------------------------------
=
Z
bal
kZ
line
×
=
相關(guān)PDF資料
PDF描述
0785_XP161A1355PR POWER MOSFET
935262605112 8-BIT, FLASH, 33 MHz, MICROCONTROLLER, PDIP40
935262575512 8-BIT, FLASH, 33 MHz, MICROCONTROLLER, PQCC44
935262602512 8-BIT, FLASH, 33 MHz, MICROCONTROLLER, PQCC44
935262574512 8-BIT, FLASH, 33 MHz, MICROCONTROLLER, PQCC44
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
935267356112 制造商:NXP Semiconductors 功能描述:IC TEA1507PN
935268081112 制造商:NXP Semiconductors 功能描述:SUB ONLY IC
935268721125 制造商:NXP Semiconductors 功能描述:Buffer/Line Driver 1-CH Non-Inverting 3-ST CMOS 5-Pin TSSOP T/R
935269304128 制造商:ST-Ericsson 功能描述:IC AUDIO CODEC W/TCH SCRN 48LQFP
935269544557 制造商:NXP Semiconductors 功能描述:SUB ONLY TDA9587-2US1-V1.3
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*