參數(shù)資料
型號： 935084920112
廠商： NXP SEMICONDUCTORS
元件分類： 無繩電話/電話
英文描述： TELEPHONE SPEECH CKT, PDSO20
封裝： PLASTIC, SOT-163, SO-20
文件頁數(shù)： 5/38頁
文件大?。?/td> 303K
代理商： 935084920112
March 1994
13
Philips Semiconductors
Product specication
Low voltage versatile telephone transmission circuit
with dialler interface and transmit level dynamic limiting
TEA1064A
The output voltage of the receiving amplifier is specified for
continuous-wave drive. Fig.16 shows the maximum output
swing of the receiving amplifier as a function of the DC
voltage drop (VLN). The maximum output voltage will be
higher under speech conditions, where the ratio of the
peak to the RMS value is higher.
The gain of the receiving amplifier can be adjusted to suit
the sensitivity of the transducer used. The adjustment
range is between 20 dB and 39 dB with single-ended drive
and between 26 dB and 45 dB with differential drive. The
gain is proportional to the external resistor R4 connected
between GAR and QR
+. The overall gain between LN and
QR
+ can be found by subtracting the attenuation of the
anti-sidetone network (32 dB) from the amplifier gain.
Two external capacitors (C4 =100 pF and
C7 = 10
× C4 = 1 nF) ensure stability. A larger value may
be chosen to obtain a first-order low-pass filter. The cut-off
frequency corresponds with the time constant R4
× C4.
The relationship C7 = 10
× C4 must be maintained.
Fig.16 Maximum output swing of the receiving amplifier as a function of DC voltage drop VLN with the load at the
receiver output as parameter: valid for both supply options; THD = 2%; Iline = 15 mA.
Curve (1) is for a differential load of 47 nF (series
resistance = 100
); f = 3400 Hz.
Curve (2) is for a differential load of 450
; f = 1 kHz.
Curve (3) is for a single-ended load of 150
; f = 1 kHz.
handbook, halfpage
0
34
6
1.5
0.5
1.0
MGR071
5
VLN (V)
VQR(rms)
(V)
(2)
(3)
(1)
Automatic gain control input AGC
Automatic compensation of line loss is obtained by
connecting a resistor (R6) between AGC and VEE. This
automatic gain control varies the gain of the microphone
amplifier and receiving amplifier in accordance with the DC
line current. The control range is 6.1 dB; this corresponds
to a 5 km line of 0.5 mm diameter copper twisted-pair
cable (DC resistance = 176
/km, average
attenuation = 1.2 dB/km). The DTMF gain is not affected
by this feature.
The value of R6 must be chosen with reference to the
exchange supply voltage and its feeding bridge resistance
(see Fig.17 and Table 1). Different values of R6 give the
same line current ratios at the start and the end of the
control range. If automatic line-loss compensation is not
required the AGC pin can be left open, the amplifiers then
give their maximum gain.
相關PDF資料
PDF描述
935084920118 TELEPHONE SPEECH CKT, PDSO20
935084930112 TELEPHONE SPEECH CKT, PDIP20
0672.400 Circular Connector; MIL SPEC:MIL-C-26482, Series I, Solder; Body Material:Aluminum; Series:PT06; Number of Contacts:55; Connector Shell Size:22; Connecting Termination:Solder; Circular Shell Style:Straight Plug; Body Style:Straight
0672.500 Circular Connector; No. of Contacts:61; Series:; Body Material:Aluminum; Connecting Termination:Solder; Connector Shell Size:24; Circular Contact Gender:Pin; Circular Shell Style:Straight Plug; Insert Arrangement:24-61
935085450112 F/FAST SERIES, DUAL POSITIVE EDGE TRIGGERED D FLIP-FLOP, COMPLEMENTARY OUTPUT, PDSO14
相關代理商/技術參數(shù)
參數(shù)描述
935087-000 制造商:TE Connectivity 功能描述:301A511-51-05/164-0 - Bulk
935087N001 制造商:TE Connectivity 功能描述:301A511-51-05/164-CS7092 制造商:TE Connectivity 功能描述:301A511-51-05/164-CS7092 - Bulk
9350DC-200-0GZZZA 制造商:Siemens 功能描述:
9350DC-200-0ZZZTA 制造商:Siemens 功能描述:
9350DC-200-0ZZZZA 制造商:Siemens 功能描述:
發(fā)布緊急采購，3分鐘左右您將得到回復。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*