參數(shù)資料
型號(hào)： PCA1070
廠商： NXP Semiconductors N.V.
英文描述： Multistandard programmable analog CMOS transmission IC
中文描述： 多標(biāo)準(zhǔn)傳輸可編程模擬CMOS集成電路
文件頁(yè)數(shù)： 8/36頁(yè)
文件大?。?/td> 180K
代理商： PCA1070
1997 Jun 20
8
Philips Semiconductors
Product specification
Multistandard programmable analog
CMOS transmission IC
PCA1070
Fig.5 Microphone arrangements.
handbook, full pagewidth
(a)
(b)
VSS
VP
MIC
+
MIC
(c)
VSS
VP
MIC
+
MIC
(d)
VSS
VP
MIC
+
MIC
MIC
+
MIC
MGE341
(a) Dynamic or piezo.
(b) Low impedance electret with built-in pre-amplifier.
(c) High impedance electret with built-in pre-amplifier.
(d) Symmetrical connection of electret.
Dynamic limiter
To prevent distortion of the transmitted speech signal, the
gain of the microphone amplifier is reduced rapidly when
signal peaks on the line exceed an internally determined
threshold level. The time in which the gain is reduced, the
attack time, is very short. The circuit stays in this
gain-reduced condition until the peaks of the sending
signal remain below the threshold level. The sending gain
then returns to normal after a time also determined on the
chip, the release time. The threshold level of the AC
peak-to-peak line voltage on pin LN is default at
3.5 V (p-p). A level of 2.6 V (p-p) can be programmed by
setting bit code DLT to logic 1.
The internal threshold level is lowered automatically if the
DC voltage setting of the circuit (V
SLPE
) is not high enough
to reach the programmed level. Also when the DC current
in the transmit output stage is insufficient to drive the line
load, the internal threshold level is lowered automatically.
Dynamic limiting considerably improves sidetone
performance in over-drive conditions (less distortion and
limited sidetone level).
DTMF channel
The PCA1070 has an asymmetrical DTMF input. Its input
impedance is 200 k
// 45 pF and its gain is default at
21 dB. DTMF signals can be sent to the line by setting
control bit ‘Sending Mute’ (SM) to logic 1 (default SM = 0);
by setting ‘Receiving Mute’ (RM) also to logic 1 (default
RM = 0), the dialling tones are also sent to the receiving
output to generate a confidence tone in the earpiece.
The gain between the DTMF input and the line LN can be
programmed between 1 dB and 21 dB in 1 dB steps using
bit code GMAx (6 bits). The confidence tone gain
(between DTMF input and earpiece outputs QR) can be
programmed between
40 dB and
19 dB (symmetrical
drive of earpiece) using bit code GRAx (6 bits). GMAx sets
the gain of the ‘sending prog-amp’ (recommended range in
DTMF mode for G
ma
=
5 to 15 dB) and GRAx sets the
gain of the ‘rec prog-amp’ (allowed range
G
ra
=
25 to 0 dB).
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PCA1070P 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Multistandard programmable analog CMOS transmission IC
PCA1070T 制造商:NXP Semiconductors 功能描述:
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PCA-1-08-HU-3-50 功能描述:FFC & FPC連接器 8P R/A UPPER CONTACTS RoHS:否 制造商:JAE Electronics 產(chǎn)品類型:Plugs 系列:HD 節(jié)距:0.5 mm 位置/觸點(diǎn)數(shù)量:40 安裝角: 安裝風(fēng)格:Cable 外殼材料:Plastic 觸點(diǎn)材料:Copper Alloy 觸點(diǎn)電鍍:Gold 電壓額定值:100 V per contact 電流額定值:0.24 A to 1 A
PCA-1-08-V-3-20 功能描述:FFC & FPC連接器 8P TOP ENTRY THRU HOLE RoHS:否 制造商:JAE Electronics 產(chǎn)品類型:Plugs 系列:HD 節(jié)距:0.5 mm 位置/觸點(diǎn)數(shù)量:40 安裝角: 安裝風(fēng)格:Cable 外殼材料:Plastic 觸點(diǎn)材料:Copper Alloy 觸點(diǎn)電鍍:Gold 電壓額定值:100 V per contact 電流額定值:0.24 A to 1 A
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