參數(shù)資料
型號(hào)： UCB1100
廠商： NXP Semiconductors N.V.
英文描述： Advanced modem/audio analog front-end
中文描述： 先進(jìn)的調(diào)制解調(diào)器/音頻模擬前端
文件頁(yè)數(shù)： 12/36頁(yè)
文件大小： 290K
代理商： UCB1100
Philips Semiconductors
Preliminary specification
UCB1100
Advanced modem/audio analog front-end
1998 May 08
12
6.2
The telecom codec contains an input channel, built up from a 64
times oversampling sigma delta analogue to digital converter (ADC)
with digital decimation filters, programmable attenuation and build in
sidetone suppression circuit. The output path consist of a digital up
sample filter, a 64 time oversampling 4 bit digital to analogue
converter (DAC) circuit followed by a differential output driver,
capable of directly driving a 600ohm isolation transformer. The
output path includes a mute function. The telecom codec also
incorporates a loopback mode, in which codec output path and the
input path are connected in series.
Telecom codec
The telecom sample rate is derived from the SIB interface clock pin
(sibclk) and is programmable through the SIB interface. The telecom
sample rate is given by the following formula:
Fst
(2 * Fsibclk)
(64 * telecom_divisor)
(5
telecom_divisor
128)
For example, a sibclk of 10 MHz, with a divisor of 40, results in a
telecom sample rate of 7.813kHz. Both the rising and the falling
edges of the sibclk are used in case an odd telecom_divisor is set.
In that case a 50% duty cycle of the sibclk signal is mandatory to
obtain time equidistant sampling.
The input path of the telecom codec has a programmable
attenuation. It also implements a voice band filter, which consists of
an digital low pass filter, which is a part of the decimation filter.
Therefore the pass band of the voice band filter is determined by the
selected telecom codec sample rate. This voice band filter is
activated by the high pass enablebit in the telecom control register
B. The resulting telecom input filter curves are given in Figures 11
and 12.
The output section of the telecom codec is designed to interface with
a 600 ohm line through an isolation transformer. The built in mute
function is activated by the mutebit in the telecom control register B.
The output driver remains active in the mute mode, however no
output signal is produced.
tinp
tinn
toutp
toutn
mute
echo on
loopback
mux
attenuation
1 bit ADC
effect
4 bit DAC
effect
4
64fs
telecom output enable
4
64fs
side tone suppression
telecom input enable
loop inputs
FIR
16
reDC
hWDF
2
hWDF
2
+3dB
higFIR
round
up
14
fs
loFIR
2
haFIR
2
rup
loop inputs
haFIR
2
+3dB
haFIR
2
reDC
14
fs
noise
shaper
interpolator
4
SN00134
Figure 9.
Detailed Block Diagram Telecom codec
相關(guān)PDF資料
PDF描述
UCB1100LP Advanced modem/audio analog front-end
UCB1200 Advanced modem/audio analog front-end
UCB1200BE Advanced modem/audio analog front-end
UCB1300 Advanced modem/audio analog front-end
UCB1300BE Advanced modem/audio analog front-end
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
UCB1100LP 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:Advanced modem/audio analog front-end
UCB1100LP/X3 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:Advanced modem/audio analog front-end
UCB-12 功能描述:斷路器 CIRCUIT BREAKER RoHS:否 制造商:Phoenix Contact 產(chǎn)品:Device Circuit Breakers 產(chǎn)品類(lèi)型:Thermomagnetic 電流額定值:2 A 電壓額定值 AC:240 V, 277 V 電壓額定值 DC:50 V 極數(shù):1 Pole 執(zhí)行器類(lèi)型:Slide 電路功能:Trip Free 系列:CB TM1 工作溫度范圍:- 30 C to + 60 C 照明:No
UCB1200 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:Advanced modem/audio analog front-end
UCB1200B 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:UCB1200B
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