參數(shù)資料
型號(hào): PEB80900H
英文描述: ?Network Termination Controller?
中文描述: ?網(wǎng)絡(luò)終端控制器?
文件頁(yè)數(shù): 58/181頁(yè)
文件大?。?/td> 3288K
代理商: PEB80900H
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PEB 80900
Part I
NTC-T
: Functional Description
Data Sheet
46
2001-04-02
Furthermore it contains some special functions. These are:
Analog test loop-back
Level detect function
Analog-to-Digital Converter
The ADC is a sigma-delta modulator of second order using a clock rate of 15.36 MHz.
The peak input signal measured between AIN and BIN must be below 4 Vpp. In case the
signal input is too low (long range), the received signal is amplified internally by 6 dB.
The maximum signal to noise ratio is achieved with 1.3 Vpp (long range) and 2.6 Vpp
(short range) input signal voltage.
Digital-to-Analog Converter
The output pulse is shaped by a special DAC. The DAC was optimized for excellent
matching between positive and negative pulses and high linearity. It uses a fully
differential capacitor approach. The staircase-like output signal of the DAC drives the
output buffers. The shape of a DAC-output signal is shown in
Figure 20
, the peak
amplitude is normalized to one. This signal is fed to an RC-lowpass filter of the first order
with a corner frequency of 1 MHz
±
50%.
The duration of each pulse is 11 steps, with
T0
= 1/960 ms per step. On the other hand,
the pulse rate is 120-kHz or one pulse per 8 steps. Thus, the subsequent pulses are
overlapping for a duration of 3 steps.
Figure 20
DAC Output for a Single Pulse
ITD09869
t = 0
1
2
3
4
5
6
7
8
9
10
11 * T0
0.25
0.5
0.75
0.25
0.5
0.75
1.0
T0 = 1/960 ms
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