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參數(shù)資料
| 型號： | TCM38C17 |
| 廠商： | Intersil Corporation |
| 英文描述： | () |
| 中文描述： | （） |
| 文件頁數(shù)： | 2/7頁 |
| 文件大?。?/td> | 106K |
| 代理商： | TCM38C17 |
4-2
Figure 3 shows the interface between one channel of the
TCM38C17 and the Intersil HC5503 SLIC.
The transhybrid circuit works due to the inversion of the
signal from the receive port to the transmit port. The voltage
at R
X
is negative of the TX, so if the currents at the two ports
are the same, then the input signal could be removed from
the output signal. The resistors R
1
and R
2
can be changed
to adjust the gain, which is given by the following equation:
The input and output gain adjustment are discussed in detail
in PCM CODEC/Filter Combo Family: Device Design-In and
Application Data.[2] Figure 3 shows the TCM38C17’s output
used in the single-ended configuration. The analog input
gain can be fixed simply by using the feedback loop through
GSX. The AREF pin provides a reference voltage of 2.375V
that is connected to ANLGIN+ for bias.
Using the configuration in Figure 3, the transhybrid loss was
calculated, using the formula: transhybrid loss = 20 x log
(V
O
/1V
RMS
), where V
O
is the voltage at test point 3. The
data was gathered by measuring the output at different
frequencies in the voice band range. A 1V
RMS
signal was
applied at test point 2. The results are given in Table 1.
Without the transhybrid circuitry, the signal that is fed into the
receive pin of the SLIC appears at the transmit pin. To check
the whole loop, a 1kHz, 1V
RMS
signal was applied at the
receive pin of the SLIC and the transhybrid circuit was
removed. The signal appears at the transmit pin, which is
connected to the analog input of the TCM38C17; using
digital loop back, the analog output at the PWRO+ pin was
observed. This configuration is shown in Figure 4.
The scope plot for the setup in Figure 4 at test point 2 is
given in Figure 5. To make a comparison, the input signal
scope plot and its FFT are provided in the Appendix in
Figure A-1. Also in the Appendix (in Figure A-2), is the signal
at the PWRO+ pin and its FFT, with a 1V
RMS
signal at the
analog input with unity gain setting, and with PCMIN
connected to PCMOUT. So Figure A-2 gives the output
signal using digital loopback. The Appendix also provides a
description on how to read the scope plots.
To test the whole system with the transhybrid balance
included, the following configuration was also tested.
FIGURE 2. TEST SETUP
PWRO+
ANLGIN-
TCM38C17
TEST BOARD
SLIC
EVALUATION
BOARD
V
RX
V
TX
TRANSHYBRID
CIRCUITRY
1
2
3
FIGURE 3. QCOMBO INTERFACE TO THE INTERSIL 5503 SLIC
HC5503
RX
TX
PWRO+
GSR
PWRO-
GSX
ANLGIN-
ANLGIN+
AREF
TCM38C17
150k
200k
150k
24.9k
R
1
R
2
0.47 F
0.47 F
0.47 F
100nF
A
R
R
1
4
+
4 R
2
------
+
------------------------------
=
(EQ. 1)
TABLE 1. TRANSHYBRID LOSS CALCULATION FOR HC5503
FREQUENCY
(Hz)
TEST POINT 3
(V
AC
)
TRANSHYBRID
LOSS (dB)
400
0.026
-31.7
800
0.014
-37.1
1200
0.012
-38.4
1600
0.010
-40
2000
0.009
-40.9
2400
0.009
-40.9
2800
0.008
-41.9
3200
0.008
-41.9
3600
0.008
-41.9
FIGURE 4. TEST SETUP WITHOUT TRANSHYBRID CIRCUIT
PWRO+
ANLGIN-
TCM38C17
TEST BOARD
SLIC
EVALUATION
BOARD
V
RX
V
TX
PCMIN
PCMOUT
1
2
Application Note 9852
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