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參數(shù)資料
| 型號(hào)： | TCM38C17 |
| 廠商： | Intersil Corporation |
| 英文描述： | () |
| 中文描述： | （） |
| 文件頁數(shù)： | 3/7頁 |
| 文件大?。?/td> | 106K |
| 代理商： | TCM38C17 |
4-3
.
In this case, a 1V
RMS
signal was applied to the microphone
of the telephone (test point 2) and the output was observed
at the speaker (test point 1); so the signal goes from the
SLIC to the TCM38C17 and back through the transhybrid
circuit. Figure 7 gives the scope plot showing the voltage at
test point 1.
TCM38C17 Interface to the HC5518 SLIC FAMILY
Figure 8 gives the interface between one channel of the
TCM38C17 and the Intersil HC5503 SLIC.
The same tests done for the HC5503 SLIC were carried out
for the HC5518 SLIC. The results, given in Table 2, are
based on a test setup similar to that given in Figure 2.
Using the HC5518 in the configuration shown in Figure 4,
the voltage at test point 2 is as follows:
For the complete system test using the HC5518, the results
are given in Figure 10.
FIGURE 5. SCOPE PLOT FOR THE CONFIGURATION IN
FIGURE 4
: 41.2dB
@: -50.4dB
M2 MAX
-6.0dB
M2 MIN
-82.2dB
CH2
500mV M 500
μ
s CH2
1.96V
C2 PK-PK
1.16V
FIGURE 6. TEST SETUP FOR THE COMPLETE SYSTEM
1
PWRO+
TCM38C17
TEST BOARD
ANLGIN-
CIRCUITRY
TRANS-
HYBRID
PCMIN
PCMOUT
SPEAKER
MIC
TELEPHONE
2
SLIC
EVALUATION
BOARD
V
RX
V
TX
FIGURE 7. SCOPE PLOT FOR THE CONFIGURATION IN
FIGURE 6
: 34.4dB
@: -14.4dB
C2 PK-PK
720mV
M2 MAX
5.2dB
CH2
2.00V M 1.00ms CH2
-8.52V
M2 MIN
-70.2dB
TABLE 2. TRANSHYBRID LOSS CALCULATION FOR HC5518
FREQUENCY
(Hz)
TEST POINT 3
(V
AC
)
TRANSHYBRID
LOSS (dB)
400
0.017
-35.4
800
0.010
-40
1200
0.012
-38.4
1600
0.016
-35.9
2000
0.02
-34
2400
0.023
-32.8
2800
0.026
-31.7
3200
0.029
-30.8
3600
0.031
-30.2
FIGURE 8. QCOMBO INTERFACE TO THE HC5503 SLIC
HC5518
RX
TX
PWRO+
GSR
PWRO-
GSX
ANLGIN-
ANLGIN+
AREF
TCM38C17
100k
44.2k
100k
R
1
R
2
0.47 F
0.47 F
0.47 F
100nF
FIGURE 9. SCOPE PLOT FOR THE CONFIGURATION IN
FIGURE 4, VOLTAGE AT TEST POINT 2
: 42.6dB
@: -47.6dB
M2 MAX
7.2dB
M2 MIN
-70.2dB
CH2
2.00V
M 500
μ
s CH2
2.20V
Application Note 9852
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