參數(shù)資料
型號： STLC7545
廠商： 意法半導體
英文描述： Enhanced V.34 BIS Analog Front-End(單片模擬前端)
中文描述： 國際清算銀行增強.34模擬前端（單片模擬前端）
文件頁數(shù)： 46/53頁
文件大?。?/td> 378K
代理商： STLC7545
IX - RECEIVE CHARACTERISTICS
IX.1- TESTCONDITIONS
The Rx characteristics depend on the transferfunction of the receive filter. The indicated performanceis
measuredwhen IIR2 filter implements the 6th order band-passtransferfunction shown in Figure 14. This
is achievedby loadingthe coefficientsgiven in Table 50.
7
Figure 14 :
Filter Transfer Function
(Sampling frequency = 48000Hz, Fsx = 9600Hz,Sample of group delay = 1/5 x Fsx)
Table 50 :
DecimatorFilter Coefficients
WORD
7200,9600
1
0000,0000
2
0000,0000
3
a000,a000
4
0000,0000
5
0000,0000
6
0000,0000
7
0000,0000
8
20f8,3208
WORD
9
10
11
12
13
14
15
16
7200,9600
0000,e000
e000,0000
b2c0,bf38
5998,4188
12c8,0188
4c80,e000
a000,0000
a5e0,b8e0
WORD
17
18
19
20
21
22
23
24
7200,9600
4d90,4250
25b8,2890
d1b0,ca18
a000,a000
b1f8,b748
4668,47a8
1408,1b98
de78,cc80
WORD
25
26
27
28
29
30
31
32
7200,9600
a000,a000
ab60,b5b0
5a40,4e88
09b8,23c8
2c30,d620
a000,a000
a088,b470
6a30,5468
WORD
33
34
35
36
37
38
-
-
7200,9600
0d38,0618
0000,1a38
a000,a000
0000,0000
0000,0000
0008,0008
-
-
Filter coefficients (HEX FORMAT) for Fsx equal to 7200 AND 9600Hz respectively
IX.2- PERFORMANCE OF THE Rx CHAIN
(from(RxA1-RxA2) input to IIR2 filter output)
Typicalvalues are givenfor V
DD
= +5V , T
amb
= 25
o
C and for nominal crystalfrequencyFQ=36.864MHz.
Measurementband = 300Hzto 3.4kHz- Tx DPLL freerunning.
Table 51:
Performanceof the Rx chain
Symbol
Gabs
THD
Parameter
Min
-0.5
Typ
0
Max
0.5
Unit
dB
Absolute gain at 1 kHz
Total harmonic distortion
(differential Rx signal : V
IN
= 1.6 V
PP
, f = 1kHz, OverSampling ratio 160)
Fsx = 7200 Hz
Fsx = 9600 Hz
Fsx = 7200 Hz
Fsx = 9600 Hz
-89
-89
91
92
50
95
dB
dB
dB
dB
dB
dB
DR
Dynamic range (1) f = 1kHz, OverSampling ratio 160
PSRR
CTxRx
Power supply rejection ratio (f = 1kHz, V
AC
= 200mV
PP
)
Crosstalk (receive channel to transmit channel)
Note 1 :
Measuredover the full 0 to Fsx/2 with a -10dBr input and extrapolatedto fullscale
STLC7545
46/53
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