參數(shù)資料
型號(hào)： STLC7545
廠商： 意法半導(dǎo)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(qiáng).34模擬前端（單片模擬前端）
文件頁數(shù)： 45/53頁
文件大?。?/td> 378K
代理商： STLC7545
7
Figure 13 :
Filter Transfer Function
(Samplingfrequency = 48000Hz, Fsx = 9600Hz, Sample of group delay = 1/5 x Fsx)
VIII - TRANSMITCHARACTERISTICS
VIII.1 - TESTCONDITIONS
The Tx characteristics depend on the transferfunction of the transmit filter. The indicated performanceis
measuredwhen IIR1 filterimplementsthe 8th orderlow-passtransferfunction(including sinx/x correction)
shownin Figure13. This is achievedby loadingthe coefficientsgiven in table48.
The frequencyresponse in Figure13 includesthe gain of 72.25dBin front of the biquad 1 (seeFigure A1)
Table 48 :
InterpolatorFilter Coefficients
WORD
7200,9600
1
0000,0000
2
0000,0000
3
a000,a000
4
0000,0000
5
0000,0000
6
0000,b7d8
7
0000,42b0
8
a000,0118
WORD
9
10
11
12
13
14
15
16
7200,9600
0000,ca08
0000,a000
b368,b570
4400,48a0
0200,2838
d330,cb68
a000,a000
b118,b268
WORD
17
18
19
20
21
22
23
24
7200,9600
4c98,5070
2438,3508
d7a8,cfa0
a000,a000
af18,aed8
5690,59d0
2118,2898
4f80,dd90
WORD
25
26
27
28
29
30
31
32
7200,9600
a000,a000
adb8,ac18
5e70,6118
0748,07a0
a280,3368
a000,a000
a910,adf0
5120,5338
WORD
33
34
35
36
37
38
-
-
7200,9600
0750,0858
6aa8,4098
a000,a000
0000,0000
0000,0000
0008,0008
-
-
Filter coefficients (HEX FORMAT) for Fsx equal to 7200 and 9600Hz respectively
VIII.2 - PERFORMANCEOF THETx CHAIN
(fromIIR1 filter input to (TxA1-TxA2) output)
Typicalvaluesare given for V
DD
= +5V, T
amb
= 25
o
C and fornominal crystal frequencyFQ = 36.864MHz.
Measurementband = 300Hzto 3.4kHz- Tx DPLL freerunning.
Table 49 :
Performanceof the Tx chain
Symbol
Parameter
Gabs
Absolute gain at 1kHz
THD
Total harmonic distortion
(differential Tx signal : V
OUT
= 1.6V
PP
, f = 1kHz, OverSampling ratio 160)
Min
-0.5
Typ
0
Max
0.5
Unit
dB
Fsx = 7200Hz
Fsx = 9600Hz
Fsx = 7200Hz
Fsx = 9600Hz
-89
-89
91
92
50
95
dB
dB
dB
dB
dB
dB
DR
Dynamic range (1) (f= 1kHz, OverSamplingratio 160)
PSRR
CTxRx
Power supply rejection ratio (f = 1kHz, V
AC
= 200mV
PP
)
Crosstalk (transmit channel to receive channel)
Note 1 :
Measuredover the full 0 to Fsx/2 with a -10dBr input and extrapolatedto fullscale
VIII.3 - SMOOTHINGFILTER TRANSFER CHARACTERISTICS
The cut-off frequencyof thesingle pole switch-capacitor low-passfilter followingthe DAC (Figure1) is :
fc-3dB=128*Fsx/(2*
π
*10) or fc-3dB= 160*Fsx/(2*
π
*10)
STLC7545
45/53
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