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TLC32044CFN Datasheet(PDF) 30 Page - Texas Instruments

Part No. TLC32044CFN
Description  VOICE-BAND ANALOG INTERFACE CIRCUITS
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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TLC32044CFN Datasheet(HTML) 30 Page - Texas Instruments

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TLC32044C, TLC32044E, TLC32044I, TLC32044M, TLC32045C, TLC32045I
VOICE-BAND ANALOG INTERFACE CIRCUITS
SLAS017F − MARCH 1988 − REVISED MAY 1995
30
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
correction results
Table 5 shows the optimum p values and the corresponding correction results for 8000-Hz and 9600-Hz
sampling rates.
Table 5. Optimum P Values
f (Hz)
ERROR (dB)
fs = 8000 Hz
p1 = − 0.14813
ERROR (dB)
fs = 9600 Hz
p1 = − 0.1307
f (Hz)
fs = 8000 Hz
p1 = − 0.14813
p2 = 0.9888
fs = 9600 Hz
p1 = − 0.1307
p2 = 0.9951
300
− 0.099
− 0.043
600
− 0.089
− 0.043
900
− 0.054
0
1200
− 0.002
0
1500
0.041
0
1800
0.079
0.043
2100
0.100
0.043
2400
0.091
0.043
2700
− 0.043
0
3000
− 0.102
− 0.043
TMS(SMJ)320 software requirements
The digital correction filter equation can be written in state variable form as follows:
Y = k1
× Y + k2 × U
where
k1 = p1
k2 = (1 − p1)
× p2
Y = filter state
U = next I/O sample
The coefficients k1 and k2 must be represented as 16-bit integers. The SACH instruction (with the proper shift)
yields the correct result. With the assumption that the TMS(SMJ)320 processor page pointer and memory
configuration are properly initialized, the equation can be executed in seven instructions or seven cycles with
the following program:
ZAC
LT K2
MPY U
LTA K1
MPY Y
APAC
SACH (dma), (shift)


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