TLC32044C Datasheet, PDF (35/39 Pages) Texas Instruments – VOICE-BAND ANALOG INTERFACE CIRCUITS

TLC32044C, TLC32044E, TLC32044I, TLC32044M, TLC32045C, TLC32045I
VOICE-BAND ANALOG INTERFACE CIRCUITS
TYPICAL CHARACTERISTICS
SLAS017F – MARCH 1988 – REVISED MAY 1995
AIC RECEIVE CHANNEL
BANDPASS FILTER
Low-Pass SCF Clock f = 288 kHz
High-Pass SCF Clock f = 8 kHz
2.5
TA = 25°C
Input = ± 3-V Sine wave
2.0
1.5
1.0
0.5
0.0
0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
Frequency – kHz
Figure 16
AIC (sin x)/x CORRECTION FILTER
5
SCF Clock f = 288 kHz
4.5 TA = 25°C
Input = ± 3-V Sine wave
4
3.5
3
2.5
2
1.5
1
0.5
0
0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
SCF Clock Frequency
Normalized Frequency – kHz ×
288 kHz
Figure 17
AIC (sin x)/x CORRECTION FILTER
6
(sin x)/x
4
Correction
Filter
2
Error
0
–2
–4
D/A Converter (sin x)/x
Distortion for TB Register = 36
–6
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
SCF Clock Frequency
Normalized Frequency – kHz ×
288 kHz
Figure 18
A/D SIGNAL-TO-DISTORTION RATIO
vs
INPUT-SIGNAL LEVEL
100
1-kHz Input Signal
90 _{8-kHz Conversion Rate}
80
70
Gain = 4x
60
Gain = 1x
50
40
30
20
10
0
– 50 – 40 – 30 – 20 –10
0
10
Input Signal Relative to Vref – dB
Figure 19
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