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| NS32FX100-15 Datasheet, PDF (92/94 Pages) National Semiconductor (TI) – System Controller | |||
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Appendix A Codec Transmission Performance
The Sigma Delta Codec transmission performance of a typi-
cal complete system including DAA is according to the fol-
lowing test conditions
canceling filter is disabled The transmission absolute accu-
racy is measured after auto-calibration of the measuring cir-
cuit
The measurement analog circuit is according to Figure 2-5
The measurements are performed on the line with 600X
termination The transmit and receive gains are pro-
grammed for amplification attenuation of 0 dB The Echo-
Electrical test conditions
TA e 25 C
Digital Supplies VCCD e 5V g10% GND e 0V
Analog Supplies VCCA e g5V g5%
VEE e g12V g10%
TABLE A-1 Transmitter Performance
Parameter
Conditions
Min
Typ
Tx Peak Level
b2 1
Maximum Level
tx a3 14 dbmo
a6 00
Transmit Gain
Absolute Accuracy
b0 5
Transmit Gain
Variation with Frequency
300 Hz
500 Hz â 3000 Hz
b0 5
b0 3
3400 Hz
b2 0
3900 Hz
Transmit Noise
Psofometric Weighted
b88
Spurious Out of Band
5 1 kHz â 7 2 kHz
7 2 kHz â 20 kHz
20 kHz â 100 kHz
Signal to Total Distortion
Level e3 dbmo 40
Half Channel Sine Method
(without transformer
distortion)
b10 dbmo 67
69
(b18) 0 dbmo 60
(b38) (b18)dbmo 40
b45 dbmo 32
Max
a2 1
a0 5
a0 5
a0 3
a0 0
b12
b85
b45
b60
b65
Unit
V
dbm
db
db
db
db
db
dbmPo
db
db
db
dbP
dbP
dbP
dbP
dbP
92
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