TS7514 datasheet(15/19 Pages) STMICROELECTRONICS

15 / 19 page

Transmission Spectrum

At the ATO output, the out-of-band signal power

conforms to the following specifications :

Receiver

Measurement conditions

Local transmit level : -10dBm on lower channel at

75bps.

Receive level : -25dBm, with 511 bit pseudo-ran-

dom test pattern.

Test equipment : TRT sematest.

Isochronous distortion

The following table shows typical isochronous dis-

tortion obtained with the TS7514 circuit :

Line

Reception (1200)

Reception (75)

Line 1 (fiat)

10 %

4 %

Line 2

12 %

4 %

Line 3

18 %

6 %

Line 4

14 %

6 %

Bit error rate

Typical bit error rates versus while noise are as

follows (noise and signal levels are measured with-

out weighting on the 300/3400Hz) :

Reception (1200)

Reception (75)

S/N

BER

S/N

BER

Line 1

6 dB

2.10

–3

– 3 dB

2.10

–3

Line 2

7 dB

2.10

–3

– 3 dB

2.10

–3

Line 3

8 dB

2.10

–3

– 3 dB

2.10

–3

Line 4

7 dB

2.10

–3

– 3 dB

2.10

–3

0dB

25dB

55dB

200

3.4

f(kHz)

Receive Filter Transfer Characteristics

0.1

100

-10

-20

-30

-40

-50

-60

-70

FREQUENCY (kHz)

Figure 7a : Main Channel

0.1

10 0

-10

-20

-30

-40

-50

-60

-70

FRE QUENCY ( kHz)

Figure 7b : Back Channel - Narrow Band

0.1

10 0

-10

-20

-30

-40

-50

-60

-70

FRE QUENCY ( kHz)

Figure 7c : Basic Channel

Wide band and Tone Detection

TS7514

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