TS7514CP 查看數據表（PDF） - STMicroelectronics

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TS7514CP

PROGRAMMABLE V.23 MODEM WITH DTMF

STMicroelectronics 

Receive Filter Transfer Characteristics

Figure 7a : Main Channel

0

-10

-20

-30

-40

-50

-60

-70

0.1

1

10

100

FREQUENCY (kHz)

Figure 7b : Back Channel - Narrow Band

0

-10

-20

-30

-40

-50

-60

-70

0.1

1

10

10 0

FRE QUENCY (kHz)

Figure 7c : Basic Channel

Wide band and Tone Detection

0

-10

-20

-30

-40

-50

-60

-70

0.1

1

10

10 0

FRE QUENCY (kHz)

TS7514

Transmission Spectrum

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

conforms to the following specifications :

0dB

25dB

55dB

f(kHz)

3.4 4

16

200

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)

Line 1

Line 2

Line 3

Line 4

S/N

6 dB

7 dB

8 dB

7 dB

BER

2.10 –3

2.10 –3

2.10 –3

2.10 –3

S/N

– 3 dB

– 3 dB

– 3 dB

– 3 dB

BER

2.10 –3

2.10 –3

2.10 –3

2.10 –3

15/19

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