1996 Nov 21

20

Philips Semiconductors

Product specification

DTMF/modem/musical-tone generators

PCD3311C; PCD3312C

Fig.20 DTMF output voltage levels as a function of

handbook, halfpage

02

46

−11

−12

−14

−15

−13

MGG518

VDD (V)

VTONE

(dBm)

Tamb =

−25 ˚C

+25 ˚C

+70 ˚C

−25 ˚C

+25 ˚C

+70 ˚C

HIGH GROUP

LOW GROUP

Fig.21 Dual tone output voltage level as a function

of output load resistance.

handbook, halfpage

0.4

−0.8

−0.4

0

MGG519

VTONE

(dB)

RL (Ω)

Tamb =

−25 ˚C

+25 ˚C

+70 ˚C

handbook, full pagewidth

MGG520

01

2

3

4

5

−100

−80

−60

−40

−20

0

level

(dBm)

frequency (kHz)

CS203

handbook, full pagewidth

MGG521

010

20

30

40

50

−100

−80

−60

−40

−20

0

level

(dBm)

frequency (kHz)

CS203

Fig.22 Typical frequency spectrum of a dual tone signal after flat-band amplification of 6 dB.