CMX635 Просмотр технического описания (PDF) - CML Microsystems Plc

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CMX635

ISDN Subscriber Processor

CML Microsystems Plc 

ISDN Subscriber Processor

CMX635

1.2.2 Analogue Block Diagram

RX1O

RX1P

RX1N

RX2O

RX2P

RX2N

TX1OP

TX1N

TX1ON

TX1O

Data G1

F1 (+3.9db)

T1

S1

A

Data G5

Sidetone

-3db

Voice

S2

Tone S3

Voice

S4

S7

T2

G2 Data

S8

IS1

DTMF

DECODE

Data

AMPLITUDE Data

STATS

TX

CODEC

B Chan Tx DAT

B

F2 (-3.9dB)

RX

CODEC

B Chan Rx DAT

FSK

UART

Data

AMPLITUDE Data

STATS

TX2O

TX2ON

SPM

Tone

S5

TONE

GENERATOR Data

Data G3 Ring

Data G4

S6

RING

GENERATOR Data

SPM

GENERATOR

Notes:

G1 =

G2 =

G3 =

G4 =

G5 =

Data

Gx = Programmable Gain

Sx = User Switch

ISx = Internal Switch

Fx = Filter

Tx = Test Switch

0dB to 22.5dB ( in 1.5db steps)

-

Level set/AGC gain.

0dB to –42dB (in 3dB steps + mute) - Speakerphone attenuation.

+6dB to –42dB (in 0.5dB steps + mute) -

Speaker/ring output gain.

0dB to –42dB (in 3dB steps + mute) - Tone gain

-6dB to –36dB (in 2dB steps) -

Sidetone gain.

S1 – S8

=

User selectable switches.

IS1

=

Internally operated switches (shown for information only).

T1 - T2

=

Test Switches (shown for information only).

At reference points “A” and “B” the nominal signal level scaling as defined in ITU-T G714 is:

0dbm0 ≡ 0dBm = 775 mV r.m.s. at 5V power supply.

The maximum unclipped sine wave possible on reference points “A” and “B” is:

3.14dbm0 ≡ 3.14dBm = 1.11 V r.m.s. for A law companding at 5 V supply.

Peak to peak full scale input signal to Rx Codec is 0.986 x VDD for A-law companding,

And 0.989 x VDD for µ-law companding.

Figure 2.

ANALOGUE BLOCK DIAGRAM

© 2001 Consumer Microcircuits Limited

5

D/635/2

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