CMX264D5 Просмотр технического описания (PDF) - CML Microcircuits

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CMX264D5

Frequency Domain Split Band Scrambler

CML Microcircuits 

Frequency Domain Split Band Scrambler

1.3 Signal List

Package

D5

Signal

Pin No.

Name

1

-

2

-

3

XTAL

4

XTALN

5

-

6

MICO

7

-

8

VBIAS

9

-

10

-

11

MICIN

12

VSS

13

-

14

RXIN

CMX264

Description

Type

-

This pin should be left unconnected.

-

This pin should be left unconnected.

I/P A 4.433619MHz crystal is connected to these

O/P pins with the appropriate external components

(see Figure 2).

Alternatively, an externally derived clock signal

may be applied to the XTAL pin. In this case,

the XTALN pin should be left unconnected.

-

This pin should be left unconnected.

O/P The Tx audio output from the scrambler. This

signal may be scrambled or clear. If scrambled

it may come from the variable split-band (VSB)

scrambler direct or via the Tx de-emphasis

block. All signal paths depend upon the internal

state selected.

-

This pin should be left unconnected.

O/P A bias line for the internal circuitry, internally

held at ½VDD. This pin must be decoupled to

VSS by a capacitor mounted close to the device

pins.

-

This pin should be left unconnected.

-

This pin should be left unconnected.

I/P The input for the signal from the microphone

amplifier/limiter. This pin may be the input to the

Tx pre-emphasis circuit, the VSB scrambler or

the clear path, depending upon the internal state

selected.

Power The negative supply rail (ground)

-

This pin should be left unconnected.

I/P The input for the received audio signal, whether

scrambled or clear. This pin may be routed to

the Rx pre-emphasis circuit, the flatband

frequency descrambler or the clear path,

according to the internal state selected via the

serial interface.

© 1999 Consumer Microcircuits Limited

4

D/CMX264/1

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