CMX649 Просмотр технического описания (PDF) - CML Microsystems Plc

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CMX649

ADM Codec

CML Microsystems Plc 

ADM Codec

CMX649

REGISTER

NAME

ENCODE

OFFSET LEVEL

OUTPUT (1)

HEX

ADDRESS/

COMMAN

D

$E5

BIT 7

(D7)

(2)

ENCODE

LINEAR PCM

$E6

OUTPUT (1)

(2)

ENCODE ADM

OUTPUT

$EA

BIT 6

(D6)

BIT 5

(D5)

BIT 4

(D4)

BIT3

(D3)

BIT 2

(D2)

Offset Level Output Bits 15 - 8

Offset Level Output Bits 7 - 0

Linear PCM Output Signal Bits 15 - 8

Linear PCM Output Signal Bits 7 - 0

Encode ADM Output

BIT 1

(D1)

BIT 0

(D0)

5.2.1 Write Only Register Description

GENERAL RESET ($01)

The reset command has no data attached to it. Application of the GENERAL RESET sets all write only

register bits to 0.

AAF/AIF BANDWIDTH Register ($61)

AAF Bypass

(Bit 7)

AAF Bandwidth

(Bits 6 – 4)

When this bit is set to logic 1 the anti-alias filter is bypassed.

The –3dB cutoff frequency of the anti-alias filter is controlled by bits 4 – 6. The filter

shape is not altered other than to move the cutoff frequency.

Bit 6

0

0

0

0

1

1

Bit 5

0

0

1

1

0

0

Bit 4

0

1

0

1

0

1

-3dB Frequency

2.9kHz

3.7kHz

5.0kHz

7.0kHz

10.0kHz

14.0kHz

AIF Bypass

(Bit 3)

When this bit is set to a logic 1 the anti-image filter is bypassed.

AIF Bandwidth The –3dB cutoff frequency of the anti-image filter is controlled by bits 0-2. The filter

(Bits 2 – 0)

shape is not altered other than to move the cutoff frequency.

© 2003 CML Microsystems Plc

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