73K224BL-IH データシートの表示（PDF） - Teridian Semiconductor Corporation

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73K224BL-IH

V.22bis, V.22, V.21, Bell 212A, 103 Single-Chip Modem w/ Integrated Hybrid

Teridian Semiconductor Corporation 

73K224BL

V.22bis, V.22, V.21, Bell 212A, 103

Single-Chip Modem w/ Integrated Hybrid

DATA SHEET

CONTROL REGISTER 3

CR3

ADDR

101

D7

TXDALT

D6

TRI-STATE

TX/RXCLK

BIT

NAME

D3, D2,

D1,D0

Transmit

Attenuator

D4

Receive Gain

Boost

D5

OH

D6

Tri-state

TXCLK/RXCLK

D7

TXDALT

D5

D4

D3

D2

D1

D0

OH

RECEIVE TRANSMIT TRANSMIT TRANSMIT TRANSMIT

BOOST

ATTEN. 3

ATEN 2

ATTEN. 1

ATTEN. 0

ENABLE

CONDITION DESCRIPTION

D3 D2 D1 D0

0 0 0 0 Sets the attenuation level of the transmitted signal in 1 dB

1 1 1 1 steps. The default (D3 - D0 = 0100) is for a transmit level

of -10 dBm0 on the line with the recommended hybrid

transmit gain. The total range is 16 dB.

0

18 dB receive front end boost is not used.

1

Boost is in the path. This boost does not change reference

levels. It is used to extend dynamic range by compensating

for internally generated noise when receiving weak signals.

The receive level detect signal and knowledge of the hybrid

and transmit attenuator setting will determine when boost

should be enabled.

0

Relay driver open.

1

Open drain driver pulling low.

0

TXCLK and RXCLK are driven.

1

TXCLK and RXCLK are tri-stated.

Special Register Alternate TX data source (see Special Register).

Bit D3=1

Page: 18 of 33

© 2005, 2008 TERIDIAN Semiconductor Corporation

Rev 7.1

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