73k224bl ETC-unknow, 73k224bl Datasheet - Page 18

• Manufacturer Part Number: 73k224bl
• Description: Single-chip Modem Integrated Hybrid
• Manufacturer: ETC-unknow

73K224BL
V.22bis/V.22/V.21/Bell 212A/103
Single-Chip Modem w/ Integrated Hybrid
CONTROL REGISTER 3
ADDR
BIT
D3, D2,
D1,D0
D4
D5
D6
D7
CR3
101
TXDALT
D7
TXCLK/RXCLK
Receive Gain
Attenuator
Transmit
TXDALT
Tri-state
NAME
Boost
TRI-STATE
TX/RXCLK
OH
D6
D3 D2 D1 D0
0
1
Special Register
OH
D5
CONDITION
Bit D3=1
0
1
0
1
0
1
0
1
RECEIVE
0
1
ENABLE
BOOST
D4
0
1
18
DESCRIPTION
Sets the attenuation level of the transmitted signal in 1
dB 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.
18 dB receive front end boost is not used.
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.
Relay driver open.
Open drain driver pulling low.
TXCLK and RXCLK are driven.
TXCLK and RXCLK are tri-stated.
Alternate TX data source (see Special Register).
TRANSMIT
ATTEN. 3
D3
TRANSMIT
ATEN 2
D2
TRANSMIT
ATTEN. 1
D1
TRANSMIT
ATTEN. 0
D0