TLFD600 Datasheet, PDF (25/37 Pages) Texas Instruments – ADSL CODEC WITH INTEGRATED LINE DRIVER AND RECEIVER

TLFD600
ADSL CODEC WITH INTEGRATED LINE DRIVER AND RECEIVER
SLAS280B – MAY 2000 – REVISED NOVEMBER 2000
PROGRAMMING INFORMATION
PCR-RX2 – programmable gain control register 2 for RX channel
Address: 00011b
D7
D6
RXPGA2[3] RXPGA2[2]
Contents at reset: 00001011b
D5
D4
D3
RXPGA2[1]
RXPGA2[0] RXCPGA1[3]
D2
RXCPGA1[2]
D1
RXCPGA1[1]
D0
RXCPGA1[0]
Table 7. PCR-RX2 Gain Table
BIT NAME
D7 D6 D5 D4 D3 D2 D1 D0
DESCRIPTION
RXPGA2[3]
RXPGA2[2]
RXPGA2[1]
RXPGA2[0]
0
0
0
0
RX PGA2 = 0 dB
0
0
0
1
RX PGA2 = 3 dB
0
0
1
0
RX PGA2 = 6 dB
0
0
1
1
RX PGA2 = 9 dB
0
1
0
0
RX PGA2 = 12 dB
0
1
0
1
RX PGA2 = 15 dB
0
1
1
0
RX PGA2 = 18 dB
0
1
1
1
RX PGA2 = 21 dB
1
0
0
0
RX PGA2 = 24 dB
1
0
0
1
RX PGA2 = 27 dB
1
0
1
0
RX PGA2 = 30 dB
–
–
–
–
See Note 6
RXCPGA1[3]
RXCPGA1[2]
RXCPGA1[1]
RXCPGA1[0]
0
0
0
0 RXCPGA = 9 dB
0
0
0
1 RXCPGA = 12 dB
0
0
1
0 RXCPGA = 15 dB
0
0
1
1 RXCPGA = 18 dB
0
1
0
0 RXCPGA = 21 dB
0
1
0
1 RXCPGA = 24 dB
0
1
1
0 RXCPGA = 27 dB
0
1
1
1 RXCPGA = 30 dB
1
0
0
0 Invalid
1
0
0
1 RXCPGA = 3 dB
1
0
1
0 RXCPGA = – 3 dB
1
0
1
1 RXCPGA = – 9 dB
–
–
–
– See Note 6
NOTE 6. Performance of the codec for invalid combination of bits is not guaranteed and such combinations should not be used.
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