TLFD500 Datasheet, PDF (19/38 Pages) Texas Instruments – 3.3 V INTEGRATED G.LITE ANALOG FRONT END

TLFD500PN
3.3 V INTEGRATED G.LITE ANALOG FRONT END
SLAS207B – JUNE 1999 – REVISED MAY 2000
PCR-TX – programmable attenuation control register for TX channel (continued)
Table 6. PCR-TX Attenuation
D7 D6 D5 D4 D3 D2 D1 D0 HEX VALUE
BIT NAME
R
–
–
–
–
–
–
–
–
Reserved
–
R
–
–
–
–
–
–
–
Reserved
–
–
R
–
–
–
–
–
–
Reserved
–
–
–
0
0
0
0
0
0x00
TXPAA[4:0]
–
–
–
0
0
0
0
1
0x01
–
–
–
0
0
0
1
0
0x02
–
–
–
0
0
0
1
1
0x03
–
–
–
0
0
1
0
0
0x04
–
–
–
0
0
1
0
1
0x05
–
–
–
0
0
1
1
0
0x06
–
–
–
0
0
1
1
1
0x07
–
–
–
0
1
0
0
0
0x08
–
–
–
0
1
0
0
1
0x09
–
–
–
0
1
0
1
0
0x0A
–
–
–
0
1
0
1
1
0x0B
–
–
–
0
1
1
0
0
0x0C
–
–
–
0
1
1
0
1
0x0D
–
–
–
0
1
1
1
0
0x0E
–
–
–
0
1
1
1
1
0x0F
–
–
–
1
0
0
0
0
0x10
–
–
–
1
0
0
0
1
0x11
–
–
–
1
0
0
1
0
0x12
–
–
–
1
0
0
1
1
0x13
–
–
–
1
0
1
0
0
0x14
–
–
–
1
0
1
0
1
0x15
–
–
–
1
0
1
1
0
0x16
–
–
–
1
0
1
1
1
0x17
–
–
–
1
1
0
0
0
0x18
–
–
–
1
1
0
0
1
0x19
–
–
–
1
1
0
1
0
0x1A
–
–
–
1
1
0
1
1
0x1B
–
–
–
1
1
1
0
0
0x1C
–
–
–
1
1
1
0
1
0x1D
–
–
–
1
1
1
1
0
0x1E
–
–
–
1
1
1
1
1
0x1F
NOTE 5: The formula to convert bit value to TXPAA attenuation in dB is
TXPAA attenuation (in dB) = TXPAA[4:0] (in decimal) x (–1)dB
Similarly one can compute the TXPAA[4:0] bit combination needed, given the attenuation in dB.
DESCRIPTION
Bit reserved for future use
Bit reserved for future use
Bit reserved for future use
–0 dB
–1 dB
–2 dB
–3 dB
–4 dB
–5 dB
–6 dB
–7 dB
–8 dB
–9 dB
–10 dB
–11 dB
–12 dB
–13 dB
–14 dB
–15 dB
–16 dB
–17 dB
–18 dB
–19 dB
–20 dB
–21 dB
–22 dB
–23 dB
–24 dB
INVALID
INVALID
INVALID
INVALID
INVALID
INVALID
INVALID
CAUTION:
Performance of the codec for invalid combination of bits is not guaranteed and such
combinations should not be used. The user should make no assumption that the code bits
will saturate to a maximum or minimum value or wrap around to a valid combination.
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