TLFD500 datasheet(18/38 Pages) TI1

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TLFD500PN

3.3 V INTEGRATED G.LITE ANALOG FRONT END

SLAS207B – JUNE 1999 – REVISED MAY 2000

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

PCR-RX2 – programmable gain control register 2 for RX channel PGA1 and PGA2

Address: 00011b

Contents at reset: 00000000b

Reserved

RXPGA2[1]

RXPGA2[0]

RXPGA1[2]

RXPGA1[1]

RXPGA1[0]

Table 5. PCR-RX2 Gain

HEX VALUE

BIT NAME

DESCRIPTION

–

Reserved

Bit reserved for future use

–

Reserved

Bit reserved for future use

–

Reserved

Bit reserved for future use

–

0x00

RXPGA2[1:0]

0dB

–

0x08

6dB

–

0x10

12dB

–

0x18

18dB

–

0x00

RXPGA1[2:0]

0dB

–

0x01

3dB

–

0x02

6dB

–

0x03

9dB

–

0x04

12dB

–

0x05

INVALID

–

0x06

INVALID

–

0x07

INVALID

NOTES:

3. The formula to convert bit value to RXPGA2 gain in dB is

RXPGA2 gain (in dB) = RXPGA2[1:0] (in decimal) x 6dB

Similarly the needed RXPGA2[1:0] bit combination can be computed, given the gain in dB.

4. The formula to convert bit value to RXPGA1 gain in dB is

RXPGA1 gain (in dB) = RXPGA1[2:0] (in decimal) x 3dB

Similarly the needed RXPGA1[2:0] bit combination can be computed, given the gain in dB.

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.

PCR-TX – programmable attenuation control register for TX channel

Address: 00100b

Contents at reset: 00000000b

Reserved

TXPAA[4]

TXPAA[3]

TXPAA[2]

TXPAA[1]

TXPAA[0]

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