TRF2443IPFPR datasheet(44/72 Pages) TI

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TRF2443

SLWS217A – SEPTEMBER 2009 – REVISED SEPTEMBER 2009 ................................................................................................................................... www.ti.com

LNA_ATT<4,0>: RX LNA attenuation setting. The LNA has 19 dB of gain range in 1-dB steps, as shown in

Table 6.

Table 6. LNA Attenuation and Gain vs LNA_ATT<4,0>

LNA_ATT<4,0>

LNA ATTENUATION (dB)

LNA GAIN (dB)

<0 0000>

<00001>

<0 0010>

<0 0011>

<0 0100>

<0 0101>

<0 0110>

<0 0111>

<0 1000>

<0 1001>

<0 1010>

<0 1011>

<0 1100>

<0 1101>

<0 1110>

<0 1111>

<1 0000>

<1 0001>

<1 0010>

–1

<1 0011>

–2

EN_SAW (bit 10): It enables the external IF path (through the SAW filter) for the signal. When it is 1, the IFVGA1

output buffer (pins 2 and 3) and IFVGA2 input buffer (pins 62 and 63) are on, and the internal connection

between the two VGAs is off (see Figure 101).

RXBB_GAIN<4,0>: RX baseband-amplifier gain setting. There are 25 gain settings (0 to 24) in 1-dB increments.

<1 1000> = maximum gain (33 dB). To set a new gain, the following formula can be used:

gain_setting = wanted_gain – 9.

Example: Wanted gain = 22 dB

→ New gain setting = 22 – 9 = 13 = <0 1101>

RXBB_FREQ<6,0>: RX baseband-filter cutoff-frequency control. All 1s sets the filter to its minimum pass band;

whereas all 0s sets the filter to its maximum cutoff frequency.

PWD_RX (bit 25): When it is 1, the entire RX chain is off.

PWD_XPIC (bit 26): When it is 1, XPIC (RX chain and output amplifier) is off.

XPICBB_GAIN<4,0>: XPIC baseband-amplifier gain setting. There are 13 gain settings (0 to 12) in 1-dB

increments; <0 0000> = minimum gain (9 dB) and <0 1100> = maximum gain (21 dB). To set a new gain, the

following formula can be used:

gain_setting = wanted_gain – 9.

Example: Wanted gain = 12 dB

→ New gain setting = 12 – 9 = 3 = <0 0011>

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