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TRF2443IPFPR Datasheet(PDF) 43 Page - Texas Instruments |
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TRF2443IPFPR Datasheet(HTML) 43 Page - Texas Instruments |
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43 / 72 page  TRF2443 www.ti.com ................................................................................................................................... SLWS217A – SEPTEMBER 2009 – REVISED SEPTEMBER 2009 EN_LB (bit 18): When 1, the loopback switch, connecting the TX mixer output to the RX IFVGA3 input, is on. Also, when the switch is enabled, the TX amplifier, RX LNA, IFVGA1, and IFVGA2 are turned off (see the Application Information section). EN_LB_ATT (bit 19): When 1, a 20-dB attenuator in the loopback path is enabled (see the Application Information section). DET_RESET (bit 20): Set this bit to 1 to reset the power-alarm output after it has gone low for a power-alarm alert (see the Application Information section). SPI3 Register 2 Enable Register address SPI address RX LNA gain control RX baseband gain ext SAW Bit0 Bit1 Bit2 Bit3 Bit4 Bit5 Bit6 Bit7 Bit8 Bit9 Bit10 Bit11 Bit12 Bit13 Bit14 Bit15 Baseband Filter PWD PWD RX baseband-filter corner frequency 3-dB XPIC baseband gain bypass RX XPIC attenuation Bit16 Bit17 Bit18 Bit19 Bit20 Bit21 Bit22 Bit23 Bit24 Bit25 Bit26 Bit27 Bit28 Bit29 Bit30 Bit31 REGISTER POWER-ON SUGGESTED DESCRIPTION NAME 2 VALUE VALUE Bit0 ADDR_0 0 0 Register address bits Bit1 ADDR_1 1 1 Bit2 ADDR_2 0 0 Bit3 ADDR_3 1 1 SPI address bits Bit4 ADDR_4 1 1 Bit5 LNA_ATT_0 0 App. specific RX LNA attenuation control bits <0 0000> corresponds to 0-dB attenuation (maximum gain). Bit6 LNA_ATT_1 0 App. specific <1 0011> corresponds to 19-dB attenuation (minimum gain). Bit7 LNA_ATT_2 0 App. specific Gain step is 1 dB. Bit8 LNA_ATT_3 0 App. specific Bit9 LNA_ATT_4 0 App. specific Bit10 EN_SAW 0 App. specific 1 = signal path through external SAW filter enabled Bit11 RXBB_GAIN_0 0 App. specific RX baseband amplifier gain setting <1 1000> = maximum gain (33 dB); gain step is 1 dB. Bit12 RXBB_GAIN_1 0 App. specific RXBB_GAIN<4,0> = wanted gain – 9 Bit13 RXBB_GAIN_2 0 App. specific Example: wanted gain = 22 dB → New gain setting = 22 – 9 = 13 = Bit14 RXBB_GAIN_3 0 App. specific <0 1101> Bit15 RXBB_GAIN_4 1 App. specific Bit16 RXBB_FREQ_0 0 App. specific RX baseband-filter cutoff-frequency setting Setting of <111 1111> corresponds to minimum cutoff frequency. Bit17 RXBB_FREQ_1 1 App. specific See the Baseband-Filter Cutoff-Frequency Calibration section. Bit18 RXBB_FREQ_2 1 App. specific Bit19 RXBB_FREQ_3 1 App. specific Bit20 RXBB_FREQ_4 1 App. specific Bit21 RXBB_FREQ_5 0 App. specific Bit22 RXBB_FREQ_6 1 App. specific Bit23 RXBB_FLT_BYP 0 App. specific RX baseband filter bypass Bit24 RXBB_3dBATT 1 App. specific Enable 3-dB attenuator in the RX BB output buffer (1 = on) Bit25 PWD_RX 0 0 Power down receiver chain Bit26 PWD_XPIC 0 0 Power down XPIC Bit27 XPICBB_GAIN_0 0 App. specific XPIC baseband-amplifier gain setting. <xxx> = maximum gain (xx dB); gain step is 1 dB. Bit28 XPICBB_GAIN_1 1 App. specific XPICBB_GAIN<4,0> = wanted gain – 9 Bit29 XPICBB_GAIN_2 1 App. specific Example: wanted gain = 12 dB → New gain setting = 12 – 9 = 3 = <0 0011> Bit30 XPICBB_GAIN_3 0 App. specific Bit31 XPICBB_GAIN_4 0 App. specific Copyright © 2009, Texas Instruments Incorporated Submit Documentation Feedback 43 Product Folder Link(s): TRF2443 |
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