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TRF2443IPFPR Datasheet(PDF) 40 Page - Texas Instruments |
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TRF2443IPFPR Datasheet(HTML) 40 Page - Texas Instruments |
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40 / 72 page  TRF2443 SLWS217A – SEPTEMBER 2009 – REVISED SEPTEMBER 2009 ................................................................................................................................... www.ti.com SPI2 Register 5 Register address SPI address RXPLL BIAS RSV RSV RXVCO BIAS BUF1 BIAS Bit0 Bit1 Bit2 Bit3 Bit4 Bit5 Bit6 Bit7 Bit8 Bit9 Bit10 Bit11 Bit12 Bit13 Bit14 Bit15 BUF2 BIAS OUTBUF BIAS PRESC BIAS BIAS SEL VCO CAL REF RSV RSV RSV RSV RSV RSV Bit16 Bit17 Bit18 Bit19 Bit20 Bit21 Bit22 Bit23 Bit24 Bit25 Bit26 Bit27 Bit28 Bit29 Bit30 Bit31 REGISTER POWER-ON SUGGESTED NAME DESCRIPTION 5 VALUE VALUE Bit0 ADDR_0 1 1 Register address bits Bit1 ADDR_1 0 0 Bit2 ADDR_2 1 1 Bit3 ADDR_3 0 0 SPI address bits Bit4 ADDR_4 1 1 Bit5 RXPLL_BIAS_0 0 0 RX PLL reference-current control bits. Adjust reference current from 40 µA to 60 µA. Bit6 RXPLL_BIAS_1 0 0 Bit7 RXPLL_BIAS_2 1 1 Bit8 RSV 0 0 Reserved Bit9 RSV 0 0 Reserved Bit10 RXVCO_BIAS_0 0 1 RX VCO bias-control bits. VCO current can be changed from 10 mA (0000) to 25 mA (1111), 1-mA steps. Bit11 RXVCO_BIAS_1 0 1 Bit12 RXVCO_BIAS_2 0 1 Bit13 RXVCO_BIAS_3 1 1 Bit14 RXBUF1_BIAS_0 0 0 It sets the PLL buffer 1 bias from 0.8 mA (00) to 2 mA (11), 0.4-mA steps. Bit15 RXBUF1_BIAS_1 1 1 Bit16 RXBUF2_BIAS_0 0 0 It sets the PLL buffer 2 bias from 0.8 mA (00) to 2 mA (11), 0.4-mA steps. Bit17 RXBUF2_BIAS_1 1 1 Bit18 RXBUFOUT_BIAS_0 0 0 RXPLL output-buffer reference bias current. 200 µA (00) to 500 µA (11) Bit19 RXBUFOUT_BIAS_1 1 1 Bit20 RXPRES_BIAS_0 1 0 RXPLL prescaler reference bias current. 200 µA (00) to 500 µA (11) Bit21 RXPRES_BIAS_1 1 1 Bit22 RXVCO_CAL_IB 0 1 Select bias-current type for VCO calibration circuitry; 1 = PTAT; 0 = constant over temperature Bit23 RXVCO_CAL_REF_0 0 1 RX VCO calibration reference voltage trimming. 000 → 1.175 V Bit24 RXVCO_CAL_REF_1 0 1 111 → 2.05 V. Suggested value is 1.55 V (011). Bit25 RXVCO_CAL_REF_2 0 0 Bit26 RSV 0 0 Reserved Bit27 RSV 0 0 Reserved Bit28 RSV 0 0 Reserved Bit29 RSV 0 0 Reserved Bit30 RSV 0 0 Reserved Bit31 RSV 0 0 Reserved 40 Submit Documentation Feedback Copyright © 2009, Texas Instruments Incorporated Product Folder Link(s): TRF2443 |
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