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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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CC1020-RTR1 Datenblatt(PDF) 76 Page - Texas Instruments |
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CC1020-RTR1 Datenblatt(HTML) 76 Page - Texas Instruments |
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76 / 95 page  CC1020 SWRS046H – NOVEMBER 2006 – REVISED MARCH 2015 www.ti.com Table 5-43. BUFF_CURRENT Register (19h) DEFAULT REGISTER NAME ACTIVE DESCRIPTION VALUE BUFF_CURRENT[7:6] PRE_CURRENT[1:0] 1 — Prescaler current scaling 0: Nominal current 1: 2/3 of nominal current 2: 1/2 of nominal current 3: 2/5 of nominal current Recommended setting: PRE_CURRENT=0. BUFF_CURRENT[5:3] RX_CURRENT[2:0] 4 — LO buffer current, in RX (to mixers) 0: Minimum buffer current … 7: Maximum buffer current Recommended setting: RX_CURRENT=4. BUFF_CURRENT[2:0] TX_CURRENT[2:0] 5 — LO buffer current, in TX (to PA driver) 0: Minimum buffer current … 7: Maximum buffer current Recommended settings: TX_CURRENT=2 for 402 to 470 MHz, TX_CURRENT=5 for 804 to 960 MHz. Table 5-44. PLL_BW Register (1Ah) DEFAULT REGISTER NAME ACTIVE DESCRIPTION VALUE PLL_BW[7:0] PLL_BW[7:0] 134 — Charge pump current scaling/rounding factor. Used to calibrate charge pump current for the desired PLL loop bandwidth. The value is given by: PLL_BW = 174 + 16 log2(fref / 7.126) where fref is the reference frequency in MHz. Table 5-45. CALIBRATE Register (1Bh) DEFAULT REGISTER NAME ACTIVE DESCRIPTION VALUE CALIBRATE[7] CAL_START 0 ↑ ↑ 1: Calibration started 0: Calibration inactive CALIBRATE[6] CAL_DUAL 0 H Use calibration results for both frequency A and B 0: Store results in A or B defined by F_REG (MAIN[6]) 1: Store calibration results in both A and B CALIBRATE[5:4] CAL_WAIT[1:0] 0 — Selects calibration wait time (affects accuracy) 0 (00): Calibration time is approx. 90000 F_REF periods 1 (01): Calibration time is approx. 110000 F_REF periods 2 (10): Calibration time is approx. 130000 F_REF periods 3 (11): Calibration time is approx. 200000 F_REF periods Recommended setting: CAL_WAIT=3 for best accuracy in calibrated PLL loop filter bandwidth. CALIBRATE[3] — 0 — Reserved, write 0 76 Detailed Description Copyright © 2006–2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: CC1020 |
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