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CC1021-RTR1 Datasheet(PDF) 71 Page - Texas Instruments |
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CC1021-RTR1 Datasheet(HTML) 71 Page - Texas Instruments |
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71 / 91 page  Not Recommended for New Designs NRND CC1021 www.ti.com SWRS045D – JANUARY 2006 – REVISED JANUARY 2015 Table 5-40. FRONTEND Register (16h) DEFAULT REGISTER NAME ACTIVE DESCRIPTION VALUE FRONTEND[7:6] LNAMIX_CURRENT[1:0] 2 — Controls current in LNA, LNA2 and mixer Recommended setting: LNAMIX_CURRENT=1 FRONTEND[5:4] LNA_CURRENT[1:0] 1 — Controls current in the LNA Recommended setting: LNA_CURRENT=3. Can be lowered to save power at the expense of reduced sensitivity. FRONTEND[3] MIX_CURRENT 0 — Controls current in the mixer Recommended setting: MIX_CURRENT=1 at 402 to 470 MHz, MIX_CURRENT=0 at 804 to 960 MHz. FRONTEND[2] LNA2_CURRENT 0 — Controls current in LNA 2 Recommended settings: LNA2_CURRENT=0 at 402 to 470 MHz, LNA2_CURRENT=1 at 804 to 960 MHz. FRONTEND[1] SDC_CURRENT 0 — Controls current in the single-to-diff. Converter Recommended settings: SDC_CURRENT=0 at 426 to 464 MHz, SDC_CURRENT=1 at 852 to 928 MHz. FRONTEND[0] LNAMIX_BIAS 1 — Controls how front-end bias currents are generated 0: Constant current biasing 1: Constant Gm × R biasing (reduces gain variation) Recommended setting: LNAMIX_BIAS=0. Table 5-41. ANALOG Register (17h) DEFAULT REGISTER NAME ACTIVE DESCRIPTION VALUE ANALOG[7] BANDSELECT 1 — Frequency band selection 0: 402 to 470 MHz band 1: 804 to 960 MHz band ANALOG[6] LO_DC 1 — Lower LO DC level to mixers 0: High LO DC level to mixers 1: Low LO DC level to mixers Recommended settings: LO_DC=1 for 402 to 470 MHz, LO_DC=0 for 804 to 960 MHz. ANALOG[5] VGA_BLANKING 1 H Enable analog blanking switches in VGA when changing VGA gain. 0: Blanking switches are disabled 1: Blanking switches are turned on for approx. 0.8 μs when gain is changed (always on if AGC_DISABLE=1) Recommended setting: VGA_BLANKING=0. ANALOG[4] PD_LONG 0 H Selects short or long reset delay in phase detector 0: Short reset delay 1: Long reset delay Recommended setting: PD_LONG=0. ANALOG[3] — 0 — Reserved, write 0 ANALOG[2] PA_BOOST 0 H Boost PA bias current for higher output power Recommended setting: PA_BOOST=1. Copyright © 2006–2015, Texas Instruments Incorporated Detailed Description 71 Submit Documentation Feedback Product Folder Links: CC1021 |
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