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TRF6901 Datasheet(PDF) 18 Page - Texas Instruments |
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TRF6901 Datasheet(HTML) 18 Page - Texas Instruments |
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18 / 29 page  TRF6901 SINGLECHIP RF TRANSCEIVER SLWS110G − SEPTEMBER 2001 − REVISED JUNE 2004 18 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 PRINCIPLES OF OPERATION Address 00 (A-Word) Terminal 21 (MODE) selects bits A< 21 : 5 > if low, or B< 21 : 5 > if high. Main divider A< 21 : 17 >: 5-bit value for divider ratio of the A-counter Main divider A< 16 : 8 >: 9-bit value for divider ratio of the B-counter PA attenuation A< 7 : 6 >: 2 bits for setting the PA attenuation A< 7:6> PA ATTENUATION 00 10 dB 01 20 dB 10 0 dB 11 Not defined A< 5 >: 1 bit TX/RX mode select A< 5 > TX/RX MODE 0 RX mode 1 TX mode A< 3: 2 >: 2 bits for setting the charge pump current A<3 : 2 > CP CURRENT 00 0.5 mA 01 1 mA 10 0.25 mA 11 Not defined A<1 >: Set to 0 A< 0 >: Enables or disables the dc-dc converter A< 0 > DC-DC CONVERTER 0 Off 1 On NOTE: When A<0> is high, at least one bit in C<6:0> must be high to enable the VCO. |
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