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LTC6948 Datasheet(PDF) 29 Page - Analog Devices |
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LTC6948 Datasheet(HTML) 29 Page - Analog Devices |
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29 / 32 page  LTC5594 29 Rev A For more information www.analog.com APPENDIX Table 10. Serial Port Register Bit Field Summary BITS FUNCTION DESCRIPTION VALID VALUES DEFAULT AMPCC[1:0] IF Amplifier IM3 CC Adjust Used to optimize the IF amplifier IM3. 0x00 to 0x03 0x02 AMPIC[1:0] IF Amplifier IM3 IC Adjust Used to optimize the IF amplifier IM3. 0x00 to 0x03 0x02 AMPG[2:0] IF Amplifier Gain Adjust Adjusts the amplifier gain from 8dB to 15dB. 0x00 to 0x07 0x06 BAND LO Band Select Selects which LO matching band is used. BAND = 1 for high band. BAND = 0 for low band. 0, 1 1 CF1[5:0] LO Matching Capacitor CF1 Controls the CF1 capacitor in the LO matching network. 0x00 to 0x1F 0x08 CF2[5:0] LO Matching Capacitor CF2 Controls the CF2 capacitor in the LO matching network. 0x00 to 0x1F 0x03 CHIPID Chip Identification Bits Factory set to default value. 0x00 to 0x03 0x00 DCOI[7:0] I-Channel DC Offset Controls the I-channel DC offset over a range from –200mV to 200mV. 0x00 to 0xFF 0x80 DCOQ[7:0] Q-Channel DC Offset Controls the Q-channel DC offset over a range from –200mV to 200mV. 0x00 to 0xFF 0x80 EADJ Enable Nonlinearity Adjust Enables the nonlinearity adjustment circuitry if EADJ = 1. 0, 1 1 EAMP Enable IF Amplifiers Enables the IF amplifiers if EAMP = 1. 0, 1 1 EDC Enable DC Offset Adjust Enables the DC offset adjustment circuitry if EDC = 1. 0, 1 1 EDEM Enable Demodulator Enables the demodulator circuitry if EDEM = 1. 0, 1 1 GERR[5:0] IQ Gain Error Adjust Controls the IQ gain error over a range from –0.5dB to 0.5dB. 0x00 to 0x3F 0x20 HD2IX[7:0] HD2 I-Channel X-Vector Controls the I-channel HD2 X-vector adjustment if EADJ = 1. 0x00 to 0xFF 0x80 HD2IY[7:0] HD2 I-Channel Y-Vector Controls the I-channel HD2 Y-vector adjustment if EADJ = 1. 0x00 to 0xFF 0x80 HD2QX[7:0] HD2 Q-Channel X-Vector Controls the Q-channel HD2 X-vector adjustment if EADJ = 1. 0x00 to 0xFF 0x80 HD2QY[7:0] HD2 Q-Channel Y-Vector Controls the Q-channel HD2 Y-vector adjustment if EADJ = 1. 0x00 to 0xFF 0x80 HD3IX[7:0] HD3 I-Channel X-Vector Controls the I-channel HD3 X-vector adjustment if EADJ = 1. 0x00 to 0xFF 0x80 HD3IY[7:0] HD3 I-Channel Y-Vector Controls the I-channel HD3 Y-vector adjustment if EADJ = 1. 0x00 to 0xFF 0x80 HD3QX[7:0] HD3 Q-Channel X-Vector Controls the Q-channel HD3 X-vector adjustment if EADJ = 1. 0x00 to 0xFF 0x80 HD3QY[7:0] HD3 Q-Channel Y-Vector Controls the Q-channel HD3 Y-vector adjustment if EADJ = 1. 0x00 to 0xFF 0x80 IM2IX[7:0] IM2 I-Channel X-Vector Controls the I-channel IM2 X-vector adjustment if EADJ = 1. 0x00 to 0xFF 0x80 IM2QX[7:0] IM2 Q-Channel X-Vector Controls the Q-channel IM2 X-vector adjustment if EADJ = 1. 0x00 to 0xFF 0x80 IM3IX[7:0] IM3 I-Channel X-Vector Controls the I-channel IM3 X-vector adjustment if EADJ = 1. 0x00 to 0xFF 0x80 IM3IY[7:0] IM3 I-Channel Y-Vector Controls the I-channel IM3 Y-vector adjustment if EADJ = 1. 0x00 to 0xFF 0x80 IM3QX[7:0] IM3 Q-Channel X-Vector Controls the Q-channel IM3 X-vector adjustment if EADJ = 1. 0x00 to 0xFF 0x80 IM3QY[7:0] IM3 Q-Channel Y-Vector Controls the Q-channel IM3 Y-vector adjustment if EADJ = 1. 0x00 to 0xFF 0x80 IP3CC[1:0] RF Input IP3 CC Adjust Used to optimize the RF input IP3. 0x00 to 0x03 0x02 IP3IC[2:0] RF Input IP3 IC Adjust Used to optimize the RF input IP3. 0x00 to 0x07 0x04 LF1[1:0] LO Matching Inductor LF1 Controls the LF1 inductor in the LO matching network. 0x00 to 0x03 0x03 LVCM[2:0] LO Bias Adjust Used to optimize mixer IP3. 0x00 to 0x07 0x02 PHA[8:0] IQ Phase Error Adjust Controls the IQ phase error over a range from –2.5 Degrees to 2.5 Degrees. 0x000 to 0x1FF 0x100 SDO_MODE SDO Readback Mode Enables the SDO readback mode if SDO_MODE = 1. 0, 1 0 SRST Soft Reset Writing 1 to this bit resets all registers to their default values. 0, 1 0 |
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