U3550BM Datasheet, PDF (8/25 Pages) TEMIC Semiconductors – Low-Power FM Transmitter / Synthesizer System 26 to 50 MHz

U3550BM
R11: Setting VCO2 and VCO3
free
free
FRMT
free
FRMT: Output frequency range of Mixer T
AMIX[2:1]: Lengthening anti-backlash signal mixer loop
RA2[1:0]: Rough adjustment VCO2
AMIX2
AMIX1
RA21
RA20
R12: Divider for country setting, fine adjust oscillator
FAOS2
FAOS1
FAOS0
D31
D30
D20
D11
D10
FAOS[2:0]: Oscillator fine adjust
D3[1:0]: Setting divider D3
D20: Setting divider D2
D1[1:0]: Setting divider D1
R13: VCO1 enable and fine adjust
EVCO1
SAFA1
EAFA1
FA14
EVCO1: Enable VCO1
SAFA1: Sign for automatic fine adjust VCO1
EAFA1: Enable automatic fine adjust VCO1
FA1[4:0]: Fine adjust VCO1 for manual adjustment
FA13
FA12
FA11
FA10
R14: VCO2 enable and fine adjust
EVCO2
SAFA2
EAFA2
FA24
EVCO2: Enable VCO2 and Mixer T
SAFA2: Sign for automatic fine adjust VCO2
EAFA2: Enable automatic fine adjust VCO2
FA2 [4:0]: Fine adjust VCO2 for manual adjustment
FA23
FA22
FA21
FA20
R15: VCO3 enable, oscillator enable, selection of phase comparator VCO3 and speed-up phase comparator for VCO3
EVCO3
EOSC
SU3
E25K
E12K5
E10K
E6K25
E5K
EVCO3: Enable VCO3 and Mixer 1
EOSC: Enable oscillator
SU3: Speed-up phase-comparator for VCO3
E25K: Selection phase-comparator frequency VCO3: f_Ref3 = 25 kHz
E12K5: Selection phase-comparator frequency VCO3: f_Ref3 = 12.5 kHz
E10K: Selection phase-comparator frequency VCO3: f_Ref3 = 10 kHz
E6K25: Selection phase-comparator frequency VCO3: f_Ref3 = 6.25 kHz
E5K: Selection phase-comparator frequency VCO3: f_Ref3 = 5 kHz
E5K, E6K25, El0K, El2K5, E25K = 0 Selection phase-comparator frequency VCO3: f_Ref3 = 2.5 kHz
8 (25)
Rev. A2, 10-Sep-98
Preliminary Information