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MAX2112 Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX2112 Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 19 page Complete, Direct-Conversion Tuner for DVB-S2 Applications ______________________________________________________________________________________ 11 Table 8. PLL Register BIT NAME BIT LOCATION (0 = LSB) DEFAULT FUNCTION D24 7 1 VCO divider setting. 0 = Divide by 2. Use for LO frequencies ≥ 1125MHz. 1 = Divide by 4. Use for LO frequencies < 1125MHz. CPS 6 1 Charge-pump current mode. 0 = Charge-pump current controlled by ICP bit. 1 = Charge-pump current controlled by VCO autoselect (VAS). ICP 5 0 Charge-pump current. 0 = 600µA typical. 1 = 1200µA typical. X 4–0 X Don’t care. Table 9. VCO Register BIT NAME BIT LOCATION (0 = LSB) DEFAULT FUNCTION VCO[4:0] 7–3 11001 Controls which VCO is activated when using manual VCO programming mode. This also serves as the starting point for the VCO autoselection (VAS) mode. VAS 2 1 VCO autoselection (VAS) circuit. 0 = Disable VCO selection must be programmed through I2C. 1 = Enable VCO selection controlled by autoselection circuit. ADL 1 0 Enables or disables the VCO tuning voltage ADC latch when the VCO autoselect mode (VAS) is disabled. 0 = Disables the ADC latch. 1 = Latches the ADC value. ADE 0 0 Enables or disables VCO tuning voltage ADC read when the VCO autoselect mode (VAS) is disabled. 0 = Disables ADC read. 1 = Enables ADC read. Table 10. Lowpass Filter Register BIT NAME BIT LOCATION (0 = LSB) DEFAULT FUNCTION LPF[7:0] 7–0 01001011 Sets the baseband lowpass filter 3dB corner frequency. f-3dB = 4MHz + (LPF[7:0]dec - 12) x 290kHz. Default value equates to f-3dB = 22.27MHz typical. |
Similar Part No. - MAX2112_10 |
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Similar Description - MAX2112_10 |
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