MAX2121 데이터 시트보기 (PDF) - Maxim Integrated
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MAX2121 Datasheet PDF : 18 Pages
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Complete Direct-Conversion L-Band Tuner
Table 8. PLL Register (Address: 0x06)
BIT NAME
D24
CPS
ICP
X
BIT LOCATION (0 = LSB)
7
6
5
4–0
DEFAULT
FUNCTION
VCO divider setting.
1
0 = Divide by 2. Use for LO frequencies 1125MHz.
1 = Divide by 4. Use for LO frequencies < 1125MHz.
Charge-pump current mode.
1
0 = Charge-pump current controlled by ICP bit.
1 = Charge-pump current controlled by VCO autoselect (VAS).
Charge-pump current.
0
0 = 600μA typical.
1 = 1200μA typical.
X
Don’t care.
Table 9. VCO Register (Address: 0x07)
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
VCO autoselection (VAS) circuit.
1
0 = Disable VCO selection must be programmed through I2C.
1 = Enable VCO selection controlled by autoselection circuit.
ADL
1
Enables or disables the VCO tuning voltage ADC latch when the VCO
0
autoselect mode (VAS) is disabled.
0 = Disables the ADC latch.
1 = Latches the ADC value.
ADE
0
Enables or disables VCO tuning voltage ADC read when the VCO
0
autoselect mode (VAS) is disabled.
0 = Disables ADC read.
1 = Enables ADC read.
Table 10. Lowpass Filter Register (Address: 0x08)
BIT NAME BIT LOCATION (0 = LSB) DEFAULT
FUNCTION
Reserved
7–0
01001011 User must program to 10010111 (97h) upon powering up the device.
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