MAX2121 データシートの表示（PDF） - Maxim Integrated
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MAX2121 Datasheet PDF : 18 Pages
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Complete Direct-Conversion L-Band Tuner
Table 13. Test Register (Address: 0x0B)
BIT NAME BIT LOCATION (0 = LSB) DEFAULT
FUNCTION
CPTST[2:0]
7–5
000
Charge-pump test modes.
000 = Normal operation (default).
X
4
X
Don’t care.
TURBO
3
1
Charge-pump fast lock.
Users must program to 1 after powering up the device.
LDMUX[2:0]
2–0
000
REFOUT output.
000 = Normal operation; other values are not tested.
Table 14. Status Byte-1 Register (Address: 0x0C)
BIT NAME BIT LOCATION (0 = LSB)
FUNCTION
POR
Power-on reset status.
7
0 = Chip status register has been read with a stop condition since last power-on.
1 = Power-on reset (power cycle) has occurred. Default values have been loaded in
registers.
VASA
Indicates whether VCO autoselection was successful.
6
0 = Indicates the autoselect function is disabled or unsuccessful VCO selection.
1 = Indicates successful VCO autoselection.
VASE
Status indicator for the autoselect function.
5
0 = Indicates the autoselect function is active.
1 = Indicates the autoselect process is inactive.
PLL lock detector. TURBO bit must be programmed to 1 for valid LD reading.
LD
4
0 = Unlocked.
1 = Locked.
X
3–0
Don’t care.
Table 15. Status Byte-2 Register (Address: 0x0D)
BIT NAME
VCOSBR[4:0]
ADC[2:0]
BIT LOCATION (0 = LSB)
7–3
2–0
VCO band readback.
VAS ADC output readback.
000 = Out of lock.
001 = Locked.
010 = VAS locked.
101 = VAS locked.
110 = Locked.
111 = Out of lock.
FUNCTION
______________________________________________________________________________________ 13
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