
MAX2870
23.5MHz to 6000MHz Fractional/
Integer-N Synthesizer/VCO
Table 7. Register 3 (Address: 011, Default: 0000000B HEX )
BIT LOCATION
BIT ID
NAME
DEFINITION
Manual selection of VCO and VCO sub-band when VAS is disabled.
31:26
VCO[5:0]
VCO
000000 = VCO0
….
111111 = VCO63
Sets VAS state machine mode.
25
VAS_SHDN
VAS_SHDN
0 = VAS enabled
1 = VAS disabled
Sets VAS response to temperature drift.
24
RETUNE
RETUNE
0 = VAS auto-retune over temp disabled
1 = VAS auto-retune over temp enabled
23:18
17
Reserved
Reserved
Reserved
Reserved
Reserved. Program to 000000.
Reserved. Program to 0.
Sets clock divider mode.
16:15
CDM[1:0]
Clock Divider
Mode
00 = Clock divider off
01 = Fast-lock enabled
10 = Phase mode
11 = Reserved
Sets 12-bit clock divider value.
000000000000 = Unused
14:3
CDIV[11:0]
Clock Divider
Value
000000000001 = 1
000000000010 = 2
-----
111111111111 = 4095
2:0
Maxim Integrated
ADDR[2:0]
Address Bits
Register address
19