Datasheet

MAX2870
23.5MHz to 6000MHz Fractional/
Integer-N Synthesizer/VCO
20Maxim Integrated
Table 8. Register 4 (Address: 100, Default: 6180B23C
HEX
)
BIT LOCATION BIT ID NAME DEFINITION
31:26 Reserved Reserved Reserved. Program to 011000.
25:24 BS_MSBs[1:0] Band-Select MSBs Band-select MSBs. See bits [19:12].
23 FB
VCO Feedback
Mode
Sets VCO to N counter feedback mode.
0 = Divided
1 = Fundamental
22:20 DIVA[2:0]
RFOUT_ Output
Divider Mode
Sets RFOUT_ output divider mode. Double buffered by register 0
when REG4DB = 1.
000 = Divide by 1, if 3000MHz ≤ f
RFOUTA
≤ 6000MHz
001 = Divide by 2, if 1500MHz ≤ f
RFOUTA
< 3000MHz
010 = Divide by 4, if 750MHz ≤ f
RFOUTA
< 1500MHz
011 = Divide by 8, if 375MHz ≤ f
RFOUTA
< 750MHz
100 = Divide by 16, if 187.5MHz ≤ f
RFOUTA
< 375MHz
101 = Divide by 32, if 93.75MHz ≤ f
RFOUTA
< 187.5MHz
110 = Divide by 64, if 46.875MHz ≤ f
RFOUTA
< 93.75MHz
111 = Divide by 128, if 23.5MHz ≤ f
RFOUTA
< 46.875MHz
19:12 BS[7:0] Band Select
Sets band select clock divider value. MSB are located in bits [25:24].
0000000000 = Reserved
0000000001 =1
0000000010 = 2
----
1111111111 = 1023
11 Reserved Reserved Reserved. Program to 0.
10 Reserved Reserved Reserved. Program to 0.
9 BDIV
RFOUTB Output
Path Select
Sets RFOUTB output path select.
0 = VCO divided output
1 = VCO fundamental frequency
8 RFB_EN
RFOUTB Output
Mode
Sets RFOUTB output mode.
0 = Disabled
1 = Enabled
7:6 BPWR[1:0]
RFOUTB Output
Power
Sets RFOUTB single-ended output power. See the RFOUTAQ and
RFOUTBQ section.
00 = -4dBm
01 = -1dBm
10 = +2dBm
11 = +5dBm
5 RFA_EN
RFOUTA Output
Mode
Sets RFOUTA output mode.
0 = Disabled
1 = Enabled
4:3 APWR[1:0]
RFOUTA Output
Power
Sets RFOUTA single-ended output power. See the RFOUTAQ and
RFOUTBQ section.
00 = -4dBm
01 = -1dBm
10 = +2dBm
11 = +5dBm
2:0 ADDR[2:0] Register Address Register address