ADRF6702 Analog Devices, Inc., ADRF6702 Datasheet - Page 16

• Manufacturer Part Number: ADRF6702
• Description: 1550 Mhz To 2150 Mhz Quadrature Modulator With Integrated Fractional-n Pll And Vco
• Manufacturer: Analog Devices, Inc.

ADRF6702
REGISTER 6 VCO CONTROL AND ENABLES
With R6[2:0] set to 110, the VCO Control and Enables register
is programmed as shown in figure 16.
VCO band selection is normally selected based on BANDCAL
calibration, though the user can directly select the VCO band
using register 6. The VCO BS SRC determines whether the
BANDCAL calibration will determine the optimum VCO
tuning band, or if the external SPI interface will be used to
select the VCO tuning band based on the value of the VCO
Band Select.
DB23
0
DB22
0
DB21
0
Charge
Enable
CPEN
Pump
CPEN
DB20
0
1
Enable
L3EN
Disable
Enable (default)
DB19
L3EN
LDO
3.3V
Charge Pump
0
1
Enable
Enable
LVEN
Disable
Enable (default)
DB18
LVEN VCOEN VCOSW
VCO
LDO
0
1
3.3V LDO
Enable
VCOEN
Enable
Disable
Enable (default)
DB17
VCO
VCO LDO Enable
0
1
VCOSW
Control
Switch
DB16
VCO
Disable
Enable (default)
0
1
VCO Enable
DB15
VC5
Regular (default)
BANDCAL
Figure 11. VCO Control and Enable(R6)
Control from
VCO Switch
DB14
VC4
SPI
VCO Amplitude Setting
DB13
VC3
Rev. PrE | Page 16 of 18
DB12
VC2
VC5
VC5
0
0
0
0
1
1
1
1
'
'
'
'
'
'
DB11
VC4
VC4
VC1
0
0
1
1
1
1
1
1
'
'
'
'
'
'
The VCO amplitude can be controlled through register 6. The
VCO amplitude setting can be controlled between 0 and 31
decimal, with a default value of 31.
The internal VCO can be disabled using register 6. The
internal VCO LDO can be disabled if an external clean 2.5V
supply is available to be applied to pins 9 and 16.
Additionally the 3.3V on-board LDO can be disabled through
register 6 and an external 3.3V supply can be applied to pin 2.
The internal charge pump can be disabled through register 6.
Normally the charge pump will be enabled.
VC3
VC3
DB10
VC0
0
0
1
1
0
0
1
1
'
'
'
'
'
'
VC2
VC2
VBSRC VBS5
VBSRC
VCO
SRC
0
0
0
0
1
1
1
1
DB9
'
'
'
'
'
'
BS
0
1
VC1
VC1
VBS5
0
0
0
0
1
1
1
1
'
'
'
'
'
'
'
'
'
'
'
'
DB8
BANDCAL (default)
SPI
0
1
1
(
(
(
(
'
'
VCO Band Calibration
& SW Source Control
'
'
'
'
'
'
VC0
VC0
0
0
0
0
1
1
1
1
'
'
'
'
'
'
VBS4
VBS4
DB7
0
0
1
'
'
0
0
24
24
55
55
63
63
Preliminary Technical Data
VCO Band Select
VCO Amplitude
VCO Amplitude
'
'
'
'
'
'
recommended)
recommended)
' '
' '
default)
default)
' '
' '
' '
' '
VBS3
VBS3
DB6
Setting
Setting
'
'
'
'
'
'
0
0
1
'
'
VBS2
VBS2
DB5
0
0
1
'
'
VBS1
DB4
VBS1
0
0
1
'
'
0
(
VBS0
DB3
VBS0
0
0
1
'
'
C3(1)
32
63
DB2
' ' ' ' ' '
' ' ' ' ' '
VCO Band Select
default)
Control Bits
from SPI
C2(1)
DB1
C1(0)
DB0