Datasheet
ADF4350
Rev. A | Page 7 of 32
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
1
CLK
2
DATA
3
LE
4
CE
5
SW
6
7
24
V
REF
23
V
COM
22
21
20
19
18
17
8
SDV
DD
ADF4350
TOP VIEW
(Not to Scale)
9
AGND
10
AV
DD
11
REF
IN
12
DGND
13
DV
DD
14
15
16
32
31
30
29
28
SD
GND
27
26
25
PIN 1
INDICATOR
V
P
CP
OUT
CP
GND
MUXOUT
R
SET
RF
OUT
A+
RF
OUT
B+
RF
OUT
B−
RF
OUT
A−
V
VCO
V
TUNE
A
GNDVCO
A
GNDVCO
TEM
P
PDB
RF
LD
A
GNDVCO
V
VCO
07325-003
NOTES
1. THE LFCSP HAS AN EXPOSED PADDLE THAT MUST BE CONNECTED TO GND.
Figure 3. Pin Configuration
Table 4. Pin Function Descriptions
Pin No. Mnemonic Description
1 CLK
Serial Clock Input. Data is clocked into the 32-bit shift register on the CLK rising edge. This input is a high
impedance CMOS input.
2 DATA
Serial Data Input. The serial data is loaded MSB first with the three LSBs as the control bits. This input is a high
impedance CMOS input.
3 LE
Load Enable, CMOS Input. When LE goes high, the data stored in the shift register is loaded into the register
that is selected by the three LSBs.
4 CE
Chip Enable. A logic low on this pin powers down the device and puts the charge pump into three-state mode.
A logic high on this pin powers up the device depending on the status of the power-down bits.
5 SW Fast-Lock Switch. A connection should be made from the loop filter to this pin when using the fast-lock mode.
6 V
P
Charge Pump Power Supply. This pin is to be equal to AV
DD
. Decoupling capacitors to the ground plane are to
be placed as close as possible to this pin.
7 CP
OUT
Charge Pump Output. When enabled, this provides ±I
CP
to the external loop filter. The output of the loop filter is
connected to V
TUNE
to drive the internal VCO.
8 CP
GND
Charge Pump Ground. This is the ground return pin for CP
OUT
.
9 AGND Analog Ground. This is a ground return pin for AV
DD
.
10 AV
DD
Analog Power Supply. This pin ranges from 3.0 V to 3.6 V. Decoupling capacitors to the analog ground plane are
to be placed as close as possible to this pin. AV
DD
must have the same value as DV
DD
.
11, 18, 21 A
GNDVCO
VCO Analog Ground. These are the ground return pins for the VCO.
12 RF
OUT
A+ VCO Output. The output level is programmable. The VCO fundamental output or a divided down version is available.
13 RF
OUT
A−
Complementary VCO Output. The output level is programmable. The VCO fundamental output or a divided
down version is available.
14 RF
OUT
B+
Auxilliary VCO Output. The output level is programmable. The VCO fundamental output or a divided down
version is available.
15 RF
OUT
B−
Complementary Auxilliary VCO Output. The output level is programmable. The VCO fundamental output or a
divided down version is available.
16, 17 V
VCO
Power Supply for the VCO. This ranges from 3.0 V to 3.6 V. Decoupling capacitors to the analog ground plane
should be placed as close as possible to these pins. V
VCO
must have the same value as AV
DD
.
19 TEMP
Temperature Compensation Output. Decoupling capacitors to the ground plane are to be placed as close as
possible to this pin.
20 V
TUNE
Control Input to the VCO. This voltage determines the output frequency and is derived from filtering the CP
OUT
output voltage.