Data Sheet ADF4360-4
Rev. C | Page 7 of 24
PIN CONFIGURATION AND FUNCTIONAL DESCRIPTIONS
04438-003
2
1
3
4
5
6
18
17
16
15
14
13
V
VCO
REF
OUT
B
REF
OUT
A
AGND
A
V
DD
CPGND
R
SET
C
N
DGND
REF
IN
CLK
D
AT
A
8
9
10
11
7
AGND
AGND
AGND
AGND
12
C
C
V
TUNE
20
19
21
MUXOUT
LE
DV
DD
22
AGND
23
CE
24
C
P
ADF4360-4
TOP VIEW
(Not to Scale)
NOTES
1. THE EXPOSED PAD MUST BE CONNECTED TO AGND.
Figure 3. Pin Configuration
Table 4. Pin Functional Descriptions
Pin No. Mnemonic Description
1 CPGND Charge Pump Ground. This is the ground return path for the charge pump.
2 AV
DD
Analog Power Supply. 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 this pin. AV
DD
must have the same value as DV
DD
.
3, 8 to 11, 22 AGND Analog Ground. This is the ground return path of the prescaler and VCO.
4 RF
OUT
A
VCO Output. The output level is programmable from −4 dBm to −13 dBm. See the Output Matching section for
a description of the various output stages.
5 RF
OUT
B
VCO Complementary Output. The output level is programmable from −4 dBm to −13 dBm. See the Output
Matching section for a description of the various output stages.
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 this pin. V
VCO
must have the same value as AV
DD
.
7 V
TUNE
Control Input to the VCO. This voltage determines the output frequency and is derived from filtering the CP output voltage.
12 C
C
Internal Compensation Node. This pin must be decoupled to ground with a 10 nF capacitor.
13 R
SET
Connecting a resistor between this pin and CP
GND
sets the maximum charge pump output current for the
synthesizer. The nominal voltage potential at the R
SET
pin is 0.6 V. The relationship between I
CP
and R
SET
is
where R
SET
= 4.7 kΩ, I
CPmax
= 2.5 mA.
14 C
N
Internal Compensation Node. This pin must be decoupled to V
VCO
with a 10 µF capacitor.
15 DGND Digital Ground.
16 REF
IN
Reference Input. This is a CMOS input with a nominal threshold of V
DD
/2 and a dc equivalent input resistance of
100 kΩ. See Figure 10. This input can be driven from a TTL or CMOS crystal oscillator or it can be ac-coupled.
Serial Clock Input. This serial clock is used to clock in the serial data to the registers. The data is latched into the
24-bit shift register on the CLK rising edge. This input is a high impedance CMOS input.
18 DATA
Serial Data Input. The serial data is loaded MSB first with the two LSBs being the control bits. This input is a
high impedance CMOS input.
19 LE
Load Enable, CMOS Input. When LE goes high, the data stored in the shift registers is loaded into one of the
four latches, and the relevant latch is selected using the control bits.
20 MUXOUT
This multiplexer output allows either the lock detect, the scaled RF, or the scaled reference frequency to be
accessed externally.
21 DV
DD
Digital Power Supply. This ranges from 3.0 V to 3.6 V. Decoupling capacitors to the digital ground plane should
be placed as close as possible to this pin. DV
DD
must have the same value as AV
DD
.
23 CE
Chip Enable. A logic low on this pin powers down the device and puts the charge pump into three-state mode.
Taking the pin high powers up the device depending on the status of the power-down bits.
24 CP Charge Pump Output. When enabled, this provides ± I
CP
to the external loop filter, which in turn drives the internal VCO.
EP Exposed Pad. The exposed pad must be connected to AGND.
