Data Sheet ADF4360-8
Rev. D | Page 7 of 24
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
CPGND
AV
DD
AGND
RF
OUT
A
RF
OUT
B
V
VCO
DATA
CLK
REF
IN
DGND
C
N
R
SET
V
TUNE
AGND
L1
L2
AGND
C
C
CP
CE
AGND
DV
DD
MUXOU
LE
04763-003
PIN 1
IDENTIFIER
NOTES
1. THE EXPOSED PAD MUST BE CONNECTED
TO AGND.
2
1
3
4
5
6
18
17
16
15
14
13
8
9
10
11
7
12
20
19
21
22
23
24
ADF4360-8
TOP VIEW
Figure 3. Pin Configuration
Table 4. Pin Function 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, 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 0 dBm to
−9 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 0 dBm to −9 dBm. See the Output Matching
section for a description of the various output stages.
6 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 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.
9 L1 An external inductor to AGND should be connected to this pin to set the ADF4360-8 output frequency. L1 and L2
need to be the same value. A 470 Ω resistor should be added in parallel to AGND.
10 L2 An external inductor to AGND should be connected to this pin to set the ADF4360-8 output frequency. L1 and L2
need to be the same value. A 470 Ω resistor should be added in parallel to AGND.
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
SET
CPmax
R
I
75.11
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 16). This input can be driven from a TTL or CMOS crystal oscillator, or it can be ac-coupled.
17 CLK 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 lets either the lock detect, the scaled RF, or the scaled reference frequency 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.
