ADF4107
PIN CONFIGURATIONS AND FUNCTIONAL DESCRIPTIONS
CSP
TSSOP
(Chip Scale Package)
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
R
P
SET
CP
DV
DD
MUXOUT
LE
CPGND
AGND
ADF4107
TOP VIEW
PIN 1
15 MUXOUT
14 LE
CPGND 1
AGND 2
AGND 3
INDICATOR
RF
B
DATA
CLK
IN
(Not to Scale)
13 DATA
12 CLK
11 CE
ADF4107
TOP VIEW
RF
A
IN
RF B 4
IN
RF A 5
IN
CE
AV
DD
DGND
REF
IN
Figure 3. ADF4107 TSSOP (Top View)
Figure 4. ADF4107 Chip Scale Package
Table 4. Pin Functional Descriptions
Mnemonic Function
Connecting a resistor between this pin and CPGND sets the maximum charge pump output current. The nominal voltage
potential at the RSET pin is 0.66 V. The relationship between ICP and RSET is
25.5
RSET
RSET
ICP MAX
=
so, with RSET = 5.1 kΩ, ICP MAX = 5 mA.
CP
Charge Pump Output. When enabled, this pin provides ICP to the external loop filter, which in turn drives the external VCO.
Charge Pump Ground. This is the ground return path for the charge pump.
Analog Ground. This is the ground return path of the prescaler.
CPGND
AGND
Complementary Input to the RF Prescaler. This point must be decoupled to the ground plane with a small bypass capacitor,
typically 100 pF. See Figure 18.
RFINB
RFINA
AVDD
Input to the RF Prescaler. This small signal input is ac-coupled to the external VCO.
Analog Power Supply. This voltage may range from 2.7 V to 3.3 V. Decoupling capacitors to the analog ground plane should
be placed as close as possible to this pin. AVDD must be the same value as DVDD.
Reference Input. This is a CMOS input with a nominal threshold of VDD/2 and a dc equivalent input resistance of 100 kΩ. See
Figure 17. This input can be driven from a TTL or CMOS crystal oscillator or it can be ac-coupled.
REFIN
DGND
CE
Digital Ground.
Chip Enable. A logic low on this pin powers down the device and puts the charge pump output into three-state mode. Taking
the pin high will power up the device, depending on the status of the power-down bit, F2.
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.
CLK
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.
DATA
LE
Load Enable, CMOS Input. When LE goes high, the data stored in the shift registers is loaded into one of the four latches, the
latch being selected using the control bits.
This multiplexer output allows either the lock detect, the scaled RF, or the scaled reference frequency to be accessed
externally.
MUXOUT
DVDD
VP
Digital Power Supply. This may range from 2.7 V to 3.3 V. Decoupling capacitors to the digital ground plane should be placed
as close as possible to this pin. DVDD must be the same value as AVDD.
Charge Pump Power Supply. This voltage should be greater than or equal to VDD. In systems where VDD is 3 V, it can be set to 5
V and used to drive a VCO with a tuning range of up to 5 V.
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