Data Sheet
ADF4110/ADF4111/ADF4112/ADF4113
19 R
SET
18 V
P
17 DV
DD
16 DV
DD
15 MUXOUT
14 LE
13 DATA
12 CLK
11 CE
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
R
SET
CP
CPGND
AGND
RF
IN
B
RF
IN
A
AV
DD
REF
IN
1
2
3
4
5
6
16
V
P
DV
DD
MUXOUT
LE
DATA
ADF4110
ADF4111
ADF4112
ADF4113
15
14
13
12
CPGND 1
AGND 2
AGND 3
RF
IN
B 4
RF
IN
A 5
03496-0-003
20 CP
6
11
CLK
TOP VIEW
7
(Not to Scale)
10
CE
8
9
ADF4110
ADF4111
ADF4112
ADF4113
TOP VIEW
(Not to Scale)
7
REF
IN
8
9
DGND
AV
DD
AV
DD
DGND
DGND 10
NOTES
1. THE EXPOSED PADDLE SHOULD BE CONNECTED TO AGND.
Figure 3. TSSOP Pin Configuration
Figure 4. LFCSP Pin Configuration
Table 4. Pin Function Descriptions
TSSOP
Pin No.
1
LFCSP
Pin No.
19
Mnemonic
R
SET
Function
Connecting a resistor between this pin and CPGND sets the maximum charge pump output current.
The nominal voltage potential at the
R
SET
pin is 0.56 V. The relationship between
I
CP
and
R
SET
is
I
CPmax
=
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
20
1
2, 3
4
5
6, 7
8
9, 10
11
12
13
14
15
16, 17
18
CP
CPGND
AGND
RF
IN
B
RF
IN
A
AV
DD
REF
IN
DGND
CE
CLK
DATA
LE
MUXOUT
DV
DD
V
P
EPAD
23.5
R
SET
So, with
R
SET
= 4.7 kΩ,
I
CPmax
= 5 mA.
Charge Pump Output. When enabled, this provides ±I
CP
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.
Complementary Input to the RF Prescaler. This point should be decoupled to the ground plane with
a small bypass capacitor, typically 100 pF. See Figure 29.
Input to the RF Prescaler. This small-signal input is ac-coupled from the VCO.
Analog Power Supply. This may range from 2.7 V to 5.5 V. Decoupling capacitors to the analog ground
plane should be placed as close as possible to this pin. AV
DD
must be the same value as DV
DD
.
Reference Input. This is a CMOS input with a nominal threshold of V
DD
/2, and an equivalent input
resistance of 100 kΩ. See Figure 28. This input can be driven from a TTL or CMOS crystal oscillator, or
can be ac-coupled.
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 powers 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.
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.
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 is 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.
Digital Power Supply. This may range from 2.7 V to 5.5 V. Decoupling capacitors to the digital ground
plane should be placed as close as possible to this pin. DV
DD
must be the same value as AV
DD
.
Charge Pump Power Supply. This should be greater than or equal to V
DD
. In systems where V
DD
is 3 V,
V
P
can be set to 6 V and used to drive a VCO with a tuning range of up to 6 V. 1
Exposed Pad (LFCSP Only). The exposed paddle should be connected to AGND.
Rev. F | Page 7 of 28
03496-0-004
AD [ ANALOG DEVICES ]
