adf4212l Analog Devices, Inc., adf4212l Datasheet - Page 5

• Manufacturer Part Number: adf4212l
• Description: Dual Low Power Pll Frequency Synthesizer
• Manufacturer: Analog Devices, Inc.

Mnemonic
CP
DGND
RF
AGND
FL
REF
DGND
MUXOUT
CLK
DATA
LE
R
AGND
IF
CP
V
V
V
V
REV. A
SET
P
DD
DD
P
IN
2
1
O
RF
IN
IF
2
1
IN
RF
IF
RF
IF
MUXOUT
DGND
AGND
DGND
This multiplexer output allows either the IF/RF lock detect, the scaled RF, the scaled IF, or the scaled reference
Serial Data Input. The serial data is loaded MSB first with the two LSBs being the control bits. This input is a
Description
RF Charge Pump Output. When enabled, this provides ±I
external RF VCO.
Digital Ground Pin for the RF Digital Circuitry.
Input to the RF Prescaler. This small signal input is normally ac-coupled from the RF VCO.
Ground Pin for the RF Analog Circuitry.
Multiplexed Output of RF/IF Programmable or Reference Dividers, RF/IF Fastlock Mode. CMOS output.
Reference Input. This is a CMOS input with a nominal threshold of V
100 kΩ. See Figure 2. This input can be driven from a TTL or CMOS crystal oscillator, or can be ac-coupled.
Digital Ground Pin for the IF Digital, Interface, and Control Circuitry.
frequency to be accessed externally.
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.
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 being selected using the control bits.
Connecting a resistor between this pin and ground sets the maximum RF and IF charge pump output current. The
nominal voltage potential at the R
therefore, with R
Ground Pin for the IF Analog Circuitry.
Input to the IF Prescaler. This small signal input is normally ac-coupled from the IF VCO.
Output from the IF Charge Pump. This is normally connected to a loop filter that drives the input to an external VCO.
Power Supply for the IF Charge Pump. This should be greater than or equal to V
can be set to 5.5 V and used to drive a VCO with a tuning range up to 5.5 V.
Power Supply for the IF, Digital, and Interface Section. Decoupling capacitors to the ground plane should be
placed as close as possible to this pin. V
same potential as V
Power Supply for the RF Section. Decoupling capacitors to the ground plane should be placed as close as possible
to this pin. V
Power Supply for the RF Charge Pump. This should be greater than or equal to V
can be set to 5.5 V and used to drive a VCO with a tuning range up to 5.5 V.
REF
CP
V
RF
FL
DD
V
P
RF
RF
RF
IN
IN
O
IF
1
1
10
1
2
3
4
5
6
7
8
9
ADF4212L
(Not To Scale)
TSSOP
TOP VIEW
DD
1 should have a value of between 2.6 V and 3.3 V. V
SET
DD
= 2.7 kΩ, I
20
19
18
17
16
15
14
13
12
11
1.
V
V
CP
DGND
IF
AGND
R
LE
DATA
CLK
DD
P
SET
IN
2
IF
2
IF
IF
PIN FUNCTION DESCRIPTION
CP MAX
SET
PIN CONFIGURATIONS
pin is 0.66 V. The relationship between I
= 5 mA for both the RF and IF charge pumps.
DD
2 should have a value of between 2.6 V and 3.3 V. V
–5–
I
CP MAX
CP
=
13 5 .
R
to the external RF loop filter, which in turn drives the
SET
DGND
AGND
DD
CP
DD
RF
FL
1 must have the same potential as V
RF
RF
RF
IN
O
/2 and an equivalent input resistance of
1
2
3
4
5
(NOT TO SCALE)
20
ADF4212L
DD
6
DD
CP
LFCSP
TOP VIEW
19
2. In systems where V
7
1. In systems where V
and R
18
8
17
9
16
10
SET
15
14
13
12
11
is
DGND
IF
AGND
R
LE
SET
IN
ADF4212L
DD
IF
IF
2 must have the
DD
DD
2 is 3 V, it
1 is 3 V, it
DD
2.