adf4351 Analog Devices, Inc., adf4351 Datasheet - Page 8

• Manufacturer Part Number: adf4351
• Description: Wideband Synthesizer With Integrated Vco Preliminary Technical Data Adf4351
• Manufacturer: Analog Devices, Inc.

ADF4351
Pin No.
22
23
24
25
26
27
28
29
30
31
32
33
Mnemonic
R
V
V
LD
PDB
DGND
DV
REF
MUXOUT
SD
SDV
EP
SET
COM
REF
GND
DD
IN
RF
DD
Description
Connecting a resistor between this pin and GND sets the charge pump output current. The nominal voltage
bias at the R
where:
R
I
Internal Compensation Node Biased at Half the Tuning Range. Decoupling capacitors to the ground plane
should be placed as close as possible to this pin.
Reference Voltage. Decoupling capacitors to the ground plane should be placed as close as possible to this pin.
Lock Detect Output Pin. This pin outputs a logic high to indicate PLL lock. A logic low output indicates loss of PLL lock.
RF Power-Down. A logic low on this pin mutes the RF outputs. This function is also software controllable.
Digital Ground. Ground return path for DV
Digital Power Supply. This pin should be the same voltage as AV
should be placed as close as possible to this pin.
Reference Input. This is a CMOS input with a nominal threshold of V
100 kΩ. This input can be driven from a TTL or CMOS crystal oscillator, or it can be ac-coupled.
Multiplexer Output. This multiplexer output allows either the lock detect, the scaled RF, or the scaled reference
frequency to be accessed externally.
Digital Sigma-Delta (Σ-∆) Modulator Ground. Ground return path for the Σ-∆ modulator.
Power Supply Pin for the Digital Σ-∆ Modulator. Should be the same voltage as AV
the ground plane are to be placed as close as possible to this pin.
Exposed Pad.
CP
SET
= 5 mA
= 5.1 kΩ
I
CP
=
R
25.5
SET
SET
pin is 0.55 V. The relationship between I
Rev. PrC | Page 8 of 28
DD
.
CP
and R
SET
DD
is
. Decoupling capacitors to the ground plane
Preliminary Technical Data
DD
/2 and a dc equivalent input resistance of
DD
. Decoupling capacitors to