ADF4351BCPZ AD [Analog Devices], ADF4351BCPZ Datasheet - Page 8

• Manufacturer Part Number: ADF4351BCPZ
• Description: Wideband Synthesizer
• Manufacturer: AD [Analog Devices]

ADF4351
Pin No.
22
23
24
25
26
27
28
29
30
31
32
EP
Mnemonic
R
V
V
LD
PDB
DGND
DV
REF
MUXOUT
SD
SDV
Exposed Pad
SET
COM
REF
GND
DD
IN
DD
RF
Description
Connecting a resistor between this pin and ground 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. Place decoupling capacitors to the ground plane
as close to this pin as possible.
Reference Voltage. Place decoupling capacitors to the ground plane as close to this pin as possible.
Lock Detect Output Pin. A logic high output on this pin indicates 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 pin for DV
Digital Power Supply. DV
plane as close to this pin as possible.
Reference Input. This CMOS input has a nominal threshold of AV
100 kΩ. This input can be driven from a TTL or CMOS crystal oscillator, or it can be ac-coupled.
Multiplexer Output. The multiplexer output allows the lock detect value, the N divider value, or the R counter
value to be accessed externally.
Digital Σ-Δ Modulator Ground. Ground return pin for the Σ-Δ modulator.
Power Supply Pin for the Digital Σ-Δ Modulator. SDV
capacitors to the ground plane as close to this pin as possible.
Exposed Pad. The LFCSP has an exposed pad that must be connected to GND.
CP
SET
= 5 mA.
= 5.1 kΩ.
I
CP
= 25.5/R
SET
pin is 0.55 V. The relationship between I
SET
DD
must have the same value as AV
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DD
.
DD
CP
must have the same value as AV
and R
DD
. Place decoupling capacitors to the ground
SET
DD
is as follows:
/2 and a dc equivalent input resistance of
DD
. Place decoupling
Data Sheet