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Data Sheet

ADF4350

Rev. B | Page 7 of 34

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

CLK

DATA

CPOUT

CPGND

VREF

VCOM

RSET

VTUNE

AGNDVCO

TEMP

VVCO

NOTES

1. THE LFCSP HAS AN EXPOSED PADDLE THAT

MUST BE CONNECTED TO GND.

ADF4350

TOP VIEW

(Not to Scale)

Figure 3. Pin Configuration

Table 4. Pin Function Descriptions

Pin No.

Mnemonic

Description

CLK

Serial Clock Input. Data is clocked into the 32-bit shift register on the CLK rising edge. This input is a high

impedance CMOS input.

DATA

Serial Data Input. The serial data is loaded MSB first with the three LSBs as 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 register is loaded into the register

that is selected by the three LSBs.

Chip Enable. A logic low on this pin powers down the device and puts the charge pump into three-state mode.

A logic high on this pin powers up the device depending on the status of the power-down bits.

Fast-Lock Switch. A connection must be made from the loop filter to this pin when using the fast-lock mode.

Charge Pump Power Supply. This pin is to be equal to AVDD. Decoupling capacitors to the ground plane are to

be placed as close as possible to this pin.

CPOUT

Charge Pump Output. When enabled, this provides ±ICP to the external loop filter. The output of the loop filter is

connected to VTUNE to drive the internal VCO.

CPGND

Charge Pump Ground. This is the ground return pin for CPOUT.

AGND

Analog Ground. This is a ground return pin for AVDD.

AVDD

Analog Power Supply. This pin ranges from 3.0 V to 3.6 V. Decoupling capacitors to the analog ground plane are

to be placed as close as possible to this pin. AVDD must have the same value as DVDD.

11, 18, 21

AGNDVCO

VCO Analog Ground. These are the ground return pins for the VCO.

RFOUTA+

VCO Output. The output level is programmable. The VCO fundamental output or a divided down version is available.

RFOUTA−

Complementary VCO Output. The output level is programmable. The VCO fundamental output or a divided

down version is available.

RFOUTB+

Auxilliary VCO Output. The output level is programmable. The VCO fundamental output or a divided down

version is available.

RFOUTB−

Complementary Auxilliary VCO Output. The output level is programmable. The VCO fundamental output or a

divided down version is available.

16, 17

VVCO

Power Supply for the VCO. This ranges from 3.0 V to 3.6 V. Decoupling capacitors to the analog ground plane

must be placed as close as possible to these pins. VVCO must have the same value as AVDD.

TEMP

Temperature Compensation Output. Decoupling capacitors to the ground plane are to be placed as close as

possible to this pin.

VTUNE

Control Input to the VCO. This voltage determines the output frequency and is derived from filtering the CPOUT

output voltage.

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