ADRF6601

Rev. 0 | Page 8 of 24

Pin No.

Mnemonic

Description

27

VCC_V2I

Power Supply. Power supply voltage range is 4.75 V to 5.25 V. Each power supply pin should be decoupled

with a 100 pF capacitor and a 0.1 μF capacitor located close to the pin.

29

IP3SET

Connect a resistor from this pin to a +5 V supply to adjust IIP3. Normally leave open.

32, 33

NC

No Connection.

36

LODRV_EN

LO Driver Enable. Together with Pin 16 (PLL_EN), this digital input pin determines whether the LOP and LON

pins operate as inputs or outputs. LOP and LON become inputs if the PLL_EN pin is low or if the PLL_EN pin is

set high with the PLEN bit (DB6 in Register 5) set to 0. LOP and LON become outputs if either the LODRV_EN pin

or the LDRV bit (DB3 in Register 5) is set to 1 while the PLL_EN pin is set high. The external LO drive frequency

must be 1× LO. This pin should not be left floating.

37, 38

LON, LOP

Local Oscillator Input/Output. The internally generated 1× LO is available on these pins. When internal LO

generation is disabled, an external 1× LO can be applied to these pins.

39

VTUNE

VCO Control Voltage Input. This pin is driven by the output of the loop filter. The nominal input voltage range

on this pin is 1.5 V to 2.5 V.

40

DECLVCO

Decoupling Node for the VCO LDO. Connect a 100 pF capacitor and a 10 μF capacitor between this pin and

ground.

EP

EPAD

Exposed Paddle. The exposed paddle should be soldered to a low impedance ground plane.