PIN

NAME

TYPE

FUNCTION

37

FLTCAP1P

Analog Out

Dedicated external filter capacitor #1.

38

FLTCAP1N

39

FLTCAP2P

Analog Out

Dedicated external filter capacitor #2.

40

FLTCAP2N

41

AVDD18

Supply

+1.8V DC Supply Voltage for analog circuits.

42

AVDD18

Supply

+1.8V DC Supply Voltage for analog circuits.

43

FLTCAP3P

Analog Out

Dedicated external filter capacitor #3.

44

FLTCAP3N

45

XTALI

Analog In

Crystal Input. For standard internal clock, connect crystal or ceramic resonator

from XTALI to XTALO. May alternatively be driven by an external clock.

46

XTALO

Analog Out

Crystal Output. Excitation driver for crystal or ceramic resonator.

47

AVDD18

Supply

+1.8V DC Supply Voltage for analog circuits.

48

DVDD18

Supply

+1.8V DC Supply Voltage for digital circuits.

49

RESETN

Digital In

Reset when "Low". Has internal pull-up to DVDD33.

50

WDTENB

Digital In

Watch Dog Timer Enable. WDTENB enabled when high. Has internal

pull-up to DVDD33. See applications schematic for further details.

51

SCLK

Digital In

SPI clock. Has internal pull-down to GND.

52

SSN

Digital In

SPI slave select enabled "Low". Has internal pull-up to DVDD33.

53

SDI

Digital In

SPI slave data input to RFPAL. Has internal pull-down to GND.

54

SDO

Digital Out

SPI slave data output from RFPAL. Tri-state. DVDD33 logic.

55

DVDD18

Supply

+1.8V DC Supply Voltage for digital circuits.

56

DGPIN1

Digital In

Digital General Purpose Input 1. Has internal pull-up to DVDD33. See

Firmware Release Notes for further details.

57

STATO

Digital Out

General Purpose Status Output as defined in Firmware Release Notes.

Open-drain output with internal pull-up to DVDD33.

58

DVDD33

Supply

+3.3V DC Supply Voltage for digital circuits.

59

DVDD18

Supply

+1.8V DC Supply Voltage for digital circuits.

60

LOADENB

Digital In

Load Enable. Required for FW upgrades. Has internal pull-down to GND.

See applications schematic for further details.

61

TESTSEL1

Reserved

Do not connect. Reserved for internal use.

Has internal pull-down to GND.

62

TESTSEL2

Reserved

Do not connect. Reserved for internal use.

Has internal pull-down to GND.

63

DGPIN0

Digital In

Digital General Purpose Input 0. Do not connect. Reserved for future use.

Has internal pull-down to GND. See applications schematic for further details.

64

DVDD18

Supply

+1.8V DC Supply Voltage for digital circuits.

65

GNDPAD

Supply

Common Ground for entire integrated circuit. Also provides path for thermal

dissipation.

SC1894

225MHz to 3800MHz RF Power

Amplifier Linearizer (RFPAL)

www.maximintegrated.com

Maxim Integrated │ 15

Pin Description (continued)