Pin Description (continued)

PIN

NAME

FUNCTION

TYPE

34

FLTCAP0

N

Dedicated External Filter Capacitor #0.

Analog

Out

35, 36

AVDD18

+1.8V DC Supply Voltage for Analog Circuits.

Supply

Supply

37

FLTCAP1

P

Dedicated External Filter Capacitor #1.

Analog

Out

38

FLTCAP1

N

Dedicated External Filter Capacitor #1.

Analog

Out

39

FLTCAP2

P

Dedicated External Filter Capacitor #2.

Analog

Out

40

FLTCAP2

N

Dedicated External Filter Capacitor #2.

Analog

Out

41, 42

AVDD18

+1.8V DC Supply Voltage for Analog Circuits.

Supply

Supply

43

FLTCAP3

P

Dedicated External Filter Capacitor #3.

Analog

Out

44

FLTCAP3

N

Dedicated External Filter Capacitor #3.

Analog

Out

45

XTALI

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

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

Analog In

46

XTALO

Crystal Output. Excitation driver for crystal or ceramic resonator.

Analog

Out

47

AVDD18

+1.8V DC Supply Voltage for Analog Circuits.

Supply

48

DVDD18

+1.8V DC Supply Voltage for Digital Circuits.

Supply

49

RESETN

Active-Low Reset Input. Has internal pullup to DVDD33.

Digital In

50

WDTENB

Watch Dog Timer Enable. WDTENB enabled when high. Has internal pullup to DVDD33.

See applications schematic for further details.

Digital In

51

SCLK

SPI Clock. Has internal pulldown to GND.

Digital In

52

SSN

SPI Slave Select Enabled "Low". Has internal pullup to DVDD33.

Digital In

53

SDI

SPI Slave Data Input to RFPAL. Has internal pulldown to GND.

Digital In

54

SDO

SPI Slave Data Output from RFPAL. Tri-state. DVDD33 logic.

Digital Out

55

DVDD18

+1.8V DC Supply Voltage for Digital Circuits.

Supply

56

DGPIN1

Digital General Purpose Input 1. Has internal pullup to DVDD33. See Firmware Release

Notes for further details.

Digital In

57

STATO

General Purpose Status Output, as Defined in Firmware Release Notes. Open-drain output

with internal pullup to DVDD33.

Digital Out

58

DVDD33

+3.3V DC Supply Voltage for Digital Circuits.

Supply

59

DVDD18

+1.8V DC Supply Voltage for Digital Circuits.

Supply

60

LOADENB

Load Enable. Required for FW upgrades. Has internal pulldown to GND. See applications

schematic for further details.

Digital In

61

TESTSEL

1

Do Not Connect. Reserved for internal use. Has internal pulldown to GND.

Reserved

SC1905

698MHz to 3800MHz RF Power Amplifier Linearizer

(RFPAL)

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