ELECRAFT KX2 - KX2 Block Diagram

65
RF Board SPI
T/R Switch
KX2 Block Diagram
Rev: 02 May 2016
80m – 10m
Sin/Cos
Si5351
74VLC74
RxM
FST3257
RF Switch RF Switch
TxM
FST3253
Rx AF
Preamp
and LPF
AD8599 +
OPA2209
Tx AF Amp
OPA4376
IQ DAC
(48 kHz)
PCM1773
(SE)
IQ ADC
(48 kHz)
PCM1803A
(SE)
ADSP-
21479
DSP
Rx RF
Preamp/
Attenuators
NE46134
Tx PA
Temp
Sensor
LM20
+3.3V and +1.2V Switching Regulators
+5V, +3.3V and +1.8V Linear Regulators
(LM78L05, LM78M05, MIC5265, LP2985, LM2671,
LM2831)
PIC
18F87K22
LCD Controller
PCF85134
(6V)
FP Controls
(1 main enc, 3
small enc w/
sw, 12 sw)
KXAT2
ATU
(7L & 7C)
10W Amp
2x
RD15HVF1
SP/PH
DAC
(48 kHz)
AIC3105
Mic/Line
ADC
(48 kHz)
AIC3105
Serial I/O
(2N7002,
MMBT3904)
RECEIVE TRANSMIT
Tx & Rx
K
E
Y
SPKR Amp
TDA7052A
RF BOARD
ATU (Option)
CP BOARD
I2C
80m – 10m
ANTENNA
EEPROM
24LC512
SPI
2 Megabyte
FLASH
Boot/Data
M25PX16
(SPI)
KXIO2 Clock (Option)
PCF2123
NPIC6C596A
(SPI)
+12V Ext
MCP23S17 IO
Expanders (SPI)
PWR/SWR BRIDGE
Si5351
Temp
Sensor
LM20
`
W. Burdick, L. Johnson, R. Heineck, R. Friess
p/o CP Board