1 2 3 4 5 6
1 2 3 4 5 6
A
B
C
D
A
B
C
D
Date: 2019-11-20
KiCad E.D.A. kicad 5.1.5+dfsg1-2build2
Rev: 0.1Size: A4
Id: 1/1
Title: Feather RF Signal Generator
File: rf-sig-gen.sch
Sheet: /
Josh Johnson
R3
0R0
C18
100p
C17
10n
GND
C32
8p2
FB3
600R
GND
+3.3VA
R11
18K
GND
R12
52R3
C38
47n
C33
47n
R2
0R0
GND
R16
1K
+3.3VA
GND
R5
90R9
R6
31R1
C23
100n
C24
12n
INHI
1
GND
2
CLPF
3
VSET
4
VOUT
5
TADJ
6
VPOS
7
INLO
8
EP
9
U6
AD8319
GND
GND
GND
1
2
J2
SMA
C40
1n
R18
10K
R19
1K
GND
D3
LED
GND
C9
100p
C8
10n
GND
C11
100p
C10
10n
FB4
600R
VBUS
GND
FB1
600R
GND
C13
100p
C12
10n
FB2
600R
+3.3VA
C37
1n
R14
500R
GND
GND
C16
100p
C15
10n
C42
100p
C41
100n
+3.3VA
C19
1u
C39
1n
R17
49R9
GND
C28
100p
OUT
1
NC
2
PG
3
EN
4
GND
5
IN
6
EP
7
U2
LP5912
VBUS
C27
100n
+3.3VA
GND
C14
1u
GND
GND
GND
+3.3VA
+3.3VA
VIN
1
GND
2
EN
3
VOUT
5
U3
MIC5366-1.8
GND
GND
C25
1u
+3.3VA
+1V8
+3.3VA
nP/S
1
GND
10
VDD
18
GND
8
GND
9
GND
11
GND
12
RF2
13
GND
14
SDO
15
PUP1
17
D5
19
CLK
2
D4
20
D3
21
D2
22
D1
23
D0
24
SDI
3
LE
4
GND
5
RF1
6
GND
7
PUP2
16
EP
25
U4 SKY12347-362LF
GND
C21
1u
GND
+3.3VA
VCC
1
RFIN
2
NC
3
NC
4
PWDN
5
NC
6
RFOUT
7
NC
8
EP
9
U5
TRF37A75
C35
10n
C26
DNP
R7
DNP
GND
R8
240R
GND
C29
820p
C36
10p
R15
1R8
GND
L1
100n
GND
GND
C5
10n
R4
49R9
C20
100p
GND
GND
C31
10n
+3.3VA
R13
49R9
C34
100p
C30
1n
GND
C22
1n
GND
D7
LED
GND
D2
LED
R10
1K
GND
+3V3
GND
GND
CLK
1
VCC_PLL
10
GND_RF
11
RFOUTA_P
12
RFOUTA_N
13
RFOUTB_P
14
RFOUTB_N
15
VCC_RF
16
GND_VCO
18
NOISE_FILT
19
DATA
2
TUNE
20
GND_TUNE
21
RSET
22
BIAS_FILT
23
REG
24
LD
25
RFOUT_EN
26
GND_DIG
27
VCC_DIG
28
REF_IN
29
LE
3
MUX
30
GND_SD
31
VCC_SD
32
GND_EP
33
CE
4
SW
5
VCC_CP
6
CP_OUT
7
GND_CP
8
GND_PLL
9
VCC_VCO
17
U1
MAX2871
GND
GND
D5
LED
D6
LED
GND
C2
1u
C3
1u
D4
LED
D8
LED
C4
1u
+3V3
R20
2K2
R1
5K1
D9
LED
D10
LED
VBUS
D11
LED
GND
C43
100n
nRST
1
IO5
10
IO6|SCK
11
IO7|MOSI
12
IO8|MISO
13
IO9|RX
14
IO10|TX
15
NC
16
IO11|SDA
17
IO12|SCL
18
IO13
19
3V3
2
IO14
20
IO15
21
IO16
22
IO17
23
IO18
24
IO19
25
VBUS
26
EN
27
VBAT
28
ARef
3
GND
4
IO0
5
IO1
6
IO2
7
IO3
8
IO4
9
J1
Feather
+3V3
GND
GND
+3.3VA
R9
1K
GND
GND
GND
1
OUT5
10
OUT6
11
OUT7
12
OE
13
SDO
14
R-EXT
15
VDD
16
SDI
2
CLK
3
LE
4
OUT0
5
OUT1
6
OUT2
7
OUT3
8
OUT4
9
U7
STP08CP05
GND
GND
GND
3
OUTPUT
4
VCC
6
XO1
ASTXR-12-19.200MHz
GND
C1
100n
C7
100p
+1V8
C6
10n
D1
LED
ATTEN_SDO
MAX_MUX
MAX_RFOUT_EN
MAX_LD
nLED_OE
PA_PWDN
LED
ATTEN_SDI
MAX_LD
RF_OUT_N
RF_OUT_P
ATTEN_CLK
MAX_RFOUT_EN
LED
MAX_DAT
ATTEN_LE
MAX_LE
MAX_LD
PA_PWDN
RF_PWR
MAX_CE
PA_PWDN
MAX_MUX
MAX_CLK
LED_SDI
SW
ATTEN_SDI
MAX_DAT
nLED_OE
ATTEN_SDO
LED_CLK
TUNE
RF_OUT_P
LED_LE
LED_LE
RF_OUT_N
RF_PWR
MAX_CE
RF_CPL
MAX_LE
MAX_CLK
LED_CLK
CP_OUT
LED_SDI
ATTEN_CLK
ATTEN_LE
MAX2871: 23.5 - 6000 MHz PLL
DNP allows ADF4351
instead of MAX2871
Amplifier
21 dB Down
Power Detector
Init: Full
Attenuation
PLL Loop FIlter
Status LEDs
Feather RF Signal Generator
Programmable Attenuator
Unused RF_N Output
Freq. LEDs
Serial
Mode
Gain = 12 dB
P1dB = +18 dBm
IP3 = +32.5 dBm
Feather Power Regulation
