72
NX-420
SCHEMATIC DIAGRAM
X57-837 5/8
AE
AF
AG
AH
AI
-t
PLD
ASSIST
ASQAPC
CV
TEMP
SDO1
PCK_RF
PLLMOD
/PCS_RF
/SAVE
RXC
TXC
SBC
BATT
/BINT
/PSW
DDCLK
33C
33C
THP
50R
50CS
50C
50C
50C
50C
50C
50C
R400
10
C406
0.01u
C403
0.01u
X400
1
2
GND1
GND2
3
oUTPUT
4
VCC
C402
10p
R401
1k
C404
10p
L401
4.7u
C401
100p
C418
100p
L403
C424
100p
R415
10
C416
100p
C423
0.1u
C417
100p
R412
1k
R409
10
R405
10
C412
0.01u
C426
100p
C414
0.01u
C411
0.01u
C425
0.1u
C428
100p
C422
100p
R420
0
C431
0.15u
35
R421
120
C433
10u
20
R422
390
R410
47k
C419
100p
C P 4 0 0
10X4
IC400
SKY72310-362
7
NC
8
OSC_AC_GND
9
OSCin
10
OSCout
11
VCC_OSC
12
GND_OSC
13
NC_1
14
NC_2
15
NC_3
16
NC_4
17
NC_5
18
NC_6
19
VCC_digital
20
DATA
21
CS
22
CLOCK
23
MODin
24
MUXout
1
VCC
2
Fin
3
Fin
4
LD/PS
5
VCCcp
6
CPout
25
GND
.
CN400
.
R416
10M
.
C435
100p
.
C429
100p
.
C421
100p
.
C415
100p
.
R414
47k
.
D400
DA221
.
IC401
XC221A1200MRG
1
2
3
VoUT
VDD
IN+
4
IN-
5
VSS
.
R423
47k
.
R417
470k
.
C438
0.1u
.
R408
1k
.
C432
0.1u
.
R424
68k
.
R524
2.7k
.
C554
1000p
.
C545
100p
.
C553
1u
2SA1955A-F
.
Q504
.
D505
1SS388F
.
R520
470k
.
R532
1k
.
R526
470k
.
R430
220k
.
R432
18k
.
C437
1000p
.
R428
1k
.
R431
120k
C405
1000p
C427
100p
R411
47
.
C444
100p
TH400
100k
C400
0.01u
L 4 0 0
.
R433
2.2k
.
R426
100k
.
R531
0
.
C546
100p
.
C563
100p
.
C439
100p
.
C548
0.1u
.
C550
0.1u
C413
100p
R407
0
.
C420
100p
.
R413
39k
.
R418
10M
.
C445
0.1u
L404
R419
0
C430
0.01u
C410
10p
R425
10k
C436
0.047u
16
C496
100p
.
Q509
LTC014EEBFS8
.
Q502
LTC014EEBFS8
C407
100p
.
Q 5 0 3
E M 6 M 1
.
R406
0
.
IC402
BU7462NUX
1
2
3
4
VSS
5
6
7
8
VDD
.
Q 5 0 5
E M D 5
-
-
+
+
+
CV
-
VCO_MOD
PTT
+B
33A
50CS
50CS
VCO_MOD
PTT
+B
50R
33A
THP
50T
TCXO(16.8MHz) Out
Assist Fil Out
APC
Fin
LIMITTER
BYPASS
PLL SYSTEM
DC AMP(ASSIST)
Q504 CONT
DC SW (50CS)
DC SW (50T)
DC SW (50R)
SW
DC AMP (CV/APC)
R:0V
T:4.
88
V
R:0V
T:3.2
8
V
R:4.
8
5V
T:0V
R:3.23V
T:0V
3.3V
4.95V
TX-RX UNIT (X57-8370-10)
Summary of Contents for NX-420 K
Page 80: ...NX 420 ...