Hytera MD78X Service Manual page 420

5
D
C483 C483
8200p 8200p
R575 R575 R577 R577
2.7k 2.7k
6.8k 6.8k
C
B
A
5
4
MD78X/MD78XG Schematic Diagram (DAC Circuit)
5VA
L500 L500
BLM18PG600SN1 BLM18PG600SN1
2 1
C471 C471 + + C405 C405
0.1u 0.1u 10uF/10V 10uF/10V
R570 R570
10k 10k
C484 C484 1000p 1000p
8 OUT OUT 1
VCC VCC
7 + + - - IN- IN- 2
OUT OUT
R574 R574
R568 R568
12k 12k
NC NC
6 IN- IN- IN+ IN+ 3
- - + +
C404 C404
5 4
VEE VEE
1000p 1000p
IN+ IN+
C406 C406
OP AMP OP AMP
1200p 1200p
U501 U501
C500 C500
33p 33p
MOD_H
MOD_L_RFCS
3V3D
4
3
5VA
R542 0 R542 0
C509 C509
+ +
C508 C508
C510 C510
R528 R528
0.1u 0.1u 100P 100P
10u/16v 10u/16v
68K 68K
C502 C502
C501 C501 3300p 3300p
330p 330p
R500 R500 R501 R501
R502 R502
10K 10K
100K 100K 1K 1K
R505 R505 R507 R507
R506 R506
0 0 0 0
10K 10K
C505 C505
C503 C503
C504 C504
1800PF 1800PF NC NC
nc nc
R508 0 R508 0
C512 C512
+ +
C511 C511 C513 C513
10u/16v 10u/16v
0.1u 0.1u 1000P 1000P
R510 10k R510 10k
1 8
2 7
DAC_DIN
3 6
DAC_SCLK
4 5
DAC_FS
RN500 33*4 RN500 33*4
C516 C516 C517 C517
100P 100P 100P 100P
3
407
2
R513 R513
100K 100K
R503 1K R503 1K R564 0 R564 0
R504 1K R504 1K R565 0 R565 0
C506 C506 C507 C507 C521 C521
0.01uF 0.01uF 0.01uF 0.01uF NC NC
R514 100K R514 100K
C514 0.1u C514 0.1u
U500 U500
D/A IC D/A IC
R509 10k R509 10k
R512 10k R512 10k
C518 C518
100P 100P
Title Title Title
Size Size Size
B B B
Date: Date: Date:
2
1
R566 0 R566 0
Final_bias
R567 0 R567 0
TV_APC
C522 C522 C523 C523 C524 C524
NC NC NC NC NC NC
<Title> <Title> <Title>
Document Number Document Number Document Number Rev Rev Rev
<Doc> <Doc> <Doc>
Monday, November 29, 2010 Monday, November 29, 2010 Monday, November 29, 2010 Sheet Sheet Sheet 2 2 2 of of of 14 14 14
1
D
C
B
A
<RevCode> <RevCode> <RevCode>