Hytera MD78X Service Manual page 492

5
R572 R572
D
Ref
4.7k 4.7k
R573 R573 R570 R570
5.1k 5.1k
5.6k 5.6k
8 OUT OUT 1
VCC VCC
1kR569 1k R569
7 OUT OUT + + - - IN- IN- 2
6 IN+ IN+ 3
IN- IN-
R575 R575 Ref
- - + +
R577 R577
5.1k 5.1k
5 4
VEE VEE
IN+ IN+
5.1k 5.1k
C475 C475 OPAMP OPAMP
C406 C406
U501 U501
4.7n 4.7n
4.7n 4.7n
C
B
A
5
4
MD78X/MD78XG Schematic Diagram (DAC Circuit)
5VA
L500 L500
BLM18PG600SN1 BLM18PG600SN1
2 1
C471 C471 C405 C405
+ +
5VA
0.1u 0.1u 10uF/10V 10uF/10V
R542 0 R542 0
C508 C508
10u/10V 10u/10V
1k R576 1k R576
Ref
R568 5.1k R568 5.1k
C403 C403
C404 C404
4.7n 4.7n
4.7n 4.7n R574 R574
NC NC
C525 C525
C500 C500
nc nc
R578 R578 33p 33p
R500 R500
0 0 100K 100K
MOD_H
R505 R505
MOD_L_RFCS
C503 C503
1800PF 1800PF
3V3D
R508 0 R508 0
DAC_DIN
DAC_SCLK
DAC_FS
4
3
C509 C509
+ +
C510 C510
R528 R528
0.1u 0.1u 100P 100P
68K 68K
R513 R513
100K 100K
C502 C502
C501 C501
3300p 3300p
330p 330p
R501 R501 R502 R502
10K 10K 1K 1K
R507 R507
R506 R506
R514 100K R514 100K
0 0 10K 10K 0 0
C505 C505
C514 0.1u C514 0.1u
C504 C504
NC NC
nc nc
U500 U500
D/A IC D/A IC
C512 C512 R509 10k R509 10k
+ +
C511 C511 C513 C513
10u/10v 10u/10v
0.1u 0.1u
1000P 1000P R512 10k R512 10k
R510 10k R510 10k
1 8
2 7
3 6
4 5
RN500 33*4 RN500 33*4
C516 C516 C517 C517 C518 C518
100P 100P 100P 100P 100P 100P
3
479
2
R503 1K R503 1K R564 0 R564 0 R566 0 R566 0
R504 1K R504 1K R565 0 R565 0 R567 0 R567 0
C506 C506 C507 C507 C521 C521 C522 C522
0.01uF 0.01uF 0.01uF 0.01uF NC NC NC NC
DESIGNER LHY
Title Title Title
<Title> <Title> <Title> DAC
Size Size Size Document Number Document Number Document Number
B B B <Doc> <Doc> <Doc>
Date: Date: Date: Monday, November 29, 2010 Monday, November 29, 2010 Monday, November 29, 2010
2
1
Final_bias
TV_APC
C523 C523 C524 C524
NC NC NC NC
Rev Rev Rev
<RevCode> <RevCode> <RevCode>
Sheet Sheet Sheet 2 2 2 of of of 14 14 14
1
D
C
B
A