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EN 32
7.
TPM8.31A LA
7.4.8
Audio Mute circuit
This circuit will provide a "high-to-low" pulse when the +5 V
SSB power line goes low. This will trigger the related audio
mute circuit, preventing the audio circuit making uncontrolled
sounds.
R601
100K 1/10W 5%
ZD601
BZX84C3V6
3
1
C684
R611
10uF 10V
470KOHM +-5% 1/10W
7.4.9
AV33 and DV33 (U701)
The circuit around U701 will provide the main 3.3 V power
supply to the SSB.
5V_SW
FB715
120R/6000mA
C718
C719
C717
100N 16V
10uF 10V
NC/22uF 10V
7.4.10 Tuner
The tuner covers as followed:
•
VHF LOW BAND: from 49.75 MHz to 144.25 MHz.
•
VHF HIGH BAND: from 1526.25 MHz to 448.25 MHz.
•
UHF BAND: from 456.25 MHz to 863.25 MHz.
2
I
C bus control of tuner, address selection.
7.5
Front-End Analogue and reception
7.5.1
Front-End Analogue
The Front-End for the analogue tuner consist of the following
key components:
•
F86WT-2-E
•
MT5301BCMU
2012-Jun-08
Circuit Descriptions
+5V_ON
R602
R603
NC 10K 1/16W 5%
1.8KOHM 1/10W
MUTE_CTL
Q601
BC847C
3
1
Q603
NC PDTC114ET
2
Figure 7-11 Audio Mute circuit
3V3 Main Power
U701
TPS54319RTE
16
VIN
PH
1
VIN
PH
2
VIN
PH
15
EN
BOOT
6
VSNS
PWRGD
7
COMP
GND
8
RT/CLK
GND
R728
9
SS
AGND
R729
C738
0.1UF 16V
C713
3.3nF 50V
Figure 7-12 AV33 and DV33 (U701)
R608
1.8KOHM 1/10W
R607
D601
LL4148
100R 1/16W 5%
D602
LL4148
L701
1.5UH
10
C720
11
22uF 10V
12
C799
13
R730
0.1UF 16V
14
TP708
300R 1/16W 1%
3
R772
4
100K 1/16W 5%
5
R767
100K 1%
R766
33K 1%
Below find a block diagram of the front-end application for
analogue tuner.
F86WT-2-E
Figure 7-13 Front-End analogue block diagram
back to
div. table
FB601
2
120R/6000mA
R609
10K 1/16W 5%
POP_MUTE
Q602
BC847C
R610
4K7 1/16W 5%
3V3_BUCK
3V3_BUCK
C721
22uF 10V
C7001
100N 16V
3V3_BUCK
TCL
2
I
C
I
2
C
IF
RF AGC
IF AGC
5V_SW
1
19170_215_110705.eps
110718
DVDD3V3
FB716
1
2
120R/3000mA
C722
1UF 10V
AVDD3V3
FB717
1
2
120R/3000mA
C723
1UF 10V
19170_209_110705.eps
110705
MT5301B
19320_203_120601.eps
120601
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