Sharp XL-UH260 Service Manual - Page 94
Ic1 Vhita2157fn-1:cd Pre-amp, Block Diagram, Block Diagram Of Ic
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IC1 VHITA2157FN-1:CD PRE-AMP BLOCK DIAGRAM GVSW 13 VRO 14 20 kΩ 20 kΩ FEO 15 FEN 16 RFRP 17 RFRPIN 18 10 pF 15 kΩ 20 kΩ 50 µA 12 kΩ 12 kΩ 20 kΩ BOTTOM PEAK 40 kΩ RFGO 19 RFGC 20 AGCIN 21 AGC Amp. RFO 22 RFN 23 GND 24 3 kΩ 3 kΩ 40 kΩ PEAK 50 kΩ 15 kΩ 40 µA 40 kΩ 20 kΩ 20 kΩ 20 kΩ 10 pF 12 RFDC 11 TEO 10 TEN 9 TEBC 2 kΩ 50 kΩ 8 SEL 1.3 V 240 kΩ 15 pF 240 kΩ 15 pF 180 kΩ 40 pF 180 kΩ 40 pF 60 kΩ 60 kΩ 1 kΩ 14 kΩ 2 kΩ 7 LDO 6 MDI 1.75 kΩ k x0.5 x2 5 TNI 1 x0.5 x2 94 kΩ 22 kΩ 4 TPI 3 FPI 94 kΩ 22 kΩ 2 FNI 1 Vcc Figure 6 BLOCK DIAGRAM OF IC XL-UH260 PIN VCTRL VCC HIZ GND SEL (APC SW) APC ON APC ON APC OFF (LDO=H) TEB (TE BAL) -50% 0% +50% RFGC (AGC Gain) +12dB +6dB 0dB GVSW NORMAL PLAYBACK MODE (0dB) NORMAL MODE (0dB) CD-RW MODE (+12dB) 8 - 6
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XL-UH260
8 – 6
IC1 VHITA2157FN-1:CD PRE-AMP
BLOCK DIAGRAM
PEAK
RFDC
TEO
TEN
TEBC
SEL
LDO
MDI
TNI
TPI
FPI
FNI
Vcc
GND
RFN
RFO
AGCIN
RFGC
RFGO
RFRPIN
RFRP
FEN
FEO
VRO
GVSW
20 k
Ω
20 k
Ω
20 k
Ω
20 k
Ω
3 k
Ω
60 k
Ω
22 k
Ω
22 k
Ω
1.75 k
Ω
14 k
Ω
2 k
Ω
1 k
Ω
50 k
Ω
20 k
Ω
10 pF
40 k
Ω
15 k
Ω
50 k
Ω
20 k
Ω
20 k
Ω
2 k
Ω
40 k
Ω
1.3 V
94 k
Ω
94 k
Ω
1
x0.5
x2
x0.5
x2
k
60 k
Ω
180 k
Ω
240 k
Ω
240 k
Ω
180 k
Ω
40 pF
40 pF
15 pF
15 pF
3 k
Ω
40 k
Ω
15 k
Ω
10 pF
12 k
Ω
12 k
Ω
BOTTOM
PEAK
AGC Amp.
50
µ
A
40
µ
A
12
13
14
15
16
17
18
19
20
21
22
23
24
11
10
9
8
7
6
5
4
3
2
1
Figure 6 BLOCK DIAGRAM OF IC
PIN
V
CTRL
V
CC
SEL
(APC SW)
TEB
(TE BAL)
RFGC
(AGC Gain)
GVSW
HIZ
GND
APC ON
-50%
+12dB
+6dB
0dB
NORMAL PLAYBACK
MODE (0dB)
NORMAL MODE
(0dB)
CD-RW MODE
(+12dB)
+50%
0%
APC ON
APC OFF
(LDO=H)