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UX-M55
TA2153FN (IC704) : RF amplifier for digital servo CD system
1. Terminal layout
VCC
1
30
RFN2
RFAGC
2
29
GND
GMAD
3
28
RFO
FNI
4
27
AGCIN
FPI
5
26
GVSW
TPI
6
25
RFGO
TNI
7
24
RFRPIN
MDI
8
23
PKC
LDO
9
22
RFCT
SEL
10
21
BTC
TEB
11
20
RFRP
2VRO
12
19
VRO
TEN
13
18
SEB
TEO
14
17
FEN
SBAD
15
16
FEO
3. Pin function
Pin No.
Symbol
I/O
1
VCC
2
RFAGC
3
GMAD
4
FNI
5
FPI
6
TPI
7
TNI
8
MDI
9
LDO
O
10
SEL
11
TEB
12
2VRO
O
13
TEN
14
TEO
O
15
SBAD
O
16
FEO
O
17
FEN
1-30
2. Block diagram
30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
-
+
1
2
-
Power supply input terminal
I
RF amplitude adjustment control signal input terminal. Controlled by 3-PWM
signals. (PWM carrier = 88.2kHz)
I
Open loop gain adjustment terminal for AGC amplifier
I
Main beam I-V amplifier input terminal
I
Main beam I-V amplifier input terminal
I
Sub beam I-V amplifier input terminal
I
Sub beam I-V amplifier input terminal
I
Monitor photo diode amplifier input terminal
Laser diode amplifier input terminal
I
Laser diode control signal input terminal and APC circuit ON/OFF control signal
terminal
SEL level
APC circuit
GND
OFF
Hiz
ON
Vcc
ON
I
Tracking error balance adjustment signal input terminal. Controlled by 3-PWM
signals. (PWM carrier = 88.2kHz)
Reference voltage (2VRO) output terminal
I
TE amplifier negative input terminal
TE error signal output terminal
Sub beam adder signal output terminal
Focus error signal output terminal
I
FE amplifier negative input terminal
3
4
5
6
7
8
9
10 11 12 13 14 15
Function
LDO
Connected to Vcc through
resistor (1kohm)
Control signal output
Control signal output
2RVO = 4.2V when Vcc = 5V
-
+
Detect frequency
Low
Low
High
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