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PDF TA2157F Data sheet ( Hoja de datos )
| Número de pieza | TA2157F | |
| Descripción | Digital Servo Head Amp | |
| Fabricantes | Toshiba Semiconductor | |
| Logotipo |  |
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TA2157F/FN
TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic
TA2157F,TA2157FN
Digital Servo Head Amp for CD System
TA2157F/FN is a digital servo head amp for a 3-beam pickup
used in CD systems.
Gain for RF signal generation amp can be freely set, supporting
CD-RW.
Combining with single-chip processor TC94A14F/FA/FB, a
CMOS digital servo, makes configuring CD systems simple.
Features
· Low power dissipation digital servo head amp
· Built-in amplifier for generating reference voltage (VRO)
· Built-in auto laser power control (APC) amplifier
· Built-in RF amplifier
· Built-in RF signal automatic gain control (AGC) amplifier
· Built-in gain change circuit for CD-RW
· Built-in focus error and tracking error signal amplifiers
· Built-in track count signal amplifier
· Normal-, double-, and ×4-speed operation
· 24-pin mini flat package
TA2157F
TA2157FN
Weight
SSOP24-P-300-1.00: 0.3 g (typ.)
SSOP24-P-300-0.65A: 0.17 g (typ.)
1 2002-11-21
1 page  
Pin
No.
Symbol
I/O
Function Description
TA2157F/FN
Internal Circuit
Reference voltage (VRO) output pin
14 VRO O
· VRO = 1/2 VCC when VCC = 3.3 V
14
10 kW
15 FEO O Focus error signal generation amp output pin
167 W
15
16 FEN
I
Focus error signal generation amp
negative-phase input pin
167 W
16
15 kW
VC
Signal amp output pin for track count
17 RFRP O
Combining RFRP signal and TEO signal with
TC94A14F/FA/FB configures tracking search
system.
333 W
17
3 pF
20 kW
18 RFRPIN I Signal generation amp input pin for track count
1 kW
18
VC
5 2002-11-21
5 Page 
Test Circuit
TA2157F/FN
GVSW
13
VREF/PVREF
FEI
VRO
14
FEO
15
FEN
16
RFRP/RFZI
RFRP
17
RFRPIN
18
RFGO
RFI
19
RFGC
RFGC
20
AGCIN
21
RFO
22
RFN
23
47 kW
GND
24
20 kW 20 kW
15 kW
20 kW
50 mA
12 kW
12 kW
20 kW
BOTTOM
PEAK
AGC Amp.
3 kW
3 kW
PEAK
50 kW
15 kW
40 mA
40 kW
20 kW
20 kW
20 kW
RFDC
12
TEO
11
TEN
10
TEBC
9
TEI/TEZI
TEBC
2 kW 50 kW
SEL
8
SEL
240 kW
15 pF
240 kW
15 pF
180 kW
40 pF
60 kW
60 kW
1 kW
14 kW 2 kW
1.75 kW
LDO
7
MDI
6
10 mH
k
´0.5
´2
TNI
47 kW
5
1
´0.5
´2
TPI
47 kW
4
94 kW
22 kW
94 kW
22 kW
FPI 47 kW
3
47 kW
FNI
2
VCC
1
47 kW
47 kW
LD
PD
VC
F
E
D
C
B
A
11 2002-11-21
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet TA2157F.PDF ] | |
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