TDA1302T Philips Semiconductors, TDA1302T Datasheet - Page 14

• Manufacturer Part Number: TDA1302T
• Description: Data amplifier and laser supply circuit for CD player and read only optical systems
• Manufacturer: Philips Semiconductors

TDA1302_1 15 Wed Sep 14 13:30:56 1994
Philips Semiconductors
P
It is important that the V
approximately 150 A, that is why a small diode has been
applied such as the BA482. Additional adjustment may be
necessary. this depends on the matching of V
V
The advised adjustment procedure is as follows:
1. Ensure that R
2. Adjust R
Table 4 Variable resistor (R
Table 5 Further circuit properties of Fig.11.
September 1994
SLD104U
LT022MS
RLD-78MA
SF90
SF91
ROPERTIES OF CIRCUIT
be
FIGURE
PICK-UP UNIT
Data amplifier and laser supply circuit for
CD player and read only optical systems
(T1) and the permitted tolerance on the laser current.
beginning of the adjustment.
as indicated in Table 4.
(a)
(b)
(d)
(c)
ADJ
single supply voltage
only a few components are required;
2R, 1T and 1D
supply voltage independent
single supply voltage
only a few components are required;
1R, 2T and 1D
supply voltage independent
no extra adjustment necessary if T1 and T2
match
only a few components are required;
1R and 2T
supply voltage independent
no extra adjustment necessary
better power efficiency than (b)
single supply voltage
supply voltage independent
no extra adjustment necessary
no matching components required
until the voltage across R
ADJ
Sony corporation
Sharp corporation
Rohm corporation
Sanyo corporation
Sanyo corporation
has the highest impedance at the
MANUFACTURER
F
d
(D1) approaches V
IG
.11(a)
PROPERTIES
m
) voltage adjustment.
m
has the value
be
(T1) at
d
V
(D1) and
Rm
150
150
150
180
180
(mV)
15
In Figs 11(b) to 11(d) solutions have been given requiring
no adjustment. R
R
Examples of advised values applicable to Fig.11(b), (c)
and (d) are given in Table 6.
Table 6 Advised circuit values.
Note
1. Notwithstanding that the SF91 specification details an
Figures 12 and 13 give the application diagrams of the
pick-up unit of the mechanisms as previously indicated.
SLD104U
LT022MS
RLD-78MA
SF90
SF91
ADJ
PICK-UP
astigmatic detection system, TDA1301T requires a
single Foucault parameter setting.
= 12.4R
UNIT
(1)
e
/V
Rm
ADJ
Sony corporation
Sharp corporation
Rohm corporation
Sanyo corporation
Sanyo corporation
MANUFACTURER R
at P
and R
o(nom)
e
can be calculated as follows:
.
Preliminary specification
TDA1302T
620
620
620
750
750
e
( ) R
ADJ
51
51
51
51
51
(k )