TZA1032UK Philips Semiconductors, TZA1032UK Datasheet - Page 8

• Manufacturer Part Number: TZA1032UK
• Description: Laser driver and controller circuit
• Manufacturer: Philips Semiconductors

Philips Semiconductors
2002 May 06
AMEAS
LASP
AEZ
V
SCL
SDA
RDWR
ES
ES
FS
V
V
V
V
OUT1
OUT2
OUT3
Laser driver IC test pads
TEST2
TEST1
TEST0
DDD2
DDA3
SSD2
SSA3
DD1
Laser driver and controller circuit
SYMBOL
PAD
34
35
37
38
40
41
42
43
44
45
46
47
48
49
50
51
52
5
6
7
TYPE
I/O
O
O
O
O
O
O
O
P
P
P
P
P
I
I
I
I
I
I
I
alpha measure; analog current sink input. AMEAS (alpha measure) is the
value of the measured disk writing quality. This is used in the alpha control
loop in order to regulate the actual laser power as a function of non-laser
system and medium drift.
laser power; analog current source output. Pin LASP indicates the laser power
level. The read power is constant and the write power level (which is added
during laser driver write mode) is alpha corrected. This signal is used in order
to normalise signals with respect to laser power.
alpha error zero; digital input with pull-down resistor. Depending on the
programming of an internal mode bit one of two effects occurs when this input
is asserted.
IC digital power supply
digital input for I
digital bi-directional port with open-drain sink output for I
read-write; digital output line. This signal indicates whether the laser driver is
in read mode (HIGH) or write mode (LOW).
analog output line. This signal indicates when valid signals from the
photo-detector can be expected for sampling purposes (used in CD-R
applications).
analog output line. The ES anti-phase signal used together with ES to allow
balanced transmission.
forward sense; analog current sink input. This is the value of the measured
laser power (e.g. measured by a photodiode which receives a set fraction of
laser output directly). This is used in the laser power control loop in order to
regulate the actual laser power to a given set of values as a function of laser
temperature drift.
IC analog power supply
IC digital ground
IC analog ground
laser driver power supply
analog current output to the laser
analog current output to the laser
analog current output to the laser
digital input bus for test mode control. Normal functional mode (normal
application use) is: all pins with an internal pull-down resistor and code = 0.
digital input bus for test mode control. Normal functional mode (normal
application use) is: all pins with an internal pull-down resistor and code = 0.
digital input bus for test mode control. Normal functional mode (normal
application use) is: all pins with an internal pull-down resistor and code = 0.
alpha error zero (AEZ): the output of the alpha error adder is forced to zero.
alpha set zero (ASZ): the alpha error adder positive input (i.e. the alpha set
point) is forced to zero.
2
C-clock (the laser driver is a slave device)
8
DESCRIPTION
Preliminary specification
2
C-bus data
TZA1032