TZA1020 Datasheet, PDF (3/36 Pages) NXP Semiconductors – Pre-amplifiers for CD-RW systems

Philips Semiconductors
Pre-amplifiers for CD-RW systems
Product specification
TZA1020; TZA1020A
1 FEATURES
• Data amplifier for read speed up to twelve times nominal
data speed
• Normalized and filtered error signals for servo control
• Wobble pre-processor with switchable low-pass filter
• Calculation of signals for real-time laser power control
for write speed up to four times
• Calculation of signals for optimum laser calibration for
write speed up to four times
• Fast track count amplifier
• Spot position measurement for alignment of photo
diodes
• Reference voltage for laser controller
• On-chip band gap and DACs for accurate and
adjustable current/gain settings
• I²C-bus microcontroller interface for programmable
gain, speed switching and function selection
• All functions available for CD-R and CD-RW systems.
2 GENERAL DESCRIPTION
TZA1020 (AEGER2) is an analog pre-processor IC for
CD-R and CD-RW systems with 3-spots push-pull tracking
system. The IC interfaces directly to the photo diodes.
The device generates signals for laser power calibration
and laser power control during disc writing. Normalized
error signals are generated for servo control and wobble
detection. An HF current amplifier is implemented to
detect the actual HF data signal. The Fast Track Count
(FTC) amplifier generates a radial error signal to allow fast
track counting.
TZA1020A (AEGER2A) is similar to the TZA1020, except
for non-clamped MIRN, which allows operation with
IGUANA.
3 QUICK REFERENCE DATA
SYMBOL
V_DD
V_SS
I_i(cd)
B_{−3dB(norm)}
B_{−3dB(CAHF)}
∆t_d(g)(CAHF)
G_I(CAHF)
I_RREF
T_amb
PARAMETER
positive supply voltage
negative supply voltage
central diode input current range
−3 dB bandwidth normalized
error signals (servo)
−3 dB bandwidth pin CAHF
group delay variations pin CAHF
current gain pin CAHF
reference current
ambient temperature
CONDITIONS
C_i = 12 pF
f = 0.1 to 12 MHz;
C_i = 12 pF
cdrwsel = 1
cdrwsel = 0
MIN.
4.5
−5.5
0
48
TYP.
5.0
−5.0
−
60
MAX.
5.5
−4.5
4 000
−
UNIT
V
V
µA
kHz
17
−
−
−
−
MHz
0.9
ns
−
35
−
−
8.75 −
−
−900 −
µA
0
−
70
°C
4 ORDERING INFORMATION
TYPE
NUMBER
TZA1020HP;
TZA1020HP/A
NAME
QFP44
PACKAGE
DESCRIPTION
plastic quad flat package; 44 leads (lead length 1.3 mm);
body 10 × 10 × 1.75 mm
VERSION
SOT307-2
2000 Oct 30
3