1999 Sep 17
2
Philips Semiconductors
Preliminary specification
Analog current buffer for CD-R and CD-RW
systems
TZA1027
FEATURES
Eight amplifiers for servo and power calibration
functions
Gain selector for CD-R and CD-RW discs
Separate data amplifier for read speed up to thirty times
nominal data speed.
GENERAL DESCRIPTION
The TZA1027 is an analog current buffer IC for CD-R and
CD-RW systems with a 3-spot push-pull tracking system.
The IC interfaces directly to the photo diodes and
TZA1020. A HF current amplifier is implemented to detect
the actual HF data signal.
QUICK REFERENCE DATA
ORDERING INFORMATION
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
V
DD
supply voltage
4.5
5.0
5.5
V
I
i(cd)
central diode input current
WRON = 1
0
-
3400
A
I
i(sd)
satellite diode input current
WRON = 1
0
-
520
A
B
CAHF
bandwidth
C
i
= 5 pF
72
-
-
MHz
t
d(f)
flatness delay
C
i
= 5 pF; f = 0.1 to 32 MHz
-
30
200
ps
G
SS
servo satellite detector gain
HG = 1
-
32
-
HG = 0
-
8
-
T
amb
ambient temperature
0
-
70
C
TYPE
NUMBER
PACKAGE
NAME
DESCRIPTION
VERSION
TZA1027HL
LQFP32
plastic low profile quad flat package; 32 leads; body 5
5
1.4 mm
SOT401-1
1999 Sep 17
4
Philips Semiconductors
Preliminary specification
Analog current buffer for CD-R and CD-RW
systems
TZA1027
PINNING
SYMBOL
PIN
DESCRIPTION
C1
1
central photo diode current input
A2
2
satellite diode current input
B2
3
satellite diode current input
C4
4
central photo diode current input
C3
5
central photo diode current input
B1
6
satellite diode current input
A1
7
satellite diode current input
C2
8
central photo diode current input
n.c.
9
not connected
n.c.
10
not connected
n.c.
11
not connected
n.c.
12
not connected
AGND
13
analog ground
DGND
14
digital ground
V
DDD
15
digital power supply
V
DDA
16
analog power supply
n.c.
17
not connected
HFGND
18
ground connection of CAHF output stage
CAHF
19
central aperture high-frequency output
n.c.
20
not connected
PDWN
21
digital input power-down
C2LF
22
C2 central detector signal output
A1LF
23
A1 satellite detector signal output
B1LF
24
B1 satellite detector signal output
C3LF
25
C3 central detector signal output
C4LF
26
C4 central detector signal output
B2LF
27
B2 satellite detector signal output
A2LF
28
A2 satellite detector signal output
C1LF
29
C1 central detector signal output
HG
30
digital input high gain selection
WRON
31
digital input write on gain selection
n.c.
32
not connected