TDA8808T Datasheet, PDF (2/22 Pages) NXP Semiconductors – Photo diode signal processor for compact disc players

Philips Semiconductors
Photo diode signal processor for
compact disc players
Product specification
TDA8808T
TDA8808AT
GENERAL DESCRIPTION
The TDA8808 is a bipolar integrated circuit designed for use in compact disc players with a single spot read-out system.
It amplifies the photo-diode signals and processes the error signals for the focus- and radial control network.
Features
• Data amplifier with equalizer and AGC
• Offset-free pre-amplifier with AGC for the servo signals
• Trackloss and drop-out detection
• Start-up procedure for focus
• Normalizing focus error output signal to minimize radial error interference
• Laser supply amplifier and reference source
• Both TDA8808T and TDA8808AT versions suitable for car, portable and home applications
• Single and dual supply application
• Focus in-lock signal; ready signal output (RD).
QUICK REFERENCE DATA
SYMBOL
PARAMETER
V_P
V_ext
V_ext
I_Q
I_HFin(p-p)
I_D
I_LO
T_amb
Supply
Supply voltage range
External voltage range
TDA8808T
TDA8808AT
Quiescent supply current
HF input current
(peak-to-peak value)
LF input current
(for each diode input)
Laser supply output current
Operating ambient
temperature range
CONDITIONS
MIN.
TYP. MAX. UNIT
4,5
5,0
5,5
V
Si/RD = 0 V
−5,5
−5,0
0
V
V_P
10
12
V
7,5
10
12,5
mA
f_HFin = 100 kHz
3
−
10
µA
0
−
6
µA
Si/R7D = HIGH Z −8
−4
−2
mA
−30
−
+85
°C
PACKAGE OUTLINE
28-lead mini-pack; plastic (SO28; SOT136A); SOT136-1; 1996 August 13.
November 1987
2