Table of Contents
Advertisement
DP-7050
CIRCUIT DESCRIPTION
3. RF Amplifier : CXA1571S (X32 : 1C104)
CXA15718S
is an IC developed for compact disc play-
ers. It contains an RF amplifier for 3 spot optical pickup,
focus error amplifier, tracking error amplifier, and APC
circuit.
3-1. Block diagram
FE BIAS
TE
Pin name
Function
LD
APC LD amplifier output pin.
PD
APC LD amplifier input pin.
RF I-V amplifier inverted input pin. Current input by connecting to the photo diode A+C terminals.
RF |-V amplifier inverted input pin. Current input by connecting to the photo diode B+D terminals.
F
F I-V amplifier inverted input pin. Current input by connecting to the photo diode F terminal.
E
E |-V amplifier inverted input pin. Current input by connecting to the photo diode E terminal.
VR
CD voltage output pin of (Vcc+VEE) /2.
vce
Connected GND when using dual power supply (+).
Connected to VR (pin 9) when using a single power supply.
EO
E output of I-V amplifier.
El
E |-V amplifier feedback input pin. For E |-V amplifier gain adjustment.
TE
Tracking error amplifier output pin.
FE-BIAS
|
Bias pin on the focus error amplifier non-inverted side.
FE
Focus error amplifier output pin.
RFO
RF summing amplifier output pin.
Inverted input pin of RF amplifier. Gain of amplifier is fixed by resistor between RFO and RFI.
LD ON / OFF select pin (Vcc : ON).
14
Advertisement
Table of Contents
