cxa2002r Sony Electronics, cxa2002r Datasheet - Page 22

• Manufacturer Part Number: cxa2002r
• Description: 2-channel Recording/playback Amplifier
• Manufacturer: Sony Electronics

<Control logic block>
This IC exercises power-saving control of circuit blocks which are not in immediate need for operation. The IC
also incorporates a logic circuit for controlling a number of SWs which change inputs and outputs at
complicated timing.
The combinations of input and output in the basic operation are shown in the "Control Logic Truth Table".
<Reference voltage in the IC>
VG2 2.45V and VREG 4.15V are generated as a reference voltages used in the IC.
VG2 cannot be used outside the IC. VREG cannot also be used outside the IC except for adjusting the dropout
detection level at Pin 11 (DOCDET).
Notes on Operation
1. This IC is characterized by high-voltage gain (about 61dB in the playback system). Pay attention to the
2. When Pin 13 (EVR Vcc) is used for 5V system (4.75
3. The voltage input to the EVR adjusting pin should be proportional to the EVR Vcc voltage. Control the input
following when using the IC.
1) Use reinforced power supply and ground lines. Decouple the power supply pin with a coil and a
2) Use of a regulator power supply is recommended.
3) Connecting a capacitive load to the output may cause oscillation.
4) Take particular care not to make capacitive coupling between the head amplifier input and the playback
5) Use of decoupling capacitors is recommended between the following DC voltage input pins and GND.
6) When a decoupling capacitor is necessary for other pins (not power supply pin), it is recommended to
or larger than that of Pin 13 (EVR Vcc).
voltage in the range from 0V to 3.15V when EVR Vcc = 3.15V.
For EVR adjustment at Pin 26 (REC1CONT) and Pin 35 (REC2CONT), control the input voltage in the range
from 1.8V to 4.75V when Vcc = 4.75V, in proportion to the supply voltage Vcc; at Pin 9 (RFAGCTC), control
the input voltage in the range from 2.5V to 4.75V.
capacitor. Connect the decoupling capacitor as close to the pin as possible.
output. Also be careful not to make capacitive coupling between the recording input and the recording
amplifier output.
When the control voltage source is at high impedance, aggravation of cross talk or oscillation is feared to
occur.
connect each decoupling capacitor as close as to the pin as possible.
Pin 1 (CCONT), Pin 5 (LOWLEVEL), Pin 7 (YLEVEL)
Pin 9 (RFAGCTC) [not when time constant is connected], Pin 11 (DOCDET)
Pin 17 (MTF0), Pin 24 (MTQ), Pin 26 (REC1CONT)
Pin 35 (REC2CONT)
– 22 –
+0.5V
–0.25V
), the voltage of Pin 19 (Vcc) should be equal to
CXA2002R