cxa1202q-z Sony Electronics, cxa1202q-z Datasheet - Page 17

• Manufacturer Part Number: cxa1202q-z
• Description: Rec/pb Amplifier For Vcr
• Manufacturer: Sony Electronics

Description of Operations
The functional blocks, voltage supply and GND pins of CXA1202Q-Z and CXA1202R are configured as follows:
Individual blocks are described in the following paragraphs.
[Mix AMP + SW]
Here, each of Y, Chroma, AFM, ATF and PCM signals is input at a prescribed input level so that they are
mixed together internally to achieve an appropriate current value at the head, and output to MIX1 OUT pin
(CH1 signal) and MIX2 OUT (CH2 signal) at a correct timing.
Control is possible at ATF LEVEL pin (0 to 3dB at 0 to 5V, OPEN not allowed) when only the ATF recording
level is to be increased as required, and at ME LEVEL pin (0 to 3dB at 0 to 5V, OPEN not allowed) when only
the low range signal (Chroma + AFM + ATF) recording level is to be increased.
In MULTI PCM mode, the ATF recording level is boosted by 6dB.
In SW, the signal is output to MIX1 OUT and MIX2 OUT pins under control of the control logic section.
[REC AMP]
Mix AMP + SW output is input after it is converted into a suitable current by an external resistor, to drive the
head. Adjustment of the external resistor makes it possible to set a gain and DC bias current to match that of
the head.
Feedback dumping is applied to inhibit head resonance (refer to the Application Circuit), and take care that
capacitance coupling will not occur across the input and output.
Control signals of RP PB EN, RP PB 1CH and RP PB 2CH permit power saving in the channels while
recording (refer to the Control Logic Truth Table). Power saving of about 85mW is possible through a single
channel.
Mix AMP + SW section
REC AMP section
Head AMP section
Medium range frq. compensation
circuit + SW section
RF AGC section
RF SW section
Dropout detecting section
Control logic section
Standard voltage supply section in IC
(VREG, VG)
Block name
CH1
CH2
CH1
CH2
7, 17 (Output emitter follower section)
7, 17 (Output emitter follower section)
7, 17 (Peak hold section)
Voltage supply pin
– 17 –
27
34
27
34
7
7
7
7
CXA1202Q-Z/CXA1202R
GND pin
43
21
40
21
40
19
19
19
19
43
43