Sony CXA2002R Datasheet

– 1 –
Description
The CXA2002R is a bipolar IC developed as
recording/playback amplifiers for Hi8 VCRs.
Features
Recording/playback system
Wideband recording/playback amplifier for Hi8
Supports electronic volume (EVR) control (3V)
Recording system
Recording amplifier feedback dumping circuit and
its EVR control function facilitates printed circuit board design.
Five-input (Y, chroma, AFM, ATF and PCM) mix amplifier and EVR control function of Y and low­band recording level
Ramp circuit for the recording amplifier output bias current
Playback system
Playback amplifier feedback dumping circuit
facilitates printed circuit board design.
Middle-band compensation circuit (middle tune) and independent adjustments of the center frequency, Q and boost by EVR
RFAGC and dropout detection circuits
Absolute Maximum Ratings
Supply voltage VCC 7V
Operating temperature Topr –10 to +75 °C
Storage temperature Tstg –65 to +150 °C
Allowable power dissipation PD 1100 mW
(when mounted on the printed circuit board)
Recommended Operating Condition
Supply voltage 4.75
+0.5 –0.25
V
Vcc EVR voltage 3.15 ±0.15 V
CXA2002R
48 pin LQFP (Plastic)
E95201-ST
2-channel Recording/Playback Amplifier
Application
8 mm VCR
Structure
Bipolar silicon monolithic IC
Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.
CXA2002R
– 2 –
Block Diagram
HEAD
REC
V/I
RAMP
GEN
15dB
40dB
VPSW1
VPSW2
PCM
VIDEO
YGCA
1
1
1
1
1
1
2
CGCA
LOWGCA
LOWGCA
RF AGC
AGCDET
DOCDET
M · T –6dB
12dB
MUTE
2CH
1CH
MUTE
2CH
1CH
PCMSW
VIDEOSW
REC
HEAD
40dB
15dB
V/I
RAMP
GEN
RAMPCONT
RAMP
RFSWP
BOTH REC
RP PB
MTQ
MTF0
MTG
PCMOUT
MTOUT
40
39
38
37
41
42
43
44
45
46
47
48
2
3
4
5
6
7
8
9
10
11
12
1
13
1415
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
36
35
34
31
32
33
VPPCMIN
RECPCM
VPVTRIN
RECVIDEO
VREG
GND
IR1
IR
VG2
PCMIN
PCMREC
ATFIN
CCONT
AFMIN
AFREC
CIN
LOWLEVEL
YIN
YLEVEL
RFAGCOUT
RFAGCTC
RFAGCIN
DOCDET
DOP
V
CC2
REC2CONT
REC2OUT
PB2IN
PBDUMP2
PBDUMP1
GND1
PB1IN
REC1OUT
REC1CONT
V
CC1
GND2
V
CC
V
CC
EVR
PCM
VIDEO
CXA2002R
– 3 –
Pin Description
1 CCONT
EVR adjusting pin for the recording chroma level. Increasing the applied voltage reduces the gain.
2 AFMIN
Input pin for recording AFM. DC component is cut by built-in C. Input level: 125mVp-p (typ.)
3 AFREC
After-recording mode switchover pin (High: After­recording) H: 2.3V or above L: 0.6V or below
4 CIN 2.45
Recording chroma input pin. Input after cutting DC component with C. Input level: 300mVp-p (typ.)
1
14350k
10k25k
15k
7k
7k
2
143
20p
70µ
50k
143
35µ
3
35µ35µ
1.5V
143
2.45V
70µ
50k
4
Pin No.
Symbol
Pin
voltage
Equivalent circuit Description
CXA2002R
– 4 –
5 LOWLEVEL
EVR adjusting pin for recording RF. Increasing the applied voltage reduces the gain. Simultaneous adjustment of VIDEO and PCM paths. VIDEO path: C+AFM+ATF
adjustment
PCM path: ATF adjustment
6 YIN 2.45
Recording Y input pin. Input after cutting DC component with C. Input level: 500mVp-p (typ.)
7 YLEVEL
EVR adjusting pin for the recording Y signal level. Increasing the applied voltage reduces YLEV.
8 RFAGCOUT 2.8
Playback Y signal output pin. Output level: 410mVp-p (typ.)
14350k
10k25k
15k
7k7k
5
143
40µ
50k
2.45V
6
14350k
10k25k
15k
7k7k
7
8
40µ
600µ
410µ
Pin
No.
Symbol
Pin
voltage
Equivalent circuit Description
CXA2002R
– 5 –
9
RFAGCTC
Pin to apply time constant of RFAGC. EVR adjustment of RFAGC gain is possible.
Adjustment range:
(
2.5V to 4.75V
)
Gain: Small to Large
10 RFAGCIN
RFAGC input pin for the playback Y signal. Playback VIDEO signal output to Pin 14 (MTOUT) is input again to Pin 10 (RFAGCIN) via external ATF TRAP, AFM TRAP and C TRAP. DC component is cut by built-in C.
11 DOCDET 2.5
Pin to determine the dropout detection level.
12 DOP
H: 3.15 L: 0
Output pin for the dropout detection signal. High upon dropout.
143
50µ50µ25µ25µ
9
143
50µ
50k
3.25V
10
13p
143
50µ
79k
11
47k
4.15V
12
150
2.4k
1.3m
3.15V
9
Vcc
4700p
470k
Pin No.
Symbol
Pin
voltage
Equivalent circuit Description
CXA2002R
– 6 –
14 MTOUT 2.4
Output pin for playback VIDEO signal. Y + C + AMF + ATF is output.
13 VCC EVR 3.15
Power supply pin for EVR block.
15 MTG
EVR adjusting pin for the middle-tune boost. Increasing the applied voltage reduces the boost.
16 PCMOUT 2 Output pin for playback PCM
17 MTF0
EVR adjusting pin to determine middle-tune fo. Increasing the applied voltage increases fo.
40µ
400µ
14
330µ
14350k
10k25k
15k
7k7k
15
40µ
360µ
16
3.5k
310µ
14350k
10k25k
15k
7k7k
17
Pin
No.
Symbol
Pin
voltage
Equivalent circuit Description
CXA2002R
– 7 –
18
RP PB
REC/PB switchover pin High: PB 2.3V or above Low: REC 0.6V or below
19 VCC 4.75
Power supply pin for components other than REC amplifier, PB amplifier and EVR.
20 BOTH REC
EACH REC/BOTH REC switchover pin. High: BOTH REC 2.3V or
above
Low: EACH REC 0.6V or
below
21 RFSWP
RFSWP input pin. High: 2.3V or above Low: 0.6V or below
22 RAMP
Pin to turn ON/OFF the REC amplifier bias current during after-recording. The bias current turns ON when this pin goes high. High: 2.3V or above Low: 0.6V or below
18
50k
143
6.1k
35µ35µ35µ
1.5V
143
35µ
35µ
35µ
1.5V
20
143
35µ35µ35µ
1.5V
21
143
35µ35µ35µ
1.5V
22
Pin No.
Symbol
Pin
voltage
Equivalent circuit Description
CXA2002R
– 8 –
23 RAMPCONT
Ramp pulse rising slope switchover pin. Low: 32µA/µs 0.6V or below High: 17µA/µs 2.3V or above (The fall time is 32µA/µs in both cases.)
25 VCC1 4.75
Power supply pin for CH1 REC amplifier and PB amplifier.
24 MTQ
EVR adjusting pin to determine middle-tune Q. Increasing the applied voltage increases Q.
26 REC1CONT
EVR adjusting pin for the CH1 recording dumping level. Reducing the applied voltage strengthens dumping.
27 REC1OUT
CH1 recording output pin. Open collector.
143
35µ35µ35µ
1.5V
23
143
50k
10k25k
15k
7k7k
24
26
143
270
71k
40µ
40µ
34k
66k
27
30
1k
12k
5.7k
Pin
No.
Symbol
Pin
voltage
Equivalent circuit Description
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