Wydaje mi się, że do tej płyty nie ma schematu. Ale może ktoś znajdzie. Układ to zapewne BA7622F.
BA7622 / BA7622F
Multimedia ICs
75Ω driver IC with 3 internal circuits
BA7622 / BA7622F
The BA7622 and BA7622F are 75Ω driver-ICs developed for use in video equipment. The ICs include three 75Ω driver
circuits, two of which have sync-tip clamp inputs. The other driver has a biased input terminated with a 20kΩ resistor.
Each output can drive two loads (75Ω×2).
Applications
Video cassette recorders, televisions and camcorders
Features
1) Two built-in clamp circuits.
2) Simultaneous drive of Y, C and composite video signals possible.
3) Each output can drive two loads.
Absolute maximum ratings (Ta = 25°C)
Parameter
Symbol
Limits
Unit
VCC
8.0
V
Power supply voltage
BA7622
Power dissipation
800 ∗1
Pd
550 ∗2
BA7622F
mW
Operating temperature
Topr
−25 ~ +75
°C
Storage temperature
Tstg
−55 ~ +125
°C
∗1 Reduced by 8.0mW for each increase in Ta of 1°C over 25°C. (BA7622)
∗2 Reduced by 5.5mW for each increase in Ta of 1°C over 25°C. (BA7622F)
Block diagram
GND
IN1
75Ω
driver
Clamp
IN2
3
Clamp
OUT1
7
OUT2
75Ω
driver
6
OUT3
5
2
8
75Ω
driver
1
VCC
20k
IN3
4
NO Clamp
BA7622 / BA7622F
Multimedia ICs
Pin descriptions
Pin No.
Pin name
1
GND
2
IN1
Clamp input
Input composite video or the Y signal separated from Y / C.
3
IN2
Clamp input
Input composite video or the Y signal separated from Y / C.
4
IN3
Biased input
Input the chroma signal. Terminated with a 20kΩ resistor.
5
VCC
Power supply
6
OUT3
Biased output
Output for the signal input to IN3. When connected to earth a protection circuit operates,
and the IC enters power-save mode.
7
OUT2
Clamped output
Output for the signal input to IN2. When connected to earth a protection circuit operates,
and the IC enters power-save mode.
8
OUT1
Clamped output
Output for the signal input to IN1. When connected to earth a protection circuit operates,
and the IC enters power-save mode.
Function
Ground connection
Electrical characteristics (unless otherwise noted, Ta = 25°C and VCC = 5V, and load is two system drive)
Symbol
Min.
Operating voltage
VCC
4.5
5.0
5.5
V
Circuit current
ICC
−
23.6
35.4
mA
Maximum output level
Vom
2.8
3.3
−
VP-P
f=1kHz, THD=1.0%
Voltage gain
Gv
−1.2
−0.6
0
dB
f=1MHz, VIN=2.0VP-P
Frequency characteristics
Gf
−3
0
1.3
dB
10MHz / 1MHz, VIN=1.0VP-P
Differential gain 75Ω drive 1
DG1
−
0.4
1.0
%
VIN=2.0VP-P, standard staircase signal
Differential phase 75Ω drive 1
DP1
−
0.4
1.0
deg
VIN=2.0VP-P, standard staircase signal
Differential gain 75Ω drive 2
DG2
−
0.7
2.0
%
VIN=2.0VP-P, standard staircase signal
Differential phase 75Ω drive 2
DP2
−
0.7
2.0
deg
VIN=2.0VP-P, standard staircase signal
f=4.43MHz, VIN=2.0VP-P
Parameter
Typ.
Max.
Unit
Interchannel crosstalk
CT
−
−60
−
dB
Input impedance (VIN3)
ZIN3
17
20
23
kΩ
THD32
−
0.1
0.5
%
Total-harmonic distortion (VIN3)
Conditions
−
No signal
−
f=1kHz, VIN=1.0VP-P
BA7622 / BA7622F
Multimedia ICs
Input / output circuits
OUT1, 2, 3
VCC
IN1, 2
VCC
20k
2, 3
6, 7, 8
100µA
IN3
VCC
20k
4
10k
100µA
Measurement circuit
Vector
Scope
Analyzer
Audio
Vector
Scope
V
~
1
2
Analyzer
Audio
Vector
Scope
Analyzer
Audio
V
~
3
1
SWD
2
V
~
3
1
2
VCC=5V
3
SWF
SWE
+
0.022µF
47µF
75Ω
driver
1
2
470µ
75Ω
driver
Clamp
3
+ 75
470µ
7
75Ω
driver
Clamp
+
8
75
+
6
75
75
75
470µ
75
20k
4
1
2
+
3
VCC=5V
1
+ +
1µ 1µ 1µ
200µA +
600
~
OSC
VCC=5V
SWC
SWB
4
2
3
4
200µA
SG
V
~
OSC
3
4
1
+ +
1µ 1µ 1µ
2
+
+ +
1µ 1µ 1µ
600
~
75
75
75
VCC=5V
SWA
+
1000µ
75
5
NO Clamp
The circuit for driving one 75Ω output load.
The circuit for driving two 75Ω output loads is as.
50µA
600
~
SG
V
~
OSC
~
SG
Fig.1
V
BA7622 / BA7622F
Multimedia ICs
Measurement conditions
Parameter
Symbol
IN1
IN2
IN3
OUT1
OUT2
OUT3
SWA
SWB
SWC
SWD
SWE
SWF
3
3
3
×
×
×
1
3
3
3
×
×
Vom22
3
1
3
×
3
×
Vom32
Maximum output level
ICC
Vom12
Current dissipation
3
3
1
×
×
3
Gv12
3
3
3
×
1
3
×
3
×
3
3
1
×
×
3
3
3
×
×
f22
3
1
3
×
3
×
f32
3
1
×
×
3
3
×
3
1
3
3
×
×
3
3
1
3
3
×
×
CT213
3
1
3
×
×
3
CT311
3
3
1
3
×
×
CT312
3
3
1
×
3
×
ZIN3
3
3
4
×
×
×
THD12
1
3
3
3
×
3
1
3
×
3
×
3
3
1
×
×
−
∗3
×
THD22
THD32
Total-harmonic distortion
−
×
CT211
∗2
3
1
CT113
Input resistance
3
CT112
Interchannel crosstalk
∗1
3
1
−
×
3
f12
Frequency characteristic
1
Gv22
Gv32
Voltage gain
Conditions
3
∗4
× : Any of switches 1, 2, or 3 possible.
∗1: Connect a distortion meter to the output, and input a f=1kHz sine wave. Adjust the input level until the output distortion is 0.5%.
This output voltage at this time is the maximum output level Vom (VP-P).
∗2: Input a 2.0VP-P, 1MHz sine wave. The voltage gain is given by GV=20 log (VOUT / VIN).
∗3: Measure the input pin voltage VIN50 when a current of DC50µA is flowing into the input pin. Measure the input pin open-circuit voltage VIN0.
The input impedance is given by Z=(VIN50 − VIN0) / 50×10−6[Ω].
∗4: Input a 1.0VP-P, 1kHz sine wave. Connect a distortion meter to the output and measure the total-harmonic distortion.
BA7622 / BA7622F
Multimedia ICs
Application example
VCC=5V
+ 47µF
0.022µF
75
75Ω
driver
1
Composite
Video
Signal
+
2
1µF
+
Y Signal
3
75
1000µF
7
75Ω
driver
Clamp
1µF
8
75Ω
driver
Clamp
4
0.01µF
VIDEO
OUT2
6
75
+
Y
C
Y
C
1000µF
75
+
1µF
75
20k
C Signal
VIDEO
OUT1
+
5
NO Clamp
75
Fig.2
Electrical characteristic curves
0
GAIN: GV (dB)
GAIN: GV (dB)
20
0
– 20
– 40
– 20
– 40
– 60
– 80
100k
1M
10M
100k
100M
1M
10M
FREQUENCY: f (Hz)
FREQUENCY: f (Hz)
Fig. 3 Frequency characteristic
Fig. 4 Crosstalk
External dimensions (Units : mm)
BA7622F
BA7622
5.0 ± 0.2
9.3 ± 0.3
1
0.5 ± 0.1
DIP8
1.27
0.15 ± 0.1
6.2 ± 0.3
0.3 ± 0.1
2.54
4
1.5 ± 0.1
0.51Min.
3.2 ± 0.2 3.4 ± 0.3
7.62
5
4.4 ± 0.2
4
0.11
1
8
5
6.5 ± 0.3
8
0.4 ± 0.1
0.3Min.
0° ~ 15°
0.15
SOP8
100M
Appendix
Notes
No technical content pages of this document may be reproduced in any form or transmitted by any
means without prior permission of ROHM CO.,LTD.
The contents described herein are subject to change without notice. The specifications for the
product described in this document are for reference only. Upon actual use, therefore, please request
that specifications to be separately delivered.
Application circuit diagrams and circuit constants contained herein are shown as examples of standard
use and operation. Please pay careful attention to the peripheral conditions when designing circuits
and deciding upon circuit constants in the set.
Any data, including, but not limited to application circuit diagrams information, described herein
are intended only as illustrations of such devices and not as the specifications for such devices. ROHM
CO.,LTD. disclaims any warranty that any use of such devices shall be free from infringement of any
third party's intellectual property rights or other proprietary rights, and further, assumes no liability of
whatsoever nature in the event of any such infringement, or arising from or connected with or related
to the use of such devices.
Upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or
otherwise dispose of the same, no express or implied right or license to practice or commercially
exploit any intellectual property rights or other proprietary rights owned or controlled by
ROHM CO., LTD. is granted to any such buyer.
Products listed in this document use silicon as a basic material.
Products listed in this document are no antiradiation design.
The products listed in this document are designed to be used with ordinary electronic equipment or devices
(such as audio visual equipment, office-automation equipment, communications devices, electrical
appliances and electronic toys).
Should you intend to use these products with equipment or devices which require an extremely high level of
reliability and the malfunction of with would directly endanger human life (such as medical instruments,
transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers and other
safety devices), please be sure to consult with our sales representative in advance.
About Export Control Order in Japan
Products described herein are the objects of controlled goods in Annex 1 (Item 16) of Export Trade Control
Order in Japan.
In case of export from Japan, please confirm if it applies to " objective " criteria or an " informed " (by MITI clause)
on the basis of " catch all controls for Non-Proliferation of Weapons of Mass Destruction.
Appendix1-Rev1.0