ROHM BA7180AS

Video ICs
2-channel PRE / REC amplifier with
auto-tracking interface
BA7180AS / BA7180AFS
The BA7180AS and BA7180AFS are PRE / REC amplifiers developed for use in video cassette recorders. They
have been designed for use in two-head decks and feature built-in FB damping, two preamplifiers, a chroma output
amplifier, an FM output amplifier (with AGC), an envelope detector, a constant-current BTL-drive REC amplifier (with
AGC) and built-in channel and REC / PB switches on a single monolithic IC.
Applications
•VCRs
•1)Features
The playback amplifier has a total gain of 57dB (Typ.),
4) The recording amplifier uses constant-current BLT
drive that handles load variations (i.e. head impedance) well, and gives stable recording characteristics. A single circuit is provided for 2-head VCR use.
5) Built-in recording level AGC means adjustment of
FM recording current is not necessary.
6) Head switches for 2-channel PRE / REC system
provided.
7) Operates off a sigle 5V power supply, with low
power dissipation.
and has a low-noise preamplifier. Designed for VHSband operation with low external parts count.The ICs
have 2 circuits for 2-head VCR applications.
2) Two playback output systems (through output and
AGC output). The AGC output level is 300mVP-P
(Typ.); suitable for FM brightness signal output.
3) Auto-tracking interface for automated tracking
adjustment. The detector characteristic is non-linear
to improve tracking accuracy during playback of low
signal levels.
•Absolute maximum ratings (Ta = 25°C)
Parameter
Symbol
Limits
Unit
VCC
7.0
V
Power supply voltage
Power dissipation
BA7180AS
BA7180AFS
1000∗1
Pd
mW
937.5∗2
Operating temperature
Topr
– 20 ~ + 65
°C
Storage temperature
Tstg
– 55 ~ + 150
°C
∗1 Reduced by 10.0mW for each increase in Ta of 1°C over 25°C (free air).
∗2 When mounted on a 90mm × 90mm, t = 1.6mm glass epoxy board, reduced by 7.5mW for each
increase in Ta of 1°C over 25°C.
•Recommended operating conditions (Ta = 25°C)
Parameter
Playback / recording
Symbol
Min.
Typ.
Max.
Unit
VCC
4.5
5.0
5.5
V
1
Video ICs
BA7180AS / BA7180AFS
•Block diagram
BA7180AS
22
21
20
19
PB AGC OUT
18
PB AGC FILTER
17
H SYNC IN
16
PB RF OUT
15
AT ENVE OUT
14
N.C.
13
REC IN
12
VCC
–
AGC
HPF
N.C.
4
N.C.
REC LEVEL ADJ
3
REC DCFB
GND 2
2
DET FILTER
1
DFF IN
DET
PRE
RF
PRE
–
7
PRE IN 2
(REC – OUT 2)
6
GND 1
5
PRE IN 1
(REC – OUT 1)
DET
HPF
8
N.C.
+
AGC
MUTE
REC
VCC
11
PRE / REC
10
PB / EE / REC CTRL
LOGIC
9
REC AGC FILTER
DET
REC + OUT
BA7180AFS
20
19
18
N.C.
17
PB AGC OUT
16
PB AGC FILTER
15
H SYNC IN
14
PB RF OUT
13
AT ENVE OUT
12
REC IN
11
VCC
–
REC LEVEL ADJ
3
REC DCFB
GND 2
2
DET FILTER
1
DFF IN
AGC
HPF
PRE
DET
RF
PRE
6
PRE IN 2
(REC – OUT 2)
5
GND
4
PRE IN 1
(REC – OUT 1)
–
7
REC + OUT
+
DET
AGC
MUTE
REC
VCC
PRE / REC
10
LOGIC
PB / EE / REC CTRL
DET
9
2
REC AGC FILTER
HPF
8
N.C.
Video ICs
BA7180AS / BA7180AFS
•Electrical characteristics (unless otherwise noted, Ta = 25°C, V
CC =
Parameter
Symbol
Min.
Typ.
Max.
Unit
5.0V and f = 4.0MHz)
Conditions (BA7180AS)
Measurement
circuit
〈Playback system〉 (Pin 11 in Fig.1 measurement circuit "H" )
Quiescent current
Iq (P)
—
18
45
mA
No signal
Fig.1
Voltage gain CH-1
GVP1
54
57
60
dB
Pin 5 input = 0.3mVP-P, pin 1: L,
pin 16 output measurement
Fig.1
Voltage gain CH-2
GVP2
54
57
60
dB
Pin 7 input = 0.3mVP-P, pin 1: L,
pin 16 output measurement
Fig.1
Voltage gain differential
∆G VP
0
+1
dB
∆G VP = GVP1 – GVP2
Fig.1
Fig.1
–1
Frequency characteristic
∆GVf
–7
–3
0
dB
Difference in pin 16 output level for
f = 8.0 / 1.0MHz, VIN = 0.3mVP-P
2nd harmonic distortion
2HDP
—
– 45
– 38
dBc
VIN = 0.3mVP-P, 8.0MHz spurious
Fig.1
3rd harmonic distortion
3HDP
—
– 45
– 40
dBc
VIN = 0.3mVP-P,12.0MHz spurious,
guaranteed design value.
Fig.1
Maximum output level
VOMP
1.0
1.5
—
VP-P
When pin 16 output 2nd harmonic distortion is -30dBc
Fig.1
Crosstalk
CTP
—
– 38
– 32
dBc
Difference in pin 16 output level for pin 1: H / L.
Fig.1
∆V ODC – 150
0
+ 150
mVP-P
Pin 16 output DC offset for pin 1: H / L.
Fig.1
Output DC offset
Input conversion noise
VNIN
—
0.25
1.0
µVrms
RG = 10Ω, input conversion of pin 14
output noise, guaranteed design value.
Fig.1
AGC output level
VAGC
250
300
350
mVP-P
VIN = 0.3mVP-P,
Pin 19 output measurement
Fig.1
AGC control sensitivity
∆VAGC
—
0.3
2.0
dB
Pin 19 output level difference for
VIN = 0.15 ~ 0.6mVP-P
Fig.1
AGC amp frequency
characteristic
∆GVAF
–3
0.5
+3
dB
Difference in pin 19 output level for f = 8.0 / 1.0MHz
VIN = 0.3mVP-P, guaranteed design value.
Fig.1
PB switch ON resistance
RON9
—
4
10
Ω
Pin 9 impedance, guaranteed design value.
Fig.1
PRE CH 2 threshold voltage
VTH1H
3.5
—
VCC
V
Pin 1 DC voltage for CH 2 operation
Fig.1
PRE CH 1 threshold voltage
VTH1L
0
—
1.2
V
Pin 1 DC voltage for CH 1 operation
Fig.1
ENVE output level
VENV2
1.9
2.4
2.9
V
Pin 15 output measurement when
pin 16 output = 100mVP-P
Fig.1
ENVE output level
VENV3
3.45
3.7
3.95
V
Pin 15 output measurement when
pin 16 output = 400mVP-P
Fig.1
ENVE saturation voltage
VENV4
4.0
4.5
—
V
Pin 15 output measurement for large signal
Fig.1
PB mode holding voltage
VTH10H
3.8
—
VCC
V
Pin 11 DC voltage for PB mode
Fig.1
EE mode holding voltage
VTH10M
2.2
—
2.8
V
Pin 11 DC voltage for REC MUTE mode
Fig.1
REC mode threshold voltage
VTH10L
0
—
1.2
V
Pin 11 DC voltage for REC mode
Fig.1
3
Video ICs
BA7180AS / BA7180AFS
Parameter
Conditions (BA7180AS)
Symbol Min. Typ. Max. Unit
Measurement
circuit
〈Recording system〉 (Pin 11 in Fig. 2 mesurement circuit "L")
Quiescent current
Iq
(R)
—
72
110
Recording AGC level
IOAR
27
30
AGC control sensitivity
∆IOAR
—
REC amplifier frequency characteristic
∆IOAF
–4
2nd harmonic distortion
mA
No signal
Fig.2
33 mAP-P
Pin 13 input = 125mVP-P, pin 9
output measurement
Fig.2
0.3
1.5
dB
Pin 9 output level difference for pin 13
input = 62.5mVP-P ~ 250mVP-P
Fig.2
– 1.5
—
dB
Pin 9 output level difference for f = 8.0 / 1.0MHz,
pin 12 input = 125mVP-P, guaranteed design value.
Fig.2
2HDR
— – 45 – 38
dBc
Pin 13 input = 125mVP-P 8MHz spurious
Fig.2
3rd harmonic distortion
3HDR
— – 50 – 40
dBc
Pin 13 input = 125mVP-P 12MHz spurious,
guaranteed design value.
Fig.2
Cross modulation distortion
CMDR
— – 50 – 40
dBc
4.0MHz ± 630kHz spurious, guaranteed design value.
Fig.2
Maximum output level
IOMR
40
50
Recording current load
characteristic
∆I ORL – 1.5 – 0.35
Mute attenuation ratio
—
mAP-P When pin 9 output 2nd harmonic distortion is -30dB
Fig.2
—
dB
Pin 9 output level difference for load L: 8.2
~ 12µH, guaranteed design value.
Fig.2
MUR
— – 45 – 38
dBc
Pin 9 output level difference for pin 11: M / H.
Fig.2
AGC mode holding voltage
VTH15H
2.7
—
VCC
V
Pin 17 DC voltage to maintain recording AGC operation
Fig.2
AGC mode holding voltage
VTH15L
0
—
1.2
V
Pin 17 DC voltage to maintain recording AGC stopped
Fig.2
Note:
dBc: dB below carrier (used to express relative level from carrier reference for convenience sake)
•Reference values (unless otherwise noted, Ta = 25°C, V
CC
Parameter
4
Symbol
Min.
Typ.
= 4.8V and f = 4.0MHz)
Max.
Unit
Conditions (BA7180AS)
ENVE output level
VENV2'
1.8
2.3
2.8
V
Pin 15 output measurement when
pin 16 output = 100mVP-P.
ENVE output level
VENV3'
3.35
3.6
3.85
V
Pin 15 output measurement when
pin 16 output = 400mVP-P.
DET
HPF
HPF
–
–
6
7
8
13
DET
+
9
10
L: REC START
REC
AGC
14
PB / EE / REC CTRL
L: REC MUTE
5
15
0.1µ
PRE
16
N.C.
17
1k
18
PRE IN 2
4
0.1µ
3
19
10
2
0.1µ
20
N.C.
21
10
1k
1
0.1µ
0.1µ
22
PRE IN 1
DFF IN
0.1µ
N.C.
0.1µ
390k
0.1µ
0.1µ
N.C.
43k
VCC 5V
REC IN
AT ENVE HOLD OUT
PB RF OUT
H SYNC IN
PB AGC OUT
REC LEVEL ADJ
Video ICs
BA7180AS / BA7180AFS
•Measurement circuits
BA7180AS (playback system)
+
12
MUTE
VCC
RF
AGC
PRE / REC
PRE
LOGIC
DET
11
Units: R [Ω]
C [F]
L [H]
Fig.1
5
6
REC
AGC
DET
HPF
HPF
–
–
6
Fig.2
7
8
14
13
DET
+
9
10
Units: R [Ω]
C [F]
L [H]
L: REC START
5
15
PB / EE / REC CTRL
L: REC MUTE
PRE
16
0.1µ
4
17
N.C.
18
10
3
0.1µ
2
19
8.2µ
8.2µ
20
0.1µ
21
N.C.
1
0.1µ
0.1µ
22
REC OUT
DFF IN
0.1µ
N.C.
0.1µ
390k
0.1µ
0.1µ
N.C.
43k
VCC 5V
REC IN
AT ENVE HOLD OUT
PB RF OUT
H SYNC IN
PB AGC OUT
REC LEVEL ADJ
Video ICs
BA7180AS / BA7180AFS
BA7180AS (recording system)
+
12
MUTE
VCC
RF
AGC
PRE / REC
PRE
LOGIC
DET
11
–
5
6
7
13
12
DET
REC
AGC
DET
HPF
HPF
PRE
8
9
L: REC START
4
14
PB / EE / REC CTRL
PRE
15
L: REC MUTE
–
0.1µ
N.C.
16
1k
17
PRE IN 2
3
0.1µ
18
10
2
0.1µ
19
10
1k
1
0.1µ
0.1µ
20
PRE IN 1
DFF IN
N.C.
0.1µ
0.1µ
390k
0.1µ
0.1µ
43k
VCC 5V
REC IN
AT ENVE HOLD OUT
PB RF OUT
H SYNC IN
PB AGC OUT
REC LEVEL ADJ
Video ICs
BA7180AS / BA7180AFS
BA7180AFS (playback system)
+
11
MUTE
VCC
RF
AGC
+
PRE / REC
LOGIC
DET
10
Units: R [Ω]
C [F]
L [H]
Fig.3
7
8
–
–
5
6
Fig.4
7
13
12
DET
REC
AGC
DET
HPF
HPF
PRE
8
9
Units: R [Ω]
C [F]
L [H]
L: REC START
4
14
PB / EE / REC CTRL
PRE
15
L: REC MUTE
3
16
0.1µ
N.C.
17
10
2
0.1µ
18
8.2µ
8.2µ
19
0.1µ
1
0.1µ
0.1µ
20
REC OUT
DFF IN
N.C.
0.1µ
0.1µ
390k
0.1µ
0.1µ
43k
VCC 5V
REC IN
AT ENVE HOLD OUT
PB RF OUT
H SYNC IN
PB AGC OUT
REC LEVEL ADJ
Video ICs
BA7180AS / BA7180AFS
BA7180AFS (recording system)
+
11
MUTE
VCC
RF
AGC
+
PRE / REC
LOGIC
DET
10
Video ICs
BA7180AS / BA7180AFS
Circuit operation
•Control
system logic table
(1) DFF IN (pin 1)
• Playback input selection (head switching)
Control pin
Function
DFF IN
Selected playback input
Control voltage
VCTRL1 [V]
H
Channel 2 (PRE IN2)
3.5 ~ VCC
L
Channel 1 (PRE IN1)
0.0 ~ 1.2
(2) H SYNC IN (BA7180AS: pin 17, BA7180AFS: pin 15)
• Controls recording AGC detector block operation.
Control pin
Function
H SYNC
AGC detector
Control voltage
VCTRL1 [V]
H
ON
2.7 ~ VCC
L
OFF
0.0 ~ 1.2
(3) PB / EE / REC CTRL (BA7180AS: pin 11, BA7180AFS: pin 10)
• Playback / recording mute / recording mode switching
Control pin
PB / EE / REC
Mode
Function
PRE AMP
AT ENVE
REC MUTE
REC AMP
Control voltage
VCTRL1 [V]
H
PB
ON
ON
OFF
OFF
3.8 ~ VCC
M
REC MUTE
OFF
OFF
ON
ON
2.2 ~ 2.8
L
REC
OFF
OFF
OFF
ON
0.0 ~ 1.2
· The PB / EE / REC CTRL pin is pulled up to VCC via a 33kΩ resistor.
notes
•N.C.Operation
pins can be connected to GND.
9
10
–
PRE
6
Fig.5
15
REC
AGC
DET
HPF
HPF
–
7
8
14
13
DET
+
9
10
Units: R [Ω]
C [F]
L [H]
L: REC START
5
16
PB / EE / REC CTRL
L: REC MUTE
4
17
0.1µ
3
18
N.C.
2
19
0.1µ
20
0.1µ
21
N.C.
1
0.1µ
0.1µ
22
HEAD B
HEAD A
DFF IN
0.1µ
N.C.
0.1µ
390k
0.1µ
0.1µ
N.C.
43k
VCC 5V
REC IN
AT ENVE HOLD OUT
PB RF OUT
H SYNC IN
PB AGC OUT
REC LEVEL ADJ
Video ICs
BA7180AS / BA7180AFS
•Application examples
BA7180AS
+
12
MUTE
VCC
RF
AGC
PRE / REC
PRE
LOGIC
DET
11
PRE
5
14
–
–
6
7
13
REC
AGC
DET
HPF
HPF
12
DET
+
8
9
L: REC START
4
15
PB / EE / REC CTRL
L: REC MUTE
3
16
0.1µ
17
N.C.
2
0.1µ
18
HEAD B
19
0.1µ
1
0.1µ
0.1µ
20
HEAD A
DFF IN
0.1µ
0.1µ
390k
0.1µ
0.1µ
N.C.
43k
VCC 5V
REC IN
AT ENVE HOLD OUT
PB RF OUT
H SYNC IN
PB AGC OUT
REC LEVEL ADJ
Video ICs
BA7180AS / BA7180AFS
BA7180AFS
+
11
MUTE
VCC
RF
AGC
PRE / REC
PRE
LOGIC
DET
10
Units: R [Ω]
C [F]
L [H]
Fig.6
11
Video ICs
BA7180AS / BA7180AFS
•External dimensions (Units: mm)
BA7180AS
BA7180AFS
8.7 ± 0.2
0.5 ± 0.1
SDIP22
12
1
10
0.15 ± 0.1
1.8 ± 0.1
0.3 ± 0.1
1.778
11
7.62
0.11
11
1
7.8 ± 0.3
12
6.5 ± 0.3
0.51Min.
3.4 ± 0.2 3.95 ± 0.3
22
20
5.4 ± 0.2
19.4 ± 0.3
0.8
0.36 ± 0.1
0.3Min.
0° ~ 15°
0.15
SSOP-A20