1
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.
1) The playback amplifier has a total gain of 57dB (Typ.),
and has a low-noise preamplifier. Designed for VHS-
band 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 300mV
P-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.
4) The recording amplifier uses constant-current BLT
drive that handles load variations (i.e. head imped-
ance) well, and gives stable recording characteris-
tics. 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.
Absolute maximum ratings (Ta = 25C)
Parameter
Symbol
Limits
Unit
Power supply voltage
Power dissipation
Operating temperature
Storage temperature
V
CC
7.0
V
Pd
BA7180AS
1000
1
mW
BA7180AFS
937.5
2
Topr
20 ~ + 65
C
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.
Features
Applications
VCRs
Recommended operating conditions (Ta = 25C)
Parameter
Symbol
Min.
Typ.
Max.
Unit
Playback / recording
V
CC
4.5
5.0
5.5
V
2
Video ICs
BA7180AS / BA7180AFS
Block diagram
BA7180AS
BA7180AFS
AGC
23456
7
89
1
0
20
19
18
17
16
15
14
13
12
PRE
PRE
AGC
DET
MUTE
REC
DET
HPF
LOGIC
DET
HPF
RF
GND 2
REC DCFB
GND 1
N.C.
N.C.
1
22
11
21
N.C.
N.C.
+
PRE / REC
(REC
OUT
REC
V
CC
V
CC
(REC
123456789
1
0
20
19
18
17
16
15
14
13
12
11
DET
AGC
PRE
PRE
+
REC
MUTE
DET
HPF
RF
HPF
AGC
LOGIC
GND 2
N.C.
GND
N.C.
PRE / REC
DET
(REC
OUT
REC
(REC
V
CC
V
CC
OUT 1)
OUT 2)
OUT 1)
OUT 2)
DFF IN
DET FILTER
PRE IN 1
PRE IN 2
REC AGC FILTER
PB / EE / REC CTRL
DFF IN
DET FILTER
REC DCFB
PRE IN 1
PRE IN 2
+
REC AGC FILTER
PB / EE / REC CTRL
REC IN
AT ENVE OUT
PB RF OUT
H SYNC IN
PB AGC FILTER
PB AGC OUT
REC LEVEL ADJ
REC IN
AT ENVE OUT
PB RF OUT
H SYNC IN
PB AGC FILTER
PB AGC OUT
REC LEVEL ADJ
+
3
Video ICs
BA7180AS / BA7180AFS
Electrical characteristics (unless otherwise noted, Ta = 25C, V
CC
= 5.0V and f = 4.0MHz)
Difference in pin
16 output level for
f = 8.0 / 1.0MHz, V
IN
= 0.3mV
P-P
Parameter
Symbol
Min.
Typ.
Max.
Unit
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
G
VP1
54
57
60
dB
Pin 5 input = 0.3mV
P-P
, pin 1: L,
pin 16 output measurement
Fig.1
Voltage gain CH-2
G
VP2
54
57
60
dB
Pin 7 input = 0.3mV
P-P
, pin 1: L,
pin 16 output measurement
Fig.1
Voltage gain differential
G
VP
1
0
+ 1
dB
G
VP
= G
VP1
G
VP2
Fig.1
Frequency characteristic
2nd harmonic distortion
G
Vf
7
3
0
dB
Fig.1
2HD
P
--
45
38
dBc
V
IN
= 0.3mV
P-P
, 8.0MHz spurious
Fig.1
3rd harmonic distortion
3HD
P
--
45
40
dBc
V
IN
= 0.3mV
P-P
,
12.0MHz spurious,
guaranteed design value.
Fig.1
Maximum output level
V
OMP
1.0
1.5
--
V
P-P
When pin 16 output 2nd harmonic distortion is -30dBc
Fig.1
Crosstalk
Output DC offset
Input conversion noise
AGC output level
AGC control sensitivity
CT
P
--
38
32
dBc
Difference in pin 16 output level for pin 1: H / L.
Fig.1
V
ODC
150
0
+ 150
mV
P-P
Pin 16 output DC offset for pin 1: H / L.
Fig.1
V
NIN
--
0.25
1.0
Vrms
RG = 10
, input conversion of pin 14
output noise, guaranteed design value.
Fig.1
V
AGC
250
300
350
mV
P-P
V
IN
= 0.3mV
P-P
,
Pin 19 output measurement
Fig.1
V
AGC
--
0.3
2.0
dB
Pin 19 output level difference for
V
IN
= 0.15 ~ 0.6mV
P-P
Fig.1
AGC amp frequency
characteristic
G
VAF
3
0.5
+ 3
dB
Difference in pin 19 output level for f = 8.0 / 1.0MHz
V
IN
= 0.3mV
P-P
, guaranteed design value.
Fig.1
PB switch ON resistance
R
ON9
--
4
10
Pin 9 impedance, guaranteed design value.
Fig.1
PRE CH 2 threshold voltage
PRE CH 1 threshold voltage
V
TH1H
3.5
--
V
CC
V
Pin 1 DC voltage for CH 2 operation
Pin 1 DC voltage for CH 1 operation
Fig.1
V
TH1L
0
--
1.2
V
Fig.1
ENVE output level
ENVE output level
ENVE saturation voltage
V
ENV2
1.9
2.4
2.9
V
Pin 15 output measurement when
pin 16 output = 100mV
P-P
Fig.1
V
ENV3
3.45
3.7
3.95
V
Pin 15 output measurement when
pin 16 output = 400mV
P-P
Fig.1
V
ENV4
4.0
4.5
--
V
Pin 15 output measurement for large signal
Fig.1
PB mode holding voltage
EE mode holding voltage
REC mode threshold voltage
V
TH10H
3.8
--
V
CC
V
Pin 11 DC voltage for PB mode
Pin 11 DC voltage for REC MUTE mode
Pin 11 DC voltage for REC mode
Fig.1
V
TH10M
2.2
--
2.8
V
Fig.1
V
TH10L
0
--
1.2
V
Fig.1
4
Video ICs
BA7180AS / BA7180AFS
Parameter
Symbol
Unit
Min.
Typ. Max.
Recording system
Quiescent current
Recording AGC level
AGC control sensitivity
REC amplifier frequency characteristic
2nd harmonic distortion
--
72
110
mA
I
OAR
27
30
33
I
OAR
--
0.3
1.5
dB
Pin 9 output level difference for pin 13
input = 62.5mV
P-P
~ 250mV
P-P
I
OAF
4
1.5
--
dB
2HD
R
--
45
38
dBc
3HD
R
--
50
40
dBc
CMD
R
--
50
40
dBc
4.0MHz
630kHz spurious, guaranteed design value.
Maximum output level
40
50
--
mA
P-P
When pin 9 output 2nd harmonic distortion is -30dB
I
ORL
1.5 0.35
--
dB
Pin 9 output level difference for load L: 8.2
~ 12
H, guaranteed design value.
MU
R
--
45
38
dBc
Pin 9 output level difference for pin 11: M / H.
AGC mode holding voltage
AGC mode holding voltage
V
TH15H
2.7
--
V
CC
V
Pin 17 DC voltage to maintain recording AGC operation
Pin 17 DC voltage to maintain recording AGC stopped
V
TH15L
0
--
1.2
V
mA
P-P
I
OMR
No signal
Pin 13 input = 125mV
P-P
, pin 9
output measurement
Iq
(R)
3rd harmonic distortion
Cross modulation distortion
Recording current load
characteristic
Mute attenuation ratio
Conditions (BA7180AS)
Fig.2
Fig.2
Fig.2
Fig.2
Fig.2
Fig.2
Fig.2
Fig.2
Fig.2
Fig.2
Fig.2
Fig.2
Pin 13 input = 125mV
P-P
12MHz spurious,
guaranteed design value.
Pin 9 output level difference for f = 8.0 / 1.0MHz,
pin 12 input = 125mV
P-P,
guaranteed design value.
Pin 13 input = 125mV
P-P
8MHz spurious
Note:
dBc: dB below carrier (used to express relative level from carrier reference for convenience sake)
Measurement
circuit
(Pin 11 in Fig. 2 mesurement circuit "L")
Reference values (unless otherwise noted, Ta = 25C, V
CC
= 4.8V and f = 4.0MHz)
Parameter
Symbol
Unit
Typ.
Max.
ENVE output level
ENVE output level
V
ENV2'
1.8
2.3
2.8
V
Pin 15 output measurement when
pin 16 output = 100mV
P-P
.
Pin 15 output measurement when
pin 16 output = 400mV
P-P.
V
ENV3'
3.35
3.6
3.85
V
Min.
Conditions (BA7180AS)
5
Video ICs
BA7180AS / BA7180AFS
Measurement circuits
BA7180AS (playback system)
43k
390k
N.C.
N.C.
10
10
1k
1k
AGC
PRE
PRE
+
AGC
DET
MUTE
REC
DET
HPF
LOGIC
DET
HPF
RF
22
N.C.
N.C.
PRE / REC
21
20
19
18
17
16
15
14
13
12
0.1
0.1
0.1
0.1
V
CC
0.1
0.1
0.1
0.1
0.1
1
2
3
4
5
6
7
8
9
10
11
R
C
L
REC LEVEL ADJ
PB AGC OUT
H SYNC IN
PB RF OUT
AT ENVE HOLD OUT
REC IN
V
CC
5V
DFF IN
PRE IN 1
PRE IN 2
PB / EE / REC CTRL
L: REC MUTE
L: REC START
Units:
[
]
[F]
[H]
Fig.1
+
6
Video ICs
BA7180AS / BA7180AFS
Fig.2
BA7180AS (recording system)
43k
390k
N.C.
AGC
PRE
PRE
+
AGC
DET
MUTE
REC
DET
HPF
LOGIC
DET
HPF
RF
22
N.C.
N.C.
PRE / REC
21
20
19
18
17
16
15
14
13
12
0.1
0.1
0.1
0.1
V
CC
0.1
0.1
0.1
1
2
3
4
5
6
7
8
9
10
11
REC
OUT
0.1
0.1
10
N.C.
8.2
8.2
DFF IN
L: REC START
L: REC MUTE
PB / EE / REC CTRL
REC LEVEL ADJ
PB AGC OUT
H SYNC IN
PB RF OUT
AT ENVE HOLD OUT
REC IN
V
CC
5V
R
C
L
Units:
[
]
[F]
[H]
+
7
Video ICs
BA7180AS / BA7180AFS
BA7180AFS (playback system)
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
DET
AGC
PRE
PRE
+
REC
MUTE
DET
HPF
RF
HPF
AGC
LOGIC
0.1
0.1
0.1
1k
0.1
1k
0.1
N.C.
N.C.
0.1
0.1
0.1
0.1
10
10
PRE / REC
43k
390k
DET
V
CC
AT ENVE HOLD OUT
REC IN
V
CC
5V
PB RF OUT
H SYNC IN
PB AGC OUT
REC LEVEL ADJ
DFF IN
PRE IN 1
PRE IN 2
PB / EE / REC CTRL
L: REC MUTE
L: REC START
R
C
L
Units:
[
]
[F]
[H]
Fig.3
+
8
Video ICs
BA7180AS / BA7180AFS
BA7180AFS (recording system)
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
DET
AGC
PRE
PRE
+
REC
MUTE
DET
HPF
RF
HPF
AGC
LOGIC
0.1
0.1
0.1
N.C.
N.C.
0.1
0.1
0.1
0.1
PRE / REC
43k
390k
DET
V
CC
10
0.1
REC OUT
DFF IN
REC IN
V
CC
5V
AT ENVE HOLD OUT
PB RF OUT
H SYNC IN
PB AGC OUT
REC LEVEL ADJ
0.1
8.2
8.2
L: REC START
L: REC MUTE
PB / EE / REC CTRL
R
C
L
Units:
[
]
[F]
[H]
Fig.4
+
9
Video ICs
BA7180AS / BA7180AFS
Circuit operation
Control system logic table
(1) DFF IN (pin 1)
Playback input selection (head switching)
Control pin
Control voltage
V
CTRL1
[V]
H
3.5 ~ V
CC
L
0.0 ~ 1.2
DFF IN
Function
Selected playback input
Channel 1 (PRE IN1)
Channel 2 (PRE IN2)
(2) H SYNC IN (BA7180AS: pin 17, BA7180AFS: pin 15)
Controls recording AGC detector block operation.
Control pin
H
ON
L
OFF
2.7 ~ V
CC
0.0 ~ 1.2
Function
AGC detector
H SYNC
Control voltage
V
CTRL1
[V]
(3) PB / EE / REC CTRL (BA7180AS: pin 11, BA7180AFS: pin 10)
Playback / recording mute / recording mode switching
Control pin
Mode
H
PB
ON
ON
OFF
OFF
M
OFF
OFF
ON
ON
L
REC
OFF
OFF
OFF
ON
PB / EE / REC
3.8 ~ V
CC
2.2 ~ 2.8
0.0 ~ 1.2
Function
PRE AMP
AT ENVE
REC MUTE
REC AMP
REC MUTE
The PB / EE / REC CTRL pin is pulled up to V
CC
via a 33k
resistor.
Control voltage
V
CTRL1
[V]
Operation notes
N.C. pins can be connected to GND.
10
Video ICs
BA7180AS / BA7180AFS
Application examples
BA7180AS
43k
390k
N.C.
N.C.
AGC
PRE
PRE
+
AGC
DET
MUTE
REC
DET
HPF
LOGIC
DET
HPF
RF
22
N.C.
N.C.
PRE / REC
21
20
19
18
17
16
15
14
13
12
0.1
0.1
0.1
V
CC
5V
0.1
V
CC
0.1
0.1
0.1
1
2
3
4
5
6
7
8
9
10
11
0.1
0.1
HEAD A
HEAD B
DFF IN
REC LEVEL ADJ
PB AGC OUT
H SYNC IN
REC IN
AT ENVE HOLD OUT
PB RF OUT
L: REC START
L: REC MUTE
PB / EE / REC CTRL
R
C
L
Units:
[
]
[F]
[H]
Fig.5
+
11
Video ICs
BA7180AS / BA7180AFS
BA7180AFS
43k
390k
N.C.
N.C.
AGC
PRE
PRE
+
AGC
DET
MUTE
REC
DET
HPF
LOGIC
DET
HPF
RF
PRE / REC
0.1
0.1
0.1
0.1
V
CC
0.1
0.1
0.1
1
2
3
4
5
6
7
8
9
10
0.1
0.1
20
19
18
17
16
15
14
13
12
11
DFF IN
HEAD A
HEAD B
REC LEVEL ADJ
PB AGC OUT
H SYNC IN
PB RF OUT
AT ENVE HOLD OUT
REC IN
V
CC
5V
L: REC START
L: REC MUTE
PB / EE / REC CTRL
R
C
L
Units:
[
]
[F]
[H]
Fig.6
+
12
Video ICs
BA7180AS / BA7180AFS
External dimensions (Units: mm)
3.95
0.3
0.51Min.
19.4
0.3
3.4
0.2
0.5
0.1
6.5
0.3
1
11
12
22
0.3
0.1
0
~ 15
1.778
7.62
SDIP22
BA7180AS BA7180AFS
SSOP-A20
11
10
20
1
0.11
7.8
0.3
5.4
0.2
8.7
0.2
0.15
0.1
0.36
0.1
0.8
1.8
0.1
0.3Min.
0.15
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