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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 *Features amplifier has a total gain of 57dB (Typ.), 1) The playback
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. 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.
*Absolute maximum ratings (Ta = 25C)
Parameter Power supply voltage Power dissipation BA7180AS BA7180AFS Symbol VCC Pd Topr Tstg Limits 7.0 10001 937.52 - 20 ~ + 65 - 55 ~ + 150 Unit V mW C C
Operating temperature Storage temperature
1 Reduced by 10.0mW for each increase in Ta of 1C over 25C (free air). 2 When mounted on a 90mm x 90mm, t = 1.6mm glass epoxy board, reduced by 7.5mW for each
increase in Ta of 1C over 25C.
*Recommended operating conditions (Ta = 25C)
Parameter Playback / recording Symbol VCC Min. 4.5 Typ. 5.0 Max. 5.5 Unit V
1
Video ICs
BA7180AS / BA7180AFS
*Block diagram
BA7180AS
22
DFF IN DET FILTER REC DCFB N.C. PRE IN 1 (REC - OUT 1) GND 1 PRE IN 2 (REC - OUT 2) N.C. REC + OUT REC AGC FILTER PB / EE / REC CTRL
GND 2 REC LEVEL ADJ N.C. PB AGC OUT PB AGC FILTER H SYNC IN PB RF OUT AT ENVE OUT N.C. REC IN VCC
-
-
1 2 3
HPF
AGC
21 20 19
4
PRE
DET
18
5 6
7
17
RF
PRE
16
HPF
DET
15
8
+
14
9 DET
PRE / REC LOGIC
AGC MUTE REC
13
10 11
VCC
12
BA7180AFS
20
DFF IN
GND 2
1 2 3
-
19
DET FILTER
REC LEVEL ADJ
18
REC DCFB PRE IN 1 (REC - OUT 1) GND PRE IN 2 (REC - OUT 2) REC + OUT
N.C.
HPF
AGC
PRE
17
PB AGC OUT
4 5 6 7 8
DET
DET
16
PB AGC FILTER
PRE - +
15
H SYNC IN
RF
14
PB RF OUT
HPF
DET
13
N.C.
AT ENVE OUT
AGC
MUTE
REC
12
REC AGC FILTER
REC IN
9 10
PRE / REC
LOGIC
VCC
11
PB / EE / REC CTRL
VCC
2
Video ICs
BA7180AS / BA7180AFS
*Electrical characteristics (unless otherwise noted, Ta = 25C, VCC = 5.0V and f = 4.0MHz)
Parameter Symbol Min. Typ. Max. Unit Conditions (BA7180AS) Measurement circuit
Playback system (Pin 11 in Fig.1 measurement circuit "H" )
Quiescent current Voltage gain CH-1 Voltage gain CH-2 Voltage gain differential Frequency characteristic 2nd harmonic distortion 3rd harmonic distortion Maximum output level Crosstalk Output DC offset Input conversion noise AGC output level AGC control sensitivity AGC amp frequency characteristic PB switch ON resistance PRE CH 2 threshold voltage PRE CH 1 threshold voltage ENVE output level ENVE output level ENVE saturation voltage PB mode holding voltage EE mode holding voltage REC mode threshold voltage Iq (P) GVP1 GVP2 GVP GVf 2HDP 3HDP VOMP CTP -- 54 54 -1 -7 -- -- 1.0 -- 18 57 57 0 -3 - 45 - 45 1.5 - 38 0 0.25 300 0.3 0.5 4 -- -- 2.4 3.7 4.5 -- -- -- 45 60 60 +1 0 - 38 - 40 -- - 32 + 150 1.0 350 2.0 +3 10 VCC 1.2 2.9 3.95 -- VCC 2.8 1.2 mA dB dB dB dB dBc dBc VP-P dBc mVP-P Vrms mVP-P dB dB V V V V V V V V No signal Pin 5 input = 0.3mVP-P, pin 1: L, pin 16 output measurement Pin 7 input = 0.3mVP-P, pin 1: L, pin 16 output measurement GVP = GVP1 - GVP2 Difference in pin 16 output level for f = 8.0 / 1.0MHz, VIN = 0.3mVP-P VIN = 0.3mVP-P, 8.0MHz spurious VIN = 0.3mVP-P,12.0MHz spurious, guaranteed design value. When pin 16 output 2nd harmonic distortion is -30dBc Difference in pin 16 output level for pin 1: H / L. Pin 16 output DC offset for pin 1: H / L. RG = 10, input conversion of pin 14 output noise, guaranteed design value. VIN = 0.3mVP-P, Pin 19 output measurement Pin 19 output level difference for VIN = 0.15 ~ 0.6mVP-P
Difference in pin 19 output level for f = 8.0 / 1.0MHz VIN = 0.3mVP-P, guaranteed design value.
Fig.1 Fig.1 Fig.1 Fig.1 Fig.1 Fig.1 Fig.1 Fig.1 Fig.1 Fig.1 Fig.1 Fig.1 Fig.1 Fig.1 Fig.1 Fig.1 Fig.1 Fig.1 Fig.1 Fig.1 Fig.1 Fig.1 Fig.1
V ODC - 150 VNIN VAGC VAGC GVAF RON9 VTH1H VTH1L VENV2 VENV3 VENV4 VTH10H VTH10M VTH10L -- 250 -- -3 -- 3.5 0 1.9 3.45 4.0 3.8 2.2 0
Pin 9 impedance, guaranteed design value. Pin 1 DC voltage for CH 2 operation Pin 1 DC voltage for CH 1 operation Pin 15 output measurement when pin 16 output = 100mVP-P Pin 15 output measurement when pin 16 output = 400mVP-P Pin 15 output measurement for large signal Pin 11 DC voltage for PB mode Pin 11 DC voltage for REC MUTE mode Pin 11 DC voltage for REC mode
3
Video ICs
BA7180AS / BA7180AFS
Parameter
Symbol Min. Typ. Max. Unit
Conditions (BA7180AS)
Measurement circuit
Recording system (Pin 11 in Fig. 2 mesurement circuit "L")
Quiescent current Recording AGC level AGC control sensitivity REC amplifier frequency characteristic 2nd harmonic distortion 3rd harmonic distortion Cross modulation distortion Maximum output level Recording current load characteristic Mute attenuation ratio AGC mode holding voltage AGC mode holding voltage Iq
(R)
-- 27 -- -4
72 30 0.3 - 1.5
110
mA
No signal Pin 13 input = 125mVP-P, pin 9 output measurement Pin 9 output level difference for pin 13 input = 62.5mVP-P ~ 250mVP-P Pin 9 output level difference for f = 8.0 / 1.0MHz, pin 12 input = 125mVP-P, guaranteed design value. Pin 13 input = 125mVP-P 8MHz spurious Pin 13 input = 125mVP-P 12MHz spurious, guaranteed design value. 4.0MHz 630kHz spurious, guaranteed design value.
Fig.2 Fig.2 Fig.2 Fig.2 Fig.2 Fig.2 Fig.2 Fig.2 Fig.2 Fig.2 Fig.2 Fig.2
IOAR IOAR IOAF 2HDR 3HDR CMDR IOMR
33 mAP-P 1.5 -- dB dB dBc dBc dBc
-- - 45 - 38 -- - 50 - 40 -- - 50 - 40 40 50 -- --
mAP-P When pin 9 output 2nd harmonic distortion is -30dB dB dBc V V Pin 9 output level difference for load L: 8.2 ~ 12H, guaranteed design value. Pin 9 output level difference for pin 11: M / H.
Pin 17 DC voltage to maintain recording AGC operation Pin 17 DC voltage to maintain recording AGC stopped
I ORL - 1.5 - 0.35 MUR VTH15H VTH15L
-- - 45 - 38 2.7 0 -- -- VCC 1.2
Note: dBc: dB below carrier (used to express relative level from carrier reference for convenience sake)
*Reference values (unless otherwise noted, Ta = 25C, VCC = 4.8V and f = 4.0MHz)
Parameter ENVE output level ENVE output level Symbol VENV2' VENV3' Min. 1.8 3.35 Typ. 2.3 3.6 Max. 2.8 3.85 Unit V V Conditions (BA7180AS) Pin 15 output measurement when pin 16 output = 100mVP-P. Pin 15 output measurement when pin 16 output = 400mVP-P.
4
Video ICs
22
1
*Measurement circuits
DFF IN 0.1 43k 21 2 REC LEVEL ADJ
0.1 20 3 19 4 AGC HPF N.C. 1k - 0.1 18 PRE DET 5 10 17 6 0.1 H SYNC IN 390k 16 PB RF OUT 0.1 - 15 8 HPF DET AT ENVE HOLD OUT 0.1 N.C.
BA7180AS (playback system)
PRE IN 1
PB AGC OUT
Fig.1
RF 10 PRE 7 0.1 1k N.C. + 9 AGC 0.1 DET 10 MUTE REC 11 VCC LOGIC PRE / REC
PRE IN 2
14 13 12
N.C.
REC IN 0.1
BA7180AS / BA7180AFS
Units: R []
PB / EE / REC CTRL L: REC MUTE
C [F]
L [H]
+
L: REC START
VCC 5V
5
6
22 1 DFF IN 0.1 43k 21 2 REC LEVEL ADJ 0.1 20 3 19 4 - 0.1 18 DET AGC HPF N.C. 0.1 PRE 5 8.2 0.1 17 6 RF H SYNC IN 390k 16 PB RF OUT 0.1 - 8 15 HPF DET AT ENVE HOLD OUT N.C.
Video ICs
BA7180AS (recording system)
PB AGC OUT
Fig.2
8.2 PRE 7 0.1 10 N.C. + 9 AGC 0.1 DET 10 MUTE REC 11 VCC LOGIC PRE / REC
REC OUT
14 13 12
N.C.
REC IN 0.1
BA7180AS / BA7180AFS
Units: R []
PB / EE / REC CTRL L: REC MUTE
C [F]
L [H]
+
L: REC START
VCC 5V
Video ICs
1
20
DFF IN 0.1 43k REC LEVEL ADJ 19 2
0.1 18 3 N.C.
-
PRE IN 1 1k 0.1 17
AGC
BA7180AFS (playback system)
HPF
PRE
4
PB AGC OUT 0.1
10
16
DET
5
0.1 10
PRE
Fig.3
6
RF
15 390k
H SYNC IN
0.1
-
PRE IN 2 7
1k
14 0.1
+
PB RF OUT
8
AGC
13
HPF
DET
N.C. 0.1 DET 9
AT ENVE HOLD OUT
12
MUTE
REC
REC IN 0.1 11 VCC
PB / EE / REC CTRL LOGIC 10
C [F]
BA7180AS / BA7180AFS
Units: R []
PRE / REC
L [H]
L: REC MUTE
+
L: REC START
VCC 5V
7
8
1 20 0.1 43k REC LEVEL ADJ 19 2 0.1 18 3 N.C.
-
Video ICs
DFF IN
0.1 17
AGC
BA7180AFS (recording system)
HPF
PRE
4
PB AGC OUT 0.1
8.2
16
DET
5
0.1 8.2 6
PRE RF
Fig.4
0.1 10
-
15 390k
H SYNC IN
REC OUT 7
+
14 0.1
PB RF OUT
8
AGC
13
HPF
DET
N.C. 0.1 DET 9
AT ENVE HOLD OUT
12
MUTE
REC
REC IN 0.1 11 VCC
PB / EE / REC CTRL LOGIC 10
C [F]
BA7180AS / BA7180AFS
Units: R []
PRE / REC
L [H]
L: REC MUTE
+
L: REC START
VCC 5V
Video ICs
operation *Circuitsystem logic table Control (1) DFF IN (pin 1) * Playback input selection (head switching)
Control pin DFF IN H L Function Selected playback input Channel 2 (PRE IN2) Channel 1 (PRE IN1) Control voltage VCTRL1 [V] 3.5 ~ VCC 0.0 ~ 1.2
BA7180AS / BA7180AFS
(2) H SYNC IN (BA7180AS: pin 17, BA7180AFS: pin 15) * Controls recording AGC detector block operation.
Control pin H SYNC H L Function AGC detector ON OFF Control voltage VCTRL1 [V] 2.7 ~ VCC 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 H M L Mode PB REC MUTE REC Function PRE AMP ON OFF OFF AT ENVE ON OFF OFF REC MUTE OFF ON OFF REC AMP OFF ON ON Control voltage VCTRL1 [V] 3.8 ~ VCC 2.2 ~ 2.8 0.0 ~ 1.2
* The PB / EE / REC CTRL pin is pulled up to VCC via a 33k resistor.
*Operation notesconnected to GND. N.C. pins can be
9
*Application examples
10
22 1
Video ICs
BA7180AS
DFF IN 0.1 43k 21 2 REC LEVEL ADJ
0.1 20 3 19 4 - 0.1 18 DET AGC HPF N.C. 0.1 PRE 5 0.1 17 6 H SYNC IN 390k 16 PB RF OUT 0.1 - 15 8 HPF DET AT ENVE HOLD OUT N.C.
PB AGC OUT
HEAD A RF
Fig.5
PRE 7 0.1 N.C. + 9 AGC 0.1 DET 10 MUTE REC 11 VCC LOGIC PRE / REC
HEAD B
14 13 12
N.C.
REC IN 0.1
PB / EE / REC CTRL L: REC MUTE
C [F]
+
BA7180AS / BA7180AFS
Units: R []
L [H]
L: REC START
VCC 5V
Video ICs
20
1
BA7180AFS
DFF IN 0.1 43k 19 2 REC LEVEL ADJ
0.1 18 3 - N.C.
0.1 17 AGC HPF PRE 4 PB AGC OUT 0.1 16 DET 5
HEAD A
Fig.6
PRE 6 RF 0.1 - 7 + 8 HPF DET N.C. AGC 0.1 DET 9 MUTE REC 10 VCC LOGIC PRE / REC
HEAD B 15
0.1 H SYNC IN 390k 14 0.1 13 12 0.1 11 AT ENVE HOLD OUT PB RF OUT
REC IN
BA7180AS / BA7180AFS
Units: R []
PB / EE / REC CTRL L: REC MUTE
C [F]
L [H]
+
L: REC START
VCC 5V
11
Video ICs
BA7180AS / BA7180AFS
*External dimensions (Units: mm)
BA7180AS BA7180AFS
8.7 0.2 19.4 0.3 7.8 0.3 22 12 6.5 0.3 5.4 0.2 20 11
0.51Min.
3.4 0.2 3.95 0.3
1
11
7.62 1 1.8 0.1 10
0.11
0.3 0.1
0.8
0.36 0.1
0.3Min. 0.15
1.778
0.5 0.1
0 ~ 15
SDIP22
SSOP-A20
12
0.15 0.1

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