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Video ICs
4-channel PRE / REC amplifier with auto-tracking interface
BA7184S
The BA7184S is a PRE / REC amplifier developed for use in video cassette recorders. It is compatible with four-head decks and features built-in FB damping, four preamplifiers, a chroma output amplifier, an FM output amplifier (with AGC), an envelope detector and envelope comparator, a constant-current BTL-drive REC amplifier (with AGC) and channel switching, EP / SP switching, and mode switching integrated onto a single monolithic IC.
*Applications VCRs *Features amplifier has a total gain of 56dB 1) The playback
(Typ.), and has a low-noise preamplifier. Designed for VHS band operation with low external parts count. The IC has 4 circuits for 4-head VCR applications. 2) Two playback output systems (through output and AGC output). The AGC output level is 315mVP-P (Typ.); suitable for FM brightness signal output. 3) Auto-tracking interface for automated tracking adjustment. Linear detector characteristic with sensitivity that can be set using external components. 4) The recording amplifier uses constant-current BLT drive that handles load variations (i.e. headimpedance) well, and gives stable recording characteristics. 2 circuits are provided for 4-head VCR use. 5) Built-in recording level AGC means adjustment of FM recording current is not necessary. 6) Head switches for 4-channel PRE / REC system provided. 7) Operates off a single 5V power supply, with low power dissipation.
*Absolute maximum ratings (Ta = 25C)
Parameter Applied voltage Power dissipation Operating temperature Storage temperature Symbol VCC Pd Topr Tstg Limits 7.0 10501 - 20 ~ + 65 - 55 ~ + 125 Unit V mW C C
1 Reduced by 10.5mW for each increase in Ta of 1C over 25C (free air).
*Recommended operating conditions (Ta = 25C)
Parameter Playback / recording Symbol VCC Min. 4.5 Typ. 5.0 Max. 5.5 Unit V Conditions 13pin
Not designed for radiation resistance.
1
Video ICs
BA7184S
*Block diagram
24 AT ENVE FB GND 2 1 2 DET DET 3 4 PRE ENVE 5
PRE
23
EP / SP CTRL
REC LEVEL ADJ
REC AGC FILTER
PB AGC FILTER (REC DCFB 1)
22
AGC
PRE IN 1 (REC - OUT 1)
21
PB AGC OUT
RF
20
REC + OUT 1
PB RF OUT
PEAK
PRE IN 2 (REC - OUT 2)
19
AT ENVE PEAKING
6 7 8
PRE
ENVE
18
GND 1
AT ENVE OUT
PRE IN 3 (REC - OUT 3)
17
H SYNC IN
LOGIC
ENVE
16
REC + OUT 2
DFF IN
9
PRE
COMP
PRE IN 4 (REC - OUT 4)
10 SP AGC REC 11 EP 12
15
ENVE COMP OUT
MUTE
14
REC DCFB 2
REC IN
VCC
13
TP / PB / EE / REC CTRL
VCC
2
Video ICs
BA7184S
*Electrical characteristics (unless otherwise noted, Ta = 25C, VCC = 5.0V and f = 4.0MHz)
Parameter Playback system (Pin 12: H) Supply current Voltage gain ch-1 Voltage gain ch-2 Voltage gain ch-3 Voltage gain ch-4 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 frequency characteristic PB switch ON resistance ENVE residual voltage ENVE output level ENVE saturation voltage PRE ch 2 and 4 holding voltage PRE ch 1 and 3 holding voltage EP mode holding voltage SP mode holding voltage TP mode holding voltage PB mode holdihg voltage EE mode holding voltage REC mode holding voltage Iq (P) GVP1 GVP2 GVP3 GVP4 GVP GVf 2HDP 3HDP VOMP CTP VODC VNIN VAGC VAGC GVAF RON5, 9 VENV1 VENV2 VENV3 VTH16H VTH16L VTH2H VTH2L VTH12T VTH12H VTH12M VTH12L -- 52 52 52 52 - 1.5 -8 -- -- 0.8 -- -- -- 265 -- -8 -- -- 2.4 4.0 3.5 0 3.5 0 4.1 3.0 1.1 0 27 56 56 56 56 -- - 1.7 - 42 - 50 1.2 - 45 -- 0.25 315 0.3 -3 5 0.7 2.9 4.5 -- -- -- -- -- -- -- -- 45 60 60 60 60 + 1.5 -- - 35 - 35 -- - 30 200 1.0 365 2.0 -- 10 1.0 3.4 -- VCC 1.2 VCC 1.2 VCC 3.7 2.6 0.7 mA dB dB dB dB dB dB dBc dBc VP-P dBc mVP-P No signal Pin 4 input = 0.3mVP-P, pin 2: L, pin 16: L, pin 20 output measurement Pin 6 input = 0.3mVP-P, pin 2: L, pin 16: H, pin 20 output measurement Pin 8 input = 0.3mVP-P, pin 2: H, pin 16: L, pin 20 output measurement Pin 10 input = 0.3mVP-P, pin 2: H, pin 16: H, pin 20 output measurement GVP = GVP1 - GVP2, GVP3 - GVP4 Pin 20 output level difference for f = 8.0 / 1.0MHz, VIN = 0.3mVP-P. VIN = 0.3mVP-P, 8.0MHz spurious VIN = 0.3mVP-P, 12.0MHz spurious2 When pin 20 output 2nd harmonic distortion is - 30dBc Pin 20 output level difference for pin 2: H / L, pin 16: H / L. Pin 20 output DC offset for pin 2: H / L, pin 16: H / L. 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 Fig. 1 Fig. 1 Fig. 1 Fig. 1 Fig. 1 Symbol Min. Typ. Max. Unit Conditions Measurement circuit
Vrms Rg = 10, input conversion of pin 20 output noise2 mVP-P dB dB V V V V V V V V V V V VIN = 0.3mVP-P, pin 21 output measurement Pin 21 output level differential for VIN = 0.15 to 0.6mVP-P. f = 8.0 / 1.0MHz, VIN = 0.3mVP-P2 Pin 5 and pin 9 impedance2 Pin 18 output measurement when no signal Pin 18 output measurement when pin 20 output = 400mVP-P Pin 18 output measurement for large signal Pin 16 DC voltage for ch 2 and 4 operation Pin 16 DC voltage for ch 1 and 3 operation Pin 2 DC voltage for EP mode Pin 2 DC voltage for SP mode Pin 12 DC voltage for TRICK PLAY mode Pin 12 DC voltage for PB mode Pin 12 DC voltage for REC MUTE mode Pin 12 DC voltage for REC mode
2 Guaranteed design values. Note: dBc: dB below carrier (used to express relative level from carrier reference for convenience sake)
3
Video ICs
BA7184S
Parameter Recording system (Pin 12: L)
Quiescent current Recording AGC level 1 Recording AGC level 2 AGC control sensitivity AGC 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
Symbol
Min.
Typ.
Max.
Unit
Conditions
Measurement circuit
Iq (R) IOAR1 IOAR2 IOAR IOAF 2HDR 3HDR CMDR IOMR IORL MUR VTH17H VTH17L
-- 27 24 -- -8 -- -- -- 40 - 2.0 -- 2.8 0
67 30 27 0.3 -3 - 45 - 50 - 50 50 - 0.3 - 45 -- --
100 33 30 2.0 -- - 35 - 35 - 35 -- -- - 35 VCC 1.2
mA
No signal
Fig. 2 Fig. 2 Fig. 2 Fig. 2 Fig. 2 Fig. 2 Fig. 2 Fig. 2 Fig. 2 Fig. 2 Fig. 2 Fig. 2 Fig. 2
mAP-P Pin 14 input = 125mVP-P, pin 2: L, pin 5 output measurement mAP-P dB dB dBc dBc dBc Pin 14 input = 125mVP-P, pin 2: H, pin 9 output measurement Pin 14 input = 62.5mVP-P, to 250mVP-P, pin 5 output level differential f = 8.0 / 1.0MHz, pin 14 input = 125mVP-P,2
Pin 14 input = 125mVP-P, 8MHz spurious Pin 14 input = 125mVP-P, 12.0MHz spurious2 4.0MHz 630kHz spurious2
mAP-P When pin 5 output 2nd harmonic distortion is - 30dB dB dBc V V
Pin 5 output level difference when load L: 8.2 and 12H2 Pin 5 output level difference for pin 12: M / L Pin 17 DC voltage to maintain recording AGC operation. Pin 17 DC voltage to maintain recording AGC stopped.
2 Guaranteed design values.
Note: dBc: dB below carrier (used to express relative level from carrier reference for convenience sake)
4
Video ICs
*Measurement circuits (Playback system)
33k 24 1
10k 33k 0.1 22 23 2
EP / SP CTRL
DET
DET
3
PRE IN 1
AGC
1k 0.1
21
4
PB AGC OUT
PRE
10
0.1
20
RF
ENVE
5
PRE
3.9k
22
PB RF OUT
10 6 0.1 1k 7
1k PRE IN 3
19
PRE IN 2
AT ENVE PEAKING 68p 18 AT ENVE OUT
PEAK ENVE
Fig. 1
8
10 0.1
PRE
17 LOGIC 390k 16
ENVE
H SYNC IN
9
PRE
DFF IN 15
10 PRE IN 4 1k 0.1 0.1
10
ENVE COMP OUT SP 0.01
REC AGC
Units: R [] C [F] L [H] REC START ``L'' REC MUTE ``L'' TRICK PLAY ``H'' PB: OPEN
COMP MUTE
11 12
14
REC IN EP 13 VCC
+
VCC 5V
BA7184S
5
(Recording system)
6
33k 24 1 10k 33k 23 REC LEVEL ADJ 0.1 22 DET 2
EP / SP CTRL
Video ICs
DET
3
0.1 8.2
21
AGC
4
PRE
PB AGC OUT
0.1 REC OUT 1 10
20
RF
ENVE
5
PRE
3.9k 22 19
PB RF OUT
0.1
6
PEAK ENVE
Fig. 2
8.2
68p 18
7
AT ENVE OUT
8.2
17
8
PRE
H SYNC IN 390k 16
ENVE
0.1 REC OUT 2 0.1 10
LOGIC
9
PRE
DFF IN 10 15
Units: R [] C [F] L [H]
8.2
ENVE COMP OUT 0.01 SP
REC AGC
COMP MUTE
11 0.1
14
REC IN EP 12 13
REC START ``L'' REC MUTE ``L'' TRICK PLAY ``H'' PB: OPEN
VCC
+ VCC 5V
BA7184S
Video ICs
BA7184S
*ControlINsystem logic table (1) DFF (pin 16)
* Playback input selection (head switching)
Control pin DFF IN L H L H EP / SP H Function Selected playback input Ch3 (PRE IN3 8pin) Ch4 (PRE IN4 10pin) Ch1 (PRE IN1 4pin) L Ch2 (PRE IN2 6pin) Control voltage VCTRL16 [V] 3.5 ~ VCC 0.0 ~ 1.2 -- --
(2) EP / SP control (pin 2) * Recording output selection * Playback input selection (see (1))
Control pin EP / SP H L Function Selected recording output EP (REC OUT 8, 9, 10pin) SP (REC OUT 4, 5, 6pin) Control voltage VCTRL2 [V] 3.5 ~ VCC 0.0 ~ 1.2
(3) TP / PB / EE / REC CTRL (pin 12) * Special playback / playback / recording mute / recording mode switching
Control pin PB / EE / REC OT H M L TRICK PLAY PB REC MUTE REC Mode ON ON OFF OFF ON ON OFF OFF Function PRE AMP AT ENVE ENV COMP REC MUTE REC AMP ON OFF OFF OFF OFF OFF ON OFF OFF OFF ON ON Control voltage VCTRL12 [V] 4.1 ~ VCC 3.0 ~ 3.7 1.1 ~ 2.6 0.0 ~ 0.7
* Pin 12 is biased internally in the IC. When open, PB mode is selected.
(4) H SYNC IN (pin 17) * Special playback envelope comparator (ENVE COMP) output latch control. * AGC operation control for recording.
Control pin H SYNC H L Function ENVE COMP Set at falling edge -- AGC detector ON OFF Control voltage VCTRL17 [V] 2.8 ~ VCC 0.0 ~ 1.2
(5) ENVE COMP OUT (pin 15) * Outputs playback envelope comparator data for special playback.
Control pin ENVE COMP H L Function Playback input level Ch1 or Ch2 > Ch3 or Ch4 Ch1 or Ch2 < Ch3 or Ch4
7
Video ICs
BA7184S
*Application example
REC LEVEL ADJ H SYNC IN ENVE COMP OUT
REC Y IN
AT ENVE OUT
PB AGC OUT
PB RF OUT
REC C IN
AT ENVE PEAKING
DFF IN
VCC 5V
0.1
390k
3.9k
24
23
22
21
20
19
18
17
16
15
0.01
33k
22
68p
+
14
13
DET AGC RF
PEAK
ENVE
LOGIC
COMP
MUTE
VCC
REC
AGC ENVE
ENVE
SP
EP
PRE DET
PRE
PRE
PRE
1 33k
2
3
4
5
6
7
8
9
10
11
12
0.1
0.1
0.1
0.1
EP / SP CTRL
0.1
AT ENVE GAIN EP ``H''
33k
10k
0.1 REC MUTE ``L''
TRICK PLAY ``H''
REC START ``L''
A B SP HEAD
A B EP HEAD
Fig. 3
Units: R [] C [F] L [H]
*
External dimensions (Units: mm)
22.9 0.3 24 13 6.5 0.3
0.51Min.
1
12
3.4 0.2 3.95 0.3
7.62
0.3 0.1
1.778
0.5 0.1
0
~ 15
SDIP24
8
PB: OPEN

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