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부품번호 | BA7180AFS 기능 |
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기능 | 2-channel PRE / REC amplifier with auto-tracking interface | ||
제조업체 | ROHM Semiconductor | ||
로고 | |||
전체 12 페이지수
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
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 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 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 = 25°C)
Parameter
Symbol
Limits
Unit
Power supply voltage
BA7180AS
Power dissipation
BA7180AFS
VCC
Pd
7.0
1000∗1
937.5∗2
V
mW
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
Symbol Min. Typ.
Playback / recording
VCC 4.5 5.0
Max.
5.5
Unit
V
1
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
Iq (R) — 72 110 mA No signal
IOAR
27
30
33
mAP-P
Pin 13 input = 125mVP-P, pin 9
output measurement
∆IOAR
—
0.3
1.5
dB
Pin 9 output level difference for pin 13
input = 62.5mVP-P ~ 250mVP-P
∆IOAF – 4 – 1.5
—
dB
Pin 9 output level difference for f = 8.0 / 1.0MHz,
pin 12 input = 125mVP-P, guaranteed design value.
2HDR — – 45 – 38 dBc Pin 13 input = 125mVP-P 8MHz spurious
3HDR
— – 50 – 40
dBc
Pin 13 input = 125mVP-P 12MHz spurious,
guaranteed design value.
Fig.2
Fig.2
Fig.2
Fig.2
Fig.2
Fig.2
Cross modulation distortion
CMDR — – 50 – 40 dBc 4.0MHz ± 630kHz spurious, guaranteed design value. Fig.2
Maximum output level
Recording current load
characteristic
IOMR 40 50
∆I ORL – 1.5 – 0.35
— mAP-P When pin 9 output 2nd harmonic distortion is -30dB
—
dB
Pin 9 output level difference for load L: 8.2
~ 12µH, guaranteed design value.
Fig.2
Fig.2
Mute attenuation ratio
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
AGC mode holding voltage
VTH15L 0 — 1.2 V Pin 17 DC voltage to maintain recording AGC stopped
Note:
dBc: dB below carrier (used to express relative level from carrier reference for convenience sake)
Fig.2
Fig.2
•Reference values (unless otherwise noted, Ta = 25°C, VCC = 4.8V and f = 4.0MHz)
Parameter
Symbol Min. Typ. Max. Unit
Conditions (BA7180AS)
ENVE output level
ENVE output level
VENV2' 1.8 2.3 2.8
VENV3' 3.35 3.6 3.85
V
Pin 15 output measurement when
pin 16 output = 100mVP-P.
V
Pin 15 output measurement when
pin 16 output = 400mVP-P.
4
4페이지 Video ICs
BA7180AFS (playback system)
BA7180AS / BA7180AFS
+
20 19 18 17 16 15 14 13 12 11
AGC
DET
HPF
RF
DET
HPF
MUTE
REC
VCC
–
PRE
PRE
–
AGC
PRE / REC
+
LOGIC
DET
1 2 3 4 5 6 7 8 9 10
Fig.3
Units: R [Ω]
C [F]
L [H]
7
7페이지 | |||
구 성 | 총 12 페이지수 | ||
다운로드 | [ BA7180AFS.PDF 데이터시트 ] |
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구매 문의 | 일반 IC 문의 : 샘플 및 소량 구매 ----------------------------------------------------------------------- IGBT, TR 모듈, SCR 및 다이오드 모듈을 포함한 광범위한 전력 반도체를 판매합니다. 전력 반도체 전문업체 상호 : 아이지 인터내셔날 사이트 방문 : [ 홈페이지 ] [ 블로그 1 ] [ 블로그 2 ] |
부품번호 | 상세설명 및 기능 | 제조사 |
BA7180AFS | 2-channel PRE / REC amplifier with auto-tracking interface | ROHM Semiconductor |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |