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參數(shù)資料
| 型號： | BU2890 |
| 英文描述： | Capstan/Servo Circuit For VCR |
| 中文描述： | 絞盤/伺服電路錄像機 |
| 文件頁數(shù)： | 1/5頁 |
| 文件大小： | 54K |
| 代理商： | BU2890 |
1
Video ICs
Digital servo controller for VCRs
BU2890 series
The BU2890 series are LSI linear digital-servo controllers that allows construction of a VCR servo system using one
IC. The package is a SDIP 42 pin.
The circuit provides linear input signal wave-shaping, and has a servo function for output of the speed and phase
control for the drum and capstan. In addition, it generates a quasi-V pulse for special playback, and has a recording
mode auto-discrimination function, an FM audio head switch signal generator for Hi-Fi systems, and is compatible
with VISS / VASS operation. It can also steplessly vary capstan speed during FF / REW. It also has a mixing amplifi-
er and CTL amplifier for linear signal wave-shaping, so external linear circuits are not required.
Applications
VCRs
Features
1) All VCR servo functions on a single chip.
2) Built-in CTL and mixing amplifiers with AGC.
3) Built-in wave-shaping circuit for the DFG, DPG and
CFG signals.
4) Mode setting via two-line serial data transfer with
parity checking.
5) Built-in digital gain-compensation circuit for the cap-
stan system.
6) VISS / VASS compatible with CTL overwrite for play-
back and VISS code discrimination.
7) Microprocessor control for stepless capstan speed
control during FF and REW.
8) Special constant-voltage diode for playback head
switching logic.
Recommended operating conditions (Ta = 25°C)
Parameter
Symbol
Limits
Unit
V
DD
4.5 ~ 5.5
V
Power supply voltage
Absolute maximum ratings (Ta = 25°C)
Parameter
Symbol
Limits
Unit
V
DD
7
V
mW
°
C
°
C
V
IN
V
500
Tstg
Topr
Pd
– 15 ~ + 70
– 55 ~ + 125
V
SS
– 0.3 ~ V
DD
+ 0.3
Reduced by 5mW for each increase in Ta of 1
°
C over 25
°
C.
Power supply voltage
Power dissipation
Operating temperature
Storage temperature
Pin applied voltage
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