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Part Number: BU2890
Description: The BU2890 series are LSI linear digital-servo controllers that allows construction of a VCR servo sys...
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BU2890
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Suppliers
DataSheet
General Description
BU2890 General Description
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 amplifier
and CTL amplifier for linear signal wave-shaping, so external linear circuits are not required.
BU2890 Maximum Ratings
|
Parameter |
Symbol |
Limits |
Unit |
| Power supply voltage |
VDD |
7 |
V |
| Power dissipation |
Pd |
500* |
mW |
| Operating temperature |
Topr |
15 ~ + 70 |
|
| Storage temperature |
Tstg |
55 ~ + 125 |
|
| Pin applied voltage |
VIN |
VSS 0.3 ~ VDD + 0.3 |
V |
* Reduced by 5mW for each increase in Ta of 1over 25.
BU2890 Features
· All VCR servo functions on a single chip.
· Built-in CTL and mixing amplifiers with AGC.
· Built-in wave-shaping circuit for the DFG, DPG and CFG signals.
· Mode setting via two-line serial data transfer with parity checking.
· Built-in digital gain-compensation circuit for the capstan system.
· VISS / VASS compatible with CTL overwrite for playback and VISS code discrimination.
· Microprocessor control for stepless capstan speed control during FF and REW.
· Special constant-voltage diode for playback head switching logic.
· Built-in CTL and mixing amplifiers with AGC.
· Built-in wave-shaping circuit for the DFG, DPG and CFG signals.
· Mode setting via two-line serial data transfer with parity checking.
· Built-in digital gain-compensation circuit for the capstan system.
· VISS / VASS compatible with CTL overwrite for playback and VISS code discrimination.
· Microprocessor control for stepless capstan speed control during FF and REW.
· Special constant-voltage diode for playback head switching logic.
BU2890 Typical Application
·VCRs
BU2890 series
PDF/DataSheet Download
- Datasheet: BU2890 series
- File Size: 56543 KB
- Manufacturer: ROHM
- Click here to Download
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