Outline; Large Scale Employment Of Bus Control Of Parameter For Picture Controls; Employment Of Containing Each Video Band Filter Inside; Employment Of Containing Each Filter (For S/H) Inside - Toshiba CN27E90 Technical Training Manual

1. OUTLINE

This IC enables more precise picture setting than that of former IC (TA8845N) by means of large scale employment
of IIC bus, and reduces many peripheral components by containing filters inside.
The main features (comparing TA8845) are as follows.
2. LARGE SCALE EMPLOYMENT OF BUS CONTROL OF PARAMETER FOR PICTURE
CONTROLS
(Soft method of picture making)
* Black expanding start point
* DC transmission correction quantity point
* Black level correction quantity
* Each ABCL characteristic

3. EMPLOYMENT OF CONTAINING EACH VIDEO BAND FILTER INSIDE

(Employment of automatic adjustment circuit by Fsc to absorb deviation
/ Employment of deviation aborbing method by high S/N filter and mask triming using fixed CR)
* Y-DL
* Chroma TOF/BPF
*Velocity modulation processing circuit
* Fsc trap for chroma demodulation output

4. EMPLOYMENT OF CONTAINING EACH FILTER (FOR S/H) INSIDE

(Circuit operation by extremely low current
/ Employment of leak current cancel circuit
/ Employment of detection circuit which does not suffer from influence of stray capacity)
* Chroma ACC / killer filter
* Y / color difference clamp filter
* Filter for filter automatic adjustment
* AFC 2 filter

5. LOW COST OF IC

* Involving peripheral components inside ——> Down sizing of chip ——> Newly employment (NPN Tr area
ratio to former : -25%) of miniature process (PLAS-1 S process)
* Involving peripheral components inside——>Increasing of power consumption——>2 power supply system
(5V / 9V used)
* Involving peripheral components inside ——> Reducing of number of elements ——> Employment of new
circuit
(1) Reducing of gate (change of preset method) of register for IIC decoder
(2) Reducing of DAC elements (employment of rudder type DAC + temperature compensation circuit)
(3) Deletion of chroma CW, ACC (employment of 90 degree shift phase circuit with automatic adjustment)
(Former/TA8845N)
External constant
External constant
External constant
External constant
(Former/TA8845N)
Apa-con DL inside
External
External
External
(Former/TA8845N)
External
External
External
External
53
TA1222N
BUS control
BUS control
BUS control
BUS control
TA1222N
Inside
Inside
Inside
Inside
TA1222N
Inside
Inside
Inside
Inside