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TB1240BN, TB1245N, TB1251

Table of contents:
Info of TB1240BN
Info of TB1245N
Info of TB1251

TB1240BN, TB1245N, TB1251 Selling Leads, Datasheet

MFG:TOSHIBA Package Cooled:DIP56 D/C:04+

TB1240BN, TB1245N, TB1251 Datasheet download

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Part Number: TB1240BN

MFG: TOSHIBA

Package Cooled: DIP56

D/C: 04+

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TB1245N General Description

TB1245N that is a signal processing IC for the PAL / NTSC / SECAM color TV system integrates video, chroma and synchronizing signal processing circuits together in a 56pin shrink DIP plastic package.

TB1245N incorporates a high performance picture quality compensation circuit in the video section, an automatic PAL / NTSC / SECAM discrimination circuit in the chroma section, and an automatic 50 / 60 Hz discrimination circuit in the synchronizing section. Besides a crystal oscillator that internally generates 4.43 MHz, 3.58 MHz and M / N-PAL clock signals for color demodulation, there is a horizontal PLL circuit built in the IC.
The PAL / SECAM demodulation circuit which is an adjustment-free circuit incorporates a 1H DL circuit inside for operating the base band signal processing system.

Also, TB1245N makes it possible to set or control various functions through the built-in I²C bus line.

TB1245N Maximum Ratings

CHARACTERISTIC	SYMBOL	RATING	UNIT
Supply Voltage	V_CCMAX	12	V
Permissible Loss	P_DMAX	2190 (Note 1)	mW
Power Consumption Declining Degree	1 / Qja	17.52	mW /
Input Terminal Voltage	V_in	GND − 0.3~V_CC + 0.3	V
Input Signal Voltage	e_in	7	Vp-p
Operating Temperature	T_opr	−20~65
Conserving Temperature	T_stg	−55~150

Note 1: In the condition that IC is actually mounted. See the diagram below.
Note 2: This IC is not proof enough against a strong E-M field by CRT which may cause function errors and / or poor
characteristics.

Keeping the distance from CRT to the IC longer than 20 cm, or if cannot, placing shield metal over the IC, is
recommended in an application.

TB1245N Features

` Video section
` Built-in trap filter
` Black expansion circuit
` Variable DC regeneration rate
` Y delay line
` Sharpness control by aperture control
` correction
` Chroma section
` Built-in 1 H Delay circuit
` PAL base band demodulation
` One crystal color demodulation circuit
` Automatic system discrimination
` Built-in band-pass filter
` Color limiter circuit
` Synchronizing deflecting section
` Built-in horizontal VCO resonator
` Adjustment-free horizontal / vertical oscillation By count-down circuit
` Double AFC circuit
` Vertical frequency automatic discrimination circuit
` Horizontal / vertical holding adjustment
` Vertical ramp output
` Vertical amplitude adjustment
` Vertical linearity / S-shaped curve adjustment
` E / W output
` Text section
` Linear RGB input
` OSD RGB input
` Cut / off-drive adjustment
` RGB primary signal output

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